cregit-Linux how code gets into the kernel

Release 4.11 net/ipv4/cipso_ipv4.c

Directory: net/ipv4
/*
 * CIPSO - Commercial IP Security Option
 *
 * This is an implementation of the CIPSO 2.2 protocol as specified in
 * draft-ietf-cipso-ipsecurity-01.txt with additional tag types as found in
 * FIPS-188.  While CIPSO never became a full IETF RFC standard many vendors
 * have chosen to adopt the protocol and over the years it has become a
 * de-facto standard for labeled networking.
 *
 * The CIPSO draft specification can be found in the kernel's Documentation
 * directory as well as the following URL:
 *   http://tools.ietf.org/id/draft-ietf-cipso-ipsecurity-01.txt
 * The FIPS-188 specification can be found at the following URL:
 *   http://www.itl.nist.gov/fipspubs/fip188.htm
 *
 * Author: Paul Moore <paul.moore@hp.com>
 *
 */

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

#include <linux/init.h>
#include <linux/types.h>
#include <linux/rcupdate.h>
#include <linux/list.h>
#include <linux/spinlock.h>
#include <linux/string.h>
#include <linux/jhash.h>
#include <linux/audit.h>
#include <linux/slab.h>
#include <net/ip.h>
#include <net/icmp.h>
#include <net/tcp.h>
#include <net/netlabel.h>
#include <net/cipso_ipv4.h>
#include <linux/atomic.h>
#include <linux/bug.h>
#include <asm/unaligned.h>

/* List of available DOI definitions */
/* XXX - This currently assumes a minimal number of different DOIs in use,
 * if in practice there are a lot of different DOIs this list should
 * probably be turned into a hash table or something similar so we
 * can do quick lookups. */
static DEFINE_SPINLOCK(cipso_v4_doi_list_lock);
static LIST_HEAD(cipso_v4_doi_list);

/* Label mapping cache */

int cipso_v4_cache_enabled = 1;

int cipso_v4_cache_bucketsize = 10;

#define CIPSO_V4_CACHE_BUCKETBITS     7

#define CIPSO_V4_CACHE_BUCKETS        (1 << CIPSO_V4_CACHE_BUCKETBITS)

#define CIPSO_V4_CACHE_REORDERLIMIT   10

struct cipso_v4_map_cache_bkt {
	
spinlock_t lock;
	
u32 size;
	
struct list_head list;
};


struct cipso_v4_map_cache_entry {
	
u32 hash;
	
unsigned char *key;
	
size_t key_len;

	
struct netlbl_lsm_cache *lsm_data;

	
u32 activity;
	
struct list_head list;
};


static struct cipso_v4_map_cache_bkt *cipso_v4_cache;

/* Restricted bitmap (tag #1) flags */

int cipso_v4_rbm_optfmt = 0;

int cipso_v4_rbm_strictvalid = 1;

/*
 * Protocol Constants
 */

/* Maximum size of the CIPSO IP option, derived from the fact that the maximum
 * IPv4 header size is 60 bytes and the base IPv4 header is 20 bytes long. */

#define CIPSO_V4_OPT_LEN_MAX          40

/* Length of the base CIPSO option, this includes the option type (1 byte), the
 * option length (1 byte), and the DOI (4 bytes). */

#define CIPSO_V4_HDR_LEN              6

/* Base length of the restrictive category bitmap tag (tag #1). */

#define CIPSO_V4_TAG_RBM_BLEN         4

/* Base length of the enumerated category tag (tag #2). */

#define CIPSO_V4_TAG_ENUM_BLEN        4

/* Base length of the ranged categories bitmap tag (tag #5). */

#define CIPSO_V4_TAG_RNG_BLEN         4
/* The maximum number of category ranges permitted in the ranged category tag
 * (tag #5).  You may note that the IETF draft states that the maximum number
 * of category ranges is 7, but if the low end of the last category range is
 * zero then it is possible to fit 8 category ranges because the zero should
 * be omitted. */

#define CIPSO_V4_TAG_RNG_CAT_MAX      8

/* Base length of the local tag (non-standard tag).
 *  Tag definition (may change between kernel versions)
 *
 * 0          8          16         24         32
 * +----------+----------+----------+----------+
 * | 10000000 | 00000110 | 32-bit secid value  |
 * +----------+----------+----------+----------+
 * | in (host byte order)|
 * +----------+----------+
 *
 */

