netlabel_unlabeled.c 41.6 KB
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/*
 * 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.
 *
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 * Author: Paul Moore <paul@paul-moore.com>
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 *
 */

/*
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 * (c) Copyright Hewlett-Packard Development Company, L.P., 2006 - 2008
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 *
 * This program is free software;  you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY;  without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
 * the GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
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 * along with this program;  if not, see <http://www.gnu.org/licenses/>.
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 *
 */

#include <linux/types.h>
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#include <linux/rcupdate.h>
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#include <linux/list.h>
#include <linux/spinlock.h>
#include <linux/socket.h>
#include <linux/string.h>
#include <linux/skbuff.h>
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#include <linux/audit.h>
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#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>
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#include <linux/slab.h>
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#include <net/sock.h>
#include <net/netlink.h>
#include <net/genetlink.h>
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#include <net/ip.h>
#include <net/ipv6.h>
#include <net/net_namespace.h>
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#include <net/netlabel.h>
#include <asm/bug.h>
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#include <linux/atomic.h>
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#include "netlabel_user.h"
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#include "netlabel_addrlist.h"
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#include "netlabel_domainhash.h"
#include "netlabel_unlabeled.h"
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#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;
};
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#define netlbl_unlhsh_addr4_entry(iter) \
	container_of(iter, struct netlbl_unlhsh_addr4, list)
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struct netlbl_unlhsh_addr4 {
	u32 secid;

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	struct netlbl_af4list list;
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	struct rcu_head rcu;
};
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#define netlbl_unlhsh_addr6_entry(iter) \
	container_of(iter, struct netlbl_unlhsh_addr6, list)
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struct netlbl_unlhsh_addr6 {
	u32 secid;

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	struct netlbl_af6list list;
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	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);
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#define netlbl_unlhsh_rcu_deref(p) \
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	rcu_dereference_check(p, lockdep_is_held(&netlbl_unlhsh_lock))
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static struct netlbl_unlhsh_tbl __rcu *netlbl_unlhsh;
static struct netlbl_unlhsh_iface __rcu *netlbl_unlhsh_def;
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/* Accept unlabeled packets flag */
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static u8 netlabel_unlabel_acceptflg;
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/* NetLabel Generic NETLINK unlabeled family */
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static struct genl_family netlbl_unlabel_gnl_family;
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/* NetLabel Netlink attribute policy */
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static const struct nla_policy netlbl_unlabel_genl_policy[NLBL_UNLABEL_A_MAX + 1] = {
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	[NLBL_UNLABEL_A_ACPTFLG] = { .type = NLA_U8 },
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	[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 }
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};
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/*
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 * 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;
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	struct netlbl_af4list *iter4;
	struct netlbl_af4list *tmp4;
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#if IS_ENABLED(CONFIG_IPV6)
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	struct netlbl_af6list *iter6;
	struct netlbl_af6list *tmp6;
#endif /* IPv6 */
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	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 */

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	netlbl_af4list_foreach_safe(iter4, tmp4, &iface->addr4_list) {
		netlbl_af4list_remove_entry(iter4);
		kfree(netlbl_unlhsh_addr4_entry(iter4));
	}
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#if IS_ENABLED(CONFIG_IPV6)
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	netlbl_af6list_foreach_safe(iter6, tmp6, &iface->addr6_list) {
		netlbl_af6list_remove_entry(iter6);
		kfree(netlbl_unlhsh_addr6_entry(iter6));
	}
#endif /* IPv6 */
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	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
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 * ensuring that the hash table is protected with either a RCU read lock or
 * the hash table lock.
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 *
 */
static u32 netlbl_unlhsh_hash(int ifindex)
{
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	return ifindex & (netlbl_unlhsh_rcu_deref(netlbl_unlhsh)->size - 1);
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}

/**
 * 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
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 * caller is responsible for ensuring that the hash table is protected with
 * either a RCU read lock or the hash table lock.
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 *
 */
static struct netlbl_unlhsh_iface *netlbl_unlhsh_search_iface(int ifindex)
{
	u32 bkt;
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	struct list_head *bkt_list;
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	struct netlbl_unlhsh_iface *iter;

	bkt = netlbl_unlhsh_hash(ifindex);
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	bkt_list = &netlbl_unlhsh_rcu_deref(netlbl_unlhsh)->tbl[bkt];
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	list_for_each_entry_rcu(iter, bkt_list, list)
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		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
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 * a negative value is returned.
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 *
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 */
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static int netlbl_unlhsh_add_addr4(struct netlbl_unlhsh_iface *iface,
				   const struct in_addr *addr,
				   const struct in_addr *mask,
				   u32 secid)
{
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	int ret_val;
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	struct netlbl_unlhsh_addr4 *entry;

	entry = kzalloc(sizeof(*entry), GFP_ATOMIC);
	if (entry == NULL)
		return -ENOMEM;

