Initial import

1 files changed, 1548 insertions, 0 deletions

diff --git a/net/netlabel/netlabel_unlabeled.c b/net/netlabel/netlabel_unlabeled.c
new file mode 100644
index 000000000..b0380927f
--- /dev/null
+++ b/net/netlabel/netlabel_unlabeled.c
@@ -0,0 +1,1548 @@
+/*
+ * NetLabel Unlabeled Support
+ *
+ * This file defines functions for dealing with unlabeled packets for the
+ * NetLabel system.  The NetLabel system manages static and dynamic label
+ * mappings for network protocols such as CIPSO and RIPSO.
+ *
+ * Author: Paul Moore <paul@paul-moore.com>
+ *
+ */
+
+/*
+ * (c) Copyright Hewlett-Packard Development Company, L.P., 2006 - 2008
+ *
+ * This program is free software;  you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY;  without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
+ * the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program;  if not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include <linux/types.h>
+#include <linux/rcupdate.h>
+#include <linux/list.h>
+#include <linux/spinlock.h>
+#include <linux/socket.h>
+#include <linux/string.h>
+#include <linux/skbuff.h>
+#include <linux/audit.h>
+#include <linux/in.h>
+#include <linux/in6.h>
+#include <linux/ip.h>
+#include <linux/ipv6.h>
+#include <linux/notifier.h>
+#include <linux/netdevice.h>
+#include <linux/security.h>
+#include <linux/slab.h>
+#include <net/sock.h>
+#include <net/netlink.h>
+#include <net/genetlink.h>
+#include <net/ip.h>
+#include <net/ipv6.h>
+#include <net/net_namespace.h>
+#include <net/netlabel.h>
+#include <asm/bug.h>
+#include <linux/atomic.h>
+
+#include "netlabel_user.h"
+#include "netlabel_addrlist.h"
+#include "netlabel_domainhash.h"
+#include "netlabel_unlabeled.h"
+#include "netlabel_mgmt.h"
+
+/* NOTE: at present we always use init's network namespace since we don't
+ *       presently support different namespaces even though the majority of
+ *       the functions in this file are "namespace safe" */
+
+/* The unlabeled connection hash table which we use to map network interfaces
+ * and addresses of unlabeled packets to a user specified secid value for the
+ * LSM.  The hash table is used to lookup the network interface entry
+ * (struct netlbl_unlhsh_iface) and then the interface entry is used to
+ * lookup an IP address match from an ordered list.  If a network interface
+ * match can not be found in the hash table then the default entry
+ * (netlbl_unlhsh_def) is used.  The IP address entry list
+ * (struct netlbl_unlhsh_addr) is ordered such that the entries with a
+ * larger netmask come first.
+ */
+struct netlbl_unlhsh_tbl {
+	struct list_head *tbl;
+	u32 size;
+};
+#define netlbl_unlhsh_addr4_entry(iter) \
+	container_of(iter, struct netlbl_unlhsh_addr4, list)
+struct netlbl_unlhsh_addr4 {
+	u32 secid;
+
+	struct netlbl_af4list list;
+	struct rcu_head rcu;
+};
+#define netlbl_unlhsh_addr6_entry(iter) \
+	container_of(iter, struct netlbl_unlhsh_addr6, list)
+struct netlbl_unlhsh_addr6 {
+	u32 secid;
+
+	struct netlbl_af6list list;
+	struct rcu_head rcu;
+};
+struct netlbl_unlhsh_iface {
+	int ifindex;
+	struct list_head addr4_list;
+	struct list_head addr6_list;
+
+	u32 valid;
+	struct list_head list;
+	struct rcu_head rcu;
+};
+
+/* Argument struct for netlbl_unlhsh_walk() */
+struct netlbl_unlhsh_walk_arg {
+	struct netlink_callback *nl_cb;
+	struct sk_buff *skb;
+	u32 seq;
+};
+
+/* Unlabeled connection hash table */
+/* updates should be so rare that having one spinlock for the entire
+ * hash table should be okay */
+static DEFINE_SPINLOCK(netlbl_unlhsh_lock);
+#define netlbl_unlhsh_rcu_deref(p) \
+	rcu_dereference_check(p, lockdep_is_held(&netlbl_unlhsh_lock))
+static struct netlbl_unlhsh_tbl *netlbl_unlhsh = NULL;
+static struct netlbl_unlhsh_iface *netlbl_unlhsh_def = NULL;
+
+/* Accept unlabeled packets flag */
+static u8 netlabel_unlabel_acceptflg = 0;
+
+/* NetLabel Generic NETLINK unlabeled family */
+static struct genl_family netlbl_unlabel_gnl_family = {
+	.id = GENL_ID_GENERATE,
+	.hdrsize = 0,
+	.name = NETLBL_NLTYPE_UNLABELED_NAME,
+	.version = NETLBL_PROTO_VERSION,
+	.maxattr = NLBL_UNLABEL_A_MAX,
+};
+
+/* NetLabel Netlink attribute policy */
+static const struct nla_policy netlbl_unlabel_genl_policy[NLBL_UNLABEL_A_MAX + 1] = {
+	[NLBL_UNLABEL_A_ACPTFLG] = { .type = NLA_U8 },
+	[NLBL_UNLABEL_A_IPV6ADDR] = { .type = NLA_BINARY,
+				      .len = sizeof(struct in6_addr) },
+	[NLBL_UNLABEL_A_IPV6MASK] = { .type = NLA_BINARY,
+				      .len = sizeof(struct in6_addr) },
+	[NLBL_UNLABEL_A_IPV4ADDR] = { .type = NLA_BINARY,
+				      .len = sizeof(struct in_addr) },
+	[NLBL_UNLABEL_A_IPV4MASK] = { .type = NLA_BINARY,
+				      .len = sizeof(struct in_addr) },
+	[NLBL_UNLABEL_A_IFACE] = { .type = NLA_NUL_STRING,
+				   .len = IFNAMSIZ - 1 },
+	[NLBL_UNLABEL_A_SECCTX] = { .type = NLA_BINARY }
+};
+
+/*
+ * Unlabeled Connection Hash Table Functions
+ */
+
+/**
+ * netlbl_unlhsh_free_iface - Frees an interface entry from the hash table
+ * @entry: the entry's RCU field
+ *
+ * Description:
+ * This function is designed to be used as a callback to the call_rcu()
+ * function so that memory allocated to a hash table interface entry can be
+ * released safely.  It is important to note that this function does not free
+ * the IPv4 and IPv6 address lists contained as part of an interface entry.  It
+ * is up to the rest of the code to make sure an interface entry is only freed
+ * once it's address lists are empty.