#define CIPSO_V4_TAG_LOC_BLEN         6

/*
 * Helper Functions
 */

/**
 * cipso_v4_cache_entry_free - Frees a cache entry
 * @entry: the entry to free
 *
 * Description:
 * This function frees the memory associated with a cache entry including the
 * LSM cache data if there are no longer any users, i.e. reference count == 0.
 *
 */



static void cipso_v4_cache_entry_free(struct cipso_v4_map_cache_entry *entry)
{
	if (entry->lsm_data)
		netlbl_secattr_cache_free(entry->lsm_data);
	kfree(entry->key);
	kfree(entry);
}


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/**
 * cipso_v4_map_cache_hash - Hashing function for the CIPSO cache
 * @key: the hash key
 * @key_len: the length of the key in bytes
 *
 * Description:
 * The CIPSO tag hashing function.  Returns a 32-bit hash value.
 *
 */



static u32 cipso_v4_map_cache_hash(const unsigned char *key, u32 key_len)
{
	return jhash(key, key_len, 0);
}


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/*
 * Label Mapping Cache Functions
 */

/**
 * cipso_v4_cache_init - Initialize the CIPSO cache
 *
 * Description:
 * Initializes the CIPSO label mapping cache, this function should be called
 * before any of the other functions defined in this file.  Returns zero on
 * success, negative values on error.
 *
 */



static int __init cipso_v4_cache_init(void)
{
	u32 iter;

	cipso_v4_cache = kcalloc(CIPSO_V4_CACHE_BUCKETS,
				 sizeof(struct cipso_v4_map_cache_bkt),
				 GFP_KERNEL);
	if (!cipso_v4_cache)
		return -ENOMEM;

	for (iter = 0; iter < CIPSO_V4_CACHE_BUCKETS; iter++) {
		spin_lock_init(&cipso_v4_cache[iter].lock);
		cipso_v4_cache[iter].size = 0;
		INIT_LIST_HEAD(&cipso_v4_cache[iter].list);
	}

	return 0;
}


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/**
 * cipso_v4_cache_invalidate - Invalidates the current CIPSO cache
 *
 * Description:
 * Invalidates and frees any entries in the CIPSO cache.  Returns zero on
 * success and negative values on failure.
 *
 */



void cipso_v4_cache_invalidate(void)
{
	struct cipso_v4_map_cache_entry *entry, *tmp_entry;
	u32 iter;

	for (iter = 0; iter < CIPSO_V4_CACHE_BUCKETS; iter++) {
		spin_lock_bh(&cipso_v4_cache[iter].lock);
		list_for_each_entry_safe(entry,
					 tmp_entry,
					 &cipso_v4_cache[iter].list, list) {
			list_del(&entry->list);
			cipso_v4_cache_entry_free(entry);
		}
		cipso_v4_cache[iter].size = 0;
		spin_unlock_bh(&cipso_v4_cache[iter].lock);
	}
}


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/**
 * cipso_v4_cache_check - Check the CIPSO cache for a label mapping
 * @key: the buffer to check
 * @key_len: buffer length in bytes
 * @secattr: the security attribute struct to use
 *
 * Description:
 * This function checks the cache to see if a label mapping already exists for
 * the given key.  If there is a match then the cache is adjusted and the
 * @secattr struct is populated with the correct LSM security attributes.  The
 * cache is adjusted in the following manner if the entry is not already the
 * first in the cache bucket:
 *
 *  1. The cache entry's activity counter is incremented
 *  2. The previous (higher ranking) entry's activity counter is decremented
 *  3. If the difference between the two activity counters is geater than
 *     CIPSO_V4_CACHE_REORDERLIMIT the two entries are swapped
 *
 * Returns zero on success, -ENOENT for a cache miss, and other negative values
 * on error.
 *
 */



static int cipso_v4_cache_check(const unsigned char *key,
				u32 key_len,
				struct netlbl_lsm_secattr *secattr)
{
	u32 bkt;
	struct cipso_v4_map_cache_entry *entry;
	struct cipso_v4_map_cache_entry *prev_entry = NULL;
	u32 hash;

	if (!cipso_v4_cache_enabled)
		return -ENOENT;