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	entry->list.addr = addr->s_addr & mask->s_addr;
	entry->list.mask = mask->s_addr;
	entry->list.valid = 1;
	entry->secid = secid;
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	spin_lock(&netlbl_unlhsh_lock);
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	ret_val = netlbl_af4list_add(&entry->list, &iface->addr4_list);
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	spin_unlock(&netlbl_unlhsh_lock);
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	if (ret_val != 0)
		kfree(entry);
	return ret_val;
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}

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#if IS_ENABLED(CONFIG_IPV6)
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/**
 * 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
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 * a negative value is returned.
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 *
 */
static int netlbl_unlhsh_add_addr6(struct netlbl_unlhsh_iface *iface,
				   const struct in6_addr *addr,
				   const struct in6_addr *mask,
				   u32 secid)
{
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	int ret_val;
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	struct netlbl_unlhsh_addr6 *entry;

	entry = kzalloc(sizeof(*entry), GFP_ATOMIC);
	if (entry == NULL)
		return -ENOMEM;

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	entry->list.addr = *addr;
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	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];
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	entry->list.mask = *mask;
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	entry->list.valid = 1;
	entry->secid = secid;
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	spin_lock(&netlbl_unlhsh_lock);
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	ret_val = netlbl_af6list_add(&entry->list, &iface->addr6_list);
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	spin_unlock(&netlbl_unlhsh_lock);
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	if (ret_val != 0)
		kfree(entry);
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	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
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 * is returned.
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 *
 */
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,
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			     &netlbl_unlhsh_rcu_deref(netlbl_unlhsh)->tbl[bkt]);
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	} else {
		INIT_LIST_HEAD(&iface->list);
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		if (netlbl_unlhsh_rcu_deref(netlbl_unlhsh_def) != NULL)
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			goto add_iface_failure;
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		rcu_assign_pointer(netlbl_unlhsh_def, iface);
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	}
	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
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 * @audit_info: NetLabel audit information
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 *
 * Description:
 * Adds a new entry to the unlabeled connection hash table.  Returns zero on
 * success, negative values on failure.
 *
 */
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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)
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{
	int ret_val;
	int ifindex;
	struct net_device *dev;
	struct netlbl_unlhsh_iface *iface;
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	struct audit_buffer *audit_buf = NULL;
	char *secctx = NULL;
	u32 secctx_len;
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	if (addr_len != sizeof(struct in_addr) &&
	    addr_len != sizeof(struct in6_addr))
		return -EINVAL;

	rcu_read_lock();
	if (dev_name != NULL) {
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		dev = dev_get_by_name_rcu(net, dev_name);
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		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;
		}
	}
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	audit_buf = netlbl_audit_start_common(AUDIT_MAC_UNLBL_STCADD,
					      audit_info);
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	switch (addr_len) {
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	case sizeof(struct in_addr): {
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		const struct in_addr *addr4 = addr;
		const struct in_addr *mask4 = mask;
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		ret_val = netlbl_unlhsh_add_addr4(iface, addr4, mask4, secid);
		if (audit_buf != NULL)
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			netlbl_af4list_audit_addr(audit_buf, 1,
						  dev_name,
						  addr4->s_addr,
						  mask4->s_addr);
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		break;
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	}
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#if IS_ENABLED(CONFIG_IPV6)
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	case sizeof(struct in6_addr): {
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		const struct in6_addr *addr6 = addr;
		const struct in6_addr *mask6 = mask;
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		ret_val = netlbl_unlhsh_add_addr6(iface, addr6, mask6, secid);
		if (audit_buf != NULL)
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			netlbl_af6list_audit_addr(audit_buf, 1,
						  dev_name,
						  addr6, mask6);
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		break;
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	}
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#endif /* IPv6 */
	default:
		ret_val = -EINVAL;
	}
	if (ret_val == 0)
		atomic_inc(&netlabel_mgmt_protocount);

unlhsh_add_return:
	rcu_read_unlock();
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	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);
	}
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	return ret_val;
}