+ *
+ */
+static void netlbl_unlhsh_free_iface(struct rcu_head *entry)
+{
+	struct netlbl_unlhsh_iface *iface;
+	struct netlbl_af4list *iter4;
+	struct netlbl_af4list *tmp4;
+#if IS_ENABLED(CONFIG_IPV6)
+	struct netlbl_af6list *iter6;
+	struct netlbl_af6list *tmp6;
+#endif /* IPv6 */
+
+	iface = container_of(entry, struct netlbl_unlhsh_iface, rcu);
+
+	/* no need for locks here since we are the only one with access to this
+	 * structure */
+
+	netlbl_af4list_foreach_safe(iter4, tmp4, &iface->addr4_list) {
+		netlbl_af4list_remove_entry(iter4);
+		kfree(netlbl_unlhsh_addr4_entry(iter4));
+	}
+#if IS_ENABLED(CONFIG_IPV6)
+	netlbl_af6list_foreach_safe(iter6, tmp6, &iface->addr6_list) {
+		netlbl_af6list_remove_entry(iter6);
+		kfree(netlbl_unlhsh_addr6_entry(iter6));
+	}
+#endif /* IPv6 */
+	kfree(iface);
+}
+
+/**
+ * netlbl_unlhsh_hash - Hashing function for the hash table
+ * @ifindex: the network interface/device to hash
+ *
+ * Description:
+ * This is the hashing function for the unlabeled hash table, it returns the
+ * bucket number for the given device/interface.  The caller is responsible for
+ * ensuring that the hash table is protected with either a RCU read lock or
+ * the hash table lock.
+ *
+ */
+static u32 netlbl_unlhsh_hash(int ifindex)
+{
+	return ifindex & (netlbl_unlhsh_rcu_deref(netlbl_unlhsh)->size - 1);
+}
+
+/**
+ * netlbl_unlhsh_search_iface - Search for a matching interface entry
+ * @ifindex: the network interface
+ *
+ * Description:
+ * Searches the unlabeled connection hash table and returns a pointer to the
+ * interface entry which matches @ifindex, otherwise NULL is returned.  The
+ * caller is responsible for ensuring that the hash table is protected with
+ * either a RCU read lock or the hash table lock.
+ *
+ */
+static struct netlbl_unlhsh_iface *netlbl_unlhsh_search_iface(int ifindex)
+{
+	u32 bkt;
+	struct list_head *bkt_list;
+	struct netlbl_unlhsh_iface *iter;
+
+	bkt = netlbl_unlhsh_hash(ifindex);
+	bkt_list = &netlbl_unlhsh_rcu_deref(netlbl_unlhsh)->tbl[bkt];
+	list_for_each_entry_rcu(iter, bkt_list, list)
+		if (iter->valid && iter->ifindex == ifindex)
+			return iter;
+
+	return NULL;
+}
+
+/**
+ * netlbl_unlhsh_add_addr4 - Add a new IPv4 address entry to the hash table
+ * @iface: the associated interface entry
+ * @addr: IPv4 address in network byte order
+ * @mask: IPv4 address mask in network byte order
+ * @secid: LSM secid value for entry
+ *
+ * Description:
+ * Add a new address entry into the unlabeled connection hash table using the
+ * interface entry specified by @iface.  On success zero is returned, otherwise
+ * a negative value is returned.
+ *
+ */
+static int netlbl_unlhsh_add_addr4(struct netlbl_unlhsh_iface *iface,
+				   const struct in_addr *addr,
+				   const struct in_addr *mask,
+				   u32 secid)
+{
+	int ret_val;
+	struct netlbl_unlhsh_addr4 *entry;
+
+	entry = kzalloc(sizeof(*entry), GFP_ATOMIC);
+	if (entry == NULL)
+		return -ENOMEM;
+
+	entry->list.addr = addr->s_addr & mask->s_addr;
+	entry->list.mask = mask->s_addr;
+	entry->list.valid = 1;
+	entry->secid = secid;
+
+	spin_lock(&netlbl_unlhsh_lock);
+	ret_val = netlbl_af4list_add(&entry->list, &iface->addr4_list);
+	spin_unlock(&netlbl_unlhsh_lock);
+
+	if (ret_val != 0)
+		kfree(entry);
+	return ret_val;
+}
+
+#if IS_ENABLED(CONFIG_IPV6)
+/**
+ * netlbl_unlhsh_add_addr6 - Add a new IPv6 address entry to the hash table
+ * @iface: the associated interface entry
+ * @addr: IPv6 address in network byte order
+ * @mask: IPv6 address mask in network byte order
+ * @secid: LSM secid value for entry
+ *
+ * Description:
+ * Add a new address entry into the unlabeled connection hash table using the
+ * interface entry specified by @iface.  On success zero is returned, otherwise
+ * a negative value is returned.
+ *
+ */
+static int netlbl_unlhsh_add_addr6(struct netlbl_unlhsh_iface *iface,
+				   const struct in6_addr *addr,
+				   const struct in6_addr *mask,
+				   u32 secid)
+{
+	int ret_val;
+	struct netlbl_unlhsh_addr6 *entry;
+
+	entry = kzalloc(sizeof(*entry), GFP_ATOMIC);
+	if (entry == NULL)
+		return -ENOMEM;
+
+	entry->list.addr = *addr;
+	entry->list.addr.s6_addr32[0] &= mask->s6_addr32[0];
+	entry->list.addr.s6_addr32[1] &= mask->s6_addr32[1];
+	entry->list.addr.s6_addr32[2] &= mask->s6_addr32[2];
+	entry->list.addr.s6_addr32[3] &= mask->s6_addr32[3];
+	entry->list.mask = *mask;
+	entry->list.valid = 1;
+	entry->secid = secid;
+
+	spin_lock(&netlbl_unlhsh_lock);
+	ret_val = netlbl_af6list_add(&entry->list, &iface->addr6_list);
+	spin_unlock(&netlbl_unlhsh_lock);
+
+	if (ret_val != 0)
+		kfree(entry);
+	return 0;
+}
+#endif /* IPv6 */
+
+/**
+ * netlbl_unlhsh_add_iface - Adds a new interface entry to the hash table
+ * @ifindex: network interface
+ *
+ * Description:
+ * Add a new, empty, interface entry into the unlabeled connection hash table.
+ * On success a pointer to the new interface entry is returned, on failure NULL
+ * is returned.
+ *
+ */
+static struct netlbl_unlhsh_iface *netlbl_unlhsh_add_iface(int ifindex)
+{
+	u32 bkt;
+	struct netlbl_unlhsh_iface *iface;
+
+	iface = kzalloc(sizeof(*iface), GFP_ATOMIC);
+	if (iface == NULL)
+		return NULL;
+
+	iface->ifindex = ifindex;
+	INIT_LIST_HEAD(&iface->addr4_list);
+	INIT_LIST_HEAD(&iface->addr6_list);
+	iface->valid = 1;
+
+	spin_lock(&netlbl_unlhsh_lock);
+	if (ifindex > 0) {
+		bkt = netlbl_unlhsh_hash(ifindex);
+		if (netlbl_unlhsh_search_iface(ifindex) != NULL)
+			goto add_iface_failure;
+		list_add_tail_rcu(&iface->list,
+			     &netlbl_unlhsh_rcu_deref(netlbl_unlhsh)->tbl[bkt]);
+	} else {
+		INIT_LIST_HEAD(&iface->list);
+		if (netlbl_unlhsh_rcu_deref(netlbl_unlhsh_def) != NULL)
+			goto add_iface_failure;
+		rcu_assign_pointer(netlbl_unlhsh_def, iface);
+	}
+	spin_unlock(&netlbl_unlhsh_lock);
+
+	return iface;
+
+add_iface_failure:
+	spin_unlock(&netlbl_unlhsh_lock);
+	kfree(iface);
+	return NULL;
+}
+
+/**
+ * netlbl_unlhsh_add - Adds a new entry to the unlabeled connection hash table
+ * @net: network namespace
+ * @dev_name: interface name
+ * @addr: IP address in network byte order
+ * @mask: address mask in network byte order
+ * @addr_len: length of address/mask (4 for IPv4, 16 for IPv6)
+ * @secid: LSM secid value for the entry
+ * @audit_info: NetLabel audit information
+ *
+ * Description:
+ * Adds a new entry to the unlabeled connection hash table.  Returns zero on
+ * success, negative values on failure.