	hash = cipso_v4_map_cache_hash(key, key_len);
	bkt = hash & (CIPSO_V4_CACHE_BUCKETS - 1);
	spin_lock_bh(&cipso_v4_cache[bkt].lock);
	list_for_each_entry(entry, &cipso_v4_cache[bkt].list, list) {
		if (entry->hash == hash &&
		    entry->key_len == key_len &&
		    memcmp(entry->key, key, key_len) == 0) {
			entry->activity += 1;
			atomic_inc(&entry->lsm_data->refcount);
			secattr->cache = entry->lsm_data;
			secattr->flags |= NETLBL_SECATTR_CACHE;
			secattr->type = NETLBL_NLTYPE_CIPSOV4;
			if (!prev_entry) {
				spin_unlock_bh(&cipso_v4_cache[bkt].lock);
				return 0;
			}

			if (prev_entry->activity > 0)
				prev_entry->activity -= 1;
			if (entry->activity > prev_entry->activity &&
			    entry->activity - prev_entry->activity >
			    CIPSO_V4_CACHE_REORDERLIMIT) {
				__list_del(entry->list.prev, entry->list.next);
				__list_add(&entry->list,
					   prev_entry->list.prev,
					   &prev_entry->list);
			}

			spin_unlock_bh(&cipso_v4_cache[bkt].lock);
			return 0;
		}
		prev_entry = entry;
	}
	spin_unlock_bh(&cipso_v4_cache[bkt].lock);

	return -ENOENT;
}


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/**
 * cipso_v4_cache_add - Add an entry to the CIPSO cache
 * @skb: the packet
 * @secattr: the packet's security attributes
 *
 * Description:
 * Add a new entry into the CIPSO label mapping cache.  Add the new entry to
 * head of the cache bucket's list, if the cache bucket is out of room remove
 * the last entry in the list first.  It is important to note that there is
 * currently no checking for duplicate keys.  Returns zero on success,
 * negative values on failure.
 *
 */



int cipso_v4_cache_add(const unsigned char *cipso_ptr,
		       const struct netlbl_lsm_secattr *secattr)
{
	int ret_val = -EPERM;
	u32 bkt;
	struct cipso_v4_map_cache_entry *entry = NULL;
	struct cipso_v4_map_cache_entry *old_entry = NULL;
	u32 cipso_ptr_len;

	if (!cipso_v4_cache_enabled || cipso_v4_cache_bucketsize <= 0)
		return 0;

	cipso_ptr_len = cipso_ptr[1];

	entry = kzalloc(sizeof(*entry), GFP_ATOMIC);
	if (!entry)
		return -ENOMEM;
	entry->key = kmemdup(cipso_ptr, cipso_ptr_len, GFP_ATOMIC);
	if (!entry->key) {
		ret_val = -ENOMEM;
		goto cache_add_failure;
	}
	entry->key_len = cipso_ptr_len;
	entry->hash = cipso_v4_map_cache_hash(cipso_ptr, cipso_ptr_len);
	atomic_inc(&secattr->cache->refcount);
	entry->lsm_data = secattr->cache;

	bkt = entry->hash & (CIPSO_V4_CACHE_BUCKETS - 1);
	spin_lock_bh(&cipso_v4_cache[bkt].lock);
	if (cipso_v4_cache[bkt].size < cipso_v4_cache_bucketsize) {
		list_add(&entry->list, &cipso_v4_cache[bkt].list);
		cipso_v4_cache[bkt].size += 1;
	} else {
		old_entry = list_entry(cipso_v4_cache[bkt].list.prev,
				       struct cipso_v4_map_cache_entry, list);
		list_del(&old_entry->list);
		list_add(&entry->list, &cipso_v4_cache[bkt].list);
		cipso_v4_cache_entry_free(old_entry);
	}
	spin_unlock_bh(&cipso_v4_cache[bkt].lock);

	return 0;

cache_add_failure:
	if (entry)
		cipso_v4_cache_entry_free(entry);
	return ret_val;
}


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Ian Morris20.69%114.29%


Pavel Emelyanov10.35%114.29%


Total289100.00%7100.00%



/*
 * DOI List Functions
 */

/**
 * cipso_v4_doi_search - Searches for a DOI definition
 * @doi: the DOI to search for
 *
 * Description:
 * Search the DOI definition list for a DOI definition with a DOI value that
 * matches @doi.  The caller is responsible for calling rcu_read_[un]lock().
 * Returns a pointer to the DOI definition on success and NULL on failure.
 */



static struct cipso_v4_doi *cipso_v4_doi_search(u32 doi)
{
	struct cipso_v4_doi *iter;

	list_for_each_entry_rcu(iter, &cipso_v4_doi_list, list)
		if (iter->doi == doi && atomic_read(&iter->refcount))
			return iter;
	return NULL;
}


