Adding upstream version 5.10.209.upstream/5.10.209upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

17 files changed, 8034 insertions, 0 deletions

diff --git a/net/netlabel/Kconfig b/net/netlabel/Kconfig
new file mode 100644
index 000000000..4383ac296
--- /dev/null
+++ b/net/netlabel/Kconfig
@@ -0,0 +1,19 @@
+# SPDX-License-Identifier: GPL-2.0-only
+#
+# NetLabel configuration
+#
+
+config NETLABEL
+	bool "NetLabel subsystem support"
+	depends on SECURITY
+	select CRC_CCITT if IPV6
+	default n
+	help
+	  NetLabel provides support for explicit network packet labeling
+	  protocols such as CIPSO and RIPSO.  For more information see
+	  Documentation/netlabel as well as the NetLabel SourceForge project
+	  for configuration tools and additional documentation.
+
+	   * https://github.com/netlabel/netlabel_tools
+
+	  If you are unsure, say N.
diff --git a/net/netlabel/Makefile b/net/netlabel/Makefile
new file mode 100644
index 000000000..5a46381a6
--- /dev/null
+++ b/net/netlabel/Makefile
@@ -0,0 +1,16 @@
+# SPDX-License-Identifier: GPL-2.0
+#
+# Makefile for the NetLabel subsystem.
+#
+
+# base objects
+obj-y	:= netlabel_user.o netlabel_kapi.o
+obj-y	+= netlabel_domainhash.o netlabel_addrlist.o
+
+# management objects
+obj-y	+= netlabel_mgmt.o
+
+# protocol modules
+obj-y	+= netlabel_unlabeled.o
+obj-y	+= netlabel_cipso_v4.o
+obj-$(subst m,y,$(CONFIG_IPV6)) += netlabel_calipso.o
diff --git a/net/netlabel/netlabel_addrlist.c b/net/netlabel/netlabel_addrlist.c
new file mode 100644
index 000000000..3282acf7f
--- /dev/null
+++ b/net/netlabel/netlabel_addrlist.c
@@ -0,0 +1,369 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * NetLabel Network Address Lists
+ *
+ * This file contains network address list functions used to manage ordered
+ * lists of network addresses for use by the NetLabel subsystem.  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., 2008
+ */
+
+#include <linux/types.h>
+#include <linux/rcupdate.h>
+#include <linux/list.h>
+#include <linux/spinlock.h>
+#include <linux/in.h>
+#include <linux/in6.h>
+#include <linux/ip.h>
+#include <linux/ipv6.h>
+#include <net/ip.h>
+#include <net/ipv6.h>
+#include <linux/audit.h>
+
+#include "netlabel_addrlist.h"
+
+/*
+ * Address List Functions
+ */
+
+/**
+ * netlbl_af4list_search - Search for a matching IPv4 address entry
+ * @addr: IPv4 address
+ * @head: the list head
+ *
+ * Description:
+ * Searches the IPv4 address list given by @head.  If a matching address entry
+ * is found it is returned, otherwise NULL is returned.  The caller is
+ * responsible for calling the rcu_read_[un]lock() functions.
+ *
+ */
+struct netlbl_af4list *netlbl_af4list_search(__be32 addr,
+					     struct list_head *head)
+{
+	struct netlbl_af4list *iter;
+
+	list_for_each_entry_rcu(iter, head, list)
+		if (iter->valid && (addr & iter->mask) == iter->addr)
+			return iter;
+
+	return NULL;
+}
+
+/**
+ * netlbl_af4list_search_exact - Search for an exact IPv4 address entry
+ * @addr: IPv4 address
+ * @mask: IPv4 address mask
+ * @head: the list head
+ *
+ * Description:
+ * Searches the IPv4 address list given by @head.  If an exact match if found
+ * it is returned, otherwise NULL is returned.  The caller is responsible for
+ * calling the rcu_read_[un]lock() functions.
+ *
+ */
+struct netlbl_af4list *netlbl_af4list_search_exact(__be32 addr,
+						   __be32 mask,
+						   struct list_head *head)
+{
+	struct netlbl_af4list *iter;
+
+	list_for_each_entry_rcu(iter, head, list)
+		if (iter->valid && iter->addr == addr && iter->mask == mask)
+			return iter;
+
+	return NULL;
+}
+
+
+#if IS_ENABLED(CONFIG_IPV6)
+/**
+ * netlbl_af6list_search - Search for a matching IPv6 address entry
+ * @addr: IPv6 address
+ * @head: the list head
+ *
+ * Description:
+ * Searches the IPv6 address list given by @head.  If a matching address entry
+ * is found it is returned, otherwise NULL is returned.  The caller is
+ * responsible for calling the rcu_read_[un]lock() functions.
+ *
+ */
+struct netlbl_af6list *netlbl_af6list_search(const struct in6_addr *addr,
+					     struct list_head *head)
+{
+	struct netlbl_af6list *iter;
+
+	list_for_each_entry_rcu(iter, head, list)
+		if (iter->valid &&
+		    ipv6_masked_addr_cmp(&iter->addr, &iter->mask, addr) == 0)
+			return iter;
+
+	return NULL;
+}
+
+/**
+ * netlbl_af6list_search_exact - Search for an exact IPv6 address entry
+ * @addr: IPv6 address
+ * @mask: IPv6 address mask
+ * @head: the list head
+ *
+ * Description:
+ * Searches the IPv6 address list given by @head.  If an exact match if found
+ * it is returned, otherwise NULL is returned.  The caller is responsible for
+ * calling the rcu_read_[un]lock() functions.
+ *
+ */
+struct netlbl_af6list *netlbl_af6list_search_exact(const struct in6_addr *addr,
+						   const struct in6_addr *mask,
+						   struct list_head *head)
+{
+	struct netlbl_af6list *iter;
+
+	list_for_each_entry_rcu(iter, head, list)
+		if (iter->valid &&
+		    ipv6_addr_equal(&iter->addr, addr) &&
+		    ipv6_addr_equal(&iter->mask, mask))
+			return iter;
+
+	return NULL;
+}
+#endif /* IPv6 */
+
+/**
+ * netlbl_af4list_add - Add a new IPv4 address entry to a list
+ * @entry: address entry
+ * @head: the list head
+ *
+ * Description:
+ * Add a new address entry to the list pointed to by @head.  On success zero is
+ * returned, otherwise a negative value is returned.  The caller is responsible
+ * for calling the necessary locking functions.
+ *
+ */
+int netlbl_af4list_add(struct netlbl_af4list *entry, struct list_head *head)
+{
+	struct netlbl_af4list *iter;
+
+	iter = netlbl_af4list_search(entry->addr, head);
+	if (iter != NULL &&
+	    iter->addr == entry->addr && iter->mask == entry->mask)
+		return -EEXIST;
+
+	/* in order to speed up address searches through the list (the common
+	 * case) we need to keep the list in order based on the size of the
+	 * address mask such that the entry with the widest mask (smallest
+	 * numerical value) appears first in the list */
+	list_for_each_entry_rcu(iter, head, list)
+		if (iter->valid &&
+		    ntohl(entry->mask) > ntohl(iter->mask)) {
+			__list_add_rcu(&entry->list,
+				       iter->list.prev,
+				       &iter->list);
+			return 0;
+		}
+	list_add_tail_rcu(&entry->list, head);
+	return 0;
+}
+
+#if IS_ENABLED(CONFIG_IPV6)
+/**
+ * netlbl_af6list_add - Add a new IPv6 address entry to a list
+ * @entry: address entry
+ * @head: the list head
+ *
+ * Description:
+ * Add a new address entry to the list pointed to by @head.  On success zero is
+ * returned, otherwise a negative value is returned.  The caller is responsible
+ * for calling the necessary locking functions.
+ *
+ */
+int netlbl_af6list_add(struct netlbl_af6list *entry, struct list_head *head)
+{
+	struct netlbl_af6list *iter;
+
+	iter = netlbl_af6list_search(&entry->addr, head);
+	if (iter != NULL &&
+	    ipv6_addr_equal(&iter->addr, &entry->addr) &&
+	    ipv6_addr_equal(&iter->mask, &entry->mask))
+		return -EEXIST;
+
+	/* in order to speed up address searches through the list (the common
+	 * case) we need to keep the list in order based on the size of the
+	 * address mask such that the entry with the widest mask (smallest
+	 * numerical value) appears first in the list */
+	list_for_each_entry_rcu(iter, head, list)
+		if (iter->valid &&
+		    ipv6_addr_cmp(&entry->mask, &iter->mask) > 0) {
+			__list_add_rcu(&entry->list,
+				       iter->list.prev,
+				       &iter->list);
+			return 0;
+		}
+	list_add_tail_rcu(&entry->list, head);
+	return 0;
+}
+#endif /* IPv6 */
+
+/**
+ * netlbl_af4list_remove_entry - Remove an IPv4 address entry
+ * @entry: address entry
+ *
+ * Description:
+ * Remove the specified IP address entry.  The caller is responsible for
+ * calling the necessary locking functions.
+ *
+ */
+void netlbl_af4list_remove_entry(struct netlbl_af4list *entry)
+{
+	entry->valid = 0;
+	list_del_rcu(&entry->list);
+}
+
+/**
+ * netlbl_af4list_remove - Remove an IPv4 address entry
+ * @addr: IP address
+ * @mask: IP address mask
+ * @head: the list head
+ *
+ * Description:
+ * Remove an IP address entry from the list pointed to by @head.  Returns the
+ * entry on success, NULL on failure.  The caller is responsible for calling
+ * the necessary locking functions.
+ *
+ */
+struct netlbl_af4list *netlbl_af4list_remove(__be32 addr, __be32 mask,
+					     struct list_head *head)
+{
+	struct netlbl_af4list *entry;
+
+	entry = netlbl_af4list_search_exact(addr, mask, head);
+	if (entry == NULL)
+		return NULL;
+	netlbl_af4list_remove_entry(entry);
+	return entry;
+}
+
+#if IS_ENABLED(CONFIG_IPV6)
+/**
+ * netlbl_af6list_remove_entry - Remove an IPv6 address entry
+ * @entry: address entry
+ *
+ * Description:
+ * Remove the specified IP address entry.  The caller is responsible for
+ * calling the necessary locking functions.
+ *
+ */
+void netlbl_af6list_remove_entry(struct netlbl_af6list *entry)
+{
+	entry->valid = 0;
+	list_del_rcu(&entry->list);
+}
+
+/**
+ * netlbl_af6list_remove - Remove an IPv6 address entry
+ * @addr: IP address
+ * @mask: IP address mask
+ * @head: the list head
+ *
+ * Description:
+ * Remove an IP address entry from the list pointed to by @head.  Returns the
+ * entry on success, NULL on failure.  The caller is responsible for calling
+ * the necessary locking functions.
+ *
+ */
+struct netlbl_af6list *netlbl_af6list_remove(const struct in6_addr *addr,
+					     const struct in6_addr *mask,
+					     struct list_head *head)
+{
+	struct netlbl_af6list *entry;
+
+	entry = netlbl_af6list_search_exact(addr, mask, head);
+	if (entry == NULL)
+		return NULL;
+	netlbl_af6list_remove_entry(entry);
+	return entry;
+}
+#endif /* IPv6 */
+
+/*
+ * Audit Helper Functions
+ */
+
+#ifdef CONFIG_AUDIT
+/**
+ * netlbl_af4list_audit_addr - Audit an IPv4 address
+ * @audit_buf: audit buffer
+ * @src: true if source address, false if destination
+ * @dev: network interface
+ * @addr: IP address
+ * @mask: IP address mask
+ *
+ * Description:
+ * Write the IPv4 address and address mask, if necessary, to @audit_buf.
+ *
+ */
+void netlbl_af4list_audit_addr(struct audit_buffer *audit_buf,
+					int src, const char *dev,
+					__be32 addr, __be32 mask)
+{
+	u32 mask_val = ntohl(mask);
+	char *dir = (src ? "src" : "dst");
+
+	if (dev != NULL)
+		audit_log_format(audit_buf, " netif=%s", dev);
+	audit_log_format(audit_buf, " %s=%pI4", dir, &addr);
+	if (mask_val != 0xffffffff) {
+		u32 mask_len = 0;
+		while (mask_val > 0) {
+			mask_val <<= 1;
+			mask_len++;
+		}
+		audit_log_format(audit_buf, " %s_prefixlen=%d", dir, mask_len);
+	}
+}
+
+#if IS_ENABLED(CONFIG_IPV6)
+/**
+ * netlbl_af6list_audit_addr - Audit an IPv6 address
+ * @audit_buf: audit buffer
+ * @src: true if source address, false if destination
+ * @dev: network interface
+ * @addr: IP address
+ * @mask: IP address mask
+ *
+ * Description:
+ * Write the IPv6 address and address mask, if necessary, to @audit_buf.
+ *
+ */
+void netlbl_af6list_audit_addr(struct audit_buffer *audit_buf,
+				 int src,
+				 const char *dev,
+				 const struct in6_addr *addr,
+				 const struct in6_addr *mask)
+{
+	char *dir = (src ? "src" : "dst");
+
+	if (dev != NULL)
+		audit_log_format(audit_buf, " netif=%s", dev);
+	audit_log_format(audit_buf, " %s=%pI6", dir, addr);
+	if (ntohl(mask->s6_addr32[3]) != 0xffffffff) {
+		u32 mask_len = 0;
+		u32 mask_val;
+		int iter = -1;
+		while (ntohl(mask->s6_addr32[++iter]) == 0xffffffff)
+			mask_len += 32;
+		mask_val = ntohl(mask->s6_addr32[iter]);
+		while (mask_val > 0) {
+			mask_val <<= 1;
+			mask_len++;
+		}
+		audit_log_format(audit_buf, " %s_prefixlen=%d", dir, mask_len);
+	}
+}
+#endif /* IPv6 */
+#endif /* CONFIG_AUDIT */
diff --git a/net/netlabel/netlabel_addrlist.h b/net/netlabel/netlabel_addrlist.h
new file mode 100644
index 000000000..a01cf4955
--- /dev/null
+++ b/net/netlabel/netlabel_addrlist.h
@@ -0,0 +1,194 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * NetLabel Network Address Lists
+ *
+ * This file contains network address list functions used to manage ordered
+ * lists of network addresses for use by the NetLabel subsystem.  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., 2008
+ */
+
+#ifndef _NETLABEL_ADDRLIST_H
+#define _NETLABEL_ADDRLIST_H
+
+#include <linux/types.h>
+#include <linux/rcupdate.h>
+#include <linux/list.h>
+#include <linux/in6.h>
+#include <linux/audit.h>
+
+/**
+ * struct netlbl_af4list - NetLabel IPv4 address list
+ * @addr: IPv4 address
+ * @mask: IPv4 address mask
+ * @valid: valid flag
+ * @list: list structure, used internally
+ */
+struct netlbl_af4list {
+	__be32 addr;
+	__be32 mask;
+
+	u32 valid;
+	struct list_head list;
+};
+
+/**
+ * struct netlbl_af6list - NetLabel IPv6 address list
+ * @addr: IPv6 address
+ * @mask: IPv6 address mask
+ * @valid: valid flag
+ * @list: list structure, used internally
+ */
+struct netlbl_af6list {
+	struct in6_addr addr;
+	struct in6_addr mask;
+
+	u32 valid;
+	struct list_head list;
+};
+
+#define __af4list_entry(ptr) container_of(ptr, struct netlbl_af4list, list)
+
+static inline struct netlbl_af4list *__af4list_valid(struct list_head *s,
+						     struct list_head *h)
+{
+	struct list_head *i = s;
+	struct netlbl_af4list *n = __af4list_entry(s);
+	while (i != h && !n->valid) {
+		i = i->next;
+		n = __af4list_entry(i);
+	}
+	return n;
+}
+
+static inline struct netlbl_af4list *__af4list_valid_rcu(struct list_head *s,
+							 struct list_head *h)
+{
+	struct list_head *i = s;
+	struct netlbl_af4list *n = __af4list_entry(s);
+	while (i != h && !n->valid) {
+		i = rcu_dereference(list_next_rcu(i));
+		n = __af4list_entry(i);
+	}
+	return n;
+}
+
+#define netlbl_af4list_foreach(iter, head)				\
+	for (iter = __af4list_valid((head)->next, head);		\
+	     &iter->list != (head);					\
+	     iter = __af4list_valid(iter->list.next, head))
+
+#define netlbl_af4list_foreach_rcu(iter, head)				\
+	for (iter = __af4list_valid_rcu((head)->next, head);		\
+	     &iter->list != (head);					\
+	     iter = __af4list_valid_rcu(iter->list.next, head))
+
+#define netlbl_af4list_foreach_safe(iter, tmp, head)			\
+	for (iter = __af4list_valid((head)->next, head),		\
+		     tmp = __af4list_valid(iter->list.next, head);	\
+	     &iter->list != (head);					\
+	     iter = tmp, tmp = __af4list_valid(iter->list.next, head))
+
+int netlbl_af4list_add(struct netlbl_af4list *entry,
+		       struct list_head *head);
+struct netlbl_af4list *netlbl_af4list_remove(__be32 addr, __be32 mask,
+					     struct list_head *head);
+void netlbl_af4list_remove_entry(struct netlbl_af4list *entry);
+struct netlbl_af4list *netlbl_af4list_search(__be32 addr,
+					     struct list_head *head);
+struct netlbl_af4list *netlbl_af4list_search_exact(__be32 addr,
+						   __be32 mask,
+						   struct list_head *head);
+
+#ifdef CONFIG_AUDIT
+void netlbl_af4list_audit_addr(struct audit_buffer *audit_buf,
+			       int src, const char *dev,
+			       __be32 addr, __be32 mask);
+#else
+static inline void netlbl_af4list_audit_addr(struct audit_buffer *audit_buf,
+					     int src, const char *dev,
+					     __be32 addr, __be32 mask)
+{
+}
+#endif
+
+#if IS_ENABLED(CONFIG_IPV6)
+
+#define __af6list_entry(ptr) container_of(ptr, struct netlbl_af6list, list)
+
+static inline struct netlbl_af6list *__af6list_valid(struct list_head *s,
+						     struct list_head *h)
+{
+	struct list_head *i = s;
+	struct netlbl_af6list *n = __af6list_entry(s);
+	while (i != h && !n->valid) {
+		i = i->next;
+		n = __af6list_entry(i);
+	}
+	return n;
+}
+
+static inline struct netlbl_af6list *__af6list_valid_rcu(struct list_head *s,
+							 struct list_head *h)
+{
+	struct list_head *i = s;
+	struct netlbl_af6list *n = __af6list_entry(s);
+	while (i != h && !n->valid) {
+		i = rcu_dereference(list_next_rcu(i));
+		n = __af6list_entry(i);
+	}
+	return n;
+}
+
+#define netlbl_af6list_foreach(iter, head)				\
+	for (iter = __af6list_valid((head)->next, head);		\
+	     &iter->list != (head);					\
+	     iter = __af6list_valid(iter->list.next, head))
+
+#define netlbl_af6list_foreach_rcu(iter, head)				\
+	for (iter = __af6list_valid_rcu((head)->next, head);		\
+	     &iter->list != (head);					\
+	     iter = __af6list_valid_rcu(iter->list.next, head))
+
+#define netlbl_af6list_foreach_safe(iter, tmp, head)			\
+	for (iter = __af6list_valid((head)->next, head),		\
+		     tmp = __af6list_valid(iter->list.next, head);	\
+	     &iter->list != (head);					\
+	     iter = tmp, tmp = __af6list_valid(iter->list.next, head))
+
+int netlbl_af6list_add(struct netlbl_af6list *entry,
+		       struct list_head *head);
+struct netlbl_af6list *netlbl_af6list_remove(const struct in6_addr *addr,
+					     const struct in6_addr *mask,
+					     struct list_head *head);
+void netlbl_af6list_remove_entry(struct netlbl_af6list *entry);
+struct netlbl_af6list *netlbl_af6list_search(const struct in6_addr *addr,
+					     struct list_head *head);
+struct netlbl_af6list *netlbl_af6list_search_exact(const struct in6_addr *addr,
+						   const struct in6_addr *mask,
+						   struct list_head *head);
+
+#ifdef CONFIG_AUDIT
+void netlbl_af6list_audit_addr(struct audit_buffer *audit_buf,
+			       int src,
+			       const char *dev,
+			       const struct in6_addr *addr,
+			       const struct in6_addr *mask);
+#else
+static inline void netlbl_af6list_audit_addr(struct audit_buffer *audit_buf,
+					     int src,
+					     const char *dev,
+					     const struct in6_addr *addr,
+					     const struct in6_addr *mask)
+{
+}
+#endif
+#endif /* IPV6 */
+
+#endif
diff --git a/net/netlabel/netlabel_calipso.c b/net/netlabel/netlabel_calipso.c
new file mode 100644
index 000000000..84ef4a298
--- /dev/null
+++ b/net/netlabel/netlabel_calipso.c
@@ -0,0 +1,734 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * NetLabel CALIPSO/IPv6 Support
+ *
+ * This file defines the CALIPSO/IPv6 functions for the NetLabel system.  The
+ * NetLabel system manages static and dynamic label mappings for network
+ * protocols such as CIPSO and CALIPSO.
+ *
+ * Authors: Paul Moore <paul@paul-moore.com>
+ *          Huw Davies <huw@codeweavers.com>
+ */
+
+/* (c) Copyright Hewlett-Packard Development Company, L.P., 2006
+ * (c) Copyright Huw Davies <huw@codeweavers.com>, 2015
+ */
+
+#include <linux/types.h>
+#include <linux/socket.h>
+#include <linux/string.h>
+#include <linux/skbuff.h>
+#include <linux/audit.h>
+#include <linux/slab.h>
+#include <net/sock.h>
+#include <net/netlink.h>
+#include <net/genetlink.h>
+#include <net/netlabel.h>
+#include <net/calipso.h>
+#include <linux/atomic.h>
+
+#include "netlabel_user.h"
+#include "netlabel_calipso.h"
+#include "netlabel_mgmt.h"
+#include "netlabel_domainhash.h"
+
+/* Argument struct for calipso_doi_walk() */
+struct netlbl_calipso_doiwalk_arg {
+	struct netlink_callback *nl_cb;
+	struct sk_buff *skb;
+	u32 seq;
+};
+
+/* Argument struct for netlbl_domhsh_walk() */
+struct netlbl_domhsh_walk_arg {
+	struct netlbl_audit *audit_info;
+	u32 doi;
+};
+
+/* NetLabel Generic NETLINK CALIPSO family */
+static struct genl_family netlbl_calipso_gnl_family;
+
+/* NetLabel Netlink attribute policy */
+static const struct nla_policy calipso_genl_policy[NLBL_CALIPSO_A_MAX + 1] = {
+	[NLBL_CALIPSO_A_DOI] = { .type = NLA_U32 },
+	[NLBL_CALIPSO_A_MTYPE] = { .type = NLA_U32 },
+};
+
+static const struct netlbl_calipso_ops *calipso_ops;
+
+/**
+ * netlbl_calipso_ops_register - Register the CALIPSO operations
+ * @ops: ops to register
+ *
+ * Description:
+ * Register the CALIPSO packet engine operations.
+ *
+ */
+const struct netlbl_calipso_ops *
+netlbl_calipso_ops_register(const struct netlbl_calipso_ops *ops)
+{
+	return xchg(&calipso_ops, ops);
+}
+EXPORT_SYMBOL(netlbl_calipso_ops_register);
+
+static const struct netlbl_calipso_ops *netlbl_calipso_ops_get(void)
+{
+	return READ_ONCE(calipso_ops);
+}
+
+/* NetLabel Command Handlers
+ */
+/**
+ * netlbl_calipso_add_pass - Adds a CALIPSO pass DOI definition
+ * @info: the Generic NETLINK info block
+ * @audit_info: NetLabel audit information
+ *
+ * Description:
+ * Create a new CALIPSO_MAP_PASS DOI definition based on the given ADD message
+ * and add it to the CALIPSO engine.  Return zero on success and non-zero on
+ * error.
+ *
+ */
+static int netlbl_calipso_add_pass(struct genl_info *info,
+				   struct netlbl_audit *audit_info)
+{
+	int ret_val;
+	struct calipso_doi *doi_def = NULL;
+
+	doi_def = kmalloc(sizeof(*doi_def), GFP_KERNEL);
+	if (!doi_def)
+		return -ENOMEM;
+	doi_def->type = CALIPSO_MAP_PASS;
+	doi_def->doi = nla_get_u32(info->attrs[NLBL_CALIPSO_A_DOI]);
+	ret_val = calipso_doi_add(doi_def, audit_info);
+	if (ret_val != 0)
+		calipso_doi_free(doi_def);
+
+	return ret_val;
+}
+
+/**
+ * netlbl_calipso_add - Handle an ADD message
+ * @skb: the NETLINK buffer
+ * @info: the Generic NETLINK info block
+ *
+ * Description:
+ * Create a new DOI definition based on the given ADD message and add it to the
+ * CALIPSO engine.  Returns zero on success, negative values on failure.
+ *
+ */
+static int netlbl_calipso_add(struct sk_buff *skb, struct genl_info *info)
+{
+	int ret_val = -EINVAL;
+	struct netlbl_audit audit_info;
+	const struct netlbl_calipso_ops *ops = netlbl_calipso_ops_get();
+
+	if (!info->attrs[NLBL_CALIPSO_A_DOI] ||
+	    !info->attrs[NLBL_CALIPSO_A_MTYPE])
+		return -EINVAL;
+
+	if (!ops)
+		return -EOPNOTSUPP;
+
+	netlbl_netlink_auditinfo(&audit_info);
+	switch (nla_get_u32(info->attrs[NLBL_CALIPSO_A_MTYPE])) {
+	case CALIPSO_MAP_PASS:
+		ret_val = netlbl_calipso_add_pass(info, &audit_info);
+		break;
+	}
+	if (ret_val == 0)
+		atomic_inc(&netlabel_mgmt_protocount);
+
+	return ret_val;
+}
+
+/**
+ * netlbl_calipso_list - Handle a LIST message
+ * @skb: the NETLINK buffer
+ * @info: the Generic NETLINK info block
+ *
+ * Description:
+ * Process a user generated LIST message and respond accordingly.
+ * Returns zero on success and negative values on error.
+ *
+ */
+static int netlbl_calipso_list(struct sk_buff *skb, struct genl_info *info)
+{
+	int ret_val;
+	struct sk_buff *ans_skb = NULL;
+	void *data;
+	u32 doi;
+	struct calipso_doi *doi_def;
+
+	if (!info->attrs[NLBL_CALIPSO_A_DOI]) {
+		ret_val = -EINVAL;
+		goto list_failure;
+	}
+
+	doi = nla_get_u32(info->attrs[NLBL_CALIPSO_A_DOI]);
+
+	doi_def = calipso_doi_getdef(doi);
+	if (!doi_def) {
+		ret_val = -EINVAL;
+		goto list_failure;
+	}
+
+	ans_skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
+	if (!ans_skb) {
+		ret_val = -ENOMEM;
+		goto list_failure_put;
+	}
+	data = genlmsg_put_reply(ans_skb, info, &netlbl_calipso_gnl_family,
+				 0, NLBL_CALIPSO_C_LIST);
+	if (!data) {
+		ret_val = -ENOMEM;
+		goto list_failure_put;
+	}
+
+	ret_val = nla_put_u32(ans_skb, NLBL_CALIPSO_A_MTYPE, doi_def->type);
+	if (ret_val != 0)
+		goto list_failure_put;
+
+	calipso_doi_putdef(doi_def);
+
+	genlmsg_end(ans_skb, data);
+	return genlmsg_reply(ans_skb, info);
+
+list_failure_put:
+	calipso_doi_putdef(doi_def);
+list_failure:
+	kfree_skb(ans_skb);
+	return ret_val;
+}
+
+/**
+ * netlbl_calipso_listall_cb - calipso_doi_walk() callback for LISTALL
+ * @doi_def: the CALIPSO DOI definition
+ * @arg: the netlbl_calipso_doiwalk_arg structure
+ *
+ * Description:
+ * This function is designed to be used as a callback to the
+ * calipso_doi_walk() function for use in generating a response for a LISTALL
+ * message.  Returns the size of the message on success, negative values on
+ * failure.
+ *
+ */
+static int netlbl_calipso_listall_cb(struct calipso_doi *doi_def, void *arg)
+{
+	int ret_val = -ENOMEM;
+	struct netlbl_calipso_doiwalk_arg *cb_arg = arg;
+	void *data;
+
+	data = genlmsg_put(cb_arg->skb, NETLINK_CB(cb_arg->nl_cb->skb).portid,
+			   cb_arg->seq, &netlbl_calipso_gnl_family,
+			   NLM_F_MULTI, NLBL_CALIPSO_C_LISTALL);
+	if (!data)
+		goto listall_cb_failure;
+
+	ret_val = nla_put_u32(cb_arg->skb, NLBL_CALIPSO_A_DOI, doi_def->doi);
+	if (ret_val != 0)
+		goto listall_cb_failure;
+	ret_val = nla_put_u32(cb_arg->skb,
+			      NLBL_CALIPSO_A_MTYPE,
+			      doi_def->type);
+	if (ret_val != 0)
+		goto listall_cb_failure;
+
+	genlmsg_end(cb_arg->skb, data);
+	return 0;
+
+listall_cb_failure:
+	genlmsg_cancel(cb_arg->skb, data);
+	return ret_val;
+}
+
+/**
+ * netlbl_calipso_listall - Handle a LISTALL message
+ * @skb: the NETLINK buffer
+ * @cb: the NETLINK callback
+ *
+ * Description:
+ * Process a user generated LISTALL message and respond accordingly.  Returns
+ * zero on success and negative values on error.