+ *
+ */
+int netlbl_unlhsh_add(struct net *net,
+		      const char *dev_name,
+		      const void *addr,
+		      const void *mask,
+		      u32 addr_len,
+		      u32 secid,
+		      struct netlbl_audit *audit_info)
+{
+	int ret_val;
+	int ifindex;
+	struct net_device *dev;
+	struct netlbl_unlhsh_iface *iface;
+	struct audit_buffer *audit_buf = NULL;
+	char *secctx = NULL;
+	u32 secctx_len;
+
+	if (addr_len != sizeof(struct in_addr) &&
+	    addr_len != sizeof(struct in6_addr))
+		return -EINVAL;
+
+	rcu_read_lock();
+	if (dev_name != NULL) {
+		dev = dev_get_by_name_rcu(net, dev_name);
+		if (dev == NULL) {
+			ret_val = -ENODEV;
+			goto unlhsh_add_return;
+		}
+		ifindex = dev->ifindex;
+		iface = netlbl_unlhsh_search_iface(ifindex);
+	} else {
+		ifindex = 0;
+		iface = rcu_dereference(netlbl_unlhsh_def);
+	}
+	if (iface == NULL) {
+		iface = netlbl_unlhsh_add_iface(ifindex);
+		if (iface == NULL) {
+			ret_val = -ENOMEM;
+			goto unlhsh_add_return;
+		}
+	}
+	audit_buf = netlbl_audit_start_common(AUDIT_MAC_UNLBL_STCADD,
+					      audit_info);
+	switch (addr_len) {
+	case sizeof(struct in_addr): {
+		const struct in_addr *addr4 = addr;
+		const struct in_addr *mask4 = mask;
+
+		ret_val = netlbl_unlhsh_add_addr4(iface, addr4, mask4, secid);
+		if (audit_buf != NULL)
+			netlbl_af4list_audit_addr(audit_buf, 1,
+						  dev_name,
+						  addr4->s_addr,
+						  mask4->s_addr);
+		break;
+	}
+#if IS_ENABLED(CONFIG_IPV6)
+	case sizeof(struct in6_addr): {
+		const struct in6_addr *addr6 = addr;
+		const struct in6_addr *mask6 = mask;
+
+		ret_val = netlbl_unlhsh_add_addr6(iface, addr6, mask6, secid);
+		if (audit_buf != NULL)
+			netlbl_af6list_audit_addr(audit_buf, 1,
+						  dev_name,
+						  addr6, mask6);
+		break;
+	}
+#endif /* IPv6 */
+	default:
+		ret_val = -EINVAL;
+	}
+	if (ret_val == 0)
+		atomic_inc(&netlabel_mgmt_protocount);
+
+unlhsh_add_return:
+	rcu_read_unlock();
+	if (audit_buf != NULL) {
+		if (security_secid_to_secctx(secid,
+					     &secctx,
+					     &secctx_len) == 0) {
+			audit_log_format(audit_buf, " sec_obj=%s", secctx);
+			security_release_secctx(secctx, secctx_len);
+		}
+		audit_log_format(audit_buf, " res=%u", ret_val == 0 ? 1 : 0);
+		audit_log_end(audit_buf);
+	}
+	return ret_val;
+}
+
+/**
+ * netlbl_unlhsh_remove_addr4 - Remove an IPv4 address entry
+ * @net: network namespace
+ * @iface: interface entry
+ * @addr: IP address
+ * @mask: IP address mask
+ * @audit_info: NetLabel audit information
+ *
+ * Description:
+ * Remove an IP address entry from the unlabeled connection hash table.
+ * Returns zero on success, negative values on failure.
+ *
+ */
+static int netlbl_unlhsh_remove_addr4(struct net *net,
+				      struct netlbl_unlhsh_iface *iface,
+				      const struct in_addr *addr,
+				      const struct in_addr *mask,
+				      struct netlbl_audit *audit_info)
+{
+	struct netlbl_af4list *list_entry;
+	struct netlbl_unlhsh_addr4 *entry;
+	struct audit_buffer *audit_buf;
+	struct net_device *dev;
+	char *secctx;
+	u32 secctx_len;
+
+	spin_lock(&netlbl_unlhsh_lock);
+	list_entry = netlbl_af4list_remove(addr->s_addr, mask->s_addr,
+					   &iface->addr4_list);
+	spin_unlock(&netlbl_unlhsh_lock);
+	if (list_entry != NULL)
+		entry = netlbl_unlhsh_addr4_entry(list_entry);
+	else
+		entry = NULL;
+
+	audit_buf = netlbl_audit_start_common(AUDIT_MAC_UNLBL_STCDEL,
+					      audit_info);
+	if (audit_buf != NULL) {
+		dev = dev_get_by_index(net, iface->ifindex);
+		netlbl_af4list_audit_addr(audit_buf, 1,
+					  (dev != NULL ? dev->name : NULL),
+					  addr->s_addr, mask->s_addr);
+		if (dev != NULL)
+			dev_put(dev);
+		if (entry != NULL &&
+		    security_secid_to_secctx(entry->secid,
+					     &secctx, &secctx_len) == 0) {
+			audit_log_format(audit_buf, " sec_obj=%s", secctx);
+			security_release_secctx(secctx, secctx_len);
+		}
+		audit_log_format(audit_buf, " res=%u", entry != NULL ? 1 : 0);
+		audit_log_end(audit_buf);
+	}
+
+	if (entry == NULL)
+		return -ENOENT;
+
+	kfree_rcu(entry, rcu);
+	return 0;
+}
+
+#if IS_ENABLED(CONFIG_IPV6)
+/**
+ * netlbl_unlhsh_remove_addr6 - Remove an IPv6 address entry
+ * @net: network namespace
+ * @iface: interface entry
+ * @addr: IP address
+ * @mask: IP address mask
+ * @audit_info: NetLabel audit information
+ *
+ * Description:
+ * Remove an IP address entry from the unlabeled connection hash table.
+ * Returns zero on success, negative values on failure.
+ *
+ */
+static int netlbl_unlhsh_remove_addr6(struct net *net,
+				      struct netlbl_unlhsh_iface *iface,
+				      const struct in6_addr *addr,
+				      const struct in6_addr *mask,
+				      struct netlbl_audit *audit_info)
+{
+	struct netlbl_af6list *list_entry;
+	struct netlbl_unlhsh_addr6 *entry;
+	struct audit_buffer *audit_buf;
+	struct net_device *dev;
+	char *secctx;
+	u32 secctx_len;
+
+	spin_lock(&netlbl_unlhsh_lock);
+	list_entry = netlbl_af6list_remove(addr, mask, &iface->addr6_list);
+	spin_unlock(&netlbl_unlhsh_lock);
+	if (list_entry != NULL)
+		entry = netlbl_unlhsh_addr6_entry(list_entry);
+	else
+		entry = NULL;
+
+	audit_buf = netlbl_audit_start_common(AUDIT_MAC_UNLBL_STCDEL,
+					      audit_info);
+	if (audit_buf != NULL) {
+		dev = dev_get_by_index(net, iface->ifindex);
+		netlbl_af6list_audit_addr(audit_buf, 1,
+					  (dev != NULL ? dev->name : NULL),
+					  addr, mask);
+		if (dev != NULL)
+			dev_put(dev);
+		if (entry != NULL &&
+		    security_secid_to_secctx(entry->secid,
+					     &secctx, &secctx_len) == 0) {
+			audit_log_format(audit_buf, " sec_obj=%s", secctx);
+			security_release_secctx(secctx, secctx_len);
+		}
+		audit_log_format(audit_buf, " res=%u", entry != NULL ? 1 : 0);
+		audit_log_end(audit_buf);
+	}
+
+	if (entry == NULL)
+		return -ENOENT;
+
+	kfree_rcu(entry, rcu);
+	return 0;
+}
+#endif /* IPv6 */
+
+/**
+ * netlbl_unlhsh_condremove_iface - Remove an interface entry
+ * @iface: the interface entry
+ *
+ * Description:
+ * Remove an interface entry from the unlabeled connection hash table if it is
+ * empty.  An interface entry is considered to be empty if there are no
+ * address entries assigned to it.