/**
 * netlbl_unlhsh_remove_addr4 - Remove an IPv4 address entry
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 * @net: network namespace
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 * @iface: interface entry
 * @addr: IP address
 * @mask: IP address mask
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 * @audit_info: NetLabel audit information
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 *
 * Description:
 * Remove an IP address entry from the unlabeled connection hash table.
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 * Returns zero on success, negative values on failure.
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 *
 */
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static int netlbl_unlhsh_remove_addr4(struct net *net,
				      struct netlbl_unlhsh_iface *iface,
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				      const struct in_addr *addr,
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				      const struct in_addr *mask,
				      struct netlbl_audit *audit_info)
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{
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	struct netlbl_af4list *list_entry;
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	struct netlbl_unlhsh_addr4 *entry;
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	struct audit_buffer *audit_buf;
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	struct net_device *dev;
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	char *secctx;
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	u32 secctx_len;
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	spin_lock(&netlbl_unlhsh_lock);
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	list_entry = netlbl_af4list_remove(addr->s_addr, mask->s_addr,
					   &iface->addr4_list);
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	spin_unlock(&netlbl_unlhsh_lock);
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	if (list_entry != NULL)
		entry = netlbl_unlhsh_addr4_entry(list_entry);
	else
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		entry = NULL;
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	audit_buf = netlbl_audit_start_common(AUDIT_MAC_UNLBL_STCDEL,
					      audit_info);
	if (audit_buf != NULL) {
		dev = dev_get_by_index(net, iface->ifindex);
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		netlbl_af4list_audit_addr(audit_buf, 1,
					  (dev != NULL ? dev->name : NULL),
					  addr->s_addr, mask->s_addr);
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		if (dev != NULL)
			dev_put(dev);
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		if (entry != NULL &&
		    security_secid_to_secctx(entry->secid,
					     &secctx, &secctx_len) == 0) {
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			audit_log_format(audit_buf, " sec_obj=%s", secctx);
			security_release_secctx(secctx, secctx_len);
		}
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		audit_log_format(audit_buf, " res=%u", entry != NULL ? 1 : 0);
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		audit_log_end(audit_buf);
	}

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	if (entry == NULL)
		return -ENOENT;

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	kfree_rcu(entry, rcu);
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	return 0;
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}

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#if IS_ENABLED(CONFIG_IPV6)
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/**
 * netlbl_unlhsh_remove_addr6 - Remove an IPv6 address entry
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 * @net: network namespace
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 * @iface: interface entry
 * @addr: IP address
 * @mask: IP address mask
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 * @audit_info: NetLabel audit information
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 *
 * Description:
 * Remove an IP address entry from the unlabeled connection hash table.
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 * Returns zero on success, negative values on failure.
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 *
 */
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static int netlbl_unlhsh_remove_addr6(struct net *net,
				      struct netlbl_unlhsh_iface *iface,
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				      const struct in6_addr *addr,
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				      const struct in6_addr *mask,
				      struct netlbl_audit *audit_info)
546
{
547
	struct netlbl_af6list *list_entry;
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	struct netlbl_unlhsh_addr6 *entry;
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	struct audit_buffer *audit_buf;
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	struct net_device *dev;
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	char *secctx;
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	u32 secctx_len;
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	spin_lock(&netlbl_unlhsh_lock);
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	list_entry = netlbl_af6list_remove(addr, mask, &iface->addr6_list);
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	spin_unlock(&netlbl_unlhsh_lock);
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	if (list_entry != NULL)
		entry = netlbl_unlhsh_addr6_entry(list_entry);
	else
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		entry = NULL;
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	audit_buf = netlbl_audit_start_common(AUDIT_MAC_UNLBL_STCDEL,
					      audit_info);
	if (audit_buf != NULL) {
		dev = dev_get_by_index(net, iface->ifindex);
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		netlbl_af6list_audit_addr(audit_buf, 1,
					  (dev != NULL ? dev->name : NULL),
					  addr, mask);
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		if (dev != NULL)
			dev_put(dev);
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		if (entry != NULL &&
		    security_secid_to_secctx(entry->secid,
					     &secctx, &secctx_len) == 0) {
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			audit_log_format(audit_buf, " sec_obj=%s", secctx);
			security_release_secctx(secctx, secctx_len);
		}
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		audit_log_format(audit_buf, " res=%u", entry != NULL ? 1 : 0);
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		audit_log_end(audit_buf);
	}

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	if (entry == NULL)
		return -ENOENT;