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/**
 * cipso_v4_doi_add - Add a new DOI to the CIPSO protocol engine
 * @doi_def: the DOI structure
 * @audit_info: NetLabel audit information
 *
 * Description:
 * The caller defines a new DOI for use by the CIPSO 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 cipso_ipv4.h for details).  Returns
 * zero on success and non-zero on failure.
 *
 */



int cipso_v4_doi_add(struct cipso_v4_doi *doi_def,
		     struct netlbl_audit *audit_info)
{
	int ret_val = -EINVAL;
	u32 iter;
	u32 doi;
	u32 doi_type;
	struct audit_buffer *audit_buf;

	doi = doi_def->doi;
	doi_type = doi_def->type;

	if (doi_def->doi == CIPSO_V4_DOI_UNKNOWN)
		goto doi_add_return;
	for (iter = 0; iter < CIPSO_V4_TAG_MAXCNT; iter++) {
		switch (doi_def->tags[iter]) {
		case CIPSO_V4_TAG_RBITMAP:
			break;
		case CIPSO_V4_TAG_RANGE:
		case CIPSO_V4_TAG_ENUM:
			if (doi_def->type != CIPSO_V4_MAP_PASS)
				goto doi_add_return;
			break;
		case CIPSO_V4_TAG_LOCAL:
			if (doi_def->type != CIPSO_V4_MAP_LOCAL)
				goto doi_add_return;
			break;
		case CIPSO_V4_TAG_INVALID:
			if (iter == 0)
				goto doi_add_return;
			break;
		default:
			goto doi_add_return;
		}
	}

	atomic_set(&doi_def->refcount, 1);

	spin_lock(&cipso_v4_doi_list_lock);
	if (cipso_v4_doi_search(doi_def->doi)) {
		spin_unlock(&cipso_v4_doi_list_lock);
		ret_val = -EEXIST;
		goto doi_add_return;
	}
	list_add_tail_rcu(&doi_def->list, &cipso_v4_doi_list);
	spin_unlock(&cipso_v4_doi_list_lock);
	ret_val = 0;

doi_add_return:
	audit_buf = netlbl_audit_start(AUDIT_MAC_CIPSOV4_ADD, audit_info);
	if (audit_buf) {
		const char *type_str;
		switch (doi_type) {
		case CIPSO_V4_MAP_TRANS:
			type_str = "trans";
			break;
		case CIPSO_V4_MAP_PASS:
			type_str = "pass";
			break;
		case CIPSO_V4_MAP_LOCAL:
			type_str = "local";
			break;
		default:
			type_str = "(unknown)";
		}
		audit_log_format(audit_buf,
				 " cipso_doi=%u cipso_type=%s res=%u",
				 doi, type_str, ret_val == 0 ? 1 : 0);
		audit_log_end(audit_buf);
	}

	return ret_val;
}


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/**
 * cipso_v4_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 cipso_v4_doi_free(struct cipso_v4_doi *doi_def)
{
	if (!doi_def)
		return;

	switch (doi_def->type) {
	case CIPSO_V4_MAP_TRANS:
		kfree(doi_def->map.std->lvl.cipso);
		kfree(doi_def->map.std->lvl.local);
		kfree(doi_def->map.std->cat.cipso);
		kfree(doi_def->map.std->cat.local);
		break;
	}
	kfree(doi_def);
}


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/**
 * cipso_v4_doi_free_rcu - Frees a DOI definition via the RCU pointer
 * @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 the DOI definition can be released
 * safely.
 *
 */



static void cipso_v4_doi_free_rcu(struct rcu_head *entry)
{
	struct cipso_v4_doi *doi_def;

	doi_def = container_of(entry, struct cipso_v4_doi, rcu);
	cipso_v4_doi_free(doi_def);
}


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/**
 * cipso_v4_doi_remove - Remove an existing DOI from the CIPSO protocol engine
 * @doi: the DOI value
 * @audit_secid: the LSM secid to use in the audit message
 *
 * Description:
 * Removes a DOI definition from the CIPSO 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 cipso_v4_doi_remove(u32 doi, struct netlbl_audit *audit_info)
{
	int ret_val;
	struct cipso_v4_doi *doi_def;
	struct audit_buffer *audit_buf;