+ *
+ */
+static void netlbl_unlhsh_condremove_iface(struct netlbl_unlhsh_iface *iface)
+{
+	struct netlbl_af4list *iter4;
+#if IS_ENABLED(CONFIG_IPV6)
+	struct netlbl_af6list *iter6;
+#endif /* IPv6 */
+
+	spin_lock(&netlbl_unlhsh_lock);
+	netlbl_af4list_foreach_rcu(iter4, &iface->addr4_list)
+		goto unlhsh_condremove_failure;
+#if IS_ENABLED(CONFIG_IPV6)
+	netlbl_af6list_foreach_rcu(iter6, &iface->addr6_list)
+		goto unlhsh_condremove_failure;
+#endif /* IPv6 */
+	iface->valid = 0;
+	if (iface->ifindex > 0)
+		list_del_rcu(&iface->list);
+	else
+		RCU_INIT_POINTER(netlbl_unlhsh_def, NULL);
+	spin_unlock(&netlbl_unlhsh_lock);
+
+	call_rcu(&iface->rcu, netlbl_unlhsh_free_iface);
+	return;
+
+unlhsh_condremove_failure:
+	spin_unlock(&netlbl_unlhsh_lock);
+}
+
+/**
+ * netlbl_unlhsh_remove - Remove an entry from the unlabeled hash table
+ * @net: network namespace
+ * @dev_name: interface name
+ * @addr: IP address in network byte order
+ * @mask: address mask in network byte order
+ * @addr_len: length of address/mask (4 for IPv4, 16 for IPv6)
+ * @audit_info: NetLabel audit information
+ *
+ * Description:
+ * Removes and existing entry from the unlabeled connection hash table.
+ * Returns zero on success, negative values on failure.
+ *
+ */
+int netlbl_unlhsh_remove(struct net *net,
+			 const char *dev_name,
+			 const void *addr,
+			 const void *mask,
+			 u32 addr_len,
+			 struct netlbl_audit *audit_info)
+{
+	int ret_val;
+	struct net_device *dev;
+	struct netlbl_unlhsh_iface *iface;
+
+	if (addr_len != sizeof(struct in_addr) &&
+	    addr_len != sizeof(struct in6_addr))
+		return -EINVAL;
+
+	rcu_read_lock();
+	if (dev_name != NULL) {
+		dev = dev_get_by_name_rcu(net, dev_name);
+		if (dev == NULL) {
+			ret_val = -ENODEV;
+			goto unlhsh_remove_return;
+		}
+		iface = netlbl_unlhsh_search_iface(dev->ifindex);
+	} else
+		iface = rcu_dereference(netlbl_unlhsh_def);
+	if (iface == NULL) {
+		ret_val = -ENOENT;
+		goto unlhsh_remove_return;
+	}
+	switch (addr_len) {
+	case sizeof(struct in_addr):
+		ret_val = netlbl_unlhsh_remove_addr4(net,
+						     iface, addr, mask,
+						     audit_info);
+		break;
+#if IS_ENABLED(CONFIG_IPV6)
+	case sizeof(struct in6_addr):
+		ret_val = netlbl_unlhsh_remove_addr6(net,
+						     iface, addr, mask,
+						     audit_info);
+		break;
+#endif /* IPv6 */
+	default:
+		ret_val = -EINVAL;
+	}
+	if (ret_val == 0) {
+		netlbl_unlhsh_condremove_iface(iface);
+		atomic_dec(&netlabel_mgmt_protocount);
+	}
+
+unlhsh_remove_return:
+	rcu_read_unlock();
+	return ret_val;
+}
+
+/*
+ * General Helper Functions
+ */
+
+/**
+ * netlbl_unlhsh_netdev_handler - Network device notification handler
+ * @this: notifier block
+ * @event: the event
+ * @ptr: the netdevice notifier info (cast to void)
+ *
+ * Description:
+ * Handle network device events, although at present all we care about is a
+ * network device going away.  In the case of a device going away we clear any
+ * related entries from the unlabeled connection hash table.
+ *
+ */
+static int netlbl_unlhsh_netdev_handler(struct notifier_block *this,
+					unsigned long event, void *ptr)
+{
+	struct net_device *dev = netdev_notifier_info_to_dev(ptr);
+	struct netlbl_unlhsh_iface *iface = NULL;
+
+	if (!net_eq(dev_net(dev), &init_net))
+		return NOTIFY_DONE;
+
+	/* XXX - should this be a check for NETDEV_DOWN or _UNREGISTER? */
+	if (event == NETDEV_DOWN) {
+		spin_lock(&netlbl_unlhsh_lock);
+		iface = netlbl_unlhsh_search_iface(dev->ifindex);
+		if (iface != NULL && iface->valid) {
+			iface->valid = 0;
+			list_del_rcu(&iface->list);
+		} else
+			iface = NULL;
+		spin_unlock(&netlbl_unlhsh_lock);
+	}
+
+	if (iface != NULL)
+		call_rcu(&iface->rcu, netlbl_unlhsh_free_iface);
+
+	return NOTIFY_DONE;
+}
+
+/**
+ * netlbl_unlabel_acceptflg_set - Set the unlabeled accept flag
+ * @value: desired value
+ * @audit_info: NetLabel audit information
+ *
+ * Description:
+ * Set the value of the unlabeled accept flag to @value.
+ *
+ */
+static void netlbl_unlabel_acceptflg_set(u8 value,
+					 struct netlbl_audit *audit_info)
+{
+	struct audit_buffer *audit_buf;
+	u8 old_val;
+
+	old_val = netlabel_unlabel_acceptflg;
+	netlabel_unlabel_acceptflg = value;
+	audit_buf = netlbl_audit_start_common(AUDIT_MAC_UNLBL_ALLOW,
+					      audit_info);
+	if (audit_buf != NULL) {
+		audit_log_format(audit_buf,
+				 " unlbl_accept=%u old=%u", value, old_val);
+		audit_log_end(audit_buf);
+	}
+}
+
+/**
+ * netlbl_unlabel_addrinfo_get - Get the IPv4/6 address information
+ * @info: the Generic NETLINK info block
+ * @addr: the IP address
+ * @mask: the IP address mask
+ * @len: the address length
+ *
+ * Description:
+ * Examine the Generic NETLINK message and extract the IP address information.
+ * Returns zero on success, negative values on failure.