+ *
+ */
+static int netlbl_calipso_listall(struct sk_buff *skb,
+				  struct netlink_callback *cb)
+{
+	struct netlbl_calipso_doiwalk_arg cb_arg;
+	u32 doi_skip = cb->args[0];
+
+	cb_arg.nl_cb = cb;
+	cb_arg.skb = skb;
+	cb_arg.seq = cb->nlh->nlmsg_seq;
+
+	calipso_doi_walk(&doi_skip, netlbl_calipso_listall_cb, &cb_arg);
+
+	cb->args[0] = doi_skip;
+	return skb->len;
+}
+
+/**
+ * netlbl_calipso_remove_cb - netlbl_calipso_remove() callback for REMOVE
+ * @entry: LSM domain mapping entry
+ * @arg: the netlbl_domhsh_walk_arg structure
+ *
+ * Description:
+ * This function is intended for use by netlbl_calipso_remove() as the callback
+ * for the netlbl_domhsh_walk() function; it removes LSM domain map entries
+ * which are associated with the CALIPSO DOI specified in @arg.  Returns zero on
+ * success, negative values on failure.
+ *
+ */
+static int netlbl_calipso_remove_cb(struct netlbl_dom_map *entry, void *arg)
+{
+	struct netlbl_domhsh_walk_arg *cb_arg = arg;
+
+	if (entry->def.type == NETLBL_NLTYPE_CALIPSO &&
+	    entry->def.calipso->doi == cb_arg->doi)
+		return netlbl_domhsh_remove_entry(entry, cb_arg->audit_info);
+
+	return 0;
+}
+
+/**
+ * netlbl_calipso_remove - Handle a REMOVE message
+ * @skb: the NETLINK buffer
+ * @info: the Generic NETLINK info block
+ *
+ * Description:
+ * Process a user generated REMOVE message and respond accordingly.  Returns
+ * zero on success, negative values on failure.
+ *
+ */
+static int netlbl_calipso_remove(struct sk_buff *skb, struct genl_info *info)
+{
+	int ret_val = -EINVAL;
+	struct netlbl_domhsh_walk_arg cb_arg;
+	struct netlbl_audit audit_info;
+	u32 skip_bkt = 0;
+	u32 skip_chain = 0;
+
+	if (!info->attrs[NLBL_CALIPSO_A_DOI])
+		return -EINVAL;
+
+	netlbl_netlink_auditinfo(&audit_info);
+	cb_arg.doi = nla_get_u32(info->attrs[NLBL_CALIPSO_A_DOI]);
+	cb_arg.audit_info = &audit_info;
+	ret_val = netlbl_domhsh_walk(&skip_bkt, &skip_chain,
+				     netlbl_calipso_remove_cb, &cb_arg);
+	if (ret_val == 0 || ret_val == -ENOENT) {
+		ret_val = calipso_doi_remove(cb_arg.doi, &audit_info);
+		if (ret_val == 0)
+			atomic_dec(&netlabel_mgmt_protocount);
+	}
+
+	return ret_val;
+}
+
+/* NetLabel Generic NETLINK Command Definitions
+ */
+
+static const struct genl_small_ops netlbl_calipso_ops[] = {
+	{
+	.cmd = NLBL_CALIPSO_C_ADD,
+	.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
+	.flags = GENL_ADMIN_PERM,
+	.doit = netlbl_calipso_add,
+	.dumpit = NULL,
+	},
+	{
+	.cmd = NLBL_CALIPSO_C_REMOVE,
+	.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
+	.flags = GENL_ADMIN_PERM,
+	.doit = netlbl_calipso_remove,
+	.dumpit = NULL,
+	},
+	{
+	.cmd = NLBL_CALIPSO_C_LIST,
+	.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
+	.flags = 0,
+	.doit = netlbl_calipso_list,
+	.dumpit = NULL,
+	},
+	{
+	.cmd = NLBL_CALIPSO_C_LISTALL,
+	.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
+	.flags = 0,
+	.doit = NULL,
+	.dumpit = netlbl_calipso_listall,
+	},
+};
+
+static struct genl_family netlbl_calipso_gnl_family __ro_after_init = {
+	.hdrsize = 0,
+	.name = NETLBL_NLTYPE_CALIPSO_NAME,
+	.version = NETLBL_PROTO_VERSION,
+	.maxattr = NLBL_CALIPSO_A_MAX,
+	.policy = calipso_genl_policy,
+	.module = THIS_MODULE,
+	.small_ops = netlbl_calipso_ops,
+	.n_small_ops = ARRAY_SIZE(netlbl_calipso_ops),
+};
+
+/* NetLabel Generic NETLINK Protocol Functions
+ */
+
+/**
+ * netlbl_calipso_genl_init - Register the CALIPSO NetLabel component
+ *
+ * Description:
+ * Register the CALIPSO packet NetLabel component with the Generic NETLINK
+ * mechanism.  Returns zero on success, negative values on failure.
+ *
+ */
+int __init netlbl_calipso_genl_init(void)
+{
+	return genl_register_family(&netlbl_calipso_gnl_family);
+}
+
+/**
+ * calipso_doi_add - Add a new DOI to the CALIPSO protocol engine
+ * @doi_def: the DOI structure
+ * @audit_info: NetLabel audit information
+ *
+ * Description:
+ * The caller defines a new DOI for use by the CALIPSO engine and calls this
+ * function to add it to the list of acceptable domains.  The caller must
+ * ensure that the mapping table specified in @doi_def->map meets all of the
+ * requirements of the mapping type (see calipso.h for details).  Returns
+ * zero on success and non-zero on failure.
+ *
+ */
+int calipso_doi_add(struct calipso_doi *doi_def,
+		    struct netlbl_audit *audit_info)
+{
+	int ret_val = -ENOMSG;
+	const struct netlbl_calipso_ops *ops = netlbl_calipso_ops_get();
+
+	if (ops)
+		ret_val = ops->doi_add(doi_def, audit_info);
+	return ret_val;
+}
+
+/**
+ * calipso_doi_free - Frees a DOI definition
+ * @doi_def: the DOI definition
+ *
+ * Description:
+ * This function frees all of the memory associated with a DOI definition.
+ *
+ */
+void calipso_doi_free(struct calipso_doi *doi_def)
+{
+	const struct netlbl_calipso_ops *ops = netlbl_calipso_ops_get();
+
+	if (ops)
+		ops->doi_free(doi_def);
+}
+
+/**
+ * calipso_doi_remove - Remove an existing DOI from the CALIPSO protocol engine
+ * @doi: the DOI value
+ * @audit_info: NetLabel audit information
+ *
+ * Description:
+ * Removes a DOI definition from the CALIPSO engine.  The NetLabel routines will
+ * be called to release their own LSM domain mappings as well as our own
+ * domain list.  Returns zero on success and negative values on failure.
+ *
+ */
+int calipso_doi_remove(u32 doi, struct netlbl_audit *audit_info)
+{
+	int ret_val = -ENOMSG;
+	const struct netlbl_calipso_ops *ops = netlbl_calipso_ops_get();
+
+	if (ops)
+		ret_val = ops->doi_remove(doi, audit_info);
+	return ret_val;
+}
+
+/**
+ * calipso_doi_getdef - Returns a reference to a valid DOI definition
+ * @doi: the DOI value
+ *
+ * Description:
+ * Searches for a valid DOI definition and if one is found it is returned to
+ * the caller.  Otherwise NULL is returned.  The caller must ensure that
+ * calipso_doi_putdef() is called when the caller is done.
+ *
+ */
+struct calipso_doi *calipso_doi_getdef(u32 doi)
+{
+	struct calipso_doi *ret_val = NULL;
+	const struct netlbl_calipso_ops *ops = netlbl_calipso_ops_get();
+
+	if (ops)
+		ret_val = ops->doi_getdef(doi);
+	return ret_val;
+}
+
+/**
+ * calipso_doi_putdef - Releases a reference for the given DOI definition
+ * @doi_def: the DOI definition
+ *
+ * Description:
+ * Releases a DOI definition reference obtained from calipso_doi_getdef().
+ *
+ */
+void calipso_doi_putdef(struct calipso_doi *doi_def)
+{
+	const struct netlbl_calipso_ops *ops = netlbl_calipso_ops_get();
+
+	if (ops)
+		ops->doi_putdef(doi_def);
+}
+
+/**
+ * calipso_doi_walk - Iterate through the DOI definitions
+ * @skip_cnt: skip past this number of DOI definitions, updated
+ * @callback: callback for each DOI definition
+ * @cb_arg: argument for the callback function
+ *
+ * Description:
+ * Iterate over the DOI definition list, skipping the first @skip_cnt entries.
+ * For each entry call @callback, if @callback returns a negative value stop
+ * 'walking' through the list and return.  Updates the value in @skip_cnt upon
+ * return.  Returns zero on success, negative values on failure.
+ *
+ */
+int calipso_doi_walk(u32 *skip_cnt,
+		     int (*callback)(struct calipso_doi *doi_def, void *arg),
+		     void *cb_arg)
+{
+	int ret_val = -ENOMSG;
+	const struct netlbl_calipso_ops *ops = netlbl_calipso_ops_get();
+
+	if (ops)
+		ret_val = ops->doi_walk(skip_cnt, callback, cb_arg);
+	return ret_val;
+}
+
+/**
+ * calipso_sock_getattr - Get the security attributes from a sock
+ * @sk: the sock
+ * @secattr: the security attributes
+ *
+ * Description:
+ * Query @sk to see if there is a CALIPSO option attached to the sock and if
+ * there is return the CALIPSO security attributes in @secattr.  This function
+ * requires that @sk be locked, or privately held, but it does not do any
+ * locking itself.  Returns zero on success and negative values on failure.
+ *
+ */
+int calipso_sock_getattr(struct sock *sk, struct netlbl_lsm_secattr *secattr)
+{
+	int ret_val = -ENOMSG;
+	const struct netlbl_calipso_ops *ops = netlbl_calipso_ops_get();
+
+	if (ops)
+		ret_val = ops->sock_getattr(sk, secattr);
+	return ret_val;
+}
+
+/**
+ * calipso_sock_setattr - Add a CALIPSO option to a socket
+ * @sk: the socket
+ * @doi_def: the CALIPSO DOI to use
+ * @secattr: the specific security attributes of the socket
+ *
+ * Description:
+ * Set the CALIPSO option on the given socket using the DOI definition and
+ * security attributes passed to the function.  This function requires
+ * exclusive access to @sk, which means it either needs to be in the
+ * process of being created or locked.  Returns zero on success and negative
+ * values on failure.
+ *
+ */
+int calipso_sock_setattr(struct sock *sk,
+			 const struct calipso_doi *doi_def,
+			 const struct netlbl_lsm_secattr *secattr)
+{
+	int ret_val = -ENOMSG;
+	const struct netlbl_calipso_ops *ops = netlbl_calipso_ops_get();
+
+	if (ops)
+		ret_val = ops->sock_setattr(sk, doi_def, secattr);
+	return ret_val;
+}
+
+/**
+ * calipso_sock_delattr - Delete the CALIPSO option from a socket
+ * @sk: the socket
+ *
+ * Description:
+ * Removes the CALIPSO option from a socket, if present.
+ *
+ */
+void calipso_sock_delattr(struct sock *sk)
+{
+	const struct netlbl_calipso_ops *ops = netlbl_calipso_ops_get();
+
+	if (ops)
+		ops->sock_delattr(sk);
+}
+
+/**
+ * calipso_req_setattr - Add a CALIPSO option to a connection request socket
+ * @req: the connection request socket
+ * @doi_def: the CALIPSO DOI to use
+ * @secattr: the specific security attributes of the socket
+ *
+ * Description:
+ * Set the CALIPSO option on the given socket using the DOI definition and
+ * security attributes passed to the function.  Returns zero on success and
+ * negative values on failure.
+ *
+ */
+int calipso_req_setattr(struct request_sock *req,
+			const struct calipso_doi *doi_def,
+			const struct netlbl_lsm_secattr *secattr)
+{
+	int ret_val = -ENOMSG;
+	const struct netlbl_calipso_ops *ops = netlbl_calipso_ops_get();
+
+	if (ops)
+		ret_val = ops->req_setattr(req, doi_def, secattr);
+	return ret_val;
+}
+
+/**
+ * calipso_req_delattr - Delete the CALIPSO option from a request socket
+ * @req: the request socket
+ *
+ * Description:
+ * Removes the CALIPSO option from a request socket, if present.
+ *
+ */
+void calipso_req_delattr(struct request_sock *req)
+{
+	const struct netlbl_calipso_ops *ops = netlbl_calipso_ops_get();
+
+	if (ops)
+		ops->req_delattr(req);
+}
+
+/**
+ * calipso_optptr - Find the CALIPSO option in the packet
+ * @skb: the packet
+ *
+ * Description:
+ * Parse the packet's IP header looking for a CALIPSO option.  Returns a pointer
+ * to the start of the CALIPSO option on success, NULL if one if not found.
+ *
+ */
+unsigned char *calipso_optptr(const struct sk_buff *skb)
+{
+	unsigned char *ret_val = NULL;
+	const struct netlbl_calipso_ops *ops = netlbl_calipso_ops_get();
+
+	if (ops)
+		ret_val = ops->skbuff_optptr(skb);
+	return ret_val;
+}
+
+/**
+ * calipso_getattr - Get the security attributes from a memory block.
+ * @calipso: the CALIPSO option
+ * @secattr: the security attributes
+ *
+ * Description:
+ * Inspect @calipso and return the security attributes in @secattr.
+ * Returns zero on success and negative values on failure.
+ *
+ */
+int calipso_getattr(const unsigned char *calipso,
+		    struct netlbl_lsm_secattr *secattr)
+{
+	int ret_val = -ENOMSG;
+	const struct netlbl_calipso_ops *ops = netlbl_calipso_ops_get();
+
+	if (ops)
+		ret_val = ops->opt_getattr(calipso, secattr);
+	return ret_val;
+}
+
+/**
+ * calipso_skbuff_setattr - Set the CALIPSO option on a packet
+ * @skb: the packet
+ * @doi_def: the CALIPSO DOI to use
+ * @secattr: the security attributes
+ *
+ * Description:
+ * Set the CALIPSO option on the given packet based on the security attributes.
+ * Returns a pointer to the IP header on success and NULL on failure.
+ *
+ */
+int calipso_skbuff_setattr(struct sk_buff *skb,
+			   const struct calipso_doi *doi_def,
+			   const struct netlbl_lsm_secattr *secattr)
+{
+	int ret_val = -ENOMSG;
+	const struct netlbl_calipso_ops *ops = netlbl_calipso_ops_get();
+
+	if (ops)
+		ret_val = ops->skbuff_setattr(skb, doi_def, secattr);
+	return ret_val;
+}
+
+/**
+ * calipso_skbuff_delattr - Delete any CALIPSO options from a packet
+ * @skb: the packet
+ *
+ * Description:
+ * Removes any and all CALIPSO options from the given packet.  Returns zero on
+ * success, negative values on failure.
+ *
+ */
+int calipso_skbuff_delattr(struct sk_buff *skb)
+{
+	int ret_val = -ENOMSG;
+	const struct netlbl_calipso_ops *ops = netlbl_calipso_ops_get();
+
+	if (ops)
+		ret_val = ops->skbuff_delattr(skb);
+	return ret_val;
+}
+
+/**
+ * calipso_cache_invalidate - Invalidates the current CALIPSO cache
+ *
+ * Description:
+ * Invalidates and frees any entries in the CALIPSO cache.  Returns zero on
+ * success and negative values on failure.
+ *
+ */
+void calipso_cache_invalidate(void)
+{
+	const struct netlbl_calipso_ops *ops = netlbl_calipso_ops_get();
+
+	if (ops)
+		ops->cache_invalidate();
+}
+
+/**
+ * calipso_cache_add - Add an entry to the CALIPSO cache
+ * @calipso_ptr: the CALIPSO option
+ * @secattr: the packet's security attributes
+ *
+ * Description:
+ * Add a new entry into the CALIPSO label mapping cache.
+ * Returns zero on success, negative values on failure.
+ *
+ */
+int calipso_cache_add(const unsigned char *calipso_ptr,
+		      const struct netlbl_lsm_secattr *secattr)
+
+{
+	int ret_val = -ENOMSG;
+	const struct netlbl_calipso_ops *ops = netlbl_calipso_ops_get();
+
+	if (ops)
+		ret_val = ops->cache_add(calipso_ptr, secattr);
+	return ret_val;
+}
diff --git a/net/netlabel/netlabel_calipso.h b/net/netlabel/netlabel_calipso.h
new file mode 100644
index 000000000..ef3e9a7ab
--- /dev/null
+++ b/net/netlabel/netlabel_calipso.h
@@ -0,0 +1,137 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * NetLabel CALIPSO Support
+ *
+ * This file defines the CALIPSO functions for the NetLabel system.  The
+ * NetLabel system manages static and dynamic label mappings for network
+ * protocols such as CIPSO and RIPSO.
+ *
+ * Authors: Paul Moore <paul@paul-moore.com>
+ *          Huw Davies <huw@codeweavers.com>
+ */
+
+/* (c) Copyright Hewlett-Packard Development Company, L.P., 2006
+ * (c) Copyright Huw Davies <huw@codeweavers.com>, 2015
+ */
+
+#ifndef _NETLABEL_CALIPSO
+#define _NETLABEL_CALIPSO
+
+#include <net/netlabel.h>
+#include <net/calipso.h>
+
+/* The following NetLabel payloads are supported by the CALIPSO subsystem.
+ *
+ * o ADD:
+ *   Sent by an application to add a new DOI mapping table.
+ *
+ *   Required attributes:
+ *
+ *     NLBL_CALIPSO_A_DOI
+ *     NLBL_CALIPSO_A_MTYPE
+ *
+ *   If using CALIPSO_MAP_PASS no additional attributes are required.
+ *
+ * o REMOVE:
+ *   Sent by an application to remove a specific DOI mapping table from the
+ *   CALIPSO system.
+ *
+ *   Required attributes:
+ *
+ *     NLBL_CALIPSO_A_DOI
+ *
+ * o LIST:
+ *   Sent by an application to list the details of a DOI definition.  On
+ *   success the kernel should send a response using the following format.
+ *
+ *   Required attributes:
+ *
+ *     NLBL_CALIPSO_A_DOI
+ *
+ *   The valid response message format depends on the type of the DOI mapping,
+ *   the defined formats are shown below.
+ *
+ *   Required attributes:
+ *
+ *     NLBL_CALIPSO_A_MTYPE
+ *
+ *   If using CALIPSO_MAP_PASS no additional attributes are required.
+ *
+ * o LISTALL:
+ *   This message is sent by an application to list the valid DOIs on the
+ *   system.  When sent by an application there is no payload and the
+ *   NLM_F_DUMP flag should be set.  The kernel should respond with a series of
+ *   the following messages.
+ *
+ *   Required attributes:
+ *
+ *    NLBL_CALIPSO_A_DOI
+ *    NLBL_CALIPSO_A_MTYPE
+ *
+ */
+
+/* NetLabel CALIPSO commands */
+enum {
+	NLBL_CALIPSO_C_UNSPEC,
+	NLBL_CALIPSO_C_ADD,
+	NLBL_CALIPSO_C_REMOVE,
+	NLBL_CALIPSO_C_LIST,
+	NLBL_CALIPSO_C_LISTALL,
+	__NLBL_CALIPSO_C_MAX,
+};
+
+/* NetLabel CALIPSO attributes */
+enum {
+	NLBL_CALIPSO_A_UNSPEC,
+	NLBL_CALIPSO_A_DOI,
+	/* (NLA_U32)
+	 * the DOI value */
+	NLBL_CALIPSO_A_MTYPE,
+	/* (NLA_U32)
+	 * the mapping table type (defined in the calipso.h header as
+	 * CALIPSO_MAP_*) */
+	__NLBL_CALIPSO_A_MAX,
+};
+
+#define NLBL_CALIPSO_A_MAX (__NLBL_CALIPSO_A_MAX - 1)
+
+/* NetLabel protocol functions */
+#if IS_ENABLED(CONFIG_IPV6)
+int netlbl_calipso_genl_init(void);
+#else
+static inline int netlbl_calipso_genl_init(void)
+{
+	return 0;
+}
+#endif
+
+int calipso_doi_add(struct calipso_doi *doi_def,
+		    struct netlbl_audit *audit_info);
+void calipso_doi_free(struct calipso_doi *doi_def);
+int calipso_doi_remove(u32 doi, struct netlbl_audit *audit_info);
+struct calipso_doi *calipso_doi_getdef(u32 doi);
+void calipso_doi_putdef(struct calipso_doi *doi_def);
+int calipso_doi_walk(u32 *skip_cnt,
+		     int (*callback)(struct calipso_doi *doi_def, void *arg),
+		     void *cb_arg);
+int calipso_sock_getattr(struct sock *sk, struct netlbl_lsm_secattr *secattr);
+int calipso_sock_setattr(struct sock *sk,
+			 const struct calipso_doi *doi_def,
+			 const struct netlbl_lsm_secattr *secattr);
+void calipso_sock_delattr(struct sock *sk);
+int calipso_req_setattr(struct request_sock *req,
+			const struct calipso_doi *doi_def,
+			const struct netlbl_lsm_secattr *secattr);
+void calipso_req_delattr(struct request_sock *req);
+unsigned char *calipso_optptr(const struct sk_buff *skb);
+int calipso_getattr(const unsigned char *calipso,
+		    struct netlbl_lsm_secattr *secattr);
+int calipso_skbuff_setattr(struct sk_buff *skb,
+			   const struct calipso_doi *doi_def,
+			   const struct netlbl_lsm_secattr *secattr);
+int calipso_skbuff_delattr(struct sk_buff *skb);
+void calipso_cache_invalidate(void);
+int calipso_cache_add(const unsigned char *calipso_ptr,
+		      const struct netlbl_lsm_secattr *secattr);
+
+#endif
diff --git a/net/netlabel/netlabel_cipso_v4.c b/net/netlabel/netlabel_cipso_v4.c
new file mode 100644
index 000000000..894e6b8f1
--- /dev/null
+++ b/net/netlabel/netlabel_cipso_v4.c
@@ -0,0 +1,787 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * NetLabel CIPSO/IPv4 Support
+ *
+ * This file defines the CIPSO/IPv4 functions 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
+ */
+
+#include <linux/types.h>
+#include <linux/socket.h>
+#include <linux/string.h>
+#include <linux/skbuff.h>
+#include <linux/audit.h>
+#include <linux/slab.h>
+#include <net/sock.h>
+#include <net/netlink.h>
+#include <net/genetlink.h>
+#include <net/netlabel.h>
+#include <net/cipso_ipv4.h>
+#include <linux/atomic.h>
+
+#include "netlabel_user.h"
+#include "netlabel_cipso_v4.h"
+#include "netlabel_mgmt.h"
+#include "netlabel_domainhash.h"
+
+/* Argument struct for cipso_v4_doi_walk() */
+struct netlbl_cipsov4_doiwalk_arg {
+	struct netlink_callback *nl_cb;
+	struct sk_buff *skb;
+	u32 seq;
+};
+
+/* Argument struct for netlbl_domhsh_walk() */
+struct netlbl_domhsh_walk_arg {
+	struct netlbl_audit *audit_info;
+	u32 doi;
+};
+
+/* NetLabel Generic NETLINK CIPSOv4 family */
+static struct genl_family netlbl_cipsov4_gnl_family;
+/* NetLabel Netlink attribute policy */
+static const struct nla_policy netlbl_cipsov4_genl_policy[NLBL_CIPSOV4_A_MAX + 1] = {
+	[NLBL_CIPSOV4_A_DOI] = { .type = NLA_U32 },
+	[NLBL_CIPSOV4_A_MTYPE] = { .type = NLA_U32 },
+	[NLBL_CIPSOV4_A_TAG] = { .type = NLA_U8 },
+	[NLBL_CIPSOV4_A_TAGLST] = { .type = NLA_NESTED },
+	[NLBL_CIPSOV4_A_MLSLVLLOC] = { .type = NLA_U32 },
+	[NLBL_CIPSOV4_A_MLSLVLREM] = { .type = NLA_U32 },
+	[NLBL_CIPSOV4_A_MLSLVL] = { .type = NLA_NESTED },
+	[NLBL_CIPSOV4_A_MLSLVLLST] = { .type = NLA_NESTED },
+	[NLBL_CIPSOV4_A_MLSCATLOC] = { .type = NLA_U32 },
+	[NLBL_CIPSOV4_A_MLSCATREM] = { .type = NLA_U32 },
+	[NLBL_CIPSOV4_A_MLSCAT] = { .type = NLA_NESTED },
+	[NLBL_CIPSOV4_A_MLSCATLST] = { .type = NLA_NESTED },
+};
+
+/*
+ * Helper Functions
+ */
+
+/**
+ * netlbl_cipsov4_add_common - Parse the common sections of a ADD message
+ * @info: the Generic NETLINK info block
+ * @doi_def: the CIPSO V4 DOI definition
+ *
+ * Description:
+ * Parse the common sections of a ADD message and fill in the related values
+ * in @doi_def.  Returns zero on success, negative values on failure.
+ *
+ */
+static int netlbl_cipsov4_add_common(struct genl_info *info,
+				     struct cipso_v4_doi *doi_def)
+{
+	struct nlattr *nla;
+	int nla_rem;
+	u32 iter = 0;
+
+	doi_def->doi = nla_get_u32(info->attrs[NLBL_CIPSOV4_A_DOI]);
+
+	if (nla_validate_nested_deprecated(info->attrs[NLBL_CIPSOV4_A_TAGLST],
+					   NLBL_CIPSOV4_A_MAX,
+					   netlbl_cipsov4_genl_policy,
+					   NULL) != 0)
+		return -EINVAL;
+
+	nla_for_each_nested(nla, info->attrs[NLBL_CIPSOV4_A_TAGLST], nla_rem)
+		if (nla_type(nla) == NLBL_CIPSOV4_A_TAG) {
+			if (iter >= CIPSO_V4_TAG_MAXCNT)
+				return -EINVAL;
+			doi_def->tags[iter++] = nla_get_u8(nla);
+		}
+	while (iter < CIPSO_V4_TAG_MAXCNT)
+		doi_def->tags[iter++] = CIPSO_V4_TAG_INVALID;
+
+	return 0;
+}
+
+/*
+ * NetLabel Command Handlers
+ */
+
+/**
+ * netlbl_cipsov4_add_std - Adds a CIPSO V4 DOI definition
+ * @info: the Generic NETLINK info block
+ * @audit_info: NetLabel audit information
+ *
+ * Description:
+ * Create a new CIPSO_V4_MAP_TRANS DOI definition based on the given ADD
+ * message and add it to the CIPSO V4 engine.  Return zero on success and
+ * non-zero on error.