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	kfree_rcu(entry, rcu);
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	return 0;
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}
#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)
{
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	struct netlbl_af4list *iter4;
602
#if IS_ENABLED(CONFIG_IPV6)
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	struct netlbl_af6list *iter6;
#endif /* IPv6 */
605 606

	spin_lock(&netlbl_unlhsh_lock);
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	netlbl_af4list_foreach_rcu(iter4, &iface->addr4_list)
		goto unlhsh_condremove_failure;
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#if IS_ENABLED(CONFIG_IPV6)
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	netlbl_af6list_foreach_rcu(iter6, &iface->addr6_list)
		goto unlhsh_condremove_failure;
#endif /* IPv6 */
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	iface->valid = 0;
	if (iface->ifindex > 0)
		list_del_rcu(&iface->list);
	else
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		RCU_INIT_POINTER(netlbl_unlhsh_def, NULL);
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	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)
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 * @audit_info: NetLabel audit information
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 *
 * Description:
 * Removes and existing entry from the unlabeled connection hash table.
 * Returns zero on success, negative values on failure.
 *
 */
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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)
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{
	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) {
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		dev = dev_get_by_name_rcu(net, dev_name);
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		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):
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		ret_val = netlbl_unlhsh_remove_addr4(net,
						     iface, addr, mask,
						     audit_info);
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		break;
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#if IS_ENABLED(CONFIG_IPV6)
677
	case sizeof(struct in6_addr):
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		ret_val = netlbl_unlhsh_remove_addr6(net,
						     iface, addr, mask,
						     audit_info);
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		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
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 * @ptr: the netdevice notifier info (cast to void)
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 *
 * 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,
713
					unsigned long event, void *ptr)
714
{
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	struct net_device *dev = netdev_notifier_info_to_dev(ptr);
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	struct netlbl_unlhsh_iface *iface = NULL;

718
	if (!net_eq(dev_net(dev), &init_net))
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		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;
}
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/**
 * netlbl_unlabel_acceptflg_set - Set the unlabeled accept flag
 * @value: desired value
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 * @audit_info: NetLabel audit information
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 *
 * Description:
 * Set the value of the unlabeled accept flag to @value.
 *
 */
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static void netlbl_unlabel_acceptflg_set(u8 value,
					 struct netlbl_audit *audit_info)
750
{
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	struct audit_buffer *audit_buf;
	u8 old_val;

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	old_val = netlabel_unlabel_acceptflg;
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	netlabel_unlabel_acceptflg = value;
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	audit_buf = netlbl_audit_start_common(AUDIT_MAC_UNLBL_ALLOW,
					      audit_info);
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	if (audit_buf != NULL) {
		audit_log_format(audit_buf,
				 " unlbl_accept=%u old=%u", value, old_val);
		audit_log_end(audit_buf);
	}
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}

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/**
 * netlbl_unlabel_addrinfo_get - Get the IPv4/6 address information
 * @info: the Generic NETLINK info block
 * @addr: the IP address
 * @mask: the IP address mask
 * @len: the address length
 *
 * Description:
 * Examine the Generic NETLINK message and extract the IP address information.
 * Returns zero on success, negative values on failure.
 *
 */
static int netlbl_unlabel_addrinfo_get(struct genl_info *info,
				       void **addr,
				       void **mask,
				       u32 *len)
{
	u32 addr_len;

	if (info->attrs[NLBL_UNLABEL_A_IPV4ADDR]) {
		addr_len = nla_len(info->attrs[NLBL_UNLABEL_A_IPV4ADDR]);
		if (addr_len != sizeof(struct in_addr) &&
		    addr_len != nla_len(info->attrs[NLBL_UNLABEL_A_IPV4MASK]))
			return -EINVAL;
		*len = addr_len;
		*addr = nla_data(info->attrs[NLBL_UNLABEL_A_IPV4ADDR]);
		*mask = nla_data(info->attrs[NLBL_UNLABEL_A_IPV4MASK]);
		return 0;
	} else if (info->attrs[NLBL_UNLABEL_A_IPV6ADDR]) {
		addr_len = nla_len(info->attrs[NLBL_UNLABEL_A_IPV6ADDR]);
		if (addr_len != sizeof(struct in6_addr) &&
		    addr_len != nla_len(info->attrs[NLBL_UNLABEL_A_IPV6MASK]))
			return -EINVAL;
		*len = addr_len;
		*addr = nla_data(info->attrs[NLBL_UNLABEL_A_IPV6ADDR]);
		*mask = nla_data(info->attrs[NLBL_UNLABEL_A_IPV6MASK]);
		return 0;
	}

	return -EINVAL;
}

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/*
 * 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)
{
823
	u8 value;
824
	struct netlbl_audit audit_info;
825