	spin_lock(&cipso_v4_doi_list_lock);
	doi_def = cipso_v4_doi_search(doi);
	if (!doi_def) {
		spin_unlock(&cipso_v4_doi_list_lock);
		ret_val = -ENOENT;
		goto doi_remove_return;
	}
	if (!atomic_dec_and_test(&doi_def->refcount)) {
		spin_unlock(&cipso_v4_doi_list_lock);
		ret_val = -EBUSY;
		goto doi_remove_return;
	}
	list_del_rcu(&doi_def->list);
	spin_unlock(&cipso_v4_doi_list_lock);

	cipso_v4_cache_invalidate();
	call_rcu(&doi_def->rcu, cipso_v4_doi_free_rcu);
	ret_val = 0;

doi_remove_return:
	audit_buf = netlbl_audit_start(AUDIT_MAC_CIPSOV4_DEL, audit_info);
	if (audit_buf) {
		audit_log_format(audit_buf,
				 " cipso_doi=%u res=%u",
				 doi, ret_val == 0 ? 1 : 0);
		audit_log_end(audit_buf);
	}

	return ret_val;
}


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/**
 * cipso_v4_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
 * rcu_read_lock() is held while accessing the returned definition and the DOI
 * definition reference count is decremented when the caller is done.
 *
 */



struct cipso_v4_doi *cipso_v4_doi_getdef(u32 doi)
{
	struct cipso_v4_doi *doi_def;

	rcu_read_lock();
	doi_def = cipso_v4_doi_search(doi);
	if (!doi_def)
		goto doi_getdef_return;
	if (!atomic_inc_not_zero(&doi_def->refcount))
		doi_def = NULL;

doi_getdef_return:
	rcu_read_unlock();
	return doi_def;
}


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/**
 * cipso_v4_doi_putdef - Releases a reference for the given DOI definition
 * @doi_def: the DOI definition
 *
 * Description:
 * Releases a DOI definition reference obtained from cipso_v4_doi_getdef().
 *
 */



void cipso_v4_doi_putdef(struct cipso_v4_doi *doi_def)
{
	if (!doi_def)
		return;

	if (!atomic_dec_and_test(&doi_def->refcount))
		return;
	spin_lock(&cipso_v4_doi_list_lock);
	list_del_rcu(&doi_def->list);
	spin_unlock(&cipso_v4_doi_list_lock);

	cipso_v4_cache_invalidate();
	call_rcu(&doi_def->rcu, cipso_v4_doi_free_rcu);
}


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/**
 * cipso_v4_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 cipso_v4_doi_walk(u32 *skip_cnt,
		     int (*callback) (struct cipso_v4_doi *doi_def, void *arg),
		     void *cb_arg)
{
	int ret_val = -ENOENT;
	u32 doi_cnt = 0;
	struct cipso_v4_doi *iter_doi;

	rcu_read_lock();
	list_for_each_entry_rcu(iter_doi, &cipso_v4_doi_list, list)
		if (atomic_read(&iter_doi->refcount) > 0) {
			if (doi_cnt++ < *skip_cnt)
				continue;
			ret_val = callback(iter_doi, cb_arg);
			if (ret_val < 0) {
				doi_cnt--;
				goto doi_walk_return;
			}
		}

doi_walk_return:
	rcu_read_unlock();
	*skip_cnt = doi_cnt;
	return ret_val;
}


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/*
 * Label Mapping Functions
 */

/**
 * cipso_v4_map_lvl_valid - Checks to see if the given level is understood
 * @doi_def: the DOI definition
 * @level: the level to check
 *
 * Description:
 * Checks the given level against the given DOI definition and returns a
 * negative value if the level does not have a valid mapping and a zero value
 * if the level is defined by the DOI.
 *
 */



static int cipso_v4_map_lvl_valid(const struct cipso_v4_doi *doi_def, u8 level)
{
	switch (doi_def->type) {
	case CIPSO_V4_MAP_PASS:
		return 0;
	case CIPSO_V4_MAP_TRANS:
		if (doi_def->map.std->lvl.cipso[level] < CIPSO_V4_INV_LVL)
			return 0;
		break;
	}

	return -EFAULT;
}


Contributors
PersonTokensPropCommitsCommitProp
Paul Moore57100.00%2100.00%


Total57100.00%2100.00%



/**
 * cipso_v4_map_lvl_hton - Perform a level mapping from the host to the network
 * @doi_def: the DOI definition
 * @host_lvl: the host MLS level
 * @net_lvl: the network/CIPSO MLS level
 *
 * Description:
 * Perform a label mapping to translate a local MLS level to the correct
 * CIPSO level using the given DOI definition.  Returns zero on success,
 * negative values otherwise.
 *
 */