+ *
+ */
+static int netlbl_cipsov4_add_std(struct genl_info *info,
+				  struct netlbl_audit *audit_info)
+{
+	int ret_val = -EINVAL;
+	struct cipso_v4_doi *doi_def = NULL;
+	struct nlattr *nla_a;
+	struct nlattr *nla_b;
+	int nla_a_rem;
+	int nla_b_rem;
+	u32 iter;
+
+	if (!info->attrs[NLBL_CIPSOV4_A_TAGLST] ||
+	    !info->attrs[NLBL_CIPSOV4_A_MLSLVLLST])
+		return -EINVAL;
+
+	if (nla_validate_nested_deprecated(info->attrs[NLBL_CIPSOV4_A_MLSLVLLST],
+					   NLBL_CIPSOV4_A_MAX,
+					   netlbl_cipsov4_genl_policy,
+					   NULL) != 0)
+		return -EINVAL;
+
+	doi_def = kmalloc(sizeof(*doi_def), GFP_KERNEL);
+	if (doi_def == NULL)
+		return -ENOMEM;
+	doi_def->map.std = kzalloc(sizeof(*doi_def->map.std), GFP_KERNEL);
+	if (doi_def->map.std == NULL) {
+		kfree(doi_def);
+		return -ENOMEM;
+	}
+	doi_def->type = CIPSO_V4_MAP_TRANS;
+
+	ret_val = netlbl_cipsov4_add_common(info, doi_def);
+	if (ret_val != 0)
+		goto add_std_failure;
+	ret_val = -EINVAL;
+
+	nla_for_each_nested(nla_a,
+			    info->attrs[NLBL_CIPSOV4_A_MLSLVLLST],
+			    nla_a_rem)
+		if (nla_type(nla_a) == NLBL_CIPSOV4_A_MLSLVL) {
+			if (nla_validate_nested_deprecated(nla_a,
+							   NLBL_CIPSOV4_A_MAX,
+							   netlbl_cipsov4_genl_policy,
+							   NULL) != 0)
+				goto add_std_failure;
+			nla_for_each_nested(nla_b, nla_a, nla_b_rem)
+				switch (nla_type(nla_b)) {
+				case NLBL_CIPSOV4_A_MLSLVLLOC:
+					if (nla_get_u32(nla_b) >
+					    CIPSO_V4_MAX_LOC_LVLS)
+						goto add_std_failure;
+					if (nla_get_u32(nla_b) >=
+					    doi_def->map.std->lvl.local_size)
+					     doi_def->map.std->lvl.local_size =
+						     nla_get_u32(nla_b) + 1;
+					break;
+				case NLBL_CIPSOV4_A_MLSLVLREM:
+					if (nla_get_u32(nla_b) >
+					    CIPSO_V4_MAX_REM_LVLS)
+						goto add_std_failure;
+					if (nla_get_u32(nla_b) >=
+					    doi_def->map.std->lvl.cipso_size)
+					     doi_def->map.std->lvl.cipso_size =
+						     nla_get_u32(nla_b) + 1;
+					break;
+				}
+		}
+	doi_def->map.std->lvl.local = kcalloc(doi_def->map.std->lvl.local_size,
+					      sizeof(u32),
+					      GFP_KERNEL | __GFP_NOWARN);
+	if (doi_def->map.std->lvl.local == NULL) {
+		ret_val = -ENOMEM;
+		goto add_std_failure;
+	}
+	doi_def->map.std->lvl.cipso = kcalloc(doi_def->map.std->lvl.cipso_size,
+					      sizeof(u32),
+					      GFP_KERNEL | __GFP_NOWARN);
+	if (doi_def->map.std->lvl.cipso == NULL) {
+		ret_val = -ENOMEM;
+		goto add_std_failure;
+	}
+	for (iter = 0; iter < doi_def->map.std->lvl.local_size; iter++)
+		doi_def->map.std->lvl.local[iter] = CIPSO_V4_INV_LVL;
+	for (iter = 0; iter < doi_def->map.std->lvl.cipso_size; iter++)
+		doi_def->map.std->lvl.cipso[iter] = CIPSO_V4_INV_LVL;
+	nla_for_each_nested(nla_a,
+			    info->attrs[NLBL_CIPSOV4_A_MLSLVLLST],
+			    nla_a_rem)
+		if (nla_type(nla_a) == NLBL_CIPSOV4_A_MLSLVL) {
+			struct nlattr *lvl_loc;
+			struct nlattr *lvl_rem;
+
+			lvl_loc = nla_find_nested(nla_a,
+						  NLBL_CIPSOV4_A_MLSLVLLOC);
+			lvl_rem = nla_find_nested(nla_a,
+						  NLBL_CIPSOV4_A_MLSLVLREM);
+			if (lvl_loc == NULL || lvl_rem == NULL)
+				goto add_std_failure;
+			doi_def->map.std->lvl.local[nla_get_u32(lvl_loc)] =
+				nla_get_u32(lvl_rem);
+			doi_def->map.std->lvl.cipso[nla_get_u32(lvl_rem)] =
+				nla_get_u32(lvl_loc);
+		}
+
+	if (info->attrs[NLBL_CIPSOV4_A_MLSCATLST]) {
+		if (nla_validate_nested_deprecated(info->attrs[NLBL_CIPSOV4_A_MLSCATLST],
+						   NLBL_CIPSOV4_A_MAX,
+						   netlbl_cipsov4_genl_policy,
+						   NULL) != 0)
+			goto add_std_failure;
+
+		nla_for_each_nested(nla_a,
+				    info->attrs[NLBL_CIPSOV4_A_MLSCATLST],
+				    nla_a_rem)
+			if (nla_type(nla_a) == NLBL_CIPSOV4_A_MLSCAT) {
+				if (nla_validate_nested_deprecated(nla_a,
+								   NLBL_CIPSOV4_A_MAX,
+								   netlbl_cipsov4_genl_policy,
+								   NULL) != 0)
+					goto add_std_failure;
+				nla_for_each_nested(nla_b, nla_a, nla_b_rem)
+					switch (nla_type(nla_b)) {
+					case NLBL_CIPSOV4_A_MLSCATLOC:
+						if (nla_get_u32(nla_b) >
+						    CIPSO_V4_MAX_LOC_CATS)
+							goto add_std_failure;
+						if (nla_get_u32(nla_b) >=
+					      doi_def->map.std->cat.local_size)
+					     doi_def->map.std->cat.local_size =
+						     nla_get_u32(nla_b) + 1;
+						break;
+					case NLBL_CIPSOV4_A_MLSCATREM:
+						if (nla_get_u32(nla_b) >
+						    CIPSO_V4_MAX_REM_CATS)
+							goto add_std_failure;
+						if (nla_get_u32(nla_b) >=
+					      doi_def->map.std->cat.cipso_size)
+					     doi_def->map.std->cat.cipso_size =
+						     nla_get_u32(nla_b) + 1;
+						break;
+					}
+			}
+		doi_def->map.std->cat.local = kcalloc(
+					      doi_def->map.std->cat.local_size,
+					      sizeof(u32),
+					      GFP_KERNEL | __GFP_NOWARN);
+		if (doi_def->map.std->cat.local == NULL) {
+			ret_val = -ENOMEM;
+			goto add_std_failure;
+		}
+		doi_def->map.std->cat.cipso = kcalloc(
+					      doi_def->map.std->cat.cipso_size,
+					      sizeof(u32),
+					      GFP_KERNEL | __GFP_NOWARN);
+		if (doi_def->map.std->cat.cipso == NULL) {
+			ret_val = -ENOMEM;
+			goto add_std_failure;
+		}
+		for (iter = 0; iter < doi_def->map.std->cat.local_size; iter++)
+			doi_def->map.std->cat.local[iter] = CIPSO_V4_INV_CAT;
+		for (iter = 0; iter < doi_def->map.std->cat.cipso_size; iter++)
+			doi_def->map.std->cat.cipso[iter] = CIPSO_V4_INV_CAT;
+		nla_for_each_nested(nla_a,
+				    info->attrs[NLBL_CIPSOV4_A_MLSCATLST],
+				    nla_a_rem)
+			if (nla_type(nla_a) == NLBL_CIPSOV4_A_MLSCAT) {
+				struct nlattr *cat_loc;
+				struct nlattr *cat_rem;
+
+				cat_loc = nla_find_nested(nla_a,
+						     NLBL_CIPSOV4_A_MLSCATLOC);
+				cat_rem = nla_find_nested(nla_a,
+						     NLBL_CIPSOV4_A_MLSCATREM);
+				if (cat_loc == NULL || cat_rem == NULL)
+					goto add_std_failure;
+				doi_def->map.std->cat.local[
+							nla_get_u32(cat_loc)] =
+					nla_get_u32(cat_rem);
+				doi_def->map.std->cat.cipso[
+							nla_get_u32(cat_rem)] =
+					nla_get_u32(cat_loc);
+			}
+	}
+
+	ret_val = cipso_v4_doi_add(doi_def, audit_info);
+	if (ret_val != 0)
+		goto add_std_failure;
+	return 0;
+
+add_std_failure:
+	cipso_v4_doi_free(doi_def);
+	return ret_val;
+}
+
+/**
+ * netlbl_cipsov4_add_pass - Adds a CIPSO V4 DOI definition
+ * @info: the Generic NETLINK info block
+ * @audit_info: NetLabel audit information
+ *
+ * Description:
+ * Create a new CIPSO_V4_MAP_PASS DOI definition based on the given ADD message
+ * and add it to the CIPSO V4 engine.  Return zero on success and non-zero on
+ * error.
+ *
+ */
+static int netlbl_cipsov4_add_pass(struct genl_info *info,
+				   struct netlbl_audit *audit_info)
+{
+	int ret_val;
+	struct cipso_v4_doi *doi_def = NULL;
+
+	if (!info->attrs[NLBL_CIPSOV4_A_TAGLST])
+		return -EINVAL;
+
+	doi_def = kmalloc(sizeof(*doi_def), GFP_KERNEL);
+	if (doi_def == NULL)
+		return -ENOMEM;
+	doi_def->type = CIPSO_V4_MAP_PASS;
+
+	ret_val = netlbl_cipsov4_add_common(info, doi_def);
+	if (ret_val != 0)
+		goto add_pass_failure;
+
+	ret_val = cipso_v4_doi_add(doi_def, audit_info);
+	if (ret_val != 0)
+		goto add_pass_failure;
+	return 0;
+
+add_pass_failure:
+	cipso_v4_doi_free(doi_def);
+	return ret_val;
+}
+
+/**
+ * netlbl_cipsov4_add_local - Adds a CIPSO V4 DOI definition
+ * @info: the Generic NETLINK info block
+ * @audit_info: NetLabel audit information
+ *
+ * Description:
+ * Create a new CIPSO_V4_MAP_LOCAL DOI definition based on the given ADD
+ * message and add it to the CIPSO V4 engine.  Return zero on success and
+ * non-zero on error.
+ *
+ */
+static int netlbl_cipsov4_add_local(struct genl_info *info,
+				    struct netlbl_audit *audit_info)
+{
+	int ret_val;
+	struct cipso_v4_doi *doi_def = NULL;
+
+	if (!info->attrs[NLBL_CIPSOV4_A_TAGLST])
+		return -EINVAL;
+
+	doi_def = kmalloc(sizeof(*doi_def), GFP_KERNEL);
+	if (doi_def == NULL)
+		return -ENOMEM;
+	doi_def->type = CIPSO_V4_MAP_LOCAL;
+
+	ret_val = netlbl_cipsov4_add_common(info, doi_def);
+	if (ret_val != 0)
+		goto add_local_failure;
+
+	ret_val = cipso_v4_doi_add(doi_def, audit_info);
+	if (ret_val != 0)
+		goto add_local_failure;
+	return 0;
+
+add_local_failure:
+	cipso_v4_doi_free(doi_def);
+	return ret_val;
+}
+
+/**
+ * netlbl_cipsov4_add - Handle an ADD message
+ * @skb: the NETLINK buffer
+ * @info: the Generic NETLINK info block
+ *
+ * Description:
+ * Create a new DOI definition based on the given ADD message and add it to the
+ * CIPSO V4 engine.  Returns zero on success, negative values on failure.
+ *
+ */
+static int netlbl_cipsov4_add(struct sk_buff *skb, struct genl_info *info)
+
+{
+	int ret_val = -EINVAL;
+	struct netlbl_audit audit_info;
+
+	if (!info->attrs[NLBL_CIPSOV4_A_DOI] ||
+	    !info->attrs[NLBL_CIPSOV4_A_MTYPE])
+		return -EINVAL;
+
+	netlbl_netlink_auditinfo(&audit_info);
+	switch (nla_get_u32(info->attrs[NLBL_CIPSOV4_A_MTYPE])) {
+	case CIPSO_V4_MAP_TRANS:
+		ret_val = netlbl_cipsov4_add_std(info, &audit_info);
+		break;
+	case CIPSO_V4_MAP_PASS:
+		ret_val = netlbl_cipsov4_add_pass(info, &audit_info);
+		break;
+	case CIPSO_V4_MAP_LOCAL:
+		ret_val = netlbl_cipsov4_add_local(info, &audit_info);
+		break;
+	}
+	if (ret_val == 0)
+		atomic_inc(&netlabel_mgmt_protocount);
+
+	return ret_val;
+}
+
+/**
+ * netlbl_cipsov4_list - Handle a LIST message
+ * @skb: the NETLINK buffer
+ * @info: the Generic NETLINK info block
+ *
+ * Description:
+ * Process a user generated LIST message and respond accordingly.  While the
+ * response message generated by the kernel is straightforward, determining
+ * before hand the size of the buffer to allocate is not (we have to generate
+ * the message to know the size).  In order to keep this function sane what we
+ * do is allocate a buffer of NLMSG_GOODSIZE and try to fit the response in
+ * that size, if we fail then we restart with a larger buffer and try again.
+ * We continue in this manner until we hit a limit of failed attempts then we
+ * give up and just send an error message.  Returns zero on success and
+ * negative values on error.
+ *
+ */
+static int netlbl_cipsov4_list(struct sk_buff *skb, struct genl_info *info)
+{
+	int ret_val;
+	struct sk_buff *ans_skb = NULL;
+	u32 nlsze_mult = 1;
+	void *data;
+	u32 doi;
+	struct nlattr *nla_a;
+	struct nlattr *nla_b;
+	struct cipso_v4_doi *doi_def;
+	u32 iter;
+
+	if (!info->attrs[NLBL_CIPSOV4_A_DOI]) {
+		ret_val = -EINVAL;
+		goto list_failure;
+	}
+
+list_start:
+	ans_skb = nlmsg_new(NLMSG_DEFAULT_SIZE * nlsze_mult, GFP_KERNEL);
+	if (ans_skb == NULL) {
+		ret_val = -ENOMEM;
+		goto list_failure;
+	}
+	data = genlmsg_put_reply(ans_skb, info, &netlbl_cipsov4_gnl_family,
+				 0, NLBL_CIPSOV4_C_LIST);
+	if (data == NULL) {
+		ret_val = -ENOMEM;
+		goto list_failure;
+	}
+
+	doi = nla_get_u32(info->attrs[NLBL_CIPSOV4_A_DOI]);
+
+	rcu_read_lock();
+	doi_def = cipso_v4_doi_getdef(doi);
+	if (doi_def == NULL) {
+		ret_val = -EINVAL;
+		goto list_failure_lock;
+	}
+
+	ret_val = nla_put_u32(ans_skb, NLBL_CIPSOV4_A_MTYPE, doi_def->type);
+	if (ret_val != 0)
+		goto list_failure_lock;
+
+	nla_a = nla_nest_start_noflag(ans_skb, NLBL_CIPSOV4_A_TAGLST);
+	if (nla_a == NULL) {
+		ret_val = -ENOMEM;
+		goto list_failure_lock;
+	}
+	for (iter = 0;
+	     iter < CIPSO_V4_TAG_MAXCNT &&
+	       doi_def->tags[iter] != CIPSO_V4_TAG_INVALID;
+	     iter++) {
+		ret_val = nla_put_u8(ans_skb,
+				     NLBL_CIPSOV4_A_TAG,
+				     doi_def->tags[iter]);
+		if (ret_val != 0)
+			goto list_failure_lock;
+	}
+	nla_nest_end(ans_skb, nla_a);
+
+	switch (doi_def->type) {
+	case CIPSO_V4_MAP_TRANS:
+		nla_a = nla_nest_start_noflag(ans_skb,
+					      NLBL_CIPSOV4_A_MLSLVLLST);
+		if (nla_a == NULL) {
+			ret_val = -ENOMEM;
+			goto list_failure_lock;
+		}
+		for (iter = 0;
+		     iter < doi_def->map.std->lvl.local_size;
+		     iter++) {
+			if (doi_def->map.std->lvl.local[iter] ==
+			    CIPSO_V4_INV_LVL)
+				continue;
+
+			nla_b = nla_nest_start_noflag(ans_skb,
+						      NLBL_CIPSOV4_A_MLSLVL);
+			if (nla_b == NULL) {
+				ret_val = -ENOMEM;
+				goto list_retry;
+			}
+			ret_val = nla_put_u32(ans_skb,
+					      NLBL_CIPSOV4_A_MLSLVLLOC,
+					      iter);
+			if (ret_val != 0)
+				goto list_retry;
+			ret_val = nla_put_u32(ans_skb,
+					    NLBL_CIPSOV4_A_MLSLVLREM,
+					    doi_def->map.std->lvl.local[iter]);
+			if (ret_val != 0)
+				goto list_retry;
+			nla_nest_end(ans_skb, nla_b);
+		}
+		nla_nest_end(ans_skb, nla_a);
+
+		nla_a = nla_nest_start_noflag(ans_skb,
+					      NLBL_CIPSOV4_A_MLSCATLST);
+		if (nla_a == NULL) {
+			ret_val = -ENOMEM;
+			goto list_retry;
+		}
+		for (iter = 0;
+		     iter < doi_def->map.std->cat.local_size;
+		     iter++) {
+			if (doi_def->map.std->cat.local[iter] ==
+			    CIPSO_V4_INV_CAT)
+				continue;
+
+			nla_b = nla_nest_start_noflag(ans_skb,
+						      NLBL_CIPSOV4_A_MLSCAT);
+			if (nla_b == NULL) {
+				ret_val = -ENOMEM;
+				goto list_retry;
+			}
+			ret_val = nla_put_u32(ans_skb,
+					      NLBL_CIPSOV4_A_MLSCATLOC,
+					      iter);
+			if (ret_val != 0)
+				goto list_retry;
+			ret_val = nla_put_u32(ans_skb,
+					    NLBL_CIPSOV4_A_MLSCATREM,
+					    doi_def->map.std->cat.local[iter]);
+			if (ret_val != 0)
+				goto list_retry;
+			nla_nest_end(ans_skb, nla_b);
+		}
+		nla_nest_end(ans_skb, nla_a);
+
+		break;
+	}
+	cipso_v4_doi_putdef(doi_def);
+	rcu_read_unlock();
+
+	genlmsg_end(ans_skb, data);
+	return genlmsg_reply(ans_skb, info);
+
+list_retry:
+	/* XXX - this limit is a guesstimate */
+	if (nlsze_mult < 4) {
+		cipso_v4_doi_putdef(doi_def);
+		rcu_read_unlock();
+		kfree_skb(ans_skb);
+		nlsze_mult *= 2;
+		goto list_start;
+	}
+list_failure_lock:
+	cipso_v4_doi_putdef(doi_def);
+	rcu_read_unlock();
+list_failure:
+	kfree_skb(ans_skb);
+	return ret_val;
+}
+
+/**
+ * netlbl_cipsov4_listall_cb - cipso_v4_doi_walk() callback for LISTALL
+ * @doi_def: the CIPSOv4 DOI definition
+ * @arg: the netlbl_cipsov4_doiwalk_arg structure
+ *
+ * Description:
+ * This function is designed to be used as a callback to the
+ * cipso_v4_doi_walk() function for use in generating a response for a LISTALL
+ * message.  Returns the size of the message on success, negative values on
+ * failure.
+ *
+ */
+static int netlbl_cipsov4_listall_cb(struct cipso_v4_doi *doi_def, void *arg)
+{
+	int ret_val = -ENOMEM;
+	struct netlbl_cipsov4_doiwalk_arg *cb_arg = arg;
+	void *data;
+
+	data = genlmsg_put(cb_arg->skb, NETLINK_CB(cb_arg->nl_cb->skb).portid,
+			   cb_arg->seq, &netlbl_cipsov4_gnl_family,
+			   NLM_F_MULTI, NLBL_CIPSOV4_C_LISTALL);
+	if (data == NULL)
+		goto listall_cb_failure;
+
+	ret_val = nla_put_u32(cb_arg->skb, NLBL_CIPSOV4_A_DOI, doi_def->doi);
+	if (ret_val != 0)
+		goto listall_cb_failure;
+	ret_val = nla_put_u32(cb_arg->skb,
+			      NLBL_CIPSOV4_A_MTYPE,
+			      doi_def->type);
+	if (ret_val != 0)
+		goto listall_cb_failure;
+
+	genlmsg_end(cb_arg->skb, data);
+	return 0;
+
+listall_cb_failure:
+	genlmsg_cancel(cb_arg->skb, data);
+	return ret_val;
+}
+
+/**
+ * netlbl_cipsov4_listall - Handle a LISTALL message
+ * @skb: the NETLINK buffer
+ * @cb: the NETLINK callback
+ *
+ * Description:
+ * Process a user generated LISTALL message and respond accordingly.  Returns
+ * zero on success and negative values on error.
+ *
+ */
+static int netlbl_cipsov4_listall(struct sk_buff *skb,
+				  struct netlink_callback *cb)
+{
+	struct netlbl_cipsov4_doiwalk_arg cb_arg;
+	u32 doi_skip = cb->args[0];
+
+	cb_arg.nl_cb = cb;
+	cb_arg.skb = skb;
+	cb_arg.seq = cb->nlh->nlmsg_seq;
+
+	cipso_v4_doi_walk(&doi_skip, netlbl_cipsov4_listall_cb, &cb_arg);
+
+	cb->args[0] = doi_skip;
+	return skb->len;
+}
+
+/**
+ * netlbl_cipsov4_remove_cb - netlbl_cipsov4_remove() callback for REMOVE
+ * @entry: LSM domain mapping entry
+ * @arg: the netlbl_domhsh_walk_arg structure
+ *
+ * Description:
+ * This function is intended for use by netlbl_cipsov4_remove() as the callback
+ * for the netlbl_domhsh_walk() function; it removes LSM domain map entries
+ * which are associated with the CIPSO DOI specified in @arg.  Returns zero on
+ * success, negative values on failure.
+ *
+ */
+static int netlbl_cipsov4_remove_cb(struct netlbl_dom_map *entry, void *arg)
+{
+	struct netlbl_domhsh_walk_arg *cb_arg = arg;
+
+	if (entry->def.type == NETLBL_NLTYPE_CIPSOV4 &&
+	    entry->def.cipso->doi == cb_arg->doi)
+		return netlbl_domhsh_remove_entry(entry, cb_arg->audit_info);
+
+	return 0;
+}
+
+/**
+ * netlbl_cipsov4_remove - Handle a REMOVE message
+ * @skb: the NETLINK buffer
+ * @info: the Generic NETLINK info block
+ *
+ * Description:
+ * Process a user generated REMOVE message and respond accordingly.  Returns
+ * zero on success, negative values on failure.
+ *
+ */
+static int netlbl_cipsov4_remove(struct sk_buff *skb, struct genl_info *info)
+{
+	int ret_val = -EINVAL;
+	struct netlbl_domhsh_walk_arg cb_arg;
+	struct netlbl_audit audit_info;
+	u32 skip_bkt = 0;
+	u32 skip_chain = 0;
+
+	if (!info->attrs[NLBL_CIPSOV4_A_DOI])
+		return -EINVAL;
+
+	netlbl_netlink_auditinfo(&audit_info);
+	cb_arg.doi = nla_get_u32(info->attrs[NLBL_CIPSOV4_A_DOI]);
+	cb_arg.audit_info = &audit_info;
+	ret_val = netlbl_domhsh_walk(&skip_bkt, &skip_chain,
+				     netlbl_cipsov4_remove_cb, &cb_arg);
+	if (ret_val == 0 || ret_val == -ENOENT) {
+		ret_val = cipso_v4_doi_remove(cb_arg.doi, &audit_info);
+		if (ret_val == 0)
+			atomic_dec(&netlabel_mgmt_protocount);
+	}
+
+	return ret_val;
+}
+
+/*
+ * NetLabel Generic NETLINK Command Definitions
+ */
+
+static const struct genl_small_ops netlbl_cipsov4_ops[] = {
+	{
+	.cmd = NLBL_CIPSOV4_C_ADD,
+	.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
+	.flags = GENL_ADMIN_PERM,
+	.doit = netlbl_cipsov4_add,
+	.dumpit = NULL,
+	},
+	{
+	.cmd = NLBL_CIPSOV4_C_REMOVE,
+	.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
+	.flags = GENL_ADMIN_PERM,
+	.doit = netlbl_cipsov4_remove,
+	.dumpit = NULL,
+	},
+	{
+	.cmd = NLBL_CIPSOV4_C_LIST,
+	.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
+	.flags = 0,
+	.doit = netlbl_cipsov4_list,
+	.dumpit = NULL,
+	},
+	{
+	.cmd = NLBL_CIPSOV4_C_LISTALL,
+	.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
+	.flags = 0,
+	.doit = NULL,
+	.dumpit = netlbl_cipsov4_listall,
+	},
+};
+
+static struct genl_family netlbl_cipsov4_gnl_family __ro_after_init = {
+	.hdrsize = 0,
+	.name = NETLBL_NLTYPE_CIPSOV4_NAME,
+	.version = NETLBL_PROTO_VERSION,
+	.maxattr = NLBL_CIPSOV4_A_MAX,
+	.policy = netlbl_cipsov4_genl_policy,
+	.module = THIS_MODULE,
+	.small_ops = netlbl_cipsov4_ops,
+	.n_small_ops = ARRAY_SIZE(netlbl_cipsov4_ops),
+};
+
+/*
+ * NetLabel Generic NETLINK Protocol Functions
+ */
+
+/**
+ * netlbl_cipsov4_genl_init - Register the CIPSOv4 NetLabel component
+ *
+ * Description:
+ * Register the CIPSOv4 packet NetLabel component with the Generic NETLINK
+ * mechanism.  Returns zero on success, negative values on failure.
+ *
+ */
+int __init netlbl_cipsov4_genl_init(void)
+{
+	return genl_register_family(&netlbl_cipsov4_gnl_family);
+}
diff --git a/net/netlabel/netlabel_cipso_v4.h b/net/netlabel/netlabel_cipso_v4.h
new file mode 100644
index 000000000..85d7ecb05
--- /dev/null
+++ b/net/netlabel/netlabel_cipso_v4.h
@@ -0,0 +1,155 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * NetLabel CIPSO/IPv4 Support
+ *
+ * This file defines the CIPSO/IPv4 functions 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
+ */
+
+#ifndef _NETLABEL_CIPSO_V4
+#define _NETLABEL_CIPSO_V4
+
+#include <net/netlabel.h>
+
+/*
+ * The following NetLabel payloads are supported by the CIPSO subsystem.
+ *
+ * o ADD:
+ *   Sent by an application to add a new DOI mapping table.
+ *
+ *   Required attributes:
+ *
+ *     NLBL_CIPSOV4_A_DOI
+ *     NLBL_CIPSOV4_A_MTYPE
+ *     NLBL_CIPSOV4_A_TAGLST
+ *
+ *   If using CIPSO_V4_MAP_TRANS the following attributes are required:
+ *
+ *     NLBL_CIPSOV4_A_MLSLVLLST
+ *     NLBL_CIPSOV4_A_MLSCATLST
+ *
+ *   If using CIPSO_V4_MAP_PASS or CIPSO_V4_MAP_LOCAL no additional attributes
+ *   are required.
+ *
+ * o REMOVE:
+ *   Sent by an application to remove a specific DOI mapping table from the
+ *   CIPSO V4 system.
+ *
+ *   Required attributes:
+ *
+ *     NLBL_CIPSOV4_A_DOI
+ *
+ * o LIST:
+ *   Sent by an application to list the details of a DOI definition.  On
+ *   success the kernel should send a response using the following format.
+ *
+ *   Required attributes:
+ *
+ *     NLBL_CIPSOV4_A_DOI
+ *
+ *   The valid response message format depends on the type of the DOI mapping,
+ *   the defined formats are shown below.
+ *
+ *   Required attributes:
+ *
+ *     NLBL_CIPSOV4_A_MTYPE
+ *     NLBL_CIPSOV4_A_TAGLST
+ *
+ *   If using CIPSO_V4_MAP_TRANS the following attributes are required:
+ *
+ *     NLBL_CIPSOV4_A_MLSLVLLST
+ *     NLBL_CIPSOV4_A_MLSCATLST
+ *
+ *   If using CIPSO_V4_MAP_PASS or CIPSO_V4_MAP_LOCAL no additional attributes
+ *   are required.
+ *
+ * o LISTALL:
+ *   This message is sent by an application to list the valid DOIs on the
+ *   system.  When sent by an application there is no payload and the
+ *   NLM_F_DUMP flag should be set.  The kernel should respond with a series of
+ *   the following messages.
+ *
+ *   Required attributes:
+ *
+ *    NLBL_CIPSOV4_A_DOI
+ *    NLBL_CIPSOV4_A_MTYPE
+ *
+ */
+
+/* NetLabel CIPSOv4 commands */
+enum {
+	NLBL_CIPSOV4_C_UNSPEC,
+	NLBL_CIPSOV4_C_ADD,
+	NLBL_CIPSOV4_C_REMOVE,
+	NLBL_CIPSOV4_C_LIST,
+	NLBL_CIPSOV4_C_LISTALL,
+	__NLBL_CIPSOV4_C_MAX,
+};
+
+/* NetLabel CIPSOv4 attributes */
+enum {
+	NLBL_CIPSOV4_A_UNSPEC,
+	NLBL_CIPSOV4_A_DOI,
+	/* (NLA_U32)
+	 * the DOI value */
+	NLBL_CIPSOV4_A_MTYPE,
+	/* (NLA_U32)
+	 * the mapping table type (defined in the cipso_ipv4.h header as
+	 * CIPSO_V4_MAP_*) */
+	NLBL_CIPSOV4_A_TAG,
+	/* (NLA_U8)
+	 * a CIPSO tag type, meant to be used within a NLBL_CIPSOV4_A_TAGLST
+	 * attribute */
+	NLBL_CIPSOV4_A_TAGLST,
+	/* (NLA_NESTED)
+	 * the CIPSO tag list for the DOI, there must be at least one
+	 * NLBL_CIPSOV4_A_TAG attribute, tags listed first are given higher
+	 * priorirty when sending packets */
+	NLBL_CIPSOV4_A_MLSLVLLOC,
+	/* (NLA_U32)
+	 * the local MLS sensitivity level */
+	NLBL_CIPSOV4_A_MLSLVLREM,
+	/* (NLA_U32)
+	 * the remote MLS sensitivity level */
+	NLBL_CIPSOV4_A_MLSLVL,
+	/* (NLA_NESTED)
+	 * a MLS sensitivity level mapping, must contain only one attribute of
+	 * each of the following types: NLBL_CIPSOV4_A_MLSLVLLOC and
+	 * NLBL_CIPSOV4_A_MLSLVLREM */
+	NLBL_CIPSOV4_A_MLSLVLLST,
+	/* (NLA_NESTED)
+	 * the CIPSO level mappings, there must be at least one
+	 * NLBL_CIPSOV4_A_MLSLVL attribute */
+	NLBL_CIPSOV4_A_MLSCATLOC,
+	/* (NLA_U32)
+	 * the local MLS category */
+	NLBL_CIPSOV4_A_MLSCATREM,
+	/* (NLA_U32)
+	 * the remote MLS category */
+	NLBL_CIPSOV4_A_MLSCAT,
+	/* (NLA_NESTED)
+	 * a MLS category mapping, must contain only one attribute of each of
+	 * the following types: NLBL_CIPSOV4_A_MLSCATLOC and
+	 * NLBL_CIPSOV4_A_MLSCATREM */
+	NLBL_CIPSOV4_A_MLSCATLST,
+	/* (NLA_NESTED)
+	 * the CIPSO category mappings, there must be at least one
+	 * NLBL_CIPSOV4_A_MLSCAT attribute */
+	__NLBL_CIPSOV4_A_MAX,
+};
+#define NLBL_CIPSOV4_A_MAX (__NLBL_CIPSOV4_A_MAX - 1)
+
+/* NetLabel protocol functions */
+int netlbl_cipsov4_genl_init(void);
+
+/* Free the memory associated with a CIPSOv4 DOI definition */
+void netlbl_cipsov4_doi_free(struct rcu_head *entry);
+
+#endif
diff --git a/net/netlabel/netlabel_domainhash.c b/net/netlabel/netlabel_domainhash.c
new file mode 100644
index 000000000..dc8c39f51
--- /dev/null
+++ b/net/netlabel/netlabel_domainhash.c
@@ -0,0 +1,972 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * NetLabel Domain Hash Table
+ *
+ * This file manages the domain hash table that NetLabel uses to determine
+ * which network labeling protocol to use for a given domain.  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
+ */
+
+#include <linux/types.h>
+#include <linux/rculist.h>
+#include <linux/skbuff.h>
+#include <linux/spinlock.h>
+#include <linux/string.h>
+#include <linux/audit.h>
+#include <linux/slab.h>
+#include <net/netlabel.h>
+#include <net/cipso_ipv4.h>
+#include <net/calipso.h>
+#include <asm/bug.h>
+
+#include "netlabel_mgmt.h"
+#include "netlabel_addrlist.h"
+#include "netlabel_calipso.h"
+#include "netlabel_domainhash.h"
+#include "netlabel_user.h"
+
+struct netlbl_domhsh_tbl {
+	struct list_head *tbl;
+	u32 size;
+};
+
+/* Domain hash table */
+/* updates should be so rare that having one spinlock for the entire hash table
+ * should be okay */
+static DEFINE_SPINLOCK(netlbl_domhsh_lock);
+#define netlbl_domhsh_rcu_deref(p) \
+	rcu_dereference_check(p, lockdep_is_held(&netlbl_domhsh_lock))
+static struct netlbl_domhsh_tbl __rcu *netlbl_domhsh;
+static struct netlbl_dom_map __rcu *netlbl_domhsh_def_ipv4;
+static struct netlbl_dom_map __rcu *netlbl_domhsh_def_ipv6;
+
+/*
+ * Domain Hash Table Helper Functions
+ */
+
+/**
+ * netlbl_domhsh_free_entry - Frees a domain hash table entry
+ * @entry: the entry's RCU field
+ *
+ * Description:
+ * This function is designed to be used as a callback to the call_rcu()
+ * function so that the memory allocated to a hash table entry can be released
+ * safely.