826 827
	if (info->attrs[NLBL_UNLABEL_A_ACPTFLG]) {
		value = nla_get_u8(info->attrs[NLBL_UNLABEL_A_ACPTFLG]);
828
		if (value == 1 || value == 0) {
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			netlbl_netlink_auditinfo(skb, &audit_info);
			netlbl_unlabel_acceptflg_set(value, &audit_info);
831
			return 0;
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		}
	}

835
	return -EINVAL;
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}

/**
 * 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)
{
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	int ret_val = -EINVAL;
851
	struct sk_buff *ans_skb;
852
	void *data;
853

854
	ans_skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
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	if (ans_skb == NULL)
		goto list_failure;
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	data = genlmsg_put_reply(ans_skb, info, &netlbl_unlabel_gnl_family,
				 0, NLBL_UNLABEL_C_LIST);
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	if (data == NULL) {
		ret_val = -ENOMEM;
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		goto list_failure;
862
	}
863

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	ret_val = nla_put_u8(ans_skb,
			     NLBL_UNLABEL_A_ACPTFLG,
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			     netlabel_unlabel_acceptflg);
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	if (ret_val != 0)
		goto list_failure;

870
	genlmsg_end(ans_skb, data);
871
	return genlmsg_reply(ans_skb, info);
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list_failure:
Patrick McHardy's avatar
Patrick McHardy committed
874
	kfree_skb(ans_skb);
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	return ret_val;
}

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/**
 * 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;
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	struct netlbl_audit audit_info;
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	/* 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;

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	netlbl_netlink_auditinfo(skb, &audit_info);

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	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,
926 927
				 dev_name, addr, mask, addr_len, secid,
				 &audit_info);
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}

/**
 * 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;
949
	struct netlbl_audit audit_info;
950 951 952 953 954 955 956 957 958 959 960 961

	/* 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;

962 963
	netlbl_netlink_auditinfo(skb, &audit_info);

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	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;

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	return netlbl_unlhsh_add(&init_net,
				 NULL, addr, mask, addr_len, secid,
				 &audit_info);
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}

/**
 * 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;
998
	struct netlbl_audit audit_info;
999 1000 1001 1002 1003 1004 1005 1006 1007 1008

	/* 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;

1009 1010
	netlbl_netlink_auditinfo(skb, &audit_info);

1011 1012 1013 1014 1015
	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]);

1016 1017 1018
	return netlbl_unlhsh_remove(&init_net,
				    dev_name, addr, mask, addr_len,
				    &audit_info);
1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038
}

/**
 * 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;
1039
	struct netlbl_audit audit_info;
1040 1041 1042 1043 1044 1045 1046 1047 1048

	/* 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;

1049 1050
	netlbl_netlink_auditinfo(skb, &audit_info);

1051 1052 1053 1054
	ret_val = netlbl_unlabel_addrinfo_get(info, &addr, &mask, &addr_len);
	if (ret_val != 0)
		return ret_val;

1055 1056 1057
	return netlbl_unlhsh_remove(&init_net,
				    NULL, addr, mask, addr_len,
				    &audit_info);
1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090
}


/**
 * 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;

1091
	data = genlmsg_put(cb_arg->skb, NETLINK_CB(cb_arg->nl_cb->skb).portid,
1092 1093 1094 1095 1096 1097 1098
			   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);
1099 1100 1101 1102
		if (!dev) {
			ret_val = -ENODEV;
			goto list_cb_failure;
		}
1103 1104 1105 1106 1107 1108 1109 1110 1111 1112
		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;

1113
		addr_struct.s_addr = addr4->list.addr;
1114 1115 1116
		ret_val = nla_put_in_addr(cb_arg->skb,
					  NLBL_UNLABEL_A_IPV4ADDR,
					  addr_struct.s_addr);
1117 1118 1119
		if (ret_val != 0)
			goto list_cb_failure;

1120
		addr_struct.s_addr = addr4->list.mask;
1121 1122 1123
		ret_val = nla_put_in_addr(cb_arg->skb,
					  NLBL_UNLABEL_A_IPV4MASK,
					  addr_struct.s_addr);
1124 1125 1126 1127 1128
		if (ret_val != 0)
			goto list_cb_failure;

		secid = addr4->secid;
	} else {
1129 1130 1131
		ret_val = nla_put_in6_addr(cb_arg->skb,
					   NLBL_UNLABEL_A_IPV6ADDR,
					   &addr6->list.addr);
1132 1133 1134
		if (ret_val != 0)
			goto list_cb_failure;