static int cipso_v4_map_lvl_hton(const struct cipso_v4_doi *doi_def,
				 u32 host_lvl,
				 u32 *net_lvl)
{
	switch (doi_def->type) {
	case CIPSO_V4_MAP_PASS:
		*net_lvl = host_lvl;
		return 0;
	case CIPSO_V4_MAP_TRANS:
		if (host_lvl < doi_def->map.std->lvl.local_size &&
		    doi_def->map.std->lvl.local[host_lvl] < CIPSO_V4_INV_LVL) {
			*net_lvl = doi_def->map.std->lvl.local[host_lvl];
			return 0;
		}
		return -EPERM;
	}

	return -EINVAL;
}


Contributors
PersonTokensPropCommitsCommitProp
Paul Moore99100.00%3100.00%


Total99100.00%3100.00%



/**
 * cipso_v4_map_lvl_ntoh - Perform a level mapping from the network to the host
 * @doi_def: the DOI definition
 * @net_lvl: the network/CIPSO MLS level
 * @host_lvl: the host MLS level
 *
 * Description:
 * Perform a label mapping to translate a CIPSO level to the correct local MLS
 * level using the given DOI definition.  Returns zero on success, negative
 * values otherwise.
 *
 */



static int cipso_v4_map_lvl_ntoh(const struct cipso_v4_doi *doi_def,
				 u32 net_lvl,
				 u32 *host_lvl)
{
	struct cipso_v4_std_map_tbl *map_tbl;

	switch (doi_def->type) {
	case CIPSO_V4_MAP_PASS:
		*host_lvl = net_lvl;
		return 0;
	case CIPSO_V4_MAP_TRANS:
		map_tbl = doi_def->map.std;
		if (net_lvl < map_tbl->lvl.cipso_size &&
		    map_tbl->lvl.cipso[net_lvl] < CIPSO_V4_INV_LVL) {
			*host_lvl = doi_def->map.std->lvl.cipso[net_lvl];
			return 0;
		}
		return -EPERM;
	}

	return -EINVAL;
}


Contributors
PersonTokensPropCommitsCommitProp
Paul Moore104100.00%3100.00%


Total104100.00%3100.00%



/**
 * cipso_v4_map_cat_rbm_valid - Checks to see if the category bitmap is valid
 * @doi_def: the DOI definition
 * @bitmap: category bitmap
 * @bitmap_len: bitmap length in bytes
 *
 * Description:
 * Checks the given category bitmap against the given DOI definition and
 * returns a negative value if any of the categories in the bitmap do not have
 * a valid mapping and a zero value if all of the categories are valid.
 *
 */



static int cipso_v4_map_cat_rbm_valid(const struct cipso_v4_doi *doi_def,
				      const unsigned char *bitmap,
				      u32 bitmap_len)
{
	int cat = -1;
	u32 bitmap_len_bits = bitmap_len * 8;
	u32 cipso_cat_size;
	u32 *cipso_array;

	switch (doi_def->type) {
	case CIPSO_V4_MAP_PASS:
		return 0;
	case CIPSO_V4_MAP_TRANS:
		cipso_cat_size = doi_def->map.std->cat.cipso_size;
		cipso_array = doi_def->map.std->cat.cipso;
		for (;;) {
			cat = netlbl_bitmap_walk(bitmap,
						 bitmap_len_bits,
						 cat + 1,
						 1);
			if (cat < 0)
				break;
			if (cat >= cipso_cat_size ||
			    cipso_array[cat] >= CIPSO_V4_INV_CAT)
				return -EFAULT;
		}

		if (cat == -1)
			return 0;
		break;
	}

	return -EFAULT;
}


Contributors
PersonTokensPropCommitsCommitProp
Paul Moore14299.30%375.00%


Huw Davies10.70%125.00%


Total143100.00%4100.00%



/**
 * cipso_v4_map_cat_rbm_hton - Perform a category mapping from host to network
 * @doi_def: the DOI definition
 * @secattr: the security attributes
 * @net_cat: the zero'd out category bitmap in network/CIPSO format
 * @net_cat_len: the length of the CIPSO bitmap in bytes
 *
 * Description:
 * Perform a label mapping to translate a local MLS category bitmap to the
 * correct CIPSO bitmap using the given DOI definition.  Returns the minimum
 * size in bytes of the network bitmap on success, negative values otherwise.
 *
 */