+ *
+ */
+static void netlbl_domhsh_free_entry(struct rcu_head *entry)
+{
+	struct netlbl_dom_map *ptr;
+	struct netlbl_af4list *iter4;
+	struct netlbl_af4list *tmp4;
+#if IS_ENABLED(CONFIG_IPV6)
+	struct netlbl_af6list *iter6;
+	struct netlbl_af6list *tmp6;
+#endif /* IPv6 */
+
+	ptr = container_of(entry, struct netlbl_dom_map, rcu);
+	if (ptr->def.type == NETLBL_NLTYPE_ADDRSELECT) {
+		netlbl_af4list_foreach_safe(iter4, tmp4,
+					    &ptr->def.addrsel->list4) {
+			netlbl_af4list_remove_entry(iter4);
+			kfree(netlbl_domhsh_addr4_entry(iter4));
+		}
+#if IS_ENABLED(CONFIG_IPV6)
+		netlbl_af6list_foreach_safe(iter6, tmp6,
+					    &ptr->def.addrsel->list6) {
+			netlbl_af6list_remove_entry(iter6);
+			kfree(netlbl_domhsh_addr6_entry(iter6));
+		}
+#endif /* IPv6 */
+		kfree(ptr->def.addrsel);
+	}
+	kfree(ptr->domain);
+	kfree(ptr);
+}
+
+/**
+ * netlbl_domhsh_hash - Hashing function for the domain hash table
+ * @key: the domain name to hash
+ *
+ * Description:
+ * This is the hashing function for the domain hash table, it returns the
+ * correct bucket number for the domain.  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_domhsh_hash(const char *key)
+{
+	u32 iter;
+	u32 val;
+	u32 len;
+
+	/* This is taken (with slight modification) from
+	 * security/selinux/ss/symtab.c:symhash() */
+
+	for (iter = 0, val = 0, len = strlen(key); iter < len; iter++)
+		val = (val << 4 | (val >> (8 * sizeof(u32) - 4))) ^ key[iter];
+	return val & (netlbl_domhsh_rcu_deref(netlbl_domhsh)->size - 1);
+}
+
+static bool netlbl_family_match(u16 f1, u16 f2)
+{
+	return (f1 == f2) || (f1 == AF_UNSPEC) || (f2 == AF_UNSPEC);
+}
+
+/**
+ * netlbl_domhsh_search - Search for a domain entry
+ * @domain: the domain
+ * @family: the address family
+ *
+ * Description:
+ * Searches the domain hash table and returns a pointer to the hash table
+ * entry if found, otherwise NULL is returned.  @family may be %AF_UNSPEC
+ * which matches any address family entries.  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_dom_map *netlbl_domhsh_search(const char *domain,
+						   u16 family)
+{
+	u32 bkt;
+	struct list_head *bkt_list;
+	struct netlbl_dom_map *iter;
+
+	if (domain != NULL) {
+		bkt = netlbl_domhsh_hash(domain);
+		bkt_list = &netlbl_domhsh_rcu_deref(netlbl_domhsh)->tbl[bkt];
+		list_for_each_entry_rcu(iter, bkt_list, list,
+					lockdep_is_held(&netlbl_domhsh_lock))
+			if (iter->valid &&
+			    netlbl_family_match(iter->family, family) &&
+			    strcmp(iter->domain, domain) == 0)
+				return iter;
+	}
+
+	return NULL;
+}
+
+/**
+ * netlbl_domhsh_search_def - Search for a domain entry
+ * @domain: the domain
+ * @family: the address family
+ *
+ * Description:
+ * Searches the domain hash table and returns a pointer to the hash table
+ * entry if an exact match is found, if an exact match is not present in the
+ * hash table then the default entry is returned if valid otherwise NULL is
+ * returned.  @family may be %AF_UNSPEC which matches any address family
+ * entries.  The caller is responsible ensuring that the hash table is
+ * protected with either a RCU read lock or the hash table lock.
+ *
+ */
+static struct netlbl_dom_map *netlbl_domhsh_search_def(const char *domain,
+						       u16 family)
+{
+	struct netlbl_dom_map *entry;
+
+	entry = netlbl_domhsh_search(domain, family);
+	if (entry != NULL)
+		return entry;
+	if (family == AF_INET || family == AF_UNSPEC) {
+		entry = netlbl_domhsh_rcu_deref(netlbl_domhsh_def_ipv4);
+		if (entry != NULL && entry->valid)
+			return entry;
+	}
+	if (family == AF_INET6 || family == AF_UNSPEC) {
+		entry = netlbl_domhsh_rcu_deref(netlbl_domhsh_def_ipv6);
+		if (entry != NULL && entry->valid)
+			return entry;
+	}
+
+	return NULL;
+}
+
+/**
+ * netlbl_domhsh_audit_add - Generate an audit entry for an add event
+ * @entry: the entry being added
+ * @addr4: the IPv4 address information
+ * @addr6: the IPv6 address information
+ * @result: the result code
+ * @audit_info: NetLabel audit information
+ *
+ * Description:
+ * Generate an audit record for adding a new NetLabel/LSM mapping entry with
+ * the given information.  Caller is responsible for holding the necessary
+ * locks.
+ *
+ */
+static void netlbl_domhsh_audit_add(struct netlbl_dom_map *entry,
+				    struct netlbl_af4list *addr4,
+				    struct netlbl_af6list *addr6,
+				    int result,
+				    struct netlbl_audit *audit_info)
+{
+	struct audit_buffer *audit_buf;
+	struct cipso_v4_doi *cipsov4 = NULL;
+	struct calipso_doi *calipso = NULL;
+	u32 type;
+
+	audit_buf = netlbl_audit_start_common(AUDIT_MAC_MAP_ADD, audit_info);
+	if (audit_buf != NULL) {
+		audit_log_format(audit_buf, " nlbl_domain=%s",
+				 entry->domain ? entry->domain : "(default)");
+		if (addr4 != NULL) {
+			struct netlbl_domaddr4_map *map4;
+			map4 = netlbl_domhsh_addr4_entry(addr4);
+			type = map4->def.type;
+			cipsov4 = map4->def.cipso;
+			netlbl_af4list_audit_addr(audit_buf, 0, NULL,
+						  addr4->addr, addr4->mask);
+#if IS_ENABLED(CONFIG_IPV6)
+		} else if (addr6 != NULL) {
+			struct netlbl_domaddr6_map *map6;
+			map6 = netlbl_domhsh_addr6_entry(addr6);
+			type = map6->def.type;
+			calipso = map6->def.calipso;
+			netlbl_af6list_audit_addr(audit_buf, 0, NULL,
+						  &addr6->addr, &addr6->mask);
+#endif /* IPv6 */
+		} else {
+			type = entry->def.type;
+			cipsov4 = entry->def.cipso;
+			calipso = entry->def.calipso;
+		}
+		switch (type) {
+		case NETLBL_NLTYPE_UNLABELED:
+			audit_log_format(audit_buf, " nlbl_protocol=unlbl");
+			break;
+		case NETLBL_NLTYPE_CIPSOV4:
+			BUG_ON(cipsov4 == NULL);
+			audit_log_format(audit_buf,
+					 " nlbl_protocol=cipsov4 cipso_doi=%u",
+					 cipsov4->doi);
+			break;
+		case NETLBL_NLTYPE_CALIPSO:
+			BUG_ON(calipso == NULL);
+			audit_log_format(audit_buf,
+					 " nlbl_protocol=calipso calipso_doi=%u",
+					 calipso->doi);
+			break;
+		}
+		audit_log_format(audit_buf, " res=%u", result == 0 ? 1 : 0);
+		audit_log_end(audit_buf);
+	}
+}
+
+/**
+ * netlbl_domhsh_validate - Validate a new domain mapping entry
+ * @entry: the entry to validate
+ *
+ * This function validates the new domain mapping entry to ensure that it is
+ * a valid entry.  Returns zero on success, negative values on failure.
+ *
+ */
+static int netlbl_domhsh_validate(const struct netlbl_dom_map *entry)
+{
+	struct netlbl_af4list *iter4;
+	struct netlbl_domaddr4_map *map4;
+#if IS_ENABLED(CONFIG_IPV6)
+	struct netlbl_af6list *iter6;
+	struct netlbl_domaddr6_map *map6;
+#endif /* IPv6 */
+
+	if (entry == NULL)
+		return -EINVAL;
+
+	if (entry->family != AF_INET && entry->family != AF_INET6 &&
+	    (entry->family != AF_UNSPEC ||
+	     entry->def.type != NETLBL_NLTYPE_UNLABELED))
+		return -EINVAL;
+
+	switch (entry->def.type) {
+	case NETLBL_NLTYPE_UNLABELED:
+		if (entry->def.cipso != NULL || entry->def.calipso != NULL ||
+		    entry->def.addrsel != NULL)
+			return -EINVAL;
+		break;
+	case NETLBL_NLTYPE_CIPSOV4:
+		if (entry->family != AF_INET ||
+		    entry->def.cipso == NULL)
+			return -EINVAL;
+		break;
+	case NETLBL_NLTYPE_CALIPSO:
+		if (entry->family != AF_INET6 ||
+		    entry->def.calipso == NULL)
+			return -EINVAL;
+		break;
+	case NETLBL_NLTYPE_ADDRSELECT:
+		netlbl_af4list_foreach(iter4, &entry->def.addrsel->list4) {
+			map4 = netlbl_domhsh_addr4_entry(iter4);
+			switch (map4->def.type) {
+			case NETLBL_NLTYPE_UNLABELED:
+				if (map4->def.cipso != NULL)
+					return -EINVAL;
+				break;
+			case NETLBL_NLTYPE_CIPSOV4:
+				if (map4->def.cipso == NULL)
+					return -EINVAL;
+				break;
+			default:
+				return -EINVAL;
+			}
+		}
+#if IS_ENABLED(CONFIG_IPV6)
+		netlbl_af6list_foreach(iter6, &entry->def.addrsel->list6) {
+			map6 = netlbl_domhsh_addr6_entry(iter6);
+			switch (map6->def.type) {
+			case NETLBL_NLTYPE_UNLABELED:
+				if (map6->def.calipso != NULL)
+					return -EINVAL;
+				break;
+			case NETLBL_NLTYPE_CALIPSO:
+				if (map6->def.calipso == NULL)
+					return -EINVAL;
+				break;
+			default:
+				return -EINVAL;
+			}
+		}
+#endif /* IPv6 */
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+/*
+ * Domain Hash Table Functions
+ */
+
+/**
+ * netlbl_domhsh_init - Init for the domain hash
+ * @size: the number of bits to use for the hash buckets
+ *
+ * Description:
+ * Initializes the domain hash table, should be called only by
+ * netlbl_user_init() during initialization.  Returns zero on success, non-zero
+ * values on error.
+ *
+ */
+int __init netlbl_domhsh_init(u32 size)
+{
+	u32 iter;
+	struct netlbl_domhsh_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_domhsh_lock);
+	rcu_assign_pointer(netlbl_domhsh, hsh_tbl);
+	spin_unlock(&netlbl_domhsh_lock);
+
+	return 0;
+}
+
+/**
+ * netlbl_domhsh_add - Adds a entry to the domain hash table
+ * @entry: the entry to add
+ * @audit_info: NetLabel audit information
+ *
+ * Description:
+ * Adds a new entry to the domain hash table and handles any updates to the
+ * lower level protocol handler (i.e. CIPSO).  @entry->family may be set to
+ * %AF_UNSPEC which will add an entry that matches all address families.  This
+ * is only useful for the unlabelled type and will only succeed if there is no
+ * existing entry for any address family with the same domain.  Returns zero
+ * on success, negative on failure.
+ *
+ */
+int netlbl_domhsh_add(struct netlbl_dom_map *entry,
+		      struct netlbl_audit *audit_info)
+{
+	int ret_val = 0;
+	struct netlbl_dom_map *entry_old, *entry_b;
+	struct netlbl_af4list *iter4;
+	struct netlbl_af4list *tmp4;
+#if IS_ENABLED(CONFIG_IPV6)
+	struct netlbl_af6list *iter6;
+	struct netlbl_af6list *tmp6;
+#endif /* IPv6 */
+
+	ret_val = netlbl_domhsh_validate(entry);
+	if (ret_val != 0)
+		return ret_val;
+
+	/* XXX - we can remove this RCU read lock as the spinlock protects the
+	 *       entire function, but before we do we need to fixup the
+	 *       netlbl_af[4,6]list RCU functions to do "the right thing" with
+	 *       respect to rcu_dereference() when only a spinlock is held. */
+	rcu_read_lock();
+	spin_lock(&netlbl_domhsh_lock);
+	if (entry->domain != NULL)
+		entry_old = netlbl_domhsh_search(entry->domain, entry->family);
+	else
+		entry_old = netlbl_domhsh_search_def(entry->domain,
+						     entry->family);
+	if (entry_old == NULL) {
+		entry->valid = 1;
+
+		if (entry->domain != NULL) {
+			u32 bkt = netlbl_domhsh_hash(entry->domain);
+			list_add_tail_rcu(&entry->list,
+				    &rcu_dereference(netlbl_domhsh)->tbl[bkt]);
+		} else {
+			INIT_LIST_HEAD(&entry->list);
+			switch (entry->family) {
+			case AF_INET:
+				rcu_assign_pointer(netlbl_domhsh_def_ipv4,
+						   entry);
+				break;
+			case AF_INET6:
+				rcu_assign_pointer(netlbl_domhsh_def_ipv6,
+						   entry);
+				break;
+			case AF_UNSPEC:
+				if (entry->def.type !=
+				    NETLBL_NLTYPE_UNLABELED) {
+					ret_val = -EINVAL;
+					goto add_return;
+				}
+				entry_b = kzalloc(sizeof(*entry_b), GFP_ATOMIC);
+				if (entry_b == NULL) {
+					ret_val = -ENOMEM;
+					goto add_return;
+				}
+				entry_b->family = AF_INET6;
+				entry_b->def.type = NETLBL_NLTYPE_UNLABELED;
+				entry_b->valid = 1;
+				entry->family = AF_INET;
+				rcu_assign_pointer(netlbl_domhsh_def_ipv4,
+						   entry);
+				rcu_assign_pointer(netlbl_domhsh_def_ipv6,
+						   entry_b);
+				break;
+			default:
+				/* Already checked in
+				 * netlbl_domhsh_validate(). */
+				ret_val = -EINVAL;
+				goto add_return;
+			}
+		}
+
+		if (entry->def.type == NETLBL_NLTYPE_ADDRSELECT) {
+			netlbl_af4list_foreach_rcu(iter4,
+						   &entry->def.addrsel->list4)
+				netlbl_domhsh_audit_add(entry, iter4, NULL,
+							ret_val, audit_info);
+#if IS_ENABLED(CONFIG_IPV6)
+			netlbl_af6list_foreach_rcu(iter6,
+						   &entry->def.addrsel->list6)
+				netlbl_domhsh_audit_add(entry, NULL, iter6,
+							ret_val, audit_info);
+#endif /* IPv6 */
+		} else
+			netlbl_domhsh_audit_add(entry, NULL, NULL,
+						ret_val, audit_info);
+	} else if (entry_old->def.type == NETLBL_NLTYPE_ADDRSELECT &&
+		   entry->def.type == NETLBL_NLTYPE_ADDRSELECT) {
+		struct list_head *old_list4;
+		struct list_head *old_list6;
+
+		old_list4 = &entry_old->def.addrsel->list4;
+		old_list6 = &entry_old->def.addrsel->list6;
+
+		/* we only allow the addition of address selectors if all of
+		 * the selectors do not exist in the existing domain map */
+		netlbl_af4list_foreach_rcu(iter4, &entry->def.addrsel->list4)
+			if (netlbl_af4list_search_exact(iter4->addr,
+							iter4->mask,
+							old_list4)) {
+				ret_val = -EEXIST;
+				goto add_return;
+			}
+#if IS_ENABLED(CONFIG_IPV6)
+		netlbl_af6list_foreach_rcu(iter6, &entry->def.addrsel->list6)
+			if (netlbl_af6list_search_exact(&iter6->addr,
+							&iter6->mask,
+							old_list6)) {
+				ret_val = -EEXIST;
+				goto add_return;
+			}
+#endif /* IPv6 */
+
+		netlbl_af4list_foreach_safe(iter4, tmp4,
+					    &entry->def.addrsel->list4) {
+			netlbl_af4list_remove_entry(iter4);
+			iter4->valid = 1;
+			ret_val = netlbl_af4list_add(iter4, old_list4);
+			netlbl_domhsh_audit_add(entry_old, iter4, NULL,
+						ret_val, audit_info);
+			if (ret_val != 0)
+				goto add_return;
+		}
+#if IS_ENABLED(CONFIG_IPV6)
+		netlbl_af6list_foreach_safe(iter6, tmp6,
+					    &entry->def.addrsel->list6) {
+			netlbl_af6list_remove_entry(iter6);
+			iter6->valid = 1;
+			ret_val = netlbl_af6list_add(iter6, old_list6);
+			netlbl_domhsh_audit_add(entry_old, NULL, iter6,
+						ret_val, audit_info);
+			if (ret_val != 0)
+				goto add_return;
+		}
+#endif /* IPv6 */
+		/* cleanup the new entry since we've moved everything over */
+		netlbl_domhsh_free_entry(&entry->rcu);
+	} else
+		ret_val = -EINVAL;
+
+add_return:
+	spin_unlock(&netlbl_domhsh_lock);
+	rcu_read_unlock();
+	return ret_val;
+}
+
+/**
+ * netlbl_domhsh_add_default - Adds the default entry to the domain hash table
+ * @entry: the entry to add
+ * @audit_info: NetLabel audit information
+ *
+ * Description:
+ * Adds a new default entry to the domain hash table and handles any updates
+ * to the lower level protocol handler (i.e. CIPSO).  Returns zero on success,
+ * negative on failure.
+ *
+ */
+int netlbl_domhsh_add_default(struct netlbl_dom_map *entry,
+			      struct netlbl_audit *audit_info)
+{
+	return netlbl_domhsh_add(entry, audit_info);
+}
+
+/**
+ * netlbl_domhsh_remove_entry - Removes a given entry from the domain table
+ * @entry: the entry to remove
+ * @audit_info: NetLabel audit information
+ *
+ * Description:
+ * Removes an entry from the domain hash table and handles any updates to the
+ * lower level protocol handler (i.e. CIPSO).  Caller is responsible for
+ * ensuring that the RCU read lock is held.  Returns zero on success, negative
+ * on failure.
+ *
+ */
+int netlbl_domhsh_remove_entry(struct netlbl_dom_map *entry,
+			       struct netlbl_audit *audit_info)
+{
+	int ret_val = 0;
+	struct audit_buffer *audit_buf;
+	struct netlbl_af4list *iter4;
+	struct netlbl_domaddr4_map *map4;
+#if IS_ENABLED(CONFIG_IPV6)
+	struct netlbl_af6list *iter6;
+	struct netlbl_domaddr6_map *map6;
+#endif /* IPv6 */
+
+	if (entry == NULL)
+		return -ENOENT;
+
+	spin_lock(&netlbl_domhsh_lock);
+	if (entry->valid) {
+		entry->valid = 0;
+		if (entry == rcu_dereference(netlbl_domhsh_def_ipv4))
+			RCU_INIT_POINTER(netlbl_domhsh_def_ipv4, NULL);
+		else if (entry == rcu_dereference(netlbl_domhsh_def_ipv6))
+			RCU_INIT_POINTER(netlbl_domhsh_def_ipv6, NULL);
+		else
+			list_del_rcu(&entry->list);
+	} else
+		ret_val = -ENOENT;
+	spin_unlock(&netlbl_domhsh_lock);
+
+	if (ret_val)
+		return ret_val;
+
+	audit_buf = netlbl_audit_start_common(AUDIT_MAC_MAP_DEL, audit_info);
+	if (audit_buf != NULL) {
+		audit_log_format(audit_buf,
+				 " nlbl_domain=%s res=1",
+				 entry->domain ? entry->domain : "(default)");
+		audit_log_end(audit_buf);
+	}
+
+	switch (entry->def.type) {
+	case NETLBL_NLTYPE_ADDRSELECT:
+		netlbl_af4list_foreach_rcu(iter4, &entry->def.addrsel->list4) {
+			map4 = netlbl_domhsh_addr4_entry(iter4);
+			cipso_v4_doi_putdef(map4->def.cipso);
+		}
+#if IS_ENABLED(CONFIG_IPV6)
+		netlbl_af6list_foreach_rcu(iter6, &entry->def.addrsel->list6) {
+			map6 = netlbl_domhsh_addr6_entry(iter6);
+			calipso_doi_putdef(map6->def.calipso);
+		}
+#endif /* IPv6 */
+		break;
+	case NETLBL_NLTYPE_CIPSOV4:
+		cipso_v4_doi_putdef(entry->def.cipso);
+		break;
+#if IS_ENABLED(CONFIG_IPV6)
+	case NETLBL_NLTYPE_CALIPSO:
+		calipso_doi_putdef(entry->def.calipso);
+		break;
+#endif /* IPv6 */
+	}
+	call_rcu(&entry->rcu, netlbl_domhsh_free_entry);
+
+	return ret_val;
+}
+
+/**
+ * netlbl_domhsh_remove_af4 - Removes an address selector entry
+ * @domain: the domain
+ * @addr: IPv4 address
+ * @mask: IPv4 address mask
+ * @audit_info: NetLabel audit information
+ *
+ * Description:
+ * Removes an individual address selector from a domain mapping and potentially
+ * the entire mapping if it is empty.  Returns zero on success, negative values
+ * on failure.
+ *
+ */
+int netlbl_domhsh_remove_af4(const char *domain,
+			     const struct in_addr *addr,
+			     const struct in_addr *mask,
+			     struct netlbl_audit *audit_info)
+{
+	struct netlbl_dom_map *entry_map;
+	struct netlbl_af4list *entry_addr;
+	struct netlbl_af4list *iter4;
+#if IS_ENABLED(CONFIG_IPV6)
+	struct netlbl_af6list *iter6;
+#endif /* IPv6 */
+	struct netlbl_domaddr4_map *entry;
+
+	rcu_read_lock();
+
+	if (domain)
+		entry_map = netlbl_domhsh_search(domain, AF_INET);
+	else
+		entry_map = netlbl_domhsh_search_def(domain, AF_INET);
+	if (entry_map == NULL ||
+	    entry_map->def.type != NETLBL_NLTYPE_ADDRSELECT)
+		goto remove_af4_failure;
+
+	spin_lock(&netlbl_domhsh_lock);
+	entry_addr = netlbl_af4list_remove(addr->s_addr, mask->s_addr,
+					   &entry_map->def.addrsel->list4);
+	spin_unlock(&netlbl_domhsh_lock);
+
+	if (entry_addr == NULL)
+		goto remove_af4_failure;
+	netlbl_af4list_foreach_rcu(iter4, &entry_map->def.addrsel->list4)
+		goto remove_af4_single_addr;
+#if IS_ENABLED(CONFIG_IPV6)
+	netlbl_af6list_foreach_rcu(iter6, &entry_map->def.addrsel->list6)
+		goto remove_af4_single_addr;
+#endif /* IPv6 */
+	/* the domain mapping is empty so remove it from the mapping table */
+	netlbl_domhsh_remove_entry(entry_map, audit_info);
+
+remove_af4_single_addr:
+	rcu_read_unlock();
+	/* yick, we can't use call_rcu here because we don't have a rcu head
+	 * pointer but hopefully this should be a rare case so the pause
+	 * shouldn't be a problem */
+	synchronize_rcu();
+	entry = netlbl_domhsh_addr4_entry(entry_addr);
+	cipso_v4_doi_putdef(entry->def.cipso);
+	kfree(entry);
+	return 0;
+
+remove_af4_failure:
+	rcu_read_unlock();
+	return -ENOENT;
+}
+
+#if IS_ENABLED(CONFIG_IPV6)
+/**
+ * netlbl_domhsh_remove_af6 - Removes an address selector entry
+ * @domain: the domain
+ * @addr: IPv6 address
+ * @mask: IPv6 address mask
+ * @audit_info: NetLabel audit information
+ *
+ * Description:
+ * Removes an individual address selector from a domain mapping and potentially
+ * the entire mapping if it is empty.  Returns zero on success, negative values
+ * on failure.
+ *
+ */
+int netlbl_domhsh_remove_af6(const char *domain,
+			     const struct in6_addr *addr,
+			     const struct in6_addr *mask,
+			     struct netlbl_audit *audit_info)
+{
+	struct netlbl_dom_map *entry_map;
+	struct netlbl_af6list *entry_addr;
+	struct netlbl_af4list *iter4;
+	struct netlbl_af6list *iter6;
+	struct netlbl_domaddr6_map *entry;
+
+	rcu_read_lock();
+
+	if (domain)
+		entry_map = netlbl_domhsh_search(domain, AF_INET6);
+	else
+		entry_map = netlbl_domhsh_search_def(domain, AF_INET6);
+	if (entry_map == NULL ||
+	    entry_map->def.type != NETLBL_NLTYPE_ADDRSELECT)
+		goto remove_af6_failure;
+
+	spin_lock(&netlbl_domhsh_lock);
+	entry_addr = netlbl_af6list_remove(addr, mask,
+					   &entry_map->def.addrsel->list6);
+	spin_unlock(&netlbl_domhsh_lock);
+
+	if (entry_addr == NULL)
+		goto remove_af6_failure;
+	netlbl_af4list_foreach_rcu(iter4, &entry_map->def.addrsel->list4)
+		goto remove_af6_single_addr;
+	netlbl_af6list_foreach_rcu(iter6, &entry_map->def.addrsel->list6)
+		goto remove_af6_single_addr;
+	/* the domain mapping is empty so remove it from the mapping table */
+	netlbl_domhsh_remove_entry(entry_map, audit_info);
+
+remove_af6_single_addr:
+	rcu_read_unlock();
+	/* yick, we can't use call_rcu here because we don't have a rcu head
+	 * pointer but hopefully this should be a rare case so the pause
+	 * shouldn't be a problem */
+	synchronize_rcu();
+	entry = netlbl_domhsh_addr6_entry(entry_addr);
+	calipso_doi_putdef(entry->def.calipso);
+	kfree(entry);
+	return 0;
+
+remove_af6_failure:
+	rcu_read_unlock();
+	return -ENOENT;
+}
+#endif /* IPv6 */
+
+/**
+ * netlbl_domhsh_remove - Removes an entry from the domain hash table
+ * @domain: the domain to remove
+ * @family: address family
+ * @audit_info: NetLabel audit information
+ *
+ * Description:
+ * Removes an entry from the domain hash table and handles any updates to the
+ * lower level protocol handler (i.e. CIPSO).  @family may be %AF_UNSPEC which
+ * removes all address family entries.  Returns zero on success, negative on
+ * failure.