1135 1136 1137
		ret_val = nla_put_in6_addr(cb_arg->skb,
					   NLBL_UNLABEL_A_IPV6MASK,
					   &addr6->list.mask);
1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155
		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++;
1156 1157
	genlmsg_end(cb_arg->skb, data);
	return 0;
1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183

list_cb_failure:
	genlmsg_cancel(cb_arg->skb, data);
	return ret_val;
}

/**
 * netlbl_unlabel_staticlist - Handle a STATICLIST message
 * @skb: the NETLINK buffer
 * @cb: the NETLINK callback
 *
 * Description:
 * Process a user generated STATICLIST message and dump the unlabeled
 * connection hash table in a form suitable for use in a kernel generated
 * STATICLIST message.  Returns the length of @skb.
 *
 */
static int netlbl_unlabel_staticlist(struct sk_buff *skb,
				     struct netlink_callback *cb)
{
	struct netlbl_unlhsh_walk_arg cb_arg;
	u32 skip_bkt = cb->args[0];
	u32 skip_chain = cb->args[1];
	u32 iter_bkt;
	u32 iter_chain = 0, iter_addr4 = 0, iter_addr6 = 0;
	struct netlbl_unlhsh_iface *iface;
1184
	struct list_head *iter_list;
1185
	struct netlbl_af4list *addr4;
1186
#if IS_ENABLED(CONFIG_IPV6)
1187 1188
	struct netlbl_af6list *addr6;
#endif
1189 1190 1191 1192 1193 1194 1195 1196 1197

	cb_arg.nl_cb = cb;
	cb_arg.skb = skb;
	cb_arg.seq = cb->nlh->nlmsg_seq;

	rcu_read_lock();
	for (iter_bkt = skip_bkt;
	     iter_bkt < rcu_dereference(netlbl_unlhsh)->size;
	     iter_bkt++, iter_chain = 0, iter_addr4 = 0, iter_addr6 = 0) {
1198 1199
		iter_list = &rcu_dereference(netlbl_unlhsh)->tbl[iter_bkt];
		list_for_each_entry_rcu(iface, iter_list, list) {
1200 1201 1202
			if (!iface->valid ||
			    iter_chain++ < skip_chain)
				continue;
1203 1204
			netlbl_af4list_foreach_rcu(addr4,
						   &iface->addr4_list) {
1205
				if (iter_addr4++ < cb->args[2])
1206 1207
					continue;
				if (netlbl_unlabel_staticlist_gen(
1208 1209 1210 1211 1212
					      NLBL_UNLABEL_C_STATICLIST,
					      iface,
					      netlbl_unlhsh_addr4_entry(addr4),
					      NULL,
					      &cb_arg) < 0) {
1213 1214 1215 1216 1217
					iter_addr4--;
					iter_chain--;
					goto unlabel_staticlist_return;
				}
			}
1218
#if IS_ENABLED(CONFIG_IPV6)
1219 1220
			netlbl_af6list_foreach_rcu(addr6,
						   &iface->addr6_list) {
1221
				if (iter_addr6++ < cb->args[3])
1222 1223
					continue;
				if (netlbl_unlabel_staticlist_gen(
1224 1225 1226 1227 1228
					      NLBL_UNLABEL_C_STATICLIST,
					      iface,
					      NULL,
					      netlbl_unlhsh_addr6_entry(addr6),
					      &cb_arg) < 0) {
1229 1230 1231 1232 1233
					iter_addr6--;
					iter_chain--;
					goto unlabel_staticlist_return;
				}
			}
1234
#endif /* IPv6 */
1235 1236 1237 1238 1239
		}
	}

unlabel_staticlist_return:
	rcu_read_unlock();
1240 1241 1242 1243
	cb->args[0] = iter_bkt;
	cb->args[1] = iter_chain;
	cb->args[2] = iter_addr4;
	cb->args[3] = iter_addr6;
1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262
	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;
1263
	u32 iter_addr4 = 0, iter_addr6 = 0;
1264
	struct netlbl_af4list *addr4;
1265
#if IS_ENABLED(CONFIG_IPV6)
1266 1267
	struct netlbl_af6list *addr6;
#endif
1268 1269 1270 1271 1272 1273 1274 1275 1276 1277