static int cipso_v4_map_cat_rbm_hton(const struct cipso_v4_doi *doi_def,
				     const struct netlbl_lsm_secattr *secattr,
				     unsigned char *net_cat,
				     u32 net_cat_len)
{
	int host_spot = -1;
	u32 net_spot = CIPSO_V4_INV_CAT;
	u32 net_spot_max = 0;
	u32 net_clen_bits = net_cat_len * 8;
	u32 host_cat_size = 0;
	u32 *host_cat_array = NULL;

	if (doi_def->type == CIPSO_V4_MAP_TRANS) {
		host_cat_size = doi_def->map.std->cat.local_size;
		host_cat_array = doi_def->map.std->cat.local;
	}

	for (;;) {
		host_spot = netlbl_catmap_walk(secattr->attr.mls.cat,
					       host_spot + 1);
		if (host_spot < 0)
			break;

		switch (doi_def->type) {
		case CIPSO_V4_MAP_PASS:
			net_spot = host_spot;
			break;
		case CIPSO_V4_MAP_TRANS:
			if (host_spot >= host_cat_size)
				return -EPERM;
			net_spot = host_cat_array[host_spot];
			if (net_spot >= CIPSO_V4_INV_CAT)
				return -EPERM;
			break;
		}
		if (net_spot >= net_clen_bits)
			return -ENOSPC;
		netlbl_bitmap_setbit(net_cat, net_spot, 1);

		if (net_spot > net_spot_max)
			net_spot_max = net_spot;
	}

	if (++net_spot_max % 8)
		return net_spot_max / 8 + 1;
	return net_spot_max / 8;
}


Contributors
PersonTokensPropCommitsCommitProp
Paul Moore21999.55%787.50%


Huw Davies10.45%112.50%


Total220100.00%8100.00%



/**
 * cipso_v4_map_cat_rbm_ntoh - Perform a category mapping from network to host
 * @doi_def: the DOI definition
 * @net_cat: the category bitmap in network/CIPSO format
 * @net_cat_len: the length of the CIPSO bitmap in bytes
 * @secattr: the security attributes
 *
 * Description:
 * Perform a label mapping to translate a CIPSO bitmap to the correct local
 * MLS category bitmap using the given DOI definition.  Returns zero on
 * success, negative values on failure.
 *
 */



static int cipso_v4_map_cat_rbm_ntoh(const struct cipso_v4_doi *doi_def,
				     const unsigned char *net_cat,
				     u32 net_cat_len,
				     struct netlbl_lsm_secattr *secattr)
{
	int ret_val;
	int net_spot = -1;
	u32 host_spot = CIPSO_V4_INV_CAT;
	u32 net_clen_bits = net_cat_len * 8;
	u32 net_cat_size = 0;
	u32 *net_cat_array = NULL;

	if (doi_def->type == CIPSO_V4_MAP_TRANS) {
		net_cat_size = doi_def->map.std->cat.cipso_size;
		net_cat_array = doi_def->map.std->cat.cipso;
	}

	for (;;) {
		net_spot = netlbl_bitmap_walk(net_cat,
					      net_clen_bits,
					      net_spot + 1,
					      1);
		if (net_spot < 0) {
			if (net_spot == -2)
				return -EFAULT;
			return 0;
		}

		switch (doi_def->type) {
		case CIPSO_V4_MAP_PASS:
			host_spot = net_spot;
			break;
		case CIPSO_V4_MAP_TRANS:
			if (net_spot >= net_cat_size)
				return -EPERM;
			host_spot = net_cat_array[net_spot];
			if (host_spot >= CIPSO_V4_INV_CAT)
				return -EPERM;
			break;
		}
		ret_val = netlbl_catmap_setbit(&secattr->attr.mls.cat,
						       host_spot,
						       GFP_ATOMIC);
		if (ret_val != 0)
			return ret_val;
	}

	return -EINVAL;
}


Contributors
PersonTokensPropCommitsCommitProp
Paul Moore21399.53%888.89%


Huw Davies10.47%111.11%


Total214100.00%9100.00%



/**
 * cipso_v4_map_cat_enum_valid - Checks to see if the categories are valid
 * @doi_def: the DOI definition
 * @enumcat: category list
 * @enumcat_len: length of the category list in bytes
 *
 * Description:
 * Checks the given categories against the given DOI definition and returns a
 * negative value if any of the categories do not have a valid mapping and a
 * zero value if all of the categories are valid.
 *
 */