+ *
+ */
+int netlbl_domhsh_remove(const char *domain, u16 family,
+			 struct netlbl_audit *audit_info)
+{
+	int ret_val = -EINVAL;
+	struct netlbl_dom_map *entry;
+
+	rcu_read_lock();
+
+	if (family == AF_INET || family == AF_UNSPEC) {
+		if (domain)
+			entry = netlbl_domhsh_search(domain, AF_INET);
+		else
+			entry = netlbl_domhsh_search_def(domain, AF_INET);
+		ret_val = netlbl_domhsh_remove_entry(entry, audit_info);
+		if (ret_val && ret_val != -ENOENT)
+			goto done;
+	}
+	if (family == AF_INET6 || family == AF_UNSPEC) {
+		int ret_val2;
+
+		if (domain)
+			entry = netlbl_domhsh_search(domain, AF_INET6);
+		else
+			entry = netlbl_domhsh_search_def(domain, AF_INET6);
+		ret_val2 = netlbl_domhsh_remove_entry(entry, audit_info);
+		if (ret_val2 != -ENOENT)
+			ret_val = ret_val2;
+	}
+done:
+	rcu_read_unlock();
+
+	return ret_val;
+}
+
+/**
+ * netlbl_domhsh_remove_default - Removes the default entry from the table
+ * @family: address family
+ * @audit_info: NetLabel audit information
+ *
+ * Description:
+ * Removes/resets the default entry corresponding to @family from the domain
+ * hash table and handles any updates to the lower level protocol handler
+ * (i.e. CIPSO).  @family may be %AF_UNSPEC which removes all address family
+ * entries.  Returns zero on success, negative on failure.
+ *
+ */
+int netlbl_domhsh_remove_default(u16 family, struct netlbl_audit *audit_info)
+{
+	return netlbl_domhsh_remove(NULL, family, audit_info);
+}
+
+/**
+ * netlbl_domhsh_getentry - Get an entry from the domain hash table
+ * @domain: the domain name to search for
+ * @family: address family
+ *
+ * Description:
+ * Look through the domain hash table searching for an entry to match @domain,
+ * with address family @family, return a pointer to a copy of the entry or
+ * NULL.  The caller is responsible for ensuring that rcu_read_[un]lock() is
+ * called.
+ *
+ */
+struct netlbl_dom_map *netlbl_domhsh_getentry(const char *domain, u16 family)
+{
+	if (family == AF_UNSPEC)
+		return NULL;
+	return netlbl_domhsh_search_def(domain, family);
+}
+
+/**
+ * netlbl_domhsh_getentry_af4 - Get an entry from the domain hash table
+ * @domain: the domain name to search for
+ * @addr: the IP address to search for
+ *
+ * Description:
+ * Look through the domain hash table searching for an entry to match @domain
+ * and @addr, return a pointer to a copy of the entry or NULL.  The caller is
+ * responsible for ensuring that rcu_read_[un]lock() is called.
+ *
+ */
+struct netlbl_dommap_def *netlbl_domhsh_getentry_af4(const char *domain,
+						     __be32 addr)
+{
+	struct netlbl_dom_map *dom_iter;
+	struct netlbl_af4list *addr_iter;
+
+	dom_iter = netlbl_domhsh_search_def(domain, AF_INET);
+	if (dom_iter == NULL)
+		return NULL;
+
+	if (dom_iter->def.type != NETLBL_NLTYPE_ADDRSELECT)
+		return &dom_iter->def;
+	addr_iter = netlbl_af4list_search(addr, &dom_iter->def.addrsel->list4);
+	if (addr_iter == NULL)
+		return NULL;
+	return &(netlbl_domhsh_addr4_entry(addr_iter)->def);
+}
+
+#if IS_ENABLED(CONFIG_IPV6)
+/**
+ * netlbl_domhsh_getentry_af6 - Get an entry from the domain hash table
+ * @domain: the domain name to search for
+ * @addr: the IP address to search for
+ *
+ * Description:
+ * Look through the domain hash table searching for an entry to match @domain
+ * and @addr, return a pointer to a copy of the entry or NULL.  The caller is
+ * responsible for ensuring that rcu_read_[un]lock() is called.
+ *
+ */
+struct netlbl_dommap_def *netlbl_domhsh_getentry_af6(const char *domain,
+						   const struct in6_addr *addr)
+{
+	struct netlbl_dom_map *dom_iter;
+	struct netlbl_af6list *addr_iter;
+
+	dom_iter = netlbl_domhsh_search_def(domain, AF_INET6);
+	if (dom_iter == NULL)
+		return NULL;
+
+	if (dom_iter->def.type != NETLBL_NLTYPE_ADDRSELECT)
+		return &dom_iter->def;
+	addr_iter = netlbl_af6list_search(addr, &dom_iter->def.addrsel->list6);
+	if (addr_iter == NULL)
+		return NULL;
+	return &(netlbl_domhsh_addr6_entry(addr_iter)->def);
+}
+#endif /* IPv6 */
+
+/**
+ * netlbl_domhsh_walk - Iterate through the domain mapping hash table
+ * @skip_bkt: the number of buckets to skip at the start
+ * @skip_chain: the number of entries to skip in the first iterated bucket
+ * @callback: callback for each entry
+ * @cb_arg: argument for the callback function
+ *
+ * Description:
+ * Interate over the domain mapping hash table, skipping the first @skip_bkt
+ * buckets and @skip_chain entries.  For each entry in the table call
+ * @callback, if @callback returns a negative value stop 'walking' through the
+ * table and return.  Updates the values in @skip_bkt and @skip_chain on
+ * return.  Returns zero on success, negative values on failure.
+ *
+ */
+int netlbl_domhsh_walk(u32 *skip_bkt,
+		     u32 *skip_chain,
+		     int (*callback) (struct netlbl_dom_map *entry, void *arg),
+		     void *cb_arg)
+{
+	int ret_val = -ENOENT;
+	u32 iter_bkt;
+	struct list_head *iter_list;
+	struct netlbl_dom_map *iter_entry;
+	u32 chain_cnt = 0;
+
+	rcu_read_lock();
+	for (iter_bkt = *skip_bkt;
+	     iter_bkt < rcu_dereference(netlbl_domhsh)->size;
+	     iter_bkt++, chain_cnt = 0) {
+		iter_list = &rcu_dereference(netlbl_domhsh)->tbl[iter_bkt];
+		list_for_each_entry_rcu(iter_entry, iter_list, list)
+			if (iter_entry->valid) {
+				if (chain_cnt++ < *skip_chain)
+					continue;
+				ret_val = callback(iter_entry, cb_arg);
+				if (ret_val < 0) {
+					chain_cnt--;
+					goto walk_return;
+				}
+			}
+	}
+
+walk_return:
+	rcu_read_unlock();
+	*skip_bkt = iter_bkt;
+	*skip_chain = chain_cnt;
+	return ret_val;
+}
diff --git a/net/netlabel/netlabel_domainhash.h b/net/netlabel/netlabel_domainhash.h
new file mode 100644
index 000000000..9f80972ae
--- /dev/null
+++ b/net/netlabel/netlabel_domainhash.h
@@ -0,0 +1,106 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * NetLabel Domain Hash Table
+ *
+ * This file manages the domain hash table that NetLabel uses to determine
+ * which network labeling protocol to use for a given domain.  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
+ */
+
+#ifndef _NETLABEL_DOMAINHASH_H
+#define _NETLABEL_DOMAINHASH_H
+
+#include <linux/types.h>
+#include <linux/rcupdate.h>
+#include <linux/list.h>
+
+#include "netlabel_addrlist.h"
+
+/* Domain hash table size */
+/* XXX - currently this number is an uneducated guess */
+#define NETLBL_DOMHSH_BITSIZE       7
+
+/* Domain mapping definition structures */
+struct netlbl_domaddr_map {
+	struct list_head list4;
+	struct list_head list6;
+};
+struct netlbl_dommap_def {
+	u32 type;
+	union {
+		struct netlbl_domaddr_map *addrsel;
+		struct cipso_v4_doi *cipso;
+		struct calipso_doi *calipso;
+	};
+};
+#define netlbl_domhsh_addr4_entry(iter) \
+	container_of(iter, struct netlbl_domaddr4_map, list)
+struct netlbl_domaddr4_map {
+	struct netlbl_dommap_def def;
+
+	struct netlbl_af4list list;
+};
+#define netlbl_domhsh_addr6_entry(iter) \
+	container_of(iter, struct netlbl_domaddr6_map, list)
+struct netlbl_domaddr6_map {
+	struct netlbl_dommap_def def;
+
+	struct netlbl_af6list list;
+};
+
+struct netlbl_dom_map {
+	char *domain;
+	u16 family;
+	struct netlbl_dommap_def def;
+
+	u32 valid;
+	struct list_head list;
+	struct rcu_head rcu;
+};
+
+/* init function */
+int netlbl_domhsh_init(u32 size);
+
+/* Manipulate the domain hash table */
+int netlbl_domhsh_add(struct netlbl_dom_map *entry,
+		      struct netlbl_audit *audit_info);
+int netlbl_domhsh_add_default(struct netlbl_dom_map *entry,
+			      struct netlbl_audit *audit_info);
+int netlbl_domhsh_remove_entry(struct netlbl_dom_map *entry,
+			       struct netlbl_audit *audit_info);
+int netlbl_domhsh_remove_af4(const char *domain,
+			     const struct in_addr *addr,
+			     const struct in_addr *mask,
+			     struct netlbl_audit *audit_info);
+int netlbl_domhsh_remove_af6(const char *domain,
+			     const struct in6_addr *addr,
+			     const struct in6_addr *mask,
+			     struct netlbl_audit *audit_info);
+int netlbl_domhsh_remove(const char *domain, u16 family,
+			 struct netlbl_audit *audit_info);
+int netlbl_domhsh_remove_default(u16 family, struct netlbl_audit *audit_info);
+struct netlbl_dom_map *netlbl_domhsh_getentry(const char *domain, u16 family);
+struct netlbl_dommap_def *netlbl_domhsh_getentry_af4(const char *domain,
+						     __be32 addr);
+#if IS_ENABLED(CONFIG_IPV6)
+struct netlbl_dommap_def *netlbl_domhsh_getentry_af6(const char *domain,
+						   const struct in6_addr *addr);
+int netlbl_domhsh_remove_af6(const char *domain,
+			     const struct in6_addr *addr,
+			     const struct in6_addr *mask,
+			     struct netlbl_audit *audit_info);
+#endif /* IPv6 */
+
+int netlbl_domhsh_walk(u32 *skip_bkt,
+		     u32 *skip_chain,
+		     int (*callback) (struct netlbl_dom_map *entry, void *arg),
+		     void *cb_arg);
+
+#endif
diff --git a/net/netlabel/netlabel_kapi.c b/net/netlabel/netlabel_kapi.c
new file mode 100644
index 000000000..96059c99b
--- /dev/null
+++ b/net/netlabel/netlabel_kapi.c
@@ -0,0 +1,1526 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * NetLabel Kernel API
+ *
+ * This file defines the kernel API 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
+ */
+
+#include <linux/init.h>
+#include <linux/types.h>
+#include <linux/slab.h>
+#include <linux/audit.h>
+#include <linux/in.h>
+#include <linux/in6.h>
+#include <net/ip.h>
+#include <net/ipv6.h>
+#include <net/netlabel.h>
+#include <net/cipso_ipv4.h>
+#include <net/calipso.h>
+#include <asm/bug.h>
+#include <linux/atomic.h>
+
+#include "netlabel_domainhash.h"
+#include "netlabel_unlabeled.h"
+#include "netlabel_cipso_v4.h"
+#include "netlabel_calipso.h"
+#include "netlabel_user.h"
+#include "netlabel_mgmt.h"
+#include "netlabel_addrlist.h"
+
+/*
+ * Configuration Functions
+ */
+
+/**
+ * netlbl_cfg_map_del - Remove a NetLabel/LSM domain mapping
+ * @domain: the domain mapping to remove
+ * @family: address family
+ * @addr: IP address
+ * @mask: IP address mask
+ * @audit_info: NetLabel audit information
+ *
+ * Description:
+ * Removes a NetLabel/LSM domain mapping.  A @domain value of NULL causes the
+ * default domain mapping to be removed.  Returns zero on success, negative
+ * values on failure.
+ *
+ */
+int netlbl_cfg_map_del(const char *domain,
+		       u16 family,
+		       const void *addr,
+		       const void *mask,
+		       struct netlbl_audit *audit_info)
+{
+	if (addr == NULL && mask == NULL) {
+		return netlbl_domhsh_remove(domain, family, audit_info);
+	} else if (addr != NULL && mask != NULL) {
+		switch (family) {
+		case AF_INET:
+			return netlbl_domhsh_remove_af4(domain, addr, mask,
+							audit_info);
+#if IS_ENABLED(CONFIG_IPV6)
+		case AF_INET6:
+			return netlbl_domhsh_remove_af6(domain, addr, mask,
+							audit_info);
+#endif /* IPv6 */
+		default:
+			return -EPFNOSUPPORT;
+		}
+	} else
+		return -EINVAL;
+}
+
+/**
+ * netlbl_cfg_unlbl_map_add - Add a new unlabeled mapping
+ * @domain: the domain mapping to add
+ * @family: address family
+ * @addr: IP address
+ * @mask: IP address mask
+ * @audit_info: NetLabel audit information
+ *
+ * Description:
+ * Adds a new unlabeled NetLabel/LSM domain mapping.  A @domain value of NULL
+ * causes a new default domain mapping to be added.  Returns zero on success,
+ * negative values on failure.
+ *
+ */
+int netlbl_cfg_unlbl_map_add(const char *domain,
+			     u16 family,
+			     const void *addr,
+			     const void *mask,
+			     struct netlbl_audit *audit_info)
+{
+	int ret_val = -ENOMEM;
+	struct netlbl_dom_map *entry;
+	struct netlbl_domaddr_map *addrmap = NULL;
+	struct netlbl_domaddr4_map *map4 = NULL;
+	struct netlbl_domaddr6_map *map6 = NULL;
+
+	entry = kzalloc(sizeof(*entry), GFP_ATOMIC);
+	if (entry == NULL)
+		return -ENOMEM;
+	if (domain != NULL) {
+		entry->domain = kstrdup(domain, GFP_ATOMIC);
+		if (entry->domain == NULL)
+			goto cfg_unlbl_map_add_failure;
+	}
+	entry->family = family;
+
+	if (addr == NULL && mask == NULL)
+		entry->def.type = NETLBL_NLTYPE_UNLABELED;
+	else if (addr != NULL && mask != NULL) {
+		addrmap = kzalloc(sizeof(*addrmap), GFP_ATOMIC);
+		if (addrmap == NULL)
+			goto cfg_unlbl_map_add_failure;
+		INIT_LIST_HEAD(&addrmap->list4);
+		INIT_LIST_HEAD(&addrmap->list6);
+
+		switch (family) {
+		case AF_INET: {
+			const struct in_addr *addr4 = addr;
+			const struct in_addr *mask4 = mask;
+			map4 = kzalloc(sizeof(*map4), GFP_ATOMIC);
+			if (map4 == NULL)
+				goto cfg_unlbl_map_add_failure;
+			map4->def.type = NETLBL_NLTYPE_UNLABELED;
+			map4->list.addr = addr4->s_addr & mask4->s_addr;
+			map4->list.mask = mask4->s_addr;
+			map4->list.valid = 1;
+			ret_val = netlbl_af4list_add(&map4->list,
+						     &addrmap->list4);
+			if (ret_val != 0)
+				goto cfg_unlbl_map_add_failure;
+			break;
+			}
+#if IS_ENABLED(CONFIG_IPV6)
+		case AF_INET6: {
+			const struct in6_addr *addr6 = addr;
+			const struct in6_addr *mask6 = mask;
+			map6 = kzalloc(sizeof(*map6), GFP_ATOMIC);
+			if (map6 == NULL)
+				goto cfg_unlbl_map_add_failure;
+			map6->def.type = NETLBL_NLTYPE_UNLABELED;
+			map6->list.addr = *addr6;
+			map6->list.addr.s6_addr32[0] &= mask6->s6_addr32[0];
+			map6->list.addr.s6_addr32[1] &= mask6->s6_addr32[1];
+			map6->list.addr.s6_addr32[2] &= mask6->s6_addr32[2];
+			map6->list.addr.s6_addr32[3] &= mask6->s6_addr32[3];
+			map6->list.mask = *mask6;
+			map6->list.valid = 1;
+			ret_val = netlbl_af6list_add(&map6->list,
+						     &addrmap->list6);
+			if (ret_val != 0)
+				goto cfg_unlbl_map_add_failure;
+			break;
+			}
+#endif /* IPv6 */
+		default:
+			goto cfg_unlbl_map_add_failure;
+		}
+
+		entry->def.addrsel = addrmap;
+		entry->def.type = NETLBL_NLTYPE_ADDRSELECT;
+	} else {
+		ret_val = -EINVAL;
+		goto cfg_unlbl_map_add_failure;
+	}
+
+	ret_val = netlbl_domhsh_add(entry, audit_info);
+	if (ret_val != 0)
+		goto cfg_unlbl_map_add_failure;
+
+	return 0;
+
+cfg_unlbl_map_add_failure:
+	kfree(entry->domain);
+	kfree(entry);
+	kfree(addrmap);
+	kfree(map4);
+	kfree(map6);
+	return ret_val;
+}
+
+
+/**
+ * netlbl_cfg_unlbl_static_add - Adds a new static label
+ * @net: network namespace
+ * @dev_name: interface name
+ * @addr: IP address in network byte order (struct in[6]_addr)
+ * @mask: address mask in network byte order (struct in[6]_addr)
+ * @family: address family
+ * @secid: LSM secid value for the entry
+ * @audit_info: NetLabel audit information
+ *
+ * Description:
+ * Adds a new NetLabel static label to be used when protocol provided labels
+ * are not present on incoming traffic.  If @dev_name is NULL then the default
+ * interface will be used.  Returns zero on success, negative values on failure.
+ *
+ */
+int netlbl_cfg_unlbl_static_add(struct net *net,
+				const char *dev_name,
+				const void *addr,
+				const void *mask,
+				u16 family,
+				u32 secid,
+				struct netlbl_audit *audit_info)
+{
+	u32 addr_len;
+
+	switch (family) {
+	case AF_INET:
+		addr_len = sizeof(struct in_addr);
+		break;
+#if IS_ENABLED(CONFIG_IPV6)
+	case AF_INET6:
+		addr_len = sizeof(struct in6_addr);
+		break;
+#endif /* IPv6 */
+	default:
+		return -EPFNOSUPPORT;
+	}
+
+	return netlbl_unlhsh_add(net,
+				 dev_name, addr, mask, addr_len,
+				 secid, audit_info);
+}
+
+/**
+ * netlbl_cfg_unlbl_static_del - Removes an existing static label
+ * @net: network namespace
+ * @dev_name: interface name
+ * @addr: IP address in network byte order (struct in[6]_addr)
+ * @mask: address mask in network byte order (struct in[6]_addr)
+ * @family: address family
+ * @audit_info: NetLabel audit information
+ *
+ * Description:
+ * Removes an existing NetLabel static label used when protocol provided labels
+ * are not present on incoming traffic.  If @dev_name is NULL then the default
+ * interface will be used.  Returns zero on success, negative values on failure.
+ *
+ */
+int netlbl_cfg_unlbl_static_del(struct net *net,
+				const char *dev_name,
+				const void *addr,
+				const void *mask,
+				u16 family,
+				struct netlbl_audit *audit_info)
+{
+	u32 addr_len;
+
+	switch (family) {
+	case AF_INET:
+		addr_len = sizeof(struct in_addr);
+		break;
+#if IS_ENABLED(CONFIG_IPV6)
+	case AF_INET6:
+		addr_len = sizeof(struct in6_addr);
+		break;
+#endif /* IPv6 */
+	default:
+		return -EPFNOSUPPORT;
+	}
+
+	return netlbl_unlhsh_remove(net,
+				    dev_name, addr, mask, addr_len,
+				    audit_info);
+}
+
+/**
+ * netlbl_cfg_cipsov4_add - Add a new CIPSOv4 DOI definition
+ * @doi_def: CIPSO DOI definition
+ * @audit_info: NetLabel audit information
+ *
+ * Description:
+ * Add a new CIPSO DOI definition as defined by @doi_def.  Returns zero on
+ * success and negative values on failure.
+ *
+ */
+int netlbl_cfg_cipsov4_add(struct cipso_v4_doi *doi_def,
+			   struct netlbl_audit *audit_info)
+{
+	return cipso_v4_doi_add(doi_def, audit_info);
+}
+
+/**
+ * netlbl_cfg_cipsov4_del - Remove an existing CIPSOv4 DOI definition
+ * @doi: CIPSO DOI
+ * @audit_info: NetLabel audit information
+ *
+ * Description:
+ * Remove an existing CIPSO DOI definition matching @doi.  Returns zero on
+ * success and negative values on failure.
+ *
+ */
+void netlbl_cfg_cipsov4_del(u32 doi, struct netlbl_audit *audit_info)
+{
+	cipso_v4_doi_remove(doi, audit_info);
+}
+
+/**
+ * netlbl_cfg_cipsov4_map_add - Add a new CIPSOv4 DOI mapping
+ * @doi: the CIPSO DOI
+ * @domain: the domain mapping to add
+ * @addr: IP address
+ * @mask: IP address mask
+ * @audit_info: NetLabel audit information
+ *
+ * Description:
+ * Add a new NetLabel/LSM domain mapping for the given CIPSO DOI to the NetLabel
+ * subsystem.  A @domain value of NULL adds a new default domain mapping.
+ * Returns zero on success, negative values on failure.
+ *
+ */
+int netlbl_cfg_cipsov4_map_add(u32 doi,
+			       const char *domain,
+			       const struct in_addr *addr,
+			       const struct in_addr *mask,
+			       struct netlbl_audit *audit_info)
+{
+	int ret_val = -ENOMEM;
+	struct cipso_v4_doi *doi_def;
+	struct netlbl_dom_map *entry;
+	struct netlbl_domaddr_map *addrmap = NULL;
+	struct netlbl_domaddr4_map *addrinfo = NULL;
+
+	doi_def = cipso_v4_doi_getdef(doi);
+	if (doi_def == NULL)
+		return -ENOENT;
+
+	entry = kzalloc(sizeof(*entry), GFP_ATOMIC);
+	if (entry == NULL)
+		goto out_entry;
+	entry->family = AF_INET;
+	if (domain != NULL) {
+		entry->domain = kstrdup(domain, GFP_ATOMIC);
+		if (entry->domain == NULL)
+			goto out_domain;
+	}
+
+	if (addr == NULL && mask == NULL) {
+		entry->def.cipso = doi_def;
+		entry->def.type = NETLBL_NLTYPE_CIPSOV4;
+	} else if (addr != NULL && mask != NULL) {
+		addrmap = kzalloc(sizeof(*addrmap), GFP_ATOMIC);
+		if (addrmap == NULL)
+			goto out_addrmap;
+		INIT_LIST_HEAD(&addrmap->list4);
+		INIT_LIST_HEAD(&addrmap->list6);
+
+		addrinfo = kzalloc(sizeof(*addrinfo), GFP_ATOMIC);
+		if (addrinfo == NULL)
+			goto out_addrinfo;
+		addrinfo->def.cipso = doi_def;
+		addrinfo->def.type = NETLBL_NLTYPE_CIPSOV4;
+		addrinfo->list.addr = addr->s_addr & mask->s_addr;
+		addrinfo->list.mask = mask->s_addr;
+		addrinfo->list.valid = 1;
+		ret_val = netlbl_af4list_add(&addrinfo->list, &addrmap->list4);
+		if (ret_val != 0)
+			goto cfg_cipsov4_map_add_failure;
+
+		entry->def.addrsel = addrmap;
+		entry->def.type = NETLBL_NLTYPE_ADDRSELECT;
+	} else {
+		ret_val = -EINVAL;
+		goto out_addrmap;
+	}
+
+	ret_val = netlbl_domhsh_add(entry, audit_info);
+	if (ret_val != 0)
+		goto cfg_cipsov4_map_add_failure;
+
+	return 0;
+
+cfg_cipsov4_map_add_failure:
+	kfree(addrinfo);
+out_addrinfo:
+	kfree(addrmap);
+out_addrmap:
+	kfree(entry->domain);
+out_domain:
+	kfree(entry);
+out_entry:
+	cipso_v4_doi_putdef(doi_def);
+	return ret_val;
+}
+
+/**
+ * netlbl_cfg_calipso_add - Add a new CALIPSO DOI definition
+ * @doi_def: CALIPSO DOI definition
+ * @audit_info: NetLabel audit information
+ *
+ * Description:
+ * Add a new CALIPSO DOI definition as defined by @doi_def.  Returns zero on
+ * success and negative values on failure.
+ *
+ */
+int netlbl_cfg_calipso_add(struct calipso_doi *doi_def,
+			   struct netlbl_audit *audit_info)
+{
+#if IS_ENABLED(CONFIG_IPV6)
+	return calipso_doi_add(doi_def, audit_info);
+#else /* IPv6 */
+	return -ENOSYS;
+#endif /* IPv6 */
+}
+
+/**
+ * netlbl_cfg_calipso_del - Remove an existing CALIPSO DOI definition
+ * @doi: CALIPSO DOI
+ * @audit_info: NetLabel audit information
+ *
+ * Description:
+ * Remove an existing CALIPSO DOI definition matching @doi.  Returns zero on
+ * success and negative values on failure.
+ *
+ */
+void netlbl_cfg_calipso_del(u32 doi, struct netlbl_audit *audit_info)
+{
+#if IS_ENABLED(CONFIG_IPV6)
+	calipso_doi_remove(doi, audit_info);
+#endif /* IPv6 */
+}
+
+/**
+ * netlbl_cfg_calipso_map_add - Add a new CALIPSO DOI mapping
+ * @doi: the CALIPSO DOI
+ * @domain: the domain mapping to add
+ * @addr: IP address
+ * @mask: IP address mask
+ * @audit_info: NetLabel audit information
+ *
+ * Description:
+ * Add a new NetLabel/LSM domain mapping for the given CALIPSO DOI to the
+ * NetLabel subsystem.  A @domain value of NULL adds a new default domain
+ * mapping.  Returns zero on success, negative values on failure.
+ *
+ */
+int netlbl_cfg_calipso_map_add(u32 doi,
+			       const char *domain,
+			       const struct in6_addr *addr,
+			       const struct in6_addr *mask,
+			       struct netlbl_audit *audit_info)
+{
+#if IS_ENABLED(CONFIG_IPV6)
+	int ret_val = -ENOMEM;
+	struct calipso_doi *doi_def;
+	struct netlbl_dom_map *entry;
+	struct netlbl_domaddr_map *addrmap = NULL;
+	struct netlbl_domaddr6_map *addrinfo = NULL;
+
+	doi_def = calipso_doi_getdef(doi);
+	if (doi_def == NULL)
+		return -ENOENT;
+
+	entry = kzalloc(sizeof(*entry), GFP_ATOMIC);
+	if (entry == NULL)
+		goto out_entry;
+	entry->family = AF_INET6;
+	if (domain != NULL) {
+		entry->domain = kstrdup(domain, GFP_ATOMIC);
+		if (entry->domain == NULL)
+			goto out_domain;
+	}
+
+	if (addr == NULL && mask == NULL) {
+		entry->def.calipso = doi_def;
+		entry->def.type = NETLBL_NLTYPE_CALIPSO;
+	} else if (addr != NULL && mask != NULL) {
+		addrmap = kzalloc(sizeof(*addrmap), GFP_ATOMIC);
+		if (addrmap == NULL)
+			goto out_addrmap;
+		INIT_LIST_HEAD(&addrmap->list4);
+		INIT_LIST_HEAD(&addrmap->list6);
+
+		addrinfo = kzalloc(sizeof(*addrinfo), GFP_ATOMIC);
+		if (addrinfo == NULL)
+			goto out_addrinfo;
+		addrinfo->def.calipso = doi_def;
+		addrinfo->def.type = NETLBL_NLTYPE_CALIPSO;
+		addrinfo->list.addr = *addr;
+		addrinfo->list.addr.s6_addr32[0] &= mask->s6_addr32[0];
+		addrinfo->list.addr.s6_addr32[1] &= mask->s6_addr32[1];
+		addrinfo->list.addr.s6_addr32[2] &= mask->s6_addr32[2];
+		addrinfo->list.addr.s6_addr32[3] &= mask->s6_addr32[3];
+		addrinfo->list.mask = *mask;
+		addrinfo->list.valid = 1;
+		ret_val = netlbl_af6list_add(&addrinfo->list, &addrmap->list6);
+		if (ret_val != 0)
+			goto cfg_calipso_map_add_failure;
+
+		entry->def.addrsel = addrmap;
+		entry->def.type = NETLBL_NLTYPE_ADDRSELECT;
+	} else {
+		ret_val = -EINVAL;
+		goto out_addrmap;
+	}
+
+	ret_val = netlbl_domhsh_add(entry, audit_info);
+	if (ret_val != 0)
+		goto cfg_calipso_map_add_failure;
+
+	return 0;
+
+cfg_calipso_map_add_failure:
+	kfree(addrinfo);
+out_addrinfo:
+	kfree(addrmap);
+out_addrmap:
+	kfree(entry->domain);
+out_domain:
+	kfree(entry);
+out_entry:
+	calipso_doi_putdef(doi_def);
+	return ret_val;
+#else /* IPv6 */
+	return -ENOSYS;
+#endif /* IPv6 */
+}
+
+/*
+ * Security Attribute Functions
+ */
+
+#define _CM_F_NONE	0x00000000
+#define _CM_F_ALLOC	0x00000001
+#define _CM_F_WALK	0x00000002
+
+/**
+ * _netlbl_catmap_getnode - Get a individual node from a catmap
+ * @catmap: pointer to the category bitmap
+ * @offset: the requested offset
+ * @cm_flags: catmap flags, see _CM_F_*
+ * @gfp_flags: memory allocation flags
+ *
+ * Description:
+ * Iterate through the catmap looking for the node associated with @offset.