+ *
+ */
+static int netlbl_unlabel_addrinfo_get(struct genl_info *info,
+				       void **addr,
+				       void **mask,
+				       u32 *len)
+{
+	u32 addr_len;
+
+	if (info->attrs[NLBL_UNLABEL_A_IPV4ADDR]) {
+		addr_len = nla_len(info->attrs[NLBL_UNLABEL_A_IPV4ADDR]);
+		if (addr_len != sizeof(struct in_addr) &&
+		    addr_len != nla_len(info->attrs[NLBL_UNLABEL_A_IPV4MASK]))
+			return -EINVAL;
+		*len = addr_len;
+		*addr = nla_data(info->attrs[NLBL_UNLABEL_A_IPV4ADDR]);
+		*mask = nla_data(info->attrs[NLBL_UNLABEL_A_IPV4MASK]);
+		return 0;
+	} else if (info->attrs[NLBL_UNLABEL_A_IPV6ADDR]) {
+		addr_len = nla_len(info->attrs[NLBL_UNLABEL_A_IPV6ADDR]);
+		if (addr_len != sizeof(struct in6_addr) &&
+		    addr_len != nla_len(info->attrs[NLBL_UNLABEL_A_IPV6MASK]))
+			return -EINVAL;
+		*len = addr_len;
+		*addr = nla_data(info->attrs[NLBL_UNLABEL_A_IPV6ADDR]);
+		*mask = nla_data(info->attrs[NLBL_UNLABEL_A_IPV6MASK]);
+		return 0;
+	}
+
+	return -EINVAL;
+}
+
+/*
+ * NetLabel Command Handlers
+ */
+
+/**
+ * netlbl_unlabel_accept - Handle an ACCEPT message
+ * @skb: the NETLINK buffer
+ * @info: the Generic NETLINK info block
+ *
+ * Description:
+ * Process a user generated ACCEPT message and set the accept flag accordingly.
+ * Returns zero on success, negative values on failure.
+ *
+ */
+static int netlbl_unlabel_accept(struct sk_buff *skb, struct genl_info *info)
+{
+	u8 value;
+	struct netlbl_audit audit_info;
+
+	if (info->attrs[NLBL_UNLABEL_A_ACPTFLG]) {
+		value = nla_get_u8(info->attrs[NLBL_UNLABEL_A_ACPTFLG]);
+		if (value == 1 || value == 0) {
+			netlbl_netlink_auditinfo(skb, &audit_info);
+			netlbl_unlabel_acceptflg_set(value, &audit_info);
+			return 0;
+		}
+	}
+
+	return -EINVAL;
+}
+
+/**
+ * netlbl_unlabel_list - Handle a LIST message
+ * @skb: the NETLINK buffer
+ * @info: the Generic NETLINK info block
+ *
+ * Description:
+ * Process a user generated LIST message and respond with the current status.
+ * Returns zero on success, negative values on failure.
+ *
+ */
+static int netlbl_unlabel_list(struct sk_buff *skb, struct genl_info *info)
+{
+	int ret_val = -EINVAL;
+	struct sk_buff *ans_skb;
+	void *data;
+
+	ans_skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
+	if (ans_skb == NULL)
+		goto list_failure;
+	data = genlmsg_put_reply(ans_skb, info, &netlbl_unlabel_gnl_family,
+				 0, NLBL_UNLABEL_C_LIST);
+	if (data == NULL) {
+		ret_val = -ENOMEM;
+		goto list_failure;
+	}
+
+	ret_val = nla_put_u8(ans_skb,
+			     NLBL_UNLABEL_A_ACPTFLG,
+			     netlabel_unlabel_acceptflg);
+	if (ret_val != 0)
+		goto list_failure;
+
+	genlmsg_end(ans_skb, data);
+	return genlmsg_reply(ans_skb, info);
+
+list_failure:
+	kfree_skb(ans_skb);
+	return ret_val;
+}
+
+/**
+ * netlbl_unlabel_staticadd - Handle a STATICADD message
+ * @skb: the NETLINK buffer
+ * @info: the Generic NETLINK info block
+ *
+ * Description:
+ * Process a user generated STATICADD message and add a new unlabeled
+ * connection entry to the hash table.  Returns zero on success, negative
+ * values on failure.
+ *
+ */
+static int netlbl_unlabel_staticadd(struct sk_buff *skb,
+				    struct genl_info *info)
+{
+	int ret_val;
+	char *dev_name;
+	void *addr;
+	void *mask;
+	u32 addr_len;
+	u32 secid;
+	struct netlbl_audit audit_info;
+
+	/* Don't allow users to add both IPv4 and IPv6 addresses for a
+	 * single entry.  However, allow users to create two entries, one each
+	 * for IPv4 and IPv4, with the same LSM security context which should
+	 * achieve the same result. */
+	if (!info->attrs[NLBL_UNLABEL_A_SECCTX] ||
+	    !info->attrs[NLBL_UNLABEL_A_IFACE] ||
+	    !((!info->attrs[NLBL_UNLABEL_A_IPV4ADDR] ||
+	       !info->attrs[NLBL_UNLABEL_A_IPV4MASK]) ^
+	      (!info->attrs[NLBL_UNLABEL_A_IPV6ADDR] ||
+	       !info->attrs[NLBL_UNLABEL_A_IPV6MASK])))
+		return -EINVAL;
+
+	netlbl_netlink_auditinfo(skb, &audit_info);
+
+	ret_val = netlbl_unlabel_addrinfo_get(info, &addr, &mask, &addr_len);
+	if (ret_val != 0)
+		return ret_val;
+	dev_name = nla_data(info->attrs[NLBL_UNLABEL_A_IFACE]);
+	ret_val = security_secctx_to_secid(
+		                  nla_data(info->attrs[NLBL_UNLABEL_A_SECCTX]),
+				  nla_len(info->attrs[NLBL_UNLABEL_A_SECCTX]),
+				  &secid);
+	if (ret_val != 0)
+		return ret_val;
+
+	return netlbl_unlhsh_add(&init_net,
+				 dev_name, addr, mask, addr_len, secid,
+				 &audit_info);
+}
+
+/**
+ * netlbl_unlabel_staticadddef - Handle a STATICADDDEF message
+ * @skb: the NETLINK buffer
+ * @info: the Generic NETLINK info block
+ *
+ * Description:
+ * Process a user generated STATICADDDEF message and add a new default
+ * unlabeled connection entry.  Returns zero on success, negative values on
+ * failure.