static int cipso_v4_map_cat_enum_valid(const struct cipso_v4_doi *doi_def,
				       const unsigned char *enumcat,
				       u32 enumcat_len)
{
	u16 cat;
	int cat_prev = -1;
	u32 iter;

	if (doi_def->type != CIPSO_V4_MAP_PASS || enumcat_len & 0x01)
		return -EFAULT;

	for (iter = 0; iter < enumcat_len; iter += 2) {
		cat = get_unaligned_be16(&enumcat[iter]);
		if (cat <= cat_prev)
			return -EFAULT;
		cat_prev = cat;
	}

	return 0;
}


Contributors
PersonTokensPropCommitsCommitProp
Paul Moore9298.92%480.00%


Harvey Harrison11.08%120.00%


Total93100.00%5100.00%



/**
 * cipso_v4_map_cat_enum_hton - Perform a category mapping from host to network
 * @doi_def: the DOI definition
 * @secattr: the security attributes
 * @net_cat: the zero'd out category list in network/CIPSO format
 * @net_cat_len: the length of the CIPSO category list in bytes
 *
 * Description:
 * Perform a label mapping to translate a local MLS category bitmap to the
 * correct CIPSO category list using the given DOI definition.   Returns the
 * size in bytes of the network category bitmap on success, negative values
 * otherwise.
 *
 */



static int cipso_v4_map_cat_enum_hton(const struct cipso_v4_doi *doi_def,
				      const struct netlbl_lsm_secattr *secattr,
				      unsigned char *net_cat,
				      u32 net_cat_len)
{
	int cat = -1;
	u32 cat_iter = 0;

	for (;;) {
		cat = netlbl_catmap_walk(secattr->attr.mls.cat, cat + 1);
		if (cat < 0)
			break;
		if ((cat_iter + 2) > net_cat_len)
			return -ENOSPC;

		*((__be16 *)&net_cat[cat_iter]) = htons(cat);
		cat_iter += 2;
	}

	return cat_iter;
}


Contributors
PersonTokensPropCommitsCommitProp
Paul Moore107100.00%6100.00%


Total107100.00%6100.00%



/**
 * cipso_v4_map_cat_enum_ntoh - Perform a category mapping from network to host
 * @doi_def: the DOI definition
 * @net_cat: the category list in network/CIPSO format
 * @net_cat_len: the length of the CIPSO bitmap in bytes
 * @secattr: the security attributes
 *
 * Description:
 * Perform a label mapping to translate a CIPSO category list to the correct
 * local MLS category bitmap using the given DOI definition.  Returns zero on
 * success, negative values on failure.
 *
 */



static int cipso_v4_map_cat_enum_ntoh(const struct cipso_v4_doi *doi_def,
				      const unsigned char *net_cat,
				      u32 net_cat_len,
				      struct netlbl_lsm_secattr *secattr)
{
	int ret_val;
	u32 iter;

	for (iter = 0; iter < net_cat_len; iter += 2) {
		ret_val = netlbl_catmap_setbit(&secattr->attr.mls.cat,
					     get_unaligned_be16(&net_cat[iter]),
					     GFP_ATOMIC);
		if (ret_val != 0)
			return ret_val;
	}

	return 0;
}


Contributors
PersonTokensPropCommitsCommitProp
Paul Moore8498.82%583.33%


Harvey Harrison11.18%116.67%


Total85100.00%6100.00%



/**
 * cipso_v4_map_cat_rng_valid - Checks to see if the categories are valid
 * @doi_def: the DOI definition
 * @rngcat: category list
 * @rngcat_len: length of the category list in bytes
 *
 * Description:
 * Checks the given categories against the given DOI definition and returns a
 * negative value if any of the categories do not have a valid mapping and a
 * zero value if all of the categories are valid.
 *
 */



static int cipso_v4_map_cat_rng_valid(const struct cipso_v4_doi *doi_def,
				      const unsigned char *rngcat,
				      u32 rngcat_len)
{
	u16 cat_high;
	u16 cat_low;
	u32 cat_prev = CIPSO_V4_MAX_REM_CATS + 1;
	u32 iter;

	if (doi_def->type != CIPSO_V4_MAP_PASS || rngcat_len & 0x01)
		return -EFAULT;

	for (iter = 0; iter < rngcat_len; iter += 4) {
		cat_high = get_unaligned_be16(&rngcat[iter]);
		if ((iter + 4) <= rngcat_len)
			cat_low = get_unaligned_be16