+ * If the _CM_F_ALLOC flag is set in @cm_flags and there is no associated node,
+ * one will be created and inserted into the catmap.  If the _CM_F_WALK flag is
+ * set in @cm_flags and there is no associated node, the next highest node will
+ * be returned.  Returns a pointer to the node on success, NULL on failure.
+ *
+ */
+static struct netlbl_lsm_catmap *_netlbl_catmap_getnode(
+					     struct netlbl_lsm_catmap **catmap,
+					     u32 offset,
+					     unsigned int cm_flags,
+					     gfp_t gfp_flags)
+{
+	struct netlbl_lsm_catmap *iter = *catmap;
+	struct netlbl_lsm_catmap *prev = NULL;
+
+	if (iter == NULL)
+		goto catmap_getnode_alloc;
+	if (offset < iter->startbit)
+		goto catmap_getnode_walk;
+	while (iter && offset >= (iter->startbit + NETLBL_CATMAP_SIZE)) {
+		prev = iter;
+		iter = iter->next;
+	}
+	if (iter == NULL || offset < iter->startbit)
+		goto catmap_getnode_walk;
+
+	return iter;
+
+catmap_getnode_walk:
+	if (cm_flags & _CM_F_WALK)
+		return iter;
+catmap_getnode_alloc:
+	if (!(cm_flags & _CM_F_ALLOC))
+		return NULL;
+
+	iter = netlbl_catmap_alloc(gfp_flags);
+	if (iter == NULL)
+		return NULL;
+	iter->startbit = offset & ~(NETLBL_CATMAP_SIZE - 1);
+
+	if (prev == NULL) {
+		iter->next = *catmap;
+		*catmap = iter;
+	} else {
+		iter->next = prev->next;
+		prev->next = iter;
+	}
+
+	return iter;
+}
+
+/**
+ * netlbl_catmap_walk - Walk a LSM secattr catmap looking for a bit
+ * @catmap: the category bitmap
+ * @offset: the offset to start searching at, in bits
+ *
+ * Description:
+ * This function walks a LSM secattr category bitmap starting at @offset and
+ * returns the spot of the first set bit or -ENOENT if no bits are set.
+ *
+ */
+int netlbl_catmap_walk(struct netlbl_lsm_catmap *catmap, u32 offset)
+{
+	struct netlbl_lsm_catmap *iter;
+	u32 idx;
+	u32 bit;
+	NETLBL_CATMAP_MAPTYPE bitmap;
+
+	iter = _netlbl_catmap_getnode(&catmap, offset, _CM_F_WALK, 0);
+	if (iter == NULL)
+		return -ENOENT;
+	if (offset > iter->startbit) {
+		offset -= iter->startbit;
+		idx = offset / NETLBL_CATMAP_MAPSIZE;
+		bit = offset % NETLBL_CATMAP_MAPSIZE;
+	} else {
+		idx = 0;
+		bit = 0;
+	}
+	bitmap = iter->bitmap[idx] >> bit;
+
+	for (;;) {
+		if (bitmap != 0) {
+			while ((bitmap & NETLBL_CATMAP_BIT) == 0) {
+				bitmap >>= 1;
+				bit++;
+			}
+			return iter->startbit +
+			       (NETLBL_CATMAP_MAPSIZE * idx) + bit;
+		}
+		if (++idx >= NETLBL_CATMAP_MAPCNT) {
+			if (iter->next != NULL) {
+				iter = iter->next;
+				idx = 0;
+			} else
+				return -ENOENT;
+		}
+		bitmap = iter->bitmap[idx];
+		bit = 0;
+	}
+
+	return -ENOENT;
+}
+EXPORT_SYMBOL(netlbl_catmap_walk);
+
+/**
+ * netlbl_catmap_walkrng - Find the end of a string of set bits
+ * @catmap: the category bitmap
+ * @offset: the offset to start searching at, in bits
+ *
+ * Description:
+ * This function walks a LSM secattr category bitmap starting at @offset and
+ * returns the spot of the first cleared bit or -ENOENT if the offset is past
+ * the end of the bitmap.
+ *
+ */
+int netlbl_catmap_walkrng(struct netlbl_lsm_catmap *catmap, u32 offset)
+{
+	struct netlbl_lsm_catmap *iter;
+	struct netlbl_lsm_catmap *prev = NULL;
+	u32 idx;
+	u32 bit;
+	NETLBL_CATMAP_MAPTYPE bitmask;
+	NETLBL_CATMAP_MAPTYPE bitmap;
+
+	iter = _netlbl_catmap_getnode(&catmap, offset, _CM_F_WALK, 0);
+	if (iter == NULL)
+		return -ENOENT;
+	if (offset > iter->startbit) {
+		offset -= iter->startbit;
+		idx = offset / NETLBL_CATMAP_MAPSIZE;
+		bit = offset % NETLBL_CATMAP_MAPSIZE;
+	} else {
+		idx = 0;
+		bit = 0;
+	}
+	bitmask = NETLBL_CATMAP_BIT << bit;
+
+	for (;;) {
+		bitmap = iter->bitmap[idx];
+		while (bitmask != 0 && (bitmap & bitmask) != 0) {
+			bitmask <<= 1;
+			bit++;
+		}
+
+		if (prev && idx == 0 && bit == 0)
+			return prev->startbit + NETLBL_CATMAP_SIZE - 1;
+		else if (bitmask != 0)
+			return iter->startbit +
+				(NETLBL_CATMAP_MAPSIZE * idx) + bit - 1;
+		else if (++idx >= NETLBL_CATMAP_MAPCNT) {
+			if (iter->next == NULL)
+				return iter->startbit + NETLBL_CATMAP_SIZE - 1;
+			prev = iter;
+			iter = iter->next;
+			idx = 0;
+		}
+		bitmask = NETLBL_CATMAP_BIT;
+		bit = 0;
+	}
+
+	return -ENOENT;
+}
+
+/**
+ * netlbl_catmap_getlong - Export an unsigned long bitmap
+ * @catmap: pointer to the category bitmap
+ * @offset: pointer to the requested offset
+ * @bitmap: the exported bitmap
+ *
+ * Description:
+ * Export a bitmap with an offset greater than or equal to @offset and return
+ * it in @bitmap.  The @offset must be aligned to an unsigned long and will be
+ * updated on return if different from what was requested; if the catmap is
+ * empty at the requested offset and beyond, the @offset is set to (u32)-1.
+ * Returns zero on sucess, negative values on failure.
+ *
+ */
+int netlbl_catmap_getlong(struct netlbl_lsm_catmap *catmap,
+			  u32 *offset,
+			  unsigned long *bitmap)
+{
+	struct netlbl_lsm_catmap *iter;
+	u32 off = *offset;
+	u32 idx;
+
+	/* only allow aligned offsets */
+	if ((off & (BITS_PER_LONG - 1)) != 0)
+		return -EINVAL;
+
+	/* a null catmap is equivalent to an empty one */
+	if (!catmap) {
+		*offset = (u32)-1;
+		return 0;
+	}
+
+	if (off < catmap->startbit) {
+		off = catmap->startbit;
+		*offset = off;
+	}
+	iter = _netlbl_catmap_getnode(&catmap, off, _CM_F_WALK, 0);
+	if (iter == NULL) {
+		*offset = (u32)-1;
+		return 0;
+	}
+
+	if (off < iter->startbit) {
+		*offset = iter->startbit;
+		off = 0;
+	} else
+		off -= iter->startbit;
+	idx = off / NETLBL_CATMAP_MAPSIZE;
+	*bitmap = iter->bitmap[idx] >> (off % NETLBL_CATMAP_MAPSIZE);
+
+	return 0;
+}
+
+/**
+ * netlbl_catmap_setbit - Set a bit in a LSM secattr catmap
+ * @catmap: pointer to the category bitmap
+ * @bit: the bit to set
+ * @flags: memory allocation flags
+ *
+ * Description:
+ * Set the bit specified by @bit in @catmap.  Returns zero on success,
+ * negative values on failure.
+ *
+ */
+int netlbl_catmap_setbit(struct netlbl_lsm_catmap **catmap,
+			 u32 bit,
+			 gfp_t flags)
+{
+	struct netlbl_lsm_catmap *iter;
+	u32 idx;
+
+	iter = _netlbl_catmap_getnode(catmap, bit, _CM_F_ALLOC, flags);
+	if (iter == NULL)
+		return -ENOMEM;
+
+	bit -= iter->startbit;
+	idx = bit / NETLBL_CATMAP_MAPSIZE;
+	iter->bitmap[idx] |= NETLBL_CATMAP_BIT << (bit % NETLBL_CATMAP_MAPSIZE);
+
+	return 0;
+}
+EXPORT_SYMBOL(netlbl_catmap_setbit);
+
+/**
+ * netlbl_catmap_setrng - Set a range of bits in a LSM secattr catmap
+ * @catmap: pointer to the category bitmap
+ * @start: the starting bit
+ * @end: the last bit in the string
+ * @flags: memory allocation flags
+ *
+ * Description:
+ * Set a range of bits, starting at @start and ending with @end.  Returns zero
+ * on success, negative values on failure.
+ *
+ */
+int netlbl_catmap_setrng(struct netlbl_lsm_catmap **catmap,
+			 u32 start,
+			 u32 end,
+			 gfp_t flags)
+{
+	int rc = 0;
+	u32 spot = start;
+
+	while (rc == 0 && spot <= end) {
+		if (((spot & (BITS_PER_LONG - 1)) == 0) &&
+		    ((end - spot) > BITS_PER_LONG)) {
+			rc = netlbl_catmap_setlong(catmap,
+						   spot,
+						   (unsigned long)-1,
+						   flags);
+			spot += BITS_PER_LONG;
+		} else
+			rc = netlbl_catmap_setbit(catmap, spot++, flags);
+	}
+
+	return rc;
+}
+
+/**
+ * netlbl_catmap_setlong - Import an unsigned long bitmap
+ * @catmap: pointer to the category bitmap
+ * @offset: offset to the start of the imported bitmap
+ * @bitmap: the bitmap to import
+ * @flags: memory allocation flags
+ *
+ * Description:
+ * Import the bitmap specified in @bitmap into @catmap, using the offset
+ * in @offset.  The offset must be aligned to an unsigned long.  Returns zero
+ * on success, negative values on failure.
+ *
+ */
+int netlbl_catmap_setlong(struct netlbl_lsm_catmap **catmap,
+			  u32 offset,
+			  unsigned long bitmap,
+			  gfp_t flags)
+{
+	struct netlbl_lsm_catmap *iter;
+	u32 idx;
+
+	/* only allow aligned offsets */
+	if ((offset & (BITS_PER_LONG - 1)) != 0)
+		return -EINVAL;
+
+	iter = _netlbl_catmap_getnode(catmap, offset, _CM_F_ALLOC, flags);
+	if (iter == NULL)
+		return -ENOMEM;
+
+	offset -= iter->startbit;
+	idx = offset / NETLBL_CATMAP_MAPSIZE;
+	iter->bitmap[idx] |= (NETLBL_CATMAP_MAPTYPE)bitmap
+			     << (offset % NETLBL_CATMAP_MAPSIZE);
+
+	return 0;
+}
+
+/* Bitmap functions
+ */
+
+/**
+ * netlbl_bitmap_walk - Walk a bitmap looking for a bit
+ * @bitmap: the bitmap
+ * @bitmap_len: length in bits
+ * @offset: starting offset
+ * @state: if non-zero, look for a set (1) bit else look for a cleared (0) bit
+ *
+ * Description:
+ * Starting at @offset, walk the bitmap from left to right until either the
+ * desired bit is found or we reach the end.  Return the bit offset, -1 if
+ * not found, or -2 if error.
+ */
+int netlbl_bitmap_walk(const unsigned char *bitmap, u32 bitmap_len,
+		       u32 offset, u8 state)
+{
+	u32 bit_spot;
+	u32 byte_offset;
+	unsigned char bitmask;
+	unsigned char byte;
+
+	if (offset >= bitmap_len)
+		return -1;
+	byte_offset = offset / 8;
+	byte = bitmap[byte_offset];
+	bit_spot = offset;
+	bitmask = 0x80 >> (offset % 8);
+
+	while (bit_spot < bitmap_len) {
+		if ((state && (byte & bitmask) == bitmask) ||
+		    (state == 0 && (byte & bitmask) == 0))
+			return bit_spot;
+
+		if (++bit_spot >= bitmap_len)
+			return -1;
+		bitmask >>= 1;
+		if (bitmask == 0) {
+			byte = bitmap[++byte_offset];
+			bitmask = 0x80;
+		}
+	}
+
+	return -1;
+}
+EXPORT_SYMBOL(netlbl_bitmap_walk);
+
+/**
+ * netlbl_bitmap_setbit - Sets a single bit in a bitmap
+ * @bitmap: the bitmap
+ * @bit: the bit
+ * @state: if non-zero, set the bit (1) else clear the bit (0)
+ *
+ * Description:
+ * Set a single bit in the bitmask.  Returns zero on success, negative values
+ * on error.
+ */
+void netlbl_bitmap_setbit(unsigned char *bitmap, u32 bit, u8 state)
+{
+	u32 byte_spot;
+	u8 bitmask;
+
+	/* gcc always rounds to zero when doing integer division */
+	byte_spot = bit / 8;
+	bitmask = 0x80 >> (bit % 8);
+	if (state)
+		bitmap[byte_spot] |= bitmask;
+	else
+		bitmap[byte_spot] &= ~bitmask;
+}
+EXPORT_SYMBOL(netlbl_bitmap_setbit);
+
+/*
+ * LSM Functions
+ */
+
+/**
+ * netlbl_enabled - Determine if the NetLabel subsystem is enabled
+ *
+ * Description:
+ * The LSM can use this function to determine if it should use NetLabel
+ * security attributes in it's enforcement mechanism.  Currently, NetLabel is
+ * considered to be enabled when it's configuration contains a valid setup for
+ * at least one labeled protocol (i.e. NetLabel can understand incoming
+ * labeled packets of at least one type); otherwise NetLabel is considered to
+ * be disabled.
+ *
+ */
+int netlbl_enabled(void)
+{
+	/* At some point we probably want to expose this mechanism to the user
+	 * as well so that admins can toggle NetLabel regardless of the
+	 * configuration */
+	return (atomic_read(&netlabel_mgmt_protocount) > 0);
+}
+
+/**
+ * netlbl_sock_setattr - Label a socket using the correct protocol
+ * @sk: the socket to label
+ * @family: protocol family
+ * @secattr: the security attributes
+ *
+ * Description:
+ * Attach the correct label to the given socket using the security attributes
+ * specified in @secattr.  This function requires exclusive access to @sk,
+ * which means it either needs to be in the process of being created or locked.
+ * Returns zero on success, -EDESTADDRREQ if the domain is configured to use
+ * network address selectors (can't blindly label the socket), and negative
+ * values on all other failures.
+ *
+ */
+int netlbl_sock_setattr(struct sock *sk,
+			u16 family,
+			const struct netlbl_lsm_secattr *secattr)
+{
+	int ret_val;
+	struct netlbl_dom_map *dom_entry;
+
+	rcu_read_lock();
+	dom_entry = netlbl_domhsh_getentry(secattr->domain, family);
+	if (dom_entry == NULL) {
+		ret_val = -ENOENT;
+		goto socket_setattr_return;
+	}
+	switch (family) {
+	case AF_INET:
+		switch (dom_entry->def.type) {
+		case NETLBL_NLTYPE_ADDRSELECT:
+			ret_val = -EDESTADDRREQ;
+			break;
+		case NETLBL_NLTYPE_CIPSOV4:
+			ret_val = cipso_v4_sock_setattr(sk,
+							dom_entry->def.cipso,
+							secattr);
+			break;
+		case NETLBL_NLTYPE_UNLABELED:
+			ret_val = 0;
+			break;
+		default:
+			ret_val = -ENOENT;
+		}
+		break;
+#if IS_ENABLED(CONFIG_IPV6)
+	case AF_INET6:
+		switch (dom_entry->def.type) {
+		case NETLBL_NLTYPE_ADDRSELECT:
+			ret_val = -EDESTADDRREQ;
+			break;
+		case NETLBL_NLTYPE_CALIPSO:
+			ret_val = calipso_sock_setattr(sk,
+						       dom_entry->def.calipso,
+						       secattr);
+			break;
+		case NETLBL_NLTYPE_UNLABELED:
+			ret_val = 0;
+			break;
+		default:
+			ret_val = -ENOENT;
+		}
+		break;
+#endif /* IPv6 */
+	default:
+		ret_val = -EPROTONOSUPPORT;
+	}
+
+socket_setattr_return:
+	rcu_read_unlock();
+	return ret_val;
+}
+
+/**
+ * netlbl_sock_delattr - Delete all the NetLabel labels on a socket
+ * @sk: the socket
+ *
+ * Description:
+ * Remove all the NetLabel labeling from @sk.  The caller is responsible for
+ * ensuring that @sk is locked.
+ *
+ */
+void netlbl_sock_delattr(struct sock *sk)
+{
+	switch (sk->sk_family) {
+	case AF_INET:
+		cipso_v4_sock_delattr(sk);
+		break;
+#if IS_ENABLED(CONFIG_IPV6)
+	case AF_INET6:
+		calipso_sock_delattr(sk);
+		break;
+#endif /* IPv6 */
+	}
+}
+
+/**
+ * netlbl_sock_getattr - Determine the security attributes of a sock
+ * @sk: the sock
+ * @secattr: the security attributes
+ *
+ * Description:
+ * Examines the given sock to see if any NetLabel style labeling has been
+ * applied to the sock, if so it parses the socket label and returns the
+ * security attributes in @secattr.  Returns zero on success, negative values
+ * on failure.
+ *
+ */
+int netlbl_sock_getattr(struct sock *sk,
+			struct netlbl_lsm_secattr *secattr)
+{
+	int ret_val;
+
+	switch (sk->sk_family) {
+	case AF_INET:
+		ret_val = cipso_v4_sock_getattr(sk, secattr);
+		break;
+#if IS_ENABLED(CONFIG_IPV6)
+	case AF_INET6:
+		ret_val = calipso_sock_getattr(sk, secattr);
+		break;
+#endif /* IPv6 */
+	default:
+		ret_val = -EPROTONOSUPPORT;
+	}
+
+	return ret_val;
+}
+
+/**
+ * netlbl_conn_setattr - Label a connected socket using the correct protocol
+ * @sk: the socket to label
+ * @addr: the destination address
+ * @secattr: the security attributes
+ *
+ * Description:
+ * Attach the correct label to the given connected socket using the security
+ * attributes specified in @secattr.  The caller is responsible for ensuring
+ * that @sk is locked.  Returns zero on success, negative values on failure.
+ *
+ */
+int netlbl_conn_setattr(struct sock *sk,
+			struct sockaddr *addr,
+			const struct netlbl_lsm_secattr *secattr)
+{
+	int ret_val;
+	struct sockaddr_in *addr4;
+#if IS_ENABLED(CONFIG_IPV6)
+	struct sockaddr_in6 *addr6;
+#endif
+	struct netlbl_dommap_def *entry;
+
+	rcu_read_lock();
+	switch (addr->sa_family) {
+	case AF_INET:
+		addr4 = (struct sockaddr_in *)addr;
+		entry = netlbl_domhsh_getentry_af4(secattr->domain,
+						   addr4->sin_addr.s_addr);
+		if (entry == NULL) {
+			ret_val = -ENOENT;
+			goto conn_setattr_return;
+		}
+		switch (entry->type) {
+		case NETLBL_NLTYPE_CIPSOV4:
+			ret_val = cipso_v4_sock_setattr(sk,
+							entry->cipso, secattr);
+			break;
+		case NETLBL_NLTYPE_UNLABELED:
+			/* just delete the protocols we support for right now
+			 * but we could remove other protocols if needed */
+			netlbl_sock_delattr(sk);
+			ret_val = 0;
+			break;
+		default:
+			ret_val = -ENOENT;
+		}
+		break;
+#if IS_ENABLED(CONFIG_IPV6)
+	case AF_INET6:
+		addr6 = (struct sockaddr_in6 *)addr;
+		entry = netlbl_domhsh_getentry_af6(secattr->domain,
+						   &addr6->sin6_addr);
+		if (entry == NULL) {
+			ret_val = -ENOENT;
+			goto conn_setattr_return;
+		}
+		switch (entry->type) {
+		case NETLBL_NLTYPE_CALIPSO:
+			ret_val = calipso_sock_setattr(sk,
+						       entry->calipso, secattr);
+			break;
+		case NETLBL_NLTYPE_UNLABELED:
+			/* just delete the protocols we support for right now
+			 * but we could remove other protocols if needed */
+			netlbl_sock_delattr(sk);
+			ret_val = 0;
+			break;
+		default:
+			ret_val = -ENOENT;
+		}
+		break;
+#endif /* IPv6 */
+	default:
+		ret_val = -EPROTONOSUPPORT;
+	}
+
+conn_setattr_return:
+	rcu_read_unlock();
+	return ret_val;
+}
+
+/**
+ * netlbl_req_setattr - Label a request socket using the correct protocol
+ * @req: the request socket to label
+ * @secattr: the security attributes
+ *
+ * Description:
+ * Attach the correct label to the given socket using the security attributes
+ * specified in @secattr.  Returns zero on success, negative values on failure.
+ *
+ */
+int netlbl_req_setattr(struct request_sock *req,
+		       const struct netlbl_lsm_secattr *secattr)
+{
+	int ret_val;
+	struct netlbl_dommap_def *entry;
+	struct inet_request_sock *ireq = inet_rsk(req);
+
+	rcu_read_lock();
+	switch (req->rsk_ops->family) {
+	case AF_INET:
+		entry = netlbl_domhsh_getentry_af4(secattr->domain,
+						   ireq->ir_rmt_addr);
+		if (entry == NULL) {
+			ret_val = -ENOENT;
+			goto req_setattr_return;
+		}
+		switch (entry->type) {
+		case NETLBL_NLTYPE_CIPSOV4:
+			ret_val = cipso_v4_req_setattr(req,
+						       entry->cipso, secattr);
+			break;
+		case NETLBL_NLTYPE_UNLABELED:
+			netlbl_req_delattr(req);
+			ret_val = 0;
+			break;
+		default:
+			ret_val = -ENOENT;
+		}
+		break;
+#if IS_ENABLED(CONFIG_IPV6)
+	case AF_INET6:
+		entry = netlbl_domhsh_getentry_af6(secattr->domain,
+						   &ireq->ir_v6_rmt_addr);
+		if (entry == NULL) {
+			ret_val = -ENOENT;
+			goto req_setattr_return;
+		}
+		switch (entry->type) {
+		case NETLBL_NLTYPE_CALIPSO:
+			ret_val = calipso_req_setattr(req,
+						      entry->calipso, secattr);
+			break;
+		case NETLBL_NLTYPE_UNLABELED:
+			netlbl_req_delattr(req);
+			ret_val = 0;
+			break;
+		default:
+			ret_val = -ENOENT;
+		}
+		break;
+#endif /* IPv6 */
+	default:
+		ret_val = -EPROTONOSUPPORT;
+	}
+
+req_setattr_return:
+	rcu_read_unlock();
+	return ret_val;
+}
+
+/**
+* netlbl_req_delattr - Delete all the NetLabel labels on a socket
+* @req: the socket
+*
+* Description:
+* Remove all the NetLabel labeling from @req.
+*
+*/
+void netlbl_req_delattr(struct request_sock *req)
+{
+	switch (req->rsk_ops->family) {
+	case AF_INET:
+		cipso_v4_req_delattr(req);
+		break;
+#if IS_ENABLED(CONFIG_IPV6)
+	case AF_INET6:
+		calipso_req_delattr(req);
+		break;
+#endif /* IPv6 */
+	}
+}
+
+/**
+ * netlbl_skbuff_setattr - Label a packet using the correct protocol
+ * @skb: the packet
+ * @family: protocol family
+ * @secattr: the security attributes
+ *
+ * Description:
+ * Attach the correct label to the given packet using the security attributes
+ * specified in @secattr.  Returns zero on success, negative values on failure.
+ *
+ */
+int netlbl_skbuff_setattr(struct sk_buff *skb,
+			  u16 family,
+			  const struct netlbl_lsm_secattr *secattr)
+{
+	int ret_val;
+	struct iphdr *hdr4;
+#if IS_ENABLED(CONFIG_IPV6)
+	struct ipv6hdr *hdr6;
+#endif
+	struct netlbl_dommap_def *entry;
+
+	rcu_read_lock();
+	switch (family) {
+	case AF_INET:
+		hdr4 = ip_hdr(skb);
+		entry = netlbl_domhsh_getentry_af4(secattr->domain,
+						   hdr4->daddr);
+		if (entry == NULL) {
+			ret_val = -ENOENT;
+			goto skbuff_setattr_return;
+		}
+		switch (entry->type) {
+		case NETLBL_NLTYPE_CIPSOV4:
+			ret_val = cipso_v4_skbuff_setattr(skb, entry->cipso,
+							  secattr);
+			break;
+		case NETLBL_NLTYPE_UNLABELED:
+			/* just delete the protocols we support for right now
+			 * but we could remove other protocols if needed */
+			ret_val = cipso_v4_skbuff_delattr(skb);
+			break;
+		default:
+			ret_val = -ENOENT;
+		}
+		break;
+#if IS_ENABLED(CONFIG_IPV6)
+	case AF_INET6:
+		hdr6 = ipv6_hdr(skb);
+		entry = netlbl_domhsh_getentry_af6(secattr->domain,
+						   &hdr6->daddr);
+		if (entry == NULL) {
+			ret_val = -ENOENT;
+			goto skbuff_setattr_return;
+		}
+		switch (entry->type) {
+		case NETLBL_NLTYPE_CALIPSO:
+			ret_val = calipso_skbuff_setattr(skb, entry->calipso,
+							 secattr);
+			break;
+		case NETLBL_NLTYPE_UNLABELED:
+			/* just delete the protocols we support for right now
+			 * but we could remove other protocols if needed */
+			ret_val = calipso_skbuff_delattr(skb);
+			break;
+		default:
+			ret_val = -ENOENT;
+		}
+		break;
+#endif /* IPv6 */
+	default:
+		ret_val = -EPROTONOSUPPORT;
+	}
+
+skbuff_setattr_return:
+	rcu_read_unlock();
+	return ret_val;
+}
+
+/**
+ * netlbl_skbuff_getattr - Determine the security attributes of a packet
+ * @skb: the packet
+ * @family: protocol family
+ * @secattr: the security attributes
+ *
+ * Description:
+ * Examines the given packet to see if a recognized form of packet labeling
+ * is present, if so it parses the packet label and returns the security
+ * attributes in @secattr.  Returns zero on success, negative values on
+ * failure.
+ *
+ */
+int netlbl_skbuff_getattr(const struct sk_buff *skb,
+			  u16 family,
+			  struct netlbl_lsm_secattr *secattr)
+{
+	unsigned char *ptr;
+
+	switch (family) {
+	case AF_INET:
+		ptr = cipso_v4_optptr(skb);
+		if (ptr && cipso_v4_getattr(ptr, secattr) == 0)
+			return 0;
+		break;
+#if IS_ENABLED(CONFIG_IPV6)
+	case AF_INET6:
+		ptr = calipso_optptr(skb);
+		if (ptr && calipso_getattr(ptr, secattr) == 0)
+			return 0;
+		break;
+#endif /* IPv6 */
+	}
+
+	return netlbl_unlabel_getattr(skb, family, secattr);
+}
+
+/**
+ * netlbl_skbuff_err - Handle a LSM error on a sk_buff
+ * @skb: the packet
+ * @family: the family
+ * @error: the error code
+ * @gateway: true if host is acting as a gateway, false otherwise
+ *
+ * Description:
+ * Deal with a LSM problem when handling the packet in @skb, typically this is
+ * a permission denied problem (-EACCES).  The correct action is determined
+ * according to the packet's labeling protocol.
+ *
+ */
+void netlbl_skbuff_err(struct sk_buff *skb, u16 family, int error, int gateway)
+{
+	switch (family) {
+	case AF_INET:
+		if (cipso_v4_optptr(skb))
+			cipso_v4_error(skb, error, gateway);
+		break;
+	}
+}
+
+/**
+ * netlbl_cache_invalidate - Invalidate all of the NetLabel protocol caches
+ *
+ * Description:
+ * For all of the NetLabel protocols that support some form of label mapping
+ * cache, invalidate the cache.  Returns zero on success, negative values on
+ * error.
+ *
+ */
+void netlbl_cache_invalidate(void)
+{
+	cipso_v4_cache_invalidate();
+#if IS_ENABLED(CONFIG_IPV6)
+	calipso_cache_invalidate();
+#endif /* IPv6 */
+}
+
+/**
+ * netlbl_cache_add - Add an entry to a NetLabel protocol cache
+ * @skb: the packet
+ * @family: the family
+ * @secattr: the packet's security attributes
+ *
+ * Description:
+ * Add the LSM security attributes for the given packet to the underlying
+ * NetLabel protocol's label mapping cache.  Returns zero on success, negative
+ * values on error.
+ *
+ */
+int netlbl_cache_add(const struct sk_buff *skb, u16 family,
+		     const struct netlbl_lsm_secattr *secattr)
+{
+	unsigned char *ptr;
+
+	if ((secattr->flags & NETLBL_SECATTR_CACHE) == 0)
+		return -ENOMSG;
+
+	switch (family) {
+	case AF_INET:
+		ptr = cipso_v4_optptr(skb);
+		if (ptr)
+			return cipso_v4_cache_add(ptr, secattr);
+		break;
+#if IS_ENABLED(CONFIG_IPV6)
+	case AF_INET6:
+		ptr = calipso_optptr(skb);
+		if (ptr)
+			return calipso_cache_add(ptr, secattr);
+		break;
+#endif /* IPv6 */
+	}
+	return -ENOMSG;
+}
+
+/*
+ * Protocol Engine Functions
+ */
+
+/**
+ * netlbl_audit_start - Start an audit message
+ * @type: audit message type
+ * @audit_info: NetLabel audit information
+ *
+ * Description:
+ * Start an audit message using the type specified in @type and fill the audit
+ * message with some fields common to all NetLabel audit messages.  This
+ * function should only be used by protocol engines, not LSMs.  Returns a
+ * pointer to the audit buffer on success, NULL on failure.