	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;

1278
	netlbl_af4list_foreach_rcu(addr4, &iface->addr4_list) {
1279
		if (iter_addr4++ < cb->args[0])
1280 1281
			continue;
		if (netlbl_unlabel_staticlist_gen(NLBL_UNLABEL_C_STATICLISTDEF,
1282 1283 1284 1285
					      iface,
					      netlbl_unlhsh_addr4_entry(addr4),
					      NULL,
					      &cb_arg) < 0) {
1286 1287 1288 1289
			iter_addr4--;
			goto unlabel_staticlistdef_return;
		}
	}
1290
#if IS_ENABLED(CONFIG_IPV6)
1291
	netlbl_af6list_foreach_rcu(addr6, &iface->addr6_list) {
1292
		if (iter_addr6++ < cb->args[1])
1293 1294
			continue;
		if (netlbl_unlabel_staticlist_gen(NLBL_UNLABEL_C_STATICLISTDEF,
1295 1296 1297 1298
					      iface,
					      NULL,
					      netlbl_unlhsh_addr6_entry(addr6),
					      &cb_arg) < 0) {
1299 1300 1301 1302
			iter_addr6--;
			goto unlabel_staticlistdef_return;
		}
	}
1303
#endif /* IPv6 */
1304 1305 1306

unlabel_staticlistdef_return:
	rcu_read_unlock();
1307 1308
	cb->args[0] = iter_addr4;
	cb->args[1] = iter_addr6;
1309 1310
	return skb->len;
}
1311 1312 1313 1314 1315

/*
 * NetLabel Generic NETLINK Command Definitions
 */

1316
static const struct genl_ops netlbl_unlabel_genl_ops[] = {
1317
	{
1318 1319 1320 1321 1322
	.cmd = NLBL_UNLABEL_C_STATICADD,
	.flags = GENL_ADMIN_PERM,
	.policy = netlbl_unlabel_genl_policy,
	.doit = netlbl_unlabel_staticadd,
	.dumpit = NULL,
1323 1324
	},
	{
1325 1326 1327 1328 1329
	.cmd = NLBL_UNLABEL_C_STATICREMOVE,
	.flags = GENL_ADMIN_PERM,
	.policy = netlbl_unlabel_genl_policy,
	.doit = netlbl_unlabel_staticremove,
	.dumpit = NULL,
1330 1331
	},
	{
1332 1333 1334 1335 1336
	.cmd = NLBL_UNLABEL_C_STATICLIST,
	.flags = 0,
	.policy = netlbl_unlabel_genl_policy,
	.doit = NULL,
	.dumpit = netlbl_unlabel_staticlist,
1337 1338
	},
	{
1339 1340 1341 1342 1343
	.cmd = NLBL_UNLABEL_C_STATICADDDEF,
	.flags = GENL_ADMIN_PERM,
	.policy = netlbl_unlabel_genl_policy,
	.doit = netlbl_unlabel_staticadddef,
	.dumpit = NULL,
1344 1345
	},
	{
1346 1347 1348 1349 1350
	.cmd = NLBL_UNLABEL_C_STATICREMOVEDEF,
	.flags = GENL_ADMIN_PERM,
	.policy = netlbl_unlabel_genl_policy,
	.doit = netlbl_unlabel_staticremovedef,
	.dumpit = NULL,
1351 1352
	},
	{
1353 1354 1355 1356 1357
	.cmd = NLBL_UNLABEL_C_STATICLISTDEF,
	.flags = 0,
	.policy = netlbl_unlabel_genl_policy,
	.doit = NULL,
	.dumpit = netlbl_unlabel_staticlistdef,
1358 1359
	},
	{
1360
	.cmd = NLBL_UNLABEL_C_ACCEPT,
1361 1362
	.flags = GENL_ADMIN_PERM,
	.policy = netlbl_unlabel_genl_policy,
1363 1364
	.doit = netlbl_unlabel_accept,
	.dumpit = NULL,
1365 1366
	},
	{
1367 1368
	.cmd = NLBL_UNLABEL_C_LIST,
	.flags = 0,
1369
	.policy = netlbl_unlabel_genl_policy,
1370 1371
	.doit = netlbl_unlabel_list,
	.dumpit = NULL,
1372
	},
1373 1374
};