+ *
+ */
+static int netlbl_unlabel_staticadddef(struct sk_buff *skb,
+				       struct genl_info *info)
+{
+	int ret_val;
+	void *addr;
+	void *mask;
+	u32 addr_len;
+	u32 secid;
+	struct netlbl_audit audit_info;
+
+	/* Don't allow users to add both IPv4 and IPv6 addresses for a
+	 * single entry.  However, allow users to create two entries, one each
+	 * for IPv4 and IPv6, with the same LSM security context which should
+	 * achieve the same result. */
+	if (!info->attrs[NLBL_UNLABEL_A_SECCTX] ||
+	    !((!info->attrs[NLBL_UNLABEL_A_IPV4ADDR] ||
+	       !info->attrs[NLBL_UNLABEL_A_IPV4MASK]) ^
+	      (!info->attrs[NLBL_UNLABEL_A_IPV6ADDR] ||
+	       !info->attrs[NLBL_UNLABEL_A_IPV6MASK])))
+		return -EINVAL;
+
+	netlbl_netlink_auditinfo(skb, &audit_info);
+
+	ret_val = netlbl_unlabel_addrinfo_get(info, &addr, &mask, &addr_len);
+	if (ret_val != 0)
+		return ret_val;
+	ret_val = security_secctx_to_secid(
+		                  nla_data(info->attrs[NLBL_UNLABEL_A_SECCTX]),
+				  nla_len(info->attrs[NLBL_UNLABEL_A_SECCTX]),
+				  &secid);
+	if (ret_val != 0)
+		return ret_val;
+
+	return netlbl_unlhsh_add(&init_net,
+				 NULL, addr, mask, addr_len, secid,
+				 &audit_info);
+}
+
+/**
+ * netlbl_unlabel_staticremove - Handle a STATICREMOVE message
+ * @skb: the NETLINK buffer
+ * @info: the Generic NETLINK info block
+ *
+ * Description:
+ * Process a user generated STATICREMOVE message and remove the specified
+ * unlabeled connection entry.  Returns zero on success, negative values on
+ * failure.
+ *
+ */
+static int netlbl_unlabel_staticremove(struct sk_buff *skb,
+				       struct genl_info *info)
+{
+	int ret_val;
+	char *dev_name;
+	void *addr;
+	void *mask;
+	u32 addr_len;
+	struct netlbl_audit audit_info;
+
+	/* See the note in netlbl_unlabel_staticadd() about not allowing both
+	 * IPv4 and IPv6 in the same entry. */
+	if (!info->attrs[NLBL_UNLABEL_A_IFACE] ||
+	    !((!info->attrs[NLBL_UNLABEL_A_IPV4ADDR] ||
+	       !info->attrs[NLBL_UNLABEL_A_IPV4MASK]) ^
+	      (!info->attrs[NLBL_UNLABEL_A_IPV6ADDR] ||
+	       !info->attrs[NLBL_UNLABEL_A_IPV6MASK])))
+		return -EINVAL;
+
+	netlbl_netlink_auditinfo(skb, &audit_info);
+
+	ret_val = netlbl_unlabel_addrinfo_get(info, &addr, &mask, &addr_len);
+	if (ret_val != 0)
+		return ret_val;
+	dev_name = nla_data(info->attrs[NLBL_UNLABEL_A_IFACE]);
+
+	return netlbl_unlhsh_remove(&init_net,
+				    dev_name, addr, mask, addr_len,
+				    &audit_info);
+}
+
+/**
+ * netlbl_unlabel_staticremovedef - Handle a STATICREMOVEDEF message
+ * @skb: the NETLINK buffer
+ * @info: the Generic NETLINK info block
+ *
+ * Description:
+ * Process a user generated STATICREMOVEDEF message and remove the default
+ * unlabeled connection entry.  Returns zero on success, negative values on
+ * failure.
+ *
+ */
+static int netlbl_unlabel_staticremovedef(struct sk_buff *skb,
+					  struct genl_info *info)
+{
+	int ret_val;
+	void *addr;
+	void *mask;
+	u32 addr_len;
+	struct netlbl_audit audit_info;
+
+	/* See the note in netlbl_unlabel_staticadd() about not allowing both
+	 * IPv4 and IPv6 in the same entry. */
+	if (!((!info->attrs[NLBL_UNLABEL_A_IPV4ADDR] ||
+	       !info->attrs[NLBL_UNLABEL_A_IPV4MASK]) ^
+	      (!info->attrs[NLBL_UNLABEL_A_IPV6ADDR] ||
+	       !info->attrs[NLBL_UNLABEL_A_IPV6MASK])))
+		return -EINVAL;
+
+	netlbl_netlink_auditinfo(skb, &audit_info);
+
+	ret_val = netlbl_unlabel_addrinfo_get(info, &addr, &mask, &addr_len);
+	if (ret_val != 0)
+		return ret_val;
+
+	return netlbl_unlhsh_remove(&init_net,
+				    NULL, addr, mask, addr_len,
+				    &audit_info);
+}
+
+
+/**
+ * netlbl_unlabel_staticlist_gen - Generate messages for STATICLIST[DEF]
+ * @cmd: command/message
+ * @iface: the interface entry
+ * @addr4: the IPv4 address entry
+ * @addr6: the IPv6 address entry
+ * @arg: the netlbl_unlhsh_walk_arg structure
+ *
+ * Description:
+ * This function is designed to be used to generate a response for a
+ * STATICLIST or STATICLISTDEF message.  When called either @addr4 or @addr6
+ * can be specified, not both, the other unspecified entry should be set to
+ * NULL by the caller.  Returns the size of the message on success, negative
+ * values on failure.
+ *
+ */
+static int netlbl_unlabel_staticlist_gen(u32 cmd,
+				       const struct netlbl_unlhsh_iface *iface,
+				       const struct netlbl_unlhsh_addr4 *addr4,
+				       const struct netlbl_unlhsh_addr6 *addr6,
+				       void *arg)
+{
+	int ret_val = -ENOMEM;
+	struct netlbl_unlhsh_walk_arg *cb_arg = arg;
+	struct net_device *dev;
+	void *data;
+	u32 secid;
+	char *secctx;
+	u32 secctx_len;
+
+	data = genlmsg_put(cb_arg->skb, NETLINK_CB(cb_arg->nl_cb->skb).portid,
+			   cb_arg->seq, &netlbl_unlabel_gnl_family,
+			   NLM_F_MULTI, cmd);
+	if (data == NULL)
+		goto list_cb_failure;
+
+	if (iface->ifindex > 0) {
+		dev = dev_get_by_index(&init_net, iface->ifindex);
+		if (!dev) {
+			ret_val = -ENODEV;
+			goto list_cb_failure;
+		}
+		ret_val = nla_put_string(cb_arg->skb,
+					 NLBL_UNLABEL_A_IFACE, dev->name);
+		dev_put(dev);
+		if (ret_val != 0)
+			goto list_cb_failure;
+	}
+
+	if (addr4) {
+		struct in_addr addr_struct;
+
+		addr_struct.s_addr = addr4->list.addr;
+		ret_val = nla_put_in_addr(cb_arg->skb,
+					  NLBL_UNLABEL_A_IPV4ADDR,
+					  addr_struct.s_addr);
+		if (ret_val != 0)
+			goto list_cb_failure;
+
+		addr_struct.s_addr = addr4->list.mask;
+		ret_val = nla_put_in_addr(cb_arg->skb,
+					  NLBL_UNLABEL_A_IPV4MASK,
+					  addr_struct.s_addr);
+		if (ret_val != 0)
+			goto list_cb_failure;
+
+		secid = addr4->secid;
+	} else {
+		ret_val = nla_put_in6_addr(cb_arg->skb,
+					   NLBL_UNLABEL_A_IPV6ADDR,
+					   &addr6->list.addr);
+		if (ret_val != 0)
+			goto list_cb_failure;
+
+		ret_val = nla_put_in6_addr(cb_arg->skb,
+					   NLBL_UNLABEL_A_IPV6MASK,
+					   &addr6->list.mask);
+		if (ret_val != 0)
+			goto list_cb_failure;
+
+		secid = addr6->secid;
+	}
+
+	ret_val = security_secid_to_secctx(secid, &secctx, &secctx_len);
+	if (ret_val != 0)
+		goto list_cb_failure;
+	ret_val = nla_put(cb_arg->skb,
+			  NLBL_UNLABEL_A_SECCTX,
+			  secctx_len,
+			  secctx);
+	security_release_secctx(secctx, secctx_len);
+	if (ret_val != 0)
+		goto list_cb_failure;
+
+	cb_arg->seq++;
+	genlmsg_end(cb_arg->skb, data);
+	return 0;
+
+list_cb_failure:
+	genlmsg_cancel(cb_arg->skb, data);
+	return ret_val;
+}
+
+/**
+ * netlbl_unlabel_staticlist - Handle a STATICLIST message
+ * @skb: the NETLINK buffer
+ * @cb: the NETLINK callback
+ *
+ * Description:
+ * Process a user generated STATICLIST message and dump the unlabeled
+ * connection hash table in a form suitable for use in a kernel generated
+ * STATICLIST message.  Returns the length of @skb.