+ *
+ */
+struct audit_buffer *netlbl_audit_start(int type,
+					struct netlbl_audit *audit_info)
+{
+	return netlbl_audit_start_common(type, audit_info);
+}
+EXPORT_SYMBOL(netlbl_audit_start);
+
+/*
+ * Setup Functions
+ */
+
+/**
+ * netlbl_init - Initialize NetLabel
+ *
+ * Description:
+ * Perform the required NetLabel initialization before first use.
+ *
+ */
+static int __init netlbl_init(void)
+{
+	int ret_val;
+
+	printk(KERN_INFO "NetLabel: Initializing\n");
+	printk(KERN_INFO "NetLabel:  domain hash size = %u\n",
+	       (1 << NETLBL_DOMHSH_BITSIZE));
+	printk(KERN_INFO "NetLabel:  protocols = UNLABELED CIPSOv4 CALIPSO\n");
+
+	ret_val = netlbl_domhsh_init(NETLBL_DOMHSH_BITSIZE);
+	if (ret_val != 0)
+		goto init_failure;
+
+	ret_val = netlbl_unlabel_init(NETLBL_UNLHSH_BITSIZE);
+	if (ret_val != 0)
+		goto init_failure;
+
+	ret_val = netlbl_netlink_init();
+	if (ret_val != 0)
+		goto init_failure;
+
+	ret_val = netlbl_unlabel_defconf();
+	if (ret_val != 0)
+		goto init_failure;
+	printk(KERN_INFO "NetLabel:  unlabeled traffic allowed by default\n");
+
+	return 0;
+
+init_failure:
+	panic("NetLabel: failed to initialize properly (%d)\n", ret_val);
+}
+
+subsys_initcall(netlbl_init);
diff --git a/net/netlabel/netlabel_mgmt.c b/net/netlabel/netlabel_mgmt.c
new file mode 100644
index 000000000..750a7a842
--- /dev/null
+++ b/net/netlabel/netlabel_mgmt.c
@@ -0,0 +1,846 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * NetLabel Management Support
+ *
+ * This file defines the management functions 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
+ */
+
+#include <linux/types.h>
+#include <linux/socket.h>
+#include <linux/string.h>
+#include <linux/skbuff.h>
+#include <linux/in.h>
+#include <linux/in6.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/netlabel.h>
+#include <net/cipso_ipv4.h>
+#include <net/calipso.h>
+#include <linux/atomic.h>
+
+#include "netlabel_calipso.h"
+#include "netlabel_domainhash.h"
+#include "netlabel_user.h"
+#include "netlabel_mgmt.h"
+
+/* NetLabel configured protocol counter */
+atomic_t netlabel_mgmt_protocount = ATOMIC_INIT(0);
+
+/* Argument struct for netlbl_domhsh_walk() */
+struct netlbl_domhsh_walk_arg {
+	struct netlink_callback *nl_cb;
+	struct sk_buff *skb;
+	u32 seq;
+};
+
+/* NetLabel Generic NETLINK CIPSOv4 family */
+static struct genl_family netlbl_mgmt_gnl_family;
+
+/* NetLabel Netlink attribute policy */
+static const struct nla_policy netlbl_mgmt_genl_policy[NLBL_MGMT_A_MAX + 1] = {
+	[NLBL_MGMT_A_DOMAIN] = { .type = NLA_NUL_STRING },
+	[NLBL_MGMT_A_PROTOCOL] = { .type = NLA_U32 },
+	[NLBL_MGMT_A_VERSION] = { .type = NLA_U32 },
+	[NLBL_MGMT_A_CV4DOI] = { .type = NLA_U32 },
+	[NLBL_MGMT_A_FAMILY] = { .type = NLA_U16 },
+	[NLBL_MGMT_A_CLPDOI] = { .type = NLA_U32 },
+};
+
+/*
+ * Helper Functions
+ */
+
+/**
+ * netlbl_mgmt_add - Handle an ADD message
+ * @info: the Generic NETLINK info block
+ * @audit_info: NetLabel audit information
+ *
+ * Description:
+ * Helper function for the ADD and ADDDEF messages to add the domain mappings
+ * from the message to the hash table.  See netlabel.h for a description of the
+ * message format.  Returns zero on success, negative values on failure.
+ *
+ */
+static int netlbl_mgmt_add_common(struct genl_info *info,
+				  struct netlbl_audit *audit_info)
+{
+	void *pmap = NULL;
+	int ret_val = -EINVAL;
+	struct netlbl_domaddr_map *addrmap = NULL;
+	struct cipso_v4_doi *cipsov4 = NULL;
+#if IS_ENABLED(CONFIG_IPV6)
+	struct calipso_doi *calipso = NULL;
+#endif
+	u32 tmp_val;
+	struct netlbl_dom_map *entry = kzalloc(sizeof(*entry), GFP_KERNEL);
+
+	if (!entry)
+		return -ENOMEM;
+	entry->def.type = nla_get_u32(info->attrs[NLBL_MGMT_A_PROTOCOL]);
+	if (info->attrs[NLBL_MGMT_A_DOMAIN]) {
+		size_t tmp_size = nla_len(info->attrs[NLBL_MGMT_A_DOMAIN]);
+		entry->domain = kmalloc(tmp_size, GFP_KERNEL);
+		if (entry->domain == NULL) {
+			ret_val = -ENOMEM;
+			goto add_free_entry;
+		}
+		nla_strlcpy(entry->domain,
+			    info->attrs[NLBL_MGMT_A_DOMAIN], tmp_size);
+	}
+
+	/* NOTE: internally we allow/use a entry->def.type value of
+	 *       NETLBL_NLTYPE_ADDRSELECT but we don't currently allow users
+	 *       to pass that as a protocol value because we need to know the
+	 *       "real" protocol */
+
+	switch (entry->def.type) {
+	case NETLBL_NLTYPE_UNLABELED:
+		if (info->attrs[NLBL_MGMT_A_FAMILY])
+			entry->family =
+				nla_get_u16(info->attrs[NLBL_MGMT_A_FAMILY]);
+		else
+			entry->family = AF_UNSPEC;
+		break;
+	case NETLBL_NLTYPE_CIPSOV4:
+		if (!info->attrs[NLBL_MGMT_A_CV4DOI])
+			goto add_free_domain;
+
+		tmp_val = nla_get_u32(info->attrs[NLBL_MGMT_A_CV4DOI]);
+		cipsov4 = cipso_v4_doi_getdef(tmp_val);
+		if (cipsov4 == NULL)
+			goto add_free_domain;
+		entry->family = AF_INET;
+		entry->def.cipso = cipsov4;
+		break;
+#if IS_ENABLED(CONFIG_IPV6)
+	case NETLBL_NLTYPE_CALIPSO:
+		if (!info->attrs[NLBL_MGMT_A_CLPDOI])
+			goto add_free_domain;
+
+		tmp_val = nla_get_u32(info->attrs[NLBL_MGMT_A_CLPDOI]);
+		calipso = calipso_doi_getdef(tmp_val);
+		if (calipso == NULL)
+			goto add_free_domain;
+		entry->family = AF_INET6;
+		entry->def.calipso = calipso;
+		break;
+#endif /* IPv6 */
+	default:
+		goto add_free_domain;
+	}
+
+	if ((entry->family == AF_INET && info->attrs[NLBL_MGMT_A_IPV6ADDR]) ||
+	    (entry->family == AF_INET6 && info->attrs[NLBL_MGMT_A_IPV4ADDR]))
+		goto add_doi_put_def;
+
+	if (info->attrs[NLBL_MGMT_A_IPV4ADDR]) {
+		struct in_addr *addr;
+		struct in_addr *mask;
+		struct netlbl_domaddr4_map *map;
+
+		addrmap = kzalloc(sizeof(*addrmap), GFP_KERNEL);
+		if (addrmap == NULL) {
+			ret_val = -ENOMEM;
+			goto add_doi_put_def;
+		}
+		INIT_LIST_HEAD(&addrmap->list4);
+		INIT_LIST_HEAD(&addrmap->list6);
+
+		if (nla_len(info->attrs[NLBL_MGMT_A_IPV4ADDR]) !=
+		    sizeof(struct in_addr)) {
+			ret_val = -EINVAL;
+			goto add_free_addrmap;
+		}
+		if (nla_len(info->attrs[NLBL_MGMT_A_IPV4MASK]) !=
+		    sizeof(struct in_addr)) {
+			ret_val = -EINVAL;
+			goto add_free_addrmap;
+		}
+		addr = nla_data(info->attrs[NLBL_MGMT_A_IPV4ADDR]);
+		mask = nla_data(info->attrs[NLBL_MGMT_A_IPV4MASK]);
+
+		map = kzalloc(sizeof(*map), GFP_KERNEL);
+		if (map == NULL) {
+			ret_val = -ENOMEM;
+			goto add_free_addrmap;
+		}
+		pmap = map;
+		map->list.addr = addr->s_addr & mask->s_addr;
+		map->list.mask = mask->s_addr;
+		map->list.valid = 1;
+		map->def.type = entry->def.type;
+		if (cipsov4)
+			map->def.cipso = cipsov4;
+
+		ret_val = netlbl_af4list_add(&map->list, &addrmap->list4);
+		if (ret_val != 0)
+			goto add_free_map;
+
+		entry->family = AF_INET;
+		entry->def.type = NETLBL_NLTYPE_ADDRSELECT;
+		entry->def.addrsel = addrmap;
+#if IS_ENABLED(CONFIG_IPV6)
+	} else if (info->attrs[NLBL_MGMT_A_IPV6ADDR]) {
+		struct in6_addr *addr;
+		struct in6_addr *mask;
+		struct netlbl_domaddr6_map *map;
+
+		addrmap = kzalloc(sizeof(*addrmap), GFP_KERNEL);
+		if (addrmap == NULL) {
+			ret_val = -ENOMEM;
+			goto add_doi_put_def;
+		}
+		INIT_LIST_HEAD(&addrmap->list4);
+		INIT_LIST_HEAD(&addrmap->list6);
+
+		if (nla_len(info->attrs[NLBL_MGMT_A_IPV6ADDR]) !=
+		    sizeof(struct in6_addr)) {
+			ret_val = -EINVAL;
+			goto add_free_addrmap;
+		}
+		if (nla_len(info->attrs[NLBL_MGMT_A_IPV6MASK]) !=
+		    sizeof(struct in6_addr)) {
+			ret_val = -EINVAL;
+			goto add_free_addrmap;
+		}
+		addr = nla_data(info->attrs[NLBL_MGMT_A_IPV6ADDR]);
+		mask = nla_data(info->attrs[NLBL_MGMT_A_IPV6MASK]);
+
+		map = kzalloc(sizeof(*map), GFP_KERNEL);
+		if (map == NULL) {
+			ret_val = -ENOMEM;
+			goto add_free_addrmap;
+		}
+		pmap = map;
+		map->list.addr = *addr;
+		map->list.addr.s6_addr32[0] &= mask->s6_addr32[0];
+		map->list.addr.s6_addr32[1] &= mask->s6_addr32[1];
+		map->list.addr.s6_addr32[2] &= mask->s6_addr32[2];
+		map->list.addr.s6_addr32[3] &= mask->s6_addr32[3];
+		map->list.mask = *mask;
+		map->list.valid = 1;
+		map->def.type = entry->def.type;
+		if (calipso)
+			map->def.calipso = calipso;
+
+		ret_val = netlbl_af6list_add(&map->list, &addrmap->list6);
+		if (ret_val != 0)
+			goto add_free_map;
+
+		entry->family = AF_INET6;
+		entry->def.type = NETLBL_NLTYPE_ADDRSELECT;
+		entry->def.addrsel = addrmap;
+#endif /* IPv6 */
+	}
+
+	ret_val = netlbl_domhsh_add(entry, audit_info);
+	if (ret_val != 0)
+		goto add_free_map;
+
+	return 0;
+
+add_free_map:
+	kfree(pmap);
+add_free_addrmap:
+	kfree(addrmap);
+add_doi_put_def:
+	cipso_v4_doi_putdef(cipsov4);
+#if IS_ENABLED(CONFIG_IPV6)
+	calipso_doi_putdef(calipso);
+#endif
+add_free_domain:
+	kfree(entry->domain);
+add_free_entry:
+	kfree(entry);
+	return ret_val;
+}
+
+/**
+ * netlbl_mgmt_listentry - List a NetLabel/LSM domain map entry
+ * @skb: the NETLINK buffer
+ * @entry: the map entry
+ *
+ * Description:
+ * This function is a helper function used by the LISTALL and LISTDEF command
+ * handlers.  The caller is responsible for ensuring that the RCU read lock
+ * is held.  Returns zero on success, negative values on failure.
+ *
+ */
+static int netlbl_mgmt_listentry(struct sk_buff *skb,
+				 struct netlbl_dom_map *entry)
+{
+	int ret_val = 0;
+	struct nlattr *nla_a;
+	struct nlattr *nla_b;
+	struct netlbl_af4list *iter4;
+#if IS_ENABLED(CONFIG_IPV6)
+	struct netlbl_af6list *iter6;
+#endif
+
+	if (entry->domain != NULL) {
+		ret_val = nla_put_string(skb,
+					 NLBL_MGMT_A_DOMAIN, entry->domain);
+		if (ret_val != 0)
+			return ret_val;
+	}
+
+	ret_val = nla_put_u16(skb, NLBL_MGMT_A_FAMILY, entry->family);
+	if (ret_val != 0)
+		return ret_val;
+
+	switch (entry->def.type) {
+	case NETLBL_NLTYPE_ADDRSELECT:
+		nla_a = nla_nest_start_noflag(skb, NLBL_MGMT_A_SELECTORLIST);
+		if (nla_a == NULL)
+			return -ENOMEM;
+
+		netlbl_af4list_foreach_rcu(iter4, &entry->def.addrsel->list4) {
+			struct netlbl_domaddr4_map *map4;
+			struct in_addr addr_struct;
+
+			nla_b = nla_nest_start_noflag(skb,
+						      NLBL_MGMT_A_ADDRSELECTOR);
+			if (nla_b == NULL)
+				return -ENOMEM;
+
+			addr_struct.s_addr = iter4->addr;
+			ret_val = nla_put_in_addr(skb, NLBL_MGMT_A_IPV4ADDR,
+						  addr_struct.s_addr);
+			if (ret_val != 0)
+				return ret_val;
+			addr_struct.s_addr = iter4->mask;
+			ret_val = nla_put_in_addr(skb, NLBL_MGMT_A_IPV4MASK,
+						  addr_struct.s_addr);
+			if (ret_val != 0)
+				return ret_val;
+			map4 = netlbl_domhsh_addr4_entry(iter4);
+			ret_val = nla_put_u32(skb, NLBL_MGMT_A_PROTOCOL,
+					      map4->def.type);
+			if (ret_val != 0)
+				return ret_val;
+			switch (map4->def.type) {
+			case NETLBL_NLTYPE_CIPSOV4:
+				ret_val = nla_put_u32(skb, NLBL_MGMT_A_CV4DOI,
+						      map4->def.cipso->doi);
+				if (ret_val != 0)
+					return ret_val;
+				break;
+			}
+
+			nla_nest_end(skb, nla_b);
+		}
+#if IS_ENABLED(CONFIG_IPV6)
+		netlbl_af6list_foreach_rcu(iter6, &entry->def.addrsel->list6) {
+			struct netlbl_domaddr6_map *map6;
+
+			nla_b = nla_nest_start_noflag(skb,
+						      NLBL_MGMT_A_ADDRSELECTOR);
+			if (nla_b == NULL)
+				return -ENOMEM;
+
+			ret_val = nla_put_in6_addr(skb, NLBL_MGMT_A_IPV6ADDR,
+						   &iter6->addr);
+			if (ret_val != 0)
+				return ret_val;
+			ret_val = nla_put_in6_addr(skb, NLBL_MGMT_A_IPV6MASK,
+						   &iter6->mask);
+			if (ret_val != 0)
+				return ret_val;
+			map6 = netlbl_domhsh_addr6_entry(iter6);
+			ret_val = nla_put_u32(skb, NLBL_MGMT_A_PROTOCOL,
+					      map6->def.type);
+			if (ret_val != 0)
+				return ret_val;
+
+			switch (map6->def.type) {
+			case NETLBL_NLTYPE_CALIPSO:
+				ret_val = nla_put_u32(skb, NLBL_MGMT_A_CLPDOI,
+						      map6->def.calipso->doi);
+				if (ret_val != 0)
+					return ret_val;
+				break;
+			}
+
+			nla_nest_end(skb, nla_b);
+		}
+#endif /* IPv6 */
+
+		nla_nest_end(skb, nla_a);
+		break;
+	case NETLBL_NLTYPE_UNLABELED:
+		ret_val = nla_put_u32(skb, NLBL_MGMT_A_PROTOCOL,
+				      entry->def.type);
+		break;
+	case NETLBL_NLTYPE_CIPSOV4:
+		ret_val = nla_put_u32(skb, NLBL_MGMT_A_PROTOCOL,
+				      entry->def.type);
+		if (ret_val != 0)
+			return ret_val;
+		ret_val = nla_put_u32(skb, NLBL_MGMT_A_CV4DOI,
+				      entry->def.cipso->doi);
+		break;
+	case NETLBL_NLTYPE_CALIPSO:
+		ret_val = nla_put_u32(skb, NLBL_MGMT_A_PROTOCOL,
+				      entry->def.type);
+		if (ret_val != 0)
+			return ret_val;
+		ret_val = nla_put_u32(skb, NLBL_MGMT_A_CLPDOI,
+				      entry->def.calipso->doi);
+		break;
+	}
+
+	return ret_val;
+}
+
+/*
+ * NetLabel Command Handlers
+ */
+
+/**
+ * netlbl_mgmt_add - Handle an ADD message
+ * @skb: the NETLINK buffer
+ * @info: the Generic NETLINK info block
+ *
+ * Description:
+ * Process a user generated ADD message and add the domains from the message
+ * to the hash table.  See netlabel.h for a description of the message format.
+ * Returns zero on success, negative values on failure.
+ *
+ */
+static int netlbl_mgmt_add(struct sk_buff *skb, struct genl_info *info)
+{
+	struct netlbl_audit audit_info;
+
+	if ((!info->attrs[NLBL_MGMT_A_DOMAIN]) ||
+	    (!info->attrs[NLBL_MGMT_A_PROTOCOL]) ||
+	    (info->attrs[NLBL_MGMT_A_IPV4ADDR] &&
+	     info->attrs[NLBL_MGMT_A_IPV6ADDR]) ||
+	    (info->attrs[NLBL_MGMT_A_IPV4MASK] &&
+	     info->attrs[NLBL_MGMT_A_IPV6MASK]) ||
+	    ((info->attrs[NLBL_MGMT_A_IPV4ADDR] != NULL) ^
+	     (info->attrs[NLBL_MGMT_A_IPV4MASK] != NULL)) ||
+	    ((info->attrs[NLBL_MGMT_A_IPV6ADDR] != NULL) ^
+	     (info->attrs[NLBL_MGMT_A_IPV6MASK] != NULL)))
+		return -EINVAL;
+
+	netlbl_netlink_auditinfo(&audit_info);
+
+	return netlbl_mgmt_add_common(info, &audit_info);
+}
+
+/**
+ * netlbl_mgmt_remove - Handle a REMOVE message
+ * @skb: the NETLINK buffer
+ * @info: the Generic NETLINK info block
+ *
+ * Description:
+ * Process a user generated REMOVE message and remove the specified domain
+ * mappings.  Returns zero on success, negative values on failure.
+ *
+ */
+static int netlbl_mgmt_remove(struct sk_buff *skb, struct genl_info *info)
+{
+	char *domain;
+	struct netlbl_audit audit_info;
+
+	if (!info->attrs[NLBL_MGMT_A_DOMAIN])
+		return -EINVAL;
+
+	netlbl_netlink_auditinfo(&audit_info);
+
+	domain = nla_data(info->attrs[NLBL_MGMT_A_DOMAIN]);
+	return netlbl_domhsh_remove(domain, AF_UNSPEC, &audit_info);
+}
+
+/**
+ * netlbl_mgmt_listall_cb - netlbl_domhsh_walk() callback for LISTALL
+ * @entry: the domain mapping hash table entry
+ * @arg: the netlbl_domhsh_walk_arg structure
+ *
+ * Description:
+ * This function is designed to be used as a callback to the
+ * netlbl_domhsh_walk() function for use in generating a response for a LISTALL
+ * message.  Returns the size of the message on success, negative values on
+ * failure.
+ *
+ */
+static int netlbl_mgmt_listall_cb(struct netlbl_dom_map *entry, void *arg)
+{
+	int ret_val = -ENOMEM;
+	struct netlbl_domhsh_walk_arg *cb_arg = arg;
+	void *data;
+
+	data = genlmsg_put(cb_arg->skb, NETLINK_CB(cb_arg->nl_cb->skb).portid,
+			   cb_arg->seq, &netlbl_mgmt_gnl_family,
+			   NLM_F_MULTI, NLBL_MGMT_C_LISTALL);
+	if (data == NULL)
+		goto listall_cb_failure;
+
+	ret_val = netlbl_mgmt_listentry(cb_arg->skb, entry);
+	if (ret_val != 0)
+		goto listall_cb_failure;
+
+	cb_arg->seq++;
+	genlmsg_end(cb_arg->skb, data);
+	return 0;
+
+listall_cb_failure:
+	genlmsg_cancel(cb_arg->skb, data);
+	return ret_val;
+}
+
+/**
+ * netlbl_mgmt_listall - Handle a LISTALL message
+ * @skb: the NETLINK buffer
+ * @cb: the NETLINK callback
+ *
+ * Description:
+ * Process a user generated LISTALL message and dumps the domain hash table in
+ * a form suitable for use in a kernel generated LISTALL message.  Returns zero
+ * on success, negative values on failure.
+ *
+ */
+static int netlbl_mgmt_listall(struct sk_buff *skb,
+			       struct netlink_callback *cb)
+{
+	struct netlbl_domhsh_walk_arg cb_arg;
+	u32 skip_bkt = cb->args[0];
+	u32 skip_chain = cb->args[1];
+
+	cb_arg.nl_cb = cb;
+	cb_arg.skb = skb;
+	cb_arg.seq = cb->nlh->nlmsg_seq;
+
+	netlbl_domhsh_walk(&skip_bkt,
+			   &skip_chain,
+			   netlbl_mgmt_listall_cb,
+			   &cb_arg);
+
+	cb->args[0] = skip_bkt;
+	cb->args[1] = skip_chain;
+	return skb->len;
+}
+
+/**
+ * netlbl_mgmt_adddef - Handle an ADDDEF message
+ * @skb: the NETLINK buffer
+ * @info: the Generic NETLINK info block
+ *
+ * Description:
+ * Process a user generated ADDDEF message and respond accordingly.  Returns
+ * zero on success, negative values on failure.
+ *
+ */
+static int netlbl_mgmt_adddef(struct sk_buff *skb, struct genl_info *info)
+{
+	struct netlbl_audit audit_info;
+
+	if ((!info->attrs[NLBL_MGMT_A_PROTOCOL]) ||
+	    (info->attrs[NLBL_MGMT_A_IPV4ADDR] &&
+	     info->attrs[NLBL_MGMT_A_IPV6ADDR]) ||
+	    (info->attrs[NLBL_MGMT_A_IPV4MASK] &&
+	     info->attrs[NLBL_MGMT_A_IPV6MASK]) ||
+	    ((info->attrs[NLBL_MGMT_A_IPV4ADDR] != NULL) ^
+	     (info->attrs[NLBL_MGMT_A_IPV4MASK] != NULL)) ||
+	    ((info->attrs[NLBL_MGMT_A_IPV6ADDR] != NULL) ^
+	     (info->attrs[NLBL_MGMT_A_IPV6MASK] != NULL)))
+		return -EINVAL;
+
+	netlbl_netlink_auditinfo(&audit_info);
+
+	return netlbl_mgmt_add_common(info, &audit_info);
+}
+
+/**
+ * netlbl_mgmt_removedef - Handle a REMOVEDEF message
+ * @skb: the NETLINK buffer
+ * @info: the Generic NETLINK info block
+ *
+ * Description:
+ * Process a user generated REMOVEDEF message and remove the default domain
+ * mapping.  Returns zero on success, negative values on failure.
+ *
+ */
+static int netlbl_mgmt_removedef(struct sk_buff *skb, struct genl_info *info)
+{
+	struct netlbl_audit audit_info;
+
+	netlbl_netlink_auditinfo(&audit_info);
+
+	return netlbl_domhsh_remove_default(AF_UNSPEC, &audit_info);
+}
+
+/**
+ * netlbl_mgmt_listdef - Handle a LISTDEF message
+ * @skb: the NETLINK buffer
+ * @info: the Generic NETLINK info block
+ *
+ * Description:
+ * Process a user generated LISTDEF message and dumps the default domain
+ * mapping in a form suitable for use in a kernel generated LISTDEF message.
+ * Returns zero on success, negative values on failure.
+ *
+ */
+static int netlbl_mgmt_listdef(struct sk_buff *skb, struct genl_info *info)
+{
+	int ret_val = -ENOMEM;
+	struct sk_buff *ans_skb = NULL;
+	void *data;
+	struct netlbl_dom_map *entry;
+	u16 family;
+
+	if (info->attrs[NLBL_MGMT_A_FAMILY])
+		family = nla_get_u16(info->attrs[NLBL_MGMT_A_FAMILY]);
+	else
+		family = AF_INET;
+
+	ans_skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
+	if (ans_skb == NULL)
+		return -ENOMEM;
+	data = genlmsg_put_reply(ans_skb, info, &netlbl_mgmt_gnl_family,
+				 0, NLBL_MGMT_C_LISTDEF);
+	if (data == NULL)
+		goto listdef_failure;
+
+	rcu_read_lock();
+	entry = netlbl_domhsh_getentry(NULL, family);
+	if (entry == NULL) {
+		ret_val = -ENOENT;
+		goto listdef_failure_lock;
+	}
+	ret_val = netlbl_mgmt_listentry(ans_skb, entry);
+	rcu_read_unlock();
+	if (ret_val != 0)
+		goto listdef_failure;
+
+	genlmsg_end(ans_skb, data);
+	return genlmsg_reply(ans_skb, info);
+
+listdef_failure_lock:
+	rcu_read_unlock();
+listdef_failure:
+	kfree_skb(ans_skb);
+	return ret_val;
+}
+
+/**
+ * netlbl_mgmt_protocols_cb - Write an individual PROTOCOL message response
+ * @skb: the skb to write to
+ * @cb: the NETLINK callback
+ * @protocol: the NetLabel protocol to use in the message
+ *
+ * Description:
+ * This function is to be used in conjunction with netlbl_mgmt_protocols() to
+ * answer a application's PROTOCOLS message.  Returns the size of the message
+ * on success, negative values on failure.
+ *
+ */
+static int netlbl_mgmt_protocols_cb(struct sk_buff *skb,
+				    struct netlink_callback *cb,
+				    u32 protocol)
+{
+	int ret_val = -ENOMEM;
+	void *data;
+
+	data = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
+			   &netlbl_mgmt_gnl_family, NLM_F_MULTI,
+			   NLBL_MGMT_C_PROTOCOLS);
+	if (data == NULL)
+		goto protocols_cb_failure;
+
+	ret_val = nla_put_u32(skb, NLBL_MGMT_A_PROTOCOL, protocol);
+	if (ret_val != 0)
+		goto protocols_cb_failure;
+
+	genlmsg_end(skb, data);
+	return 0;
+
+protocols_cb_failure:
+	genlmsg_cancel(skb, data);
+	return ret_val;
+}
+
+/**
+ * netlbl_mgmt_protocols - Handle a PROTOCOLS message
+ * @skb: the NETLINK buffer
+ * @cb: the NETLINK callback
+ *
+ * Description:
+ * Process a user generated PROTOCOLS message and respond accordingly.
+ *
+ */
+static int netlbl_mgmt_protocols(struct sk_buff *skb,
+				 struct netlink_callback *cb)
+{
+	u32 protos_sent = cb->args[0];
+
+	if (protos_sent == 0) {
+		if (netlbl_mgmt_protocols_cb(skb,
+					     cb,
+					     NETLBL_NLTYPE_UNLABELED) < 0)
+			goto protocols_return;
+		protos_sent++;
+	}
+	if (protos_sent == 1) {
+		if (netlbl_mgmt_protocols_cb(skb,
+					     cb,
+					     NETLBL_NLTYPE_CIPSOV4) < 0)
+			goto protocols_return;
+		protos_sent++;
+	}
+#if IS_ENABLED(CONFIG_IPV6)
+	if (protos_sent == 2) {
+		if (netlbl_mgmt_protocols_cb(skb,
+					     cb,
+					     NETLBL_NLTYPE_CALIPSO) < 0)
+			goto protocols_return;
+		protos_sent++;
+	}
+#endif
+
+protocols_return:
+	cb->args[0] = protos_sent;
+	return skb->len;
+}
+
+/**
+ * netlbl_mgmt_version - Handle a VERSION message
+ * @skb: the NETLINK buffer
+ * @info: the Generic NETLINK info block
+ *
+ * Description:
+ * Process a user generated VERSION message and respond accordingly.  Returns
+ * zero on success, negative values on failure.
