[GitHub/mt8127/android_kernel_alcatel_ttab.git] / net / sctp / ssnmap.c

/* SCTP kernel implementation
 * Copyright (c) 2003 International Business Machines, Corp.
 *
 * This file is part of the SCTP kernel implementation
 *
 * These functions manipulate sctp SSN tracker.
 *
 * This SCTP implementation 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, or (at your option)
 * any later version.
 *
 * This SCTP implementation 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 GNU CC; see the file COPYING.  If not, write to
 * the Free Software Foundation, 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 *
 * Please send any bug reports or fixes you make to the
 * email address(es):
 *    lksctp developers <lksctp-developers@lists.sourceforge.net>
 *
 * Or submit a bug report through the following website:
 *    http://www.sf.net/projects/lksctp
 *
 * Written or modified by:
 *    Jon Grimm             <jgrimm@us.ibm.com>
 *
 * Any bugs reported given to us we will try to fix... any fixes shared will
 * be incorporated into the next SCTP release.
 */

#include <linux/types.h>
#include <linux/slab.h>
#include <net/sctp/sctp.h>
#include <net/sctp/sm.h>

static struct sctp_ssnmap *sctp_ssnmap_init(struct sctp_ssnmap *map, __u16 in,
					    __u16 out);

/* Storage size needed for map includes 2 headers and then the
 * specific needs of in or out streams.
 */
static inline size_t sctp_ssnmap_size(__u16 in, __u16 out)
{
	return sizeof(struct sctp_ssnmap) + (in + out) * sizeof(__u16);
}


/* Create a new sctp_ssnmap.
 * Allocate room to store at least 'len' contiguous TSNs.
 */
struct sctp_ssnmap *sctp_ssnmap_new(__u16 in, __u16 out,
				    gfp_t gfp)
{
	struct sctp_ssnmap *retval;
	int size;

	size = sctp_ssnmap_size(in, out);
	if (size <= KMALLOC_MAX_SIZE)
		retval = kmalloc(size, gfp);
	else
		retval = (struct sctp_ssnmap *)
			  __get_free_pages(gfp, get_order(size));
	if (!retval)
		goto fail;

	if (!sctp_ssnmap_init(retval, in, out))
		goto fail_map;

	SCTP_DBG_OBJCNT_INC(ssnmap);

	return retval;

fail_map:
	if (size <= KMALLOC_MAX_SIZE)
		kfree(retval);
	else
		free_pages((unsigned long)retval, get_order(size));
fail:
	return NULL;
}


/* Initialize a block of memory as a ssnmap.  */
static struct sctp_ssnmap *sctp_ssnmap_init(struct sctp_ssnmap *map, __u16 in,
					    __u16 out)
{
	memset(map, 0x00, sctp_ssnmap_size(in, out));

	/* Start 'in' stream just after the map header. */
	map->in.ssn = (__u16 *)&map[1];
	map->in.len = in;

	/* Start 'out' stream just after 'in'. */
	map->out.ssn = &map->in.ssn[in];
	map->out.len = out;

	return map;
}

/* Clear out the ssnmap streams.  */
void sctp_ssnmap_clear(struct sctp_ssnmap *map)
{
	size_t size;

	size = (map->in.len + map->out.len) * sizeof(__u16);
	memset(map->in.ssn, 0x00, size);
}

/* Dispose of a ssnmap.  */
void sctp_ssnmap_free(struct sctp_ssnmap *map)
{
	int size;

	if (unlikely(!map))
		return;

	size = sctp_ssnmap_size(map->in.len, map->out.len);
	if (size <= KMALLOC_MAX_SIZE)
		kfree(map);
	else
		free_pages((unsigned long)map, get_order(size));

	SCTP_DBG_OBJCNT_DEC(ssnmap);
}
Commit	Line	Data
60c778b2	1	/* SCTP kernel implementation
1da177e4 LT	2	* Copyright (c) 2003 International Business Machines, Corp.
1da177e4 LT	3	*
60c778b2	4	* This file is part of the SCTP kernel implementation
1da177e4 LT	5	*
	6	* These functions manipulate sctp SSN tracker.
	7	*
60c778b2	8	* This SCTP implementation is free software;
1da177e4 LT	9	* you can redistribute it and/or modify it under the terms of
	10	* the GNU General Public License as published by
	11	* the Free Software Foundation; either version 2, or (at your option)
	12	* any later version.
	13	*
60c778b2	14	* This SCTP implementation is distributed in the hope that it
1da177e4 LT	15	* will be useful, but WITHOUT ANY WARRANTY; without even the implied
	16	* ************************
	17	* warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
	18	* See the GNU General Public License for more details.
	19	*
	20	* You should have received a copy of the GNU General Public License
	21	* along with GNU CC; see the file COPYING. If not, write to
	22	* the Free Software Foundation, 59 Temple Place - Suite 330,
	23	* Boston, MA 02111-1307, USA.
	24	*
	25	* Please send any bug reports or fixes you make to the
	26	* email address(es):
	27	* lksctp developers <lksctp-developers@lists.sourceforge.net>
	28	*
	29	* Or submit a bug report through the following website:
	30	* http://www.sf.net/projects/lksctp
	31	*
	32	* Written or modified by:
	33	* Jon Grimm <jgrimm@us.ibm.com>
	34	*
	35	* Any bugs reported given to us we will try to fix... any fixes shared will
	36	* be incorporated into the next SCTP release.
	37	*/
	38
	39	#include <linux/types.h>
5a0e3ad6	40	#include <linux/slab.h>
1da177e4 LT	41	#include <net/sctp/sctp.h>
	42	#include <net/sctp/sm.h>
	43
1da177e4 LT	44	static struct sctp_ssnmap sctp_ssnmap_init(struct sctp_ssnmap map, __u16 in,
	45	__u16 out);
	46
	47	/* Storage size needed for map includes 2 headers and then the
	48	* specific needs of in or out streams.
	49	*/
	50	static inline size_t sctp_ssnmap_size(__u16 in, __u16 out)
	51	{
	52	return sizeof(struct sctp_ssnmap) + (in + out) * sizeof(__u16);
	53	}
	54
	55
	56	/* Create a new sctp_ssnmap.
	57	* Allocate room to store at least 'len' contiguous TSNs.
	58	*/
3182cd84	59	struct sctp_ssnmap *sctp_ssnmap_new(__u16 in, __u16 out,
dd0fc66f	60	gfp_t gfp)
1da177e4 LT	61	{
	62	struct sctp_ssnmap *retval;
	63	int size;
	64
	65	size = sctp_ssnmap_size(in, out);
3f736868	66	if (size <= KMALLOC_MAX_SIZE)
1da177e4 LT	67	retval = kmalloc(size, gfp);
	68	else
	69	retval = (struct sctp_ssnmap *)
	70	__get_free_pages(gfp, get_order(size));
	71	if (!retval)
	72	goto fail;
	73
	74	if (!sctp_ssnmap_init(retval, in, out