+ *
+ */
+static int netlbl_unlabel_staticlist(struct sk_buff *skb,
+				     struct netlink_callback *cb)
+{
+	struct netlbl_unlhsh_walk_arg cb_arg;
+	u32 skip_bkt = cb->args[0];
+	u32 skip_chain = cb->args[1];
+	u32 iter_bkt;
+	u32 iter_chain = 0, iter_addr4 = 0, iter_addr6 = 0;
+	struct netlbl_unlhsh_iface *iface;
+	struct list_head *iter_list;
+	struct netlbl_af4list *addr4;
+#if IS_ENABLED(CONFIG_IPV6)
+	struct netlbl_af6list *addr6;
+#endif
+
+	cb_arg.nl_cb = cb;
+	cb_arg.skb = skb;
+	cb_arg.seq = cb->nlh->nlmsg_seq;
+
+	rcu_read_lock();
+	for (iter_bkt = skip_bkt;
+	     iter_bkt < rcu_dereference(netlbl_unlhsh)->size;
+	     iter_bkt++, iter_chain = 0, iter_addr4 = 0, iter_addr6 = 0) {
+		iter_list = &rcu_dereference(netlbl_unlhsh)->tbl[iter_bkt];
+		list_for_each_entry_rcu(iface, iter_list, list) {
+			if (!iface->valid ||
+			    iter_chain++ < skip_chain)
+				continue;
+			netlbl_af4list_foreach_rcu(addr4,
+						   &iface->addr4_list) {
+				if (iter_addr4++ < cb->args[2])
+					continue;
+				if (netlbl_unlabel_staticlist_gen(
+					      NLBL_UNLABEL_C_STATICLIST,
+					      iface,
+					      netlbl_unlhsh_addr4_entry(addr4),
+					      NULL,
+					      &cb_arg) < 0) {
+					iter_addr4--;
+					iter_chain--;
+					goto unlabel_staticlist_return;
+				}
+			}
+#if IS_ENABLED(CONFIG_IPV6)
+			netlbl_af6list_foreach_rcu(addr6,
+						   &iface->addr6_list) {
+				if (iter_addr6++ < cb->args[3])
+					continue;
+				if (netlbl_unlabel_staticlist_gen(
+					      NLBL_UNLABEL_C_STATICLIST,
+					      iface,
+					      NULL,
+					      netlbl_unlhsh_addr6_entry(addr6),
+					      &cb_arg) < 0) {
+					iter_addr6--;
+					iter_chain--;
+					goto unlabel_staticlist_return;
+				}
+			}
+#endif /* IPv6 */
+		}
+	}
+
+unlabel_staticlist_return:
+	rcu_read_unlock();
+	cb->args[0] = iter_bkt;
+	cb->args[1] = iter_chain;
+	cb->args[2] = iter_addr4;
+	cb->args[3] = iter_addr6;
+	return skb->len;
+}
+
+/**
+ * netlbl_unlabel_staticlistdef - Handle a STATICLISTDEF message
+ * @skb: the NETLINK buffer
+ * @cb: the NETLINK callback
+ *
+ * Description:
+ * Process a user generated STATICLISTDEF message and dump the default
+ * unlabeled connection entry in a form suitable for use in a kernel generated
+ * STATICLISTDEF message.  Returns the length of @skb.
+ *
+ */
+static int netlbl_unlabel_staticlistdef(struct sk_buff *skb,
+					struct netlink_callback *cb)
+{
+	struct netlbl_unlhsh_walk_arg cb_arg;
+	struct netlbl_unlhsh_iface *iface;
+	u32 iter_addr4 = 0, iter_addr6 = 0;
+	struct netlbl_af4list *addr4;
+#if IS_ENABLED(CONFIG_IPV6)
+	struct netlbl_af6list *addr6;
+#endif
+
+	cb_arg.nl_cb = cb;
+	cb_arg.skb = skb;
+	cb_arg.seq = cb->nlh->nlmsg_seq;
+
+	rcu_read_lock();
+	iface = rcu_dereference(netlbl_unlhsh_def);
+	if (iface == NULL || !iface->valid)
+		goto unlabel_staticlistdef_return;
+
+	netlbl_af4list_foreach_rcu(addr4, &iface->addr4_list) {
+		if (iter_addr4++ < cb->args[0])
+			continue;
+		if (netlbl_unlabel_staticlist_gen(NLBL_UNLABEL_C_STATICLISTDEF,
+					      iface,
+					      netlbl_unlhsh_addr4_entry(addr4),
+					      NULL,
+					      &cb_arg) < 0) {
+			iter_addr4--;
+			goto unlabel_staticlistdef_return;
+		}
+	}
+#if IS_ENABLED(CONFIG_IPV6)
+	netlbl_af6list_foreach_rcu(addr6, &iface->addr6_list) {
+		if (iter_addr6++ < cb->args[1])
+			continue;
+		if (netlbl_unlabel_staticlist_gen(NLBL_UNLABEL_C_STATICLISTDEF,
+					      iface,
+					      NULL,
+					      netlbl_unlhsh_addr6_entry(addr6),
+					      &cb_arg) < 0) {
+			iter_addr6--;
+			goto unlabel_staticlistdef_return;
+		}
+	}
+#endif /* IPv6 */
+
+unlabel_staticlistdef_return:
+	rcu_read_unlock();
+	cb->args[0] = iter_addr4;
+	cb->args[1] = iter_addr6;
+	return skb->len;
+}
+
+/*
+ * NetLabel Generic NETLINK Command Definitions
+ */
+
+static const struct genl_ops netlbl_unlabel_genl_ops[] = {
+	{
+	.cmd = NLBL_UNLABEL_C_STATICADD,
+	.flags = GENL_ADMIN_PERM,
+	.policy = netlbl_unlabel_genl_policy,
+	.doit = netlbl_unlabel_staticadd,
+	.dumpit = NULL,
+	},
+	{
+	.cmd = NLBL_UNLABEL_C_STATICREMOVE,
+	.flags = GENL_ADMIN_PERM,
+	.policy = netlbl_unlabel_genl_policy,
+	.doit = netlbl_unlabel_staticremove,
+	.dumpit = NULL,
+	},
+	{
+	.cmd = NLBL_UNLABEL_C_STATICLIST,
+	.flags = 0,
+	.policy = netlbl_unlabel_genl_policy,
+	.doit = NULL,
+	.dumpit = netlbl_unlabel_staticlist,
+	},
+	{
+	.cmd = NLBL_UNLABEL_C_STATICADDDEF,
+	.flags = GENL_ADMIN_PERM,
+	.policy = netlbl_unlabel_genl_policy,
+	.doit = netlbl_unlabel_staticadddef,
+	.dumpit = NULL,
+	},
+	{
+	.cmd = NLBL_UNLABEL_C_STATICREMOVEDEF,
+	.flags = GENL_ADMIN_PERM,
+	.policy = netlbl_unlabel_genl_policy,
+	.doit = netlbl_unlabel_staticremovedef,
+	.dumpit = NULL,
+	},
+	{
+	.cmd = NLBL_UNLABEL_C_STATICLISTDEF,
+	.flags = 0,
+	.policy = netlbl_unlabel_genl_policy,
+	.doit = NULL,
+	.dumpit = netlbl_unlabel_staticlistdef,
+	},
+	{
+	.cmd = NLBL_UNLABEL_C_ACCEPT,
+	.flags = GENL_ADMIN_PERM,
+	.policy = netlbl_unlabel_genl_policy,
+	.doit = netlbl_unlabel_accept,
+	.dumpit = NULL,
+	},
+	{
+	.cmd = NLBL_UNLABEL_C_LIST,
+	.flags = 0,
+	.policy = netlbl_unlabel_genl_policy,
+	.doit = netlbl_unlabel_list,
+	.dumpit = NULL,
+	},
+};
+
+/*
+ * NetLabel Generic NETLINK Protocol Functions
+ */
+
+/**
+ * netlbl_unlabel_genl_init - Register the Unlabeled NetLabel component
+ *
+ * Description:
+ * Register the unlabeled packet NetLabel component with the Generic NETLINK
+ * mechanism.  Returns zero on success, negative values on failure.