1375 1376 1377 1378 1379 1380 1381 1382 1383 1384
static struct genl_family netlbl_unlabel_gnl_family = {
	.hdrsize = 0,
	.name = NETLBL_NLTYPE_UNLABELED_NAME,
	.version = NETLBL_PROTO_VERSION,
	.maxattr = NLBL_UNLABEL_A_MAX,
	.module = THIS_MODULE,
	.ops = netlbl_unlabel_genl_ops,
	.n_ops = ARRAY_SIZE(netlbl_unlabel_genl_ops),
};

1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396
/*
 * 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.
 *
 */
1397
int __init netlbl_unlabel_genl_init(void)
1398
{
1399
	return genl_register_family(&netlbl_unlabel_gnl_family);
1400 1401 1402 1403 1404 1405
}

/*
 * NetLabel KAPI Hooks
 */

1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420
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.
 *
 */
1421
int __init netlbl_unlabel_init(u32 size)
1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443
{
	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);
1444
	rcu_assign_pointer(netlbl_unlhsh, hsh_tbl);
1445 1446 1447 1448 1449 1450 1451
	spin_unlock(&netlbl_unlhsh_lock);

	register_netdevice_notifier(&netlbl_unlhsh_netdev_notifier);

	return 0;
}

1452 1453
/**
 * netlbl_unlabel_getattr - Get the security attributes for an unlabled packet
1454 1455
 * @skb: the packet
 * @family: protocol family
1456 1457 1458 1459 1460 1461 1462
 * @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.
 *
 */
1463 1464 1465
int netlbl_unlabel_getattr(const struct sk_buff *skb,
			   u16 family,
			   struct netlbl_lsm_secattr *secattr)
1466
{
1467 1468 1469
	struct netlbl_unlhsh_iface *iface;

	rcu_read_lock();
1470
	iface = netlbl_unlhsh_search_iface(skb->skb_iif);
1471
	if (iface == NULL)
1472 1473
		iface = rcu_dereference(netlbl_unlhsh_def);
	if (iface == NULL || !iface->valid)
1474 1475
		goto unlabel_getattr_nolabel;
	switch (family) {
1476 1477
	case PF_INET: {
		struct iphdr *hdr4;
1478
		struct netlbl_af4list *addr4;
1479

1480
		hdr4 = ip_hdr(skb);
1481 1482
		addr4 = netlbl_af4list_search(hdr4->saddr,
					      &iface->addr4_list);
1483 1484
		if (addr4 == NULL)
			goto unlabel_getattr_nolabel;
1485
		secattr->attr.secid = netlbl_unlhsh_addr4_entry(addr4)->secid;
1486
		break;
1487
	}
1488
#if IS_ENABLED(CONFIG_IPV6)
1489 1490
	case PF_INET6: {
		struct ipv6hdr *hdr6;
1491
		struct netlbl_af6list *addr6;
1492

1493
		hdr6 = ipv6_hdr(skb);
1494 1495
		addr6 = netlbl_af6list_search(&hdr6->saddr,
					      &iface->addr6_list);
1496 1497
		if (addr6 == NULL)
			goto unlabel_getattr_nolabel;
1498
		secattr->attr.secid = netlbl_unlhsh_addr6_entry(addr6)->secid;
1499
		break;
1500
	}
1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512
#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();
1513 1514
	if (netlabel_unlabel_acceptflg == 0)
		return -ENOMSG;
1515
	secattr->type = NETLBL_NLTYPE_UNLABELED;
1516
	return 0;
1517 1518 1519 1520 1521 1522 1523 1524 1525 1526
}

/**
 * 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.
 *
 */
1527
int __init netlbl_unlabel_defconf(void)
1528 1529 1530
{
	int ret_val;
	struct netlbl_dom_map *entry;
1531
	struct netlbl_audit audit_info;
1532

1533 1534 1535 1536
	/* 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);
1537
	audit_info.loginuid = GLOBAL_ROOT_UID;
1538
	audit_info.sessionid = 0;
1539 1540 1541 1542

	entry = kzalloc(sizeof(*entry), GFP_KERNEL);
	if (entry == NULL)
		return -ENOMEM;
1543
	entry->family = AF_UNSPEC;
1544
	entry->def.type = NETLBL_NLTYPE_UNLABELED;
1545
	ret_val = netlbl_domhsh_add_default(entry, &audit_info);
1546 1547 1548
	if (ret_val != 0)
		return ret_val;

1549
	netlbl_unlabel_acceptflg_set(1, &audit_info);
1550 1551 1552

	return 0;
}