+ *
+ */
+static int netlbl_mgmt_version(struct sk_buff *skb, struct genl_info *info)
+{
+	int ret_val = -ENOMEM;
+	struct sk_buff *ans_skb = NULL;
+	void *data;
+
+	ans_skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
+	if (ans_skb == NULL)
+		return -ENOMEM;
+	data = genlmsg_put_reply(ans_skb, info, &netlbl_mgmt_gnl_family,
+				 0, NLBL_MGMT_C_VERSION);
+	if (data == NULL)
+		goto version_failure;
+
+	ret_val = nla_put_u32(ans_skb,
+			      NLBL_MGMT_A_VERSION,
+			      NETLBL_PROTO_VERSION);
+	if (ret_val != 0)
+		goto version_failure;
+
+	genlmsg_end(ans_skb, data);
+	return genlmsg_reply(ans_skb, info);
+
+version_failure:
+	kfree_skb(ans_skb);
+	return ret_val;
+}
+
+
+/*
+ * NetLabel Generic NETLINK Command Definitions
+ */
+
+static const struct genl_small_ops netlbl_mgmt_genl_ops[] = {
+	{
+	.cmd = NLBL_MGMT_C_ADD,
+	.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
+	.flags = GENL_ADMIN_PERM,
+	.doit = netlbl_mgmt_add,
+	.dumpit = NULL,
+	},
+	{
+	.cmd = NLBL_MGMT_C_REMOVE,
+	.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
+	.flags = GENL_ADMIN_PERM,
+	.doit = netlbl_mgmt_remove,
+	.dumpit = NULL,
+	},
+	{
+	.cmd = NLBL_MGMT_C_LISTALL,
+	.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
+	.flags = 0,
+	.doit = NULL,
+	.dumpit = netlbl_mgmt_listall,
+	},
+	{
+	.cmd = NLBL_MGMT_C_ADDDEF,
+	.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
+	.flags = GENL_ADMIN_PERM,
+	.doit = netlbl_mgmt_adddef,
+	.dumpit = NULL,
+	},
+	{
+	.cmd = NLBL_MGMT_C_REMOVEDEF,
+	.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
+	.flags = GENL_ADMIN_PERM,
+	.doit = netlbl_mgmt_removedef,
+	.dumpit = NULL,
+	},
+	{
+	.cmd = NLBL_MGMT_C_LISTDEF,
+	.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
+	.flags = 0,
+	.doit = netlbl_mgmt_listdef,
+	.dumpit = NULL,
+	},
+	{
+	.cmd = NLBL_MGMT_C_PROTOCOLS,
+	.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
+	.flags = 0,
+	.doit = NULL,
+	.dumpit = netlbl_mgmt_protocols,
+	},
+	{
+	.cmd = NLBL_MGMT_C_VERSION,
+	.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
+	.flags = 0,
+	.doit = netlbl_mgmt_version,
+	.dumpit = NULL,
+	},
+};
+
+static struct genl_family netlbl_mgmt_gnl_family __ro_after_init = {
+	.hdrsize = 0,
+	.name = NETLBL_NLTYPE_MGMT_NAME,
+	.version = NETLBL_PROTO_VERSION,
+	.maxattr = NLBL_MGMT_A_MAX,
+	.policy = netlbl_mgmt_genl_policy,
+	.module = THIS_MODULE,
+	.small_ops = netlbl_mgmt_genl_ops,
+	.n_small_ops = ARRAY_SIZE(netlbl_mgmt_genl_ops),
+};
+
+/*
+ * NetLabel Generic NETLINK Protocol Functions
+ */
+
+/**
+ * netlbl_mgmt_genl_init - Register the NetLabel management component
+ *
+ * Description:
+ * Register the NetLabel management component with the Generic NETLINK
+ * mechanism.  Returns zero on success, negative values on failure.
+ *
+ */
+int __init netlbl_mgmt_genl_init(void)
+{
+	return genl_register_family(&netlbl_mgmt_gnl_family);
+}
diff --git a/net/netlabel/netlabel_mgmt.h b/net/netlabel/netlabel_mgmt.h
new file mode 100644
index 000000000..db20dfbbd
--- /dev/null
+++ b/net/netlabel/netlabel_mgmt.h
@@ -0,0 +1,225 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * NetLabel Management Support
+ *
+ * This file defines the management functions 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
+ */
+
+#ifndef _NETLABEL_MGMT_H
+#define _NETLABEL_MGMT_H
+
+#include <net/netlabel.h>
+#include <linux/atomic.h>
+
+/*
+ * The following NetLabel payloads are supported by the management interface.
+ *
+ * o ADD:
+ *   Sent by an application to add a domain mapping to the NetLabel system.
+ *
+ *   Required attributes:
+ *
+ *     NLBL_MGMT_A_DOMAIN
+ *     NLBL_MGMT_A_PROTOCOL
+ *
+ *   If IPv4 is specified the following attributes are required:
+ *
+ *     NLBL_MGMT_A_IPV4ADDR
+ *     NLBL_MGMT_A_IPV4MASK
+ *
+ *   If IPv6 is specified the following attributes are required:
+ *
+ *     NLBL_MGMT_A_IPV6ADDR
+ *     NLBL_MGMT_A_IPV6MASK
+ *
+ *   If using NETLBL_NLTYPE_CIPSOV4 the following attributes are required:
+ *
+ *     NLBL_MGMT_A_CV4DOI
+ *
+ *   If using NETLBL_NLTYPE_UNLABELED no other attributes are required,
+ *   however the following attribute may optionally be sent:
+ *
+ *     NLBL_MGMT_A_FAMILY
+ *
+ * o REMOVE:
+ *   Sent by an application to remove a domain mapping from the NetLabel
+ *   system.
+ *
+ *   Required attributes:
+ *
+ *     NLBL_MGMT_A_DOMAIN
+ *
+ * o LISTALL:
+ *   This message can be sent either from an application or by the kernel in
+ *   response to an application generated LISTALL message.  When sent by an
+ *   application there is no payload and the NLM_F_DUMP flag should be set.
+ *   The kernel should respond with a series of the following messages.
+ *
+ *   Required attributes:
+ *
+ *     NLBL_MGMT_A_DOMAIN
+ *     NLBL_MGMT_A_FAMILY
+ *
+ *   If the IP address selectors are not used the following attribute is
+ *   required:
+ *
+ *     NLBL_MGMT_A_PROTOCOL
+ *
+ *   If the IP address selectors are used then the following attritbute is
+ *   required:
+ *
+ *     NLBL_MGMT_A_SELECTORLIST
+ *
+ *   If the mapping is using the NETLBL_NLTYPE_CIPSOV4 type then the following
+ *   attributes are required:
+ *
+ *     NLBL_MGMT_A_CV4DOI
+ *
+ *   If the mapping is using the NETLBL_NLTYPE_UNLABELED type no other
+ *   attributes are required.
+ *
+ * o ADDDEF:
+ *   Sent by an application to set the default domain mapping for the NetLabel
+ *   system.
+ *
+ *   Required attributes:
+ *
+ *     NLBL_MGMT_A_PROTOCOL
+ *
+ *   If using NETLBL_NLTYPE_CIPSOV4 the following attributes are required:
+ *
+ *     NLBL_MGMT_A_CV4DOI
+ *
+ *   If using NETLBL_NLTYPE_UNLABELED no other attributes are required,
+ *   however the following attribute may optionally be sent:
+ *
+ *     NLBL_MGMT_A_FAMILY
+ *
+ * o REMOVEDEF:
+ *   Sent by an application to remove the default domain mapping from the
+ *   NetLabel system, there is no payload.
+ *
+ * o LISTDEF:
+ *   This message can be sent either from an application or by the kernel in
+ *   response to an application generated LISTDEF message.  When sent by an
+ *   application there may be an optional payload.
+ *
+ *     NLBL_MGMT_A_FAMILY
+ *
+ *   On success the kernel should send a response using the following format:
+ *
+ *   If the IP address selectors are not used the following attributes are
+ *   required:
+ *
+ *     NLBL_MGMT_A_PROTOCOL
+ *     NLBL_MGMT_A_FAMILY
+ *
+ *   If the IP address selectors are used then the following attritbute is
+ *   required:
+ *
+ *     NLBL_MGMT_A_SELECTORLIST
+ *
+ *   If the mapping is using the NETLBL_NLTYPE_CIPSOV4 type then the following
+ *   attributes are required:
+ *
+ *     NLBL_MGMT_A_CV4DOI
+ *
+ *   If the mapping is using the NETLBL_NLTYPE_UNLABELED type no other
+ *   attributes are required.
+ *
+ * o PROTOCOLS:
+ *   Sent by an application to request a list of configured NetLabel protocols
+ *   in the kernel.  When sent by an application there is no payload and the
+ *   NLM_F_DUMP flag should be set.  The kernel should respond with a series of
+ *   the following messages.
+ *
+ *   Required attributes:
+ *
+ *     NLBL_MGMT_A_PROTOCOL
+ *
+ * o VERSION:
+ *   Sent by an application to request the NetLabel version.  When sent by an
+ *   application there is no payload.  This message type is also used by the
+ *   kernel to respond to an VERSION request.
+ *
+ *   Required attributes:
+ *
+ *     NLBL_MGMT_A_VERSION
+ *
+ */
+
+/* NetLabel Management commands */
+enum {
+	NLBL_MGMT_C_UNSPEC,
+	NLBL_MGMT_C_ADD,
+	NLBL_MGMT_C_REMOVE,
+	NLBL_MGMT_C_LISTALL,
+	NLBL_MGMT_C_ADDDEF,
+	NLBL_MGMT_C_REMOVEDEF,
+	NLBL_MGMT_C_LISTDEF,
+	NLBL_MGMT_C_PROTOCOLS,
+	NLBL_MGMT_C_VERSION,
+	__NLBL_MGMT_C_MAX,
+};
+
+/* NetLabel Management attributes */
+enum {
+	NLBL_MGMT_A_UNSPEC,
+	NLBL_MGMT_A_DOMAIN,
+	/* (NLA_NUL_STRING)
+	 * the NULL terminated LSM domain string */
+	NLBL_MGMT_A_PROTOCOL,
+	/* (NLA_U32)
+	 * the NetLabel protocol type (defined by NETLBL_NLTYPE_*) */
+	NLBL_MGMT_A_VERSION,
+	/* (NLA_U32)
+	 * the NetLabel protocol version number (defined by
+	 * NETLBL_PROTO_VERSION) */
+	NLBL_MGMT_A_CV4DOI,
+	/* (NLA_U32)
+	 * the CIPSOv4 DOI value */
+	NLBL_MGMT_A_IPV6ADDR,
+	/* (NLA_BINARY, struct in6_addr)
+	 * an IPv6 address */
+	NLBL_MGMT_A_IPV6MASK,
+	/* (NLA_BINARY, struct in6_addr)
+	 * an IPv6 address mask */
+	NLBL_MGMT_A_IPV4ADDR,
+	/* (NLA_BINARY, struct in_addr)
+	 * an IPv4 address */
+	NLBL_MGMT_A_IPV4MASK,
+	/* (NLA_BINARY, struct in_addr)
+	 * and IPv4 address mask */
+	NLBL_MGMT_A_ADDRSELECTOR,
+	/* (NLA_NESTED)
+	 * an IP address selector, must contain an address, mask, and protocol
+	 * attribute plus any protocol specific attributes */
+	NLBL_MGMT_A_SELECTORLIST,
+	/* (NLA_NESTED)
+	 * the selector list, there must be at least one
+	 * NLBL_MGMT_A_ADDRSELECTOR attribute */
+	NLBL_MGMT_A_FAMILY,
+	/* (NLA_U16)
+	 * The address family */
+	NLBL_MGMT_A_CLPDOI,
+	/* (NLA_U32)
+	 * the CALIPSO DOI value */
+	__NLBL_MGMT_A_MAX,
+};
+#define NLBL_MGMT_A_MAX (__NLBL_MGMT_A_MAX - 1)
+
+/* NetLabel protocol functions */
+int netlbl_mgmt_genl_init(void);
+
+/* NetLabel configured protocol reference counter */
+extern atomic_t netlabel_mgmt_protocount;
+
+#endif
diff --git a/net/netlabel/netlabel_unlabeled.c b/net/netlabel/netlabel_unlabeled.c
new file mode 100644
index 000000000..3049fff0b
--- /dev/null
+++ b/net/netlabel/netlabel_unlabeled.c
@@ -0,0 +1,1558 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * 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
+ */
+
+#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 __rcu *netlbl_unlhsh;
+static struct netlbl_unlhsh_iface __rcu *netlbl_unlhsh_def;
+
+/* Accept unlabeled packets flag */
+static u8 netlabel_unlabel_acceptflg;
+
+/* NetLabel Generic NETLINK unlabeled family */
+static struct genl_family netlbl_unlabel_gnl_family;
+
+/* 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,
+				lockdep_is_held(&netlbl_unlhsh_lock))
+		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] &&
+	    info->attrs[NLBL_UNLABEL_A_IPV4MASK]) {
+		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(&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(&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(&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(&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(&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 skip_addr4 = cb->args[2];
+	u32 iter_bkt, 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)
+	u32 skip_addr6 = cb->args[3];
+	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_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++ < skip_addr4)
+					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;
+				}
+			}
+			iter_addr4 = 0;
+			skip_addr4 = 0;
+#if IS_ENABLED(CONFIG_IPV6)
+			netlbl_af6list_foreach_rcu(addr6,
+						   &iface->addr6_list) {
+				if (iter_addr6++ < skip_addr6)
+					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;
+				}
+			}
+			iter_addr6 = 0;
+			skip_addr6 = 0;
+#endif /* IPv6 */
+		}
+		iter_chain = 0;
+		skip_chain = 0;
+	}
+
+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_small_ops netlbl_unlabel_genl_ops[] = {
+	{
+	.cmd = NLBL_UNLABEL_C_STATICADD,
+	.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
+	.flags = GENL_ADMIN_PERM,
+	.doit = netlbl_unlabel_staticadd,
+	.dumpit = NULL,
+	},
+	{
+	.cmd = NLBL_UNLABEL_C_STATICREMOVE,
+	.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
+	.flags = GENL_ADMIN_PERM,
+	.doit = netlbl_unlabel_staticremove,
+	.dumpit = NULL,
+	},
+	{
+	.cmd = NLBL_UNLABEL_C_STATICLIST,
+	.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
+	.flags = 0,
+	.doit = NULL,
+	.dumpit = netlbl_unlabel_staticlist,
+	},
+	{
+	.cmd = NLBL_UNLABEL_C_STATICADDDEF,
+	.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
+	.flags = GENL_ADMIN_PERM,
+	.doit = netlbl_unlabel_staticadddef,
+	.dumpit = NULL,
+	},
+	{
+	.cmd = NLBL_UNLABEL_C_STATICREMOVEDEF,
+	.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
+	.flags = GENL_ADMIN_PERM,
+	.doit = netlbl_unlabel_staticremovedef,
+	.dumpit = NULL,
+	},
+	{
+	.cmd = NLBL_UNLABEL_C_STATICLISTDEF,
+	.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
+	.flags = 0,
+	.doit = NULL,
+	.dumpit = netlbl_unlabel_staticlistdef,
+	},
+	{
+	.cmd = NLBL_UNLABEL_C_ACCEPT,
+	.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
+	.flags = GENL_ADMIN_PERM,
+	.doit = netlbl_unlabel_accept,
+	.dumpit = NULL,
+	},
+	{
+	.cmd = NLBL_UNLABEL_C_LIST,
+	.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
+	.flags = 0,
+	.doit = netlbl_unlabel_list,
+	.dumpit = NULL,
+	},
+};
+
+static struct genl_family netlbl_unlabel_gnl_family __ro_after_init = {
+	.hdrsize = 0,
+	.name = NETLBL_NLTYPE_UNLABELED_NAME,
+	.version = NETLBL_PROTO_VERSION,
+	.maxattr = NLBL_UNLABEL_A_MAX,
+	.policy = netlbl_unlabel_genl_policy,
+	.module = THIS_MODULE,
+	.small_ops = netlbl_unlabel_genl_ops,
+	.n_small_ops = ARRAY_SIZE(netlbl_unlabel_genl_ops),
+};
+
+/*
+ * 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(&netlbl_unlabel_gnl_family);
+}
+
+/*
+ * 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;
+
+#if IS_ENABLED(CONFIG_IPV6)
+	/* When resolving a fallback label, check the sk_buff version as
+	 * it is possible (e.g. SCTP) to have family = PF_INET6 while
+	 * receiving ip_hdr(skb)->version = 4.
+	 */
+	if (family == PF_INET6 && ip_hdr(skb)->version == 4)
+		family = PF_INET;
+#endif /* IPv6 */
+
+	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->family = AF_UNSPEC;
+	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;
+}
diff --git a/net/netlabel/netlabel_unlabeled.h b/net/netlabel/netlabel_unlabeled.h
new file mode 100644
index 000000000..058e3a285
--- /dev/null
+++ b/net/netlabel/netlabel_unlabeled.h
@@ -0,0 +1,231 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * 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
+ */
+
+#ifndef _NETLABEL_UNLABELED_H
+#define _NETLABEL_UNLABELED_H
+
+#include <net/netlabel.h>
+
+/*
+ * The following NetLabel payloads are supported by the Unlabeled subsystem.
+ *
+ * o STATICADD
+ *   This message is sent from an application to add a new static label for
+ *   incoming unlabeled connections.
+ *
+ *   Required attributes:
+ *
+ *     NLBL_UNLABEL_A_IFACE
+ *     NLBL_UNLABEL_A_SECCTX
+ *
+ *   If IPv4 is specified the following attributes are required:
+ *
+ *     NLBL_UNLABEL_A_IPV4ADDR
+ *     NLBL_UNLABEL_A_IPV4MASK
+ *
+ *   If IPv6 is specified the following attributes are required:
+ *
+ *     NLBL_UNLABEL_A_IPV6ADDR
+ *     NLBL_UNLABEL_A_IPV6MASK
+ *
+ * o STATICREMOVE
+ *   This message is sent from an application to remove an existing static
+ *   label for incoming unlabeled connections.
+ *
+ *   Required attributes:
+ *
+ *     NLBL_UNLABEL_A_IFACE
+ *
+ *   If IPv4 is specified the following attributes are required:
+ *
+ *     NLBL_UNLABEL_A_IPV4ADDR
+ *     NLBL_UNLABEL_A_IPV4MASK
+ *
+ *   If IPv6 is specified the following attributes are required:
+ *
+ *     NLBL_UNLABEL_A_IPV6ADDR
+ *     NLBL_UNLABEL_A_IPV6MASK
+ *
+ * o STATICLIST
+ *   This message can be sent either from an application or by the kernel in
+ *   response to an application generated STATICLIST message.  When sent by an
+ *   application there is no payload and the NLM_F_DUMP flag should be set.
+ *   The kernel should response with a series of the following messages.
+ *
+ *   Required attributes:
+ *
+ *     NLBL_UNLABEL_A_IFACE
+ *     NLBL_UNLABEL_A_SECCTX
+ *
+ *   If IPv4 is specified the following attributes are required:
+ *
+ *     NLBL_UNLABEL_A_IPV4ADDR
+ *     NLBL_UNLABEL_A_IPV4MASK
+ *
+ *   If IPv6 is specified the following attributes are required:
+ *
+ *     NLBL_UNLABEL_A_IPV6ADDR
+ *     NLBL_UNLABEL_A_IPV6MASK
+ *
+ * o STATICADDDEF
+ *   This message is sent from an application to set the default static
+ *   label for incoming unlabeled connections.
+ *
+ *   Required attribute:
+ *
+ *     NLBL_UNLABEL_A_SECCTX
+ *
+ *   If IPv4 is specified the following attributes are required:
+ *
+ *     NLBL_UNLABEL_A_IPV4ADDR
+ *     NLBL_UNLABEL_A_IPV4MASK
+ *
+ *   If IPv6 is specified the following attributes are required:
+ *
+ *     NLBL_UNLABEL_A_IPV6ADDR
+ *     NLBL_UNLABEL_A_IPV6MASK
+ *
+ * o STATICREMOVEDEF
+ *   This message is sent from an application to remove the existing default
+ *   static label for incoming unlabeled connections.
+ *
+ *   If IPv4 is specified the following attributes are required:
+ *
+ *     NLBL_UNLABEL_A_IPV4ADDR
+ *     NLBL_UNLABEL_A_IPV4MASK
+ *
+ *   If IPv6 is specified the following attributes are required:
+ *
+ *     NLBL_UNLABEL_A_IPV6ADDR
+ *     NLBL_UNLABEL_A_IPV6MASK
+ *
+ * o STATICLISTDEF
+ *   This message can be sent either from an application or by the kernel in
+ *   response to an application generated STATICLISTDEF message.  When sent by
+ *   an application there is no payload and the NLM_F_DUMP flag should be set.
+ *   The kernel should response with the following message.
+ *
+ *   Required attribute:
+ *
+ *     NLBL_UNLABEL_A_SECCTX
+ *
+ *   If IPv4 is specified the following attributes are required:
+ *
+ *     NLBL_UNLABEL_A_IPV4ADDR
+ *     NLBL_UNLABEL_A_IPV4MASK
+ *
+ *   If IPv6 is specified the following attributes are required:
+ *
+ *     NLBL_UNLABEL_A_IPV6ADDR
+ *     NLBL_UNLABEL_A_IPV6MASK
+ *
+ * o ACCEPT
+ *   This message is sent from an application to specify if the kernel should
+ *   allow unlabled packets to pass if they do not match any of the static
+ *   mappings defined in the unlabeled module.
+ *
+ *   Required attributes:
+ *
+ *     NLBL_UNLABEL_A_ACPTFLG
+ *
+ * o LIST
+ *   This message can be sent either from an application or by the kernel in
+ *   response to an application generated LIST message.  When sent by an
+ *   application there is no payload.  The kernel should respond to a LIST
+ *   message with a LIST message on success.
+ *
+ *   Required attributes:
+ *
+ *     NLBL_UNLABEL_A_ACPTFLG
+ *
+ */
+
+/* NetLabel Unlabeled commands */
+enum {
+	NLBL_UNLABEL_C_UNSPEC,
+	NLBL_UNLABEL_C_ACCEPT,
+	NLBL_UNLABEL_C_LIST,
+	NLBL_UNLABEL_C_STATICADD,
+	NLBL_UNLABEL_C_STATICREMOVE,
+	NLBL_UNLABEL_C_STATICLIST,
+	NLBL_UNLABEL_C_STATICADDDEF,
+	NLBL_UNLABEL_C_STATICREMOVEDEF,
+	NLBL_UNLABEL_C_STATICLISTDEF,
+	__NLBL_UNLABEL_C_MAX,
+};
+
+/* NetLabel Unlabeled attributes */
+enum {
+	NLBL_UNLABEL_A_UNSPEC,
+	NLBL_UNLABEL_A_ACPTFLG,
+	/* (NLA_U8)
+	 * if true then unlabeled packets are allowed to pass, else unlabeled
+	 * packets are rejected */
+	NLBL_UNLABEL_A_IPV6ADDR,
+	/* (NLA_BINARY, struct in6_addr)
+	 * an IPv6 address */
+	NLBL_UNLABEL_A_IPV6MASK,
+	/* (NLA_BINARY, struct in6_addr)
+	 * an IPv6 address mask */
+	NLBL_UNLABEL_A_IPV4ADDR,
+	/* (NLA_BINARY, struct in_addr)
+	 * an IPv4 address */
+	NLBL_UNLABEL_A_IPV4MASK,
+	/* (NLA_BINARY, struct in_addr)
+	 * and IPv4 address mask */
+	NLBL_UNLABEL_A_IFACE,
+	/* (NLA_NULL_STRING)
+	 * network interface */
+	NLBL_UNLABEL_A_SECCTX,
+	/* (NLA_BINARY)
+	 * a LSM specific security context */
+	__NLBL_UNLABEL_A_MAX,
+};
+#define NLBL_UNLABEL_A_MAX (__NLBL_UNLABEL_A_MAX - 1)
+
+/* NetLabel protocol functions */
+int netlbl_unlabel_genl_init(void);
+
+/* Unlabeled connection hash table size */
+/* XXX - currently this number is an uneducated guess */
+#define NETLBL_UNLHSH_BITSIZE       7
+
+/* General Unlabeled init function */
+int netlbl_unlabel_init(u32 size);
+
+/* Static/Fallback label management functions */
+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 netlbl_unlhsh_remove(struct net *net,
+			 const char *dev_name,
+			 const void *addr,
+			 const void *mask,
+			 u32 addr_len,
+			 struct netlbl_audit *audit_info);
+
+/* Process Unlabeled incoming network packets */
+int netlbl_unlabel_getattr(const struct sk_buff *skb,
+			   u16 family,
+			   struct netlbl_lsm_secattr *secattr);
+
+/* Set the default configuration to allow Unlabeled packets */
+int netlbl_unlabel_defconf(void);
+
+#endif
diff --git a/net/netlabel/netlabel_user.c b/net/netlabel/netlabel_user.c
new file mode 100644
index 000000000..3ed4fea2a
--- /dev/null
+++ b/net/netlabel/netlabel_user.c
@@ -0,0 +1,110 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * NetLabel NETLINK Interface
+ *
+ * This file defines the NETLINK interface 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
+ */
+
+#include <linux/init.h>
+#include <linux/types.h>
+#include <linux/list.h>
+#include <linux/socket.h>
+#include <linux/audit.h>
+#include <linux/tty.h>
+#include <linux/security.h>
+#include <linux/gfp.h>
+#include <net/sock.h>
+#include <net/netlink.h>
+#include <net/genetlink.h>
+#include <net/netlabel.h>
+#include <asm/bug.h>
+
+#include "netlabel_mgmt.h"
+#include "netlabel_unlabeled.h"
+#include "netlabel_cipso_v4.h"
+#include "netlabel_calipso.h"
+#include "netlabel_user.h"
+
+/*
+ * NetLabel NETLINK Setup Functions
+ */
+
+/**
+ * netlbl_netlink_init - Initialize the NETLINK communication channel
+ *
+ * Description:
+ * Call out to the NetLabel components so they can register their families and
+ * commands with the Generic NETLINK mechanism.  Returns zero on success and
+ * non-zero on failure.
+ *
+ */
+int __init netlbl_netlink_init(void)
+{
+	int ret_val;
+
+	ret_val = netlbl_mgmt_genl_init();
+	if (ret_val != 0)
+		return ret_val;
+
+	ret_val = netlbl_cipsov4_genl_init();
+	if (ret_val != 0)
+		return ret_val;
+
+	ret_val = netlbl_calipso_genl_init();
+	if (ret_val != 0)
+		return ret_val;
+
+	return netlbl_unlabel_genl_init();
+}
+
+/*
+ * NetLabel Audit Functions
+ */
+
+/**
+ * netlbl_audit_start_common - Start an audit message
+ * @type: audit message type
+ * @audit_info: NetLabel audit information
+ *
+ * Description:
+ * Start an audit message using the type specified in @type and fill the audit
+ * message with some fields common to all NetLabel audit messages.  Returns
+ * a pointer to the audit buffer on success, NULL on failure.
+ *
+ */
+struct audit_buffer *netlbl_audit_start_common(int type,
+					       struct netlbl_audit *audit_info)
+{
+	struct audit_buffer *audit_buf;
+	char *secctx;
+	u32 secctx_len;
+
+	if (audit_enabled == AUDIT_OFF)
+		return NULL;
+
+	audit_buf = audit_log_start(audit_context(), GFP_ATOMIC, type);
+	if (audit_buf == NULL)
+		return NULL;
+
+	audit_log_format(audit_buf, "netlabel: auid=%u ses=%u",
+			 from_kuid(&init_user_ns, audit_info->loginuid),
+			 audit_info->sessionid);
+
+	if (audit_info->secid != 0 &&
+	    security_secid_to_secctx(audit_info->secid,
+				     &secctx,
+				     &secctx_len) == 0) {
+		audit_log_format(audit_buf, " subj=%s", secctx);
+		security_release_secctx(secctx, secctx_len);
+	}
+
+	return audit_buf;
+}
diff --git a/net/netlabel/netlabel_user.h b/net/netlabel/netlabel_user.h
new file mode 100644
index 000000000..32d8f92c9
--- /dev/null
+++ b/net/netlabel/netlabel_user.h
@@ -0,0 +1,49 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * NetLabel NETLINK Interface
+ *
+ * This file defines the NETLINK interface 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
+ */
+
+#ifndef _NETLABEL_USER_H
+#define _NETLABEL_USER_H
+
+#include <linux/types.h>
+#include <linux/skbuff.h>
+#include <linux/capability.h>
+#include <linux/audit.h>
+#include <net/netlink.h>
+#include <net/genetlink.h>
+#include <net/netlabel.h>
+
+/* NetLabel NETLINK helper functions */
+
+/**
+ * netlbl_netlink_auditinfo - Fetch the audit information from a NETLINK msg
+ * @audit_info: NetLabel audit information
+ */
+static inline void netlbl_netlink_auditinfo(struct netlbl_audit *audit_info)
+{
+	security_task_getsecid(current, &audit_info->secid);
+	audit_info->loginuid = audit_get_loginuid(current);
+	audit_info->sessionid = audit_get_sessionid(current);
+}
+
+/* NetLabel NETLINK I/O functions */
+
+int netlbl_netlink_init(void);
+
+/* NetLabel Audit Functions */
+
+struct audit_buffer *netlbl_audit_start_common(int type,
+					      struct netlbl_audit *audit_info);
+
+#endif