+ *
+ */
+int __init netlbl_unlabel_genl_init(void)
+{
+	return genl_register_family_with_ops(&netlbl_unlabel_gnl_family,
+					     netlbl_unlabel_genl_ops);
+}
+
+/*
+ * NetLabel KAPI Hooks
+ */
+
+static struct notifier_block netlbl_unlhsh_netdev_notifier = {
+	.notifier_call = netlbl_unlhsh_netdev_handler,
+};
+
+/**
+ * netlbl_unlabel_init - Initialize the unlabeled connection hash table
+ * @size: the number of bits to use for the hash buckets
+ *
+ * Description:
+ * Initializes the unlabeled connection hash table and registers a network
+ * device notification handler.  This function should only be called by the
+ * NetLabel subsystem itself during initialization.  Returns zero on success,
+ * non-zero values on error.
+ *
+ */
+int __init netlbl_unlabel_init(u32 size)
+{
+	u32 iter;
+	struct netlbl_unlhsh_tbl *hsh_tbl;
+
+	if (size == 0)
+		return -EINVAL;
+
+	hsh_tbl = kmalloc(sizeof(*hsh_tbl), GFP_KERNEL);
+	if (hsh_tbl == NULL)
+		return -ENOMEM;
+	hsh_tbl->size = 1 << size;
+	hsh_tbl->tbl = kcalloc(hsh_tbl->size,
+			       sizeof(struct list_head),
+			       GFP_KERNEL);
+	if (hsh_tbl->tbl == NULL) {
+		kfree(hsh_tbl);
+		return -ENOMEM;
+	}
+	for (iter = 0; iter < hsh_tbl->size; iter++)
+		INIT_LIST_HEAD(&hsh_tbl->tbl[iter]);
+
+	spin_lock(&netlbl_unlhsh_lock);
+	rcu_assign_pointer(netlbl_unlhsh, hsh_tbl);
+	spin_unlock(&netlbl_unlhsh_lock);
+
+	register_netdevice_notifier(&netlbl_unlhsh_netdev_notifier);
+
+	return 0;
+}
+
+/**
+ * netlbl_unlabel_getattr - Get the security attributes for an unlabled packet
+ * @skb: the packet
+ * @family: protocol family
+ * @secattr: the security attributes
+ *
+ * Description:
+ * Determine the security attributes, if any, for an unlabled packet and return
+ * them in @secattr.  Returns zero on success and negative values on failure.
+ *
+ */
+int netlbl_unlabel_getattr(const struct sk_buff *skb,
+			   u16 family,
+			   struct netlbl_lsm_secattr *secattr)
+{
+	struct netlbl_unlhsh_iface *iface;
+
+	rcu_read_lock();
+	iface = netlbl_unlhsh_search_iface(skb->skb_iif);
+	if (iface == NULL)
+		iface = rcu_dereference(netlbl_unlhsh_def);
+	if (iface == NULL || !iface->valid)
+		goto unlabel_getattr_nolabel;
+	switch (family) {
+	case PF_INET: {
+		struct iphdr *hdr4;
+		struct netlbl_af4list *addr4;
+
+		hdr4 = ip_hdr(skb);
+		addr4 = netlbl_af4list_search(hdr4->saddr,
+					      &iface->addr4_list);
+		if (addr4 == NULL)
+			goto unlabel_getattr_nolabel;
+		secattr->attr.secid = netlbl_unlhsh_addr4_entry(addr4)->secid;
+		break;
+	}
+#if IS_ENABLED(CONFIG_IPV6)
+	case PF_INET6: {
+		struct ipv6hdr *hdr6;
+		struct netlbl_af6list *addr6;
+
+		hdr6 = ipv6_hdr(skb);
+		addr6 = netlbl_af6list_search(&hdr6->saddr,
+					      &iface->addr6_list);
+		if (addr6 == NULL)
+			goto unlabel_getattr_nolabel;
+		secattr->attr.secid = netlbl_unlhsh_addr6_entry(addr6)->secid;
+		break;
+	}
+#endif /* IPv6 */
+	default:
+		goto unlabel_getattr_nolabel;
+	}
+	rcu_read_unlock();
+
+	secattr->flags |= NETLBL_SECATTR_SECID;
+	secattr->type = NETLBL_NLTYPE_UNLABELED;
+	return 0;
+
+unlabel_getattr_nolabel:
+	rcu_read_unlock();
+	if (netlabel_unlabel_acceptflg == 0)
+		return -ENOMSG;
+	secattr->type = NETLBL_NLTYPE_UNLABELED;
+	return 0;
+}
+
+/**
+ * netlbl_unlabel_defconf - Set the default config to allow unlabeled packets
+ *
+ * Description:
+ * Set the default NetLabel configuration to allow incoming unlabeled packets
+ * and to send unlabeled network traffic by default.
+ *
+ */
+int __init netlbl_unlabel_defconf(void)
+{
+	int ret_val;
+	struct netlbl_dom_map *entry;
+	struct netlbl_audit audit_info;
+
+	/* Only the kernel is allowed to call this function and the only time
+	 * it is called is at bootup before the audit subsystem is reporting
+	 * messages so don't worry to much about these values. */
+	security_task_getsecid(current, &audit_info.secid);
+	audit_info.loginuid = GLOBAL_ROOT_UID;
+	audit_info.sessionid = 0;
+
+	entry = kzalloc(sizeof(*entry), GFP_KERNEL);
+	if (entry == NULL)
+		return -ENOMEM;
+	entry->def.type = NETLBL_NLTYPE_UNLABELED;
+	ret_val = netlbl_domhsh_add_default(entry, &audit_info);
+	if (ret_val != 0)
+		return ret_val;
+
+	netlbl_unlabel_acceptflg_set(1, &audit_info);
+
+	return 0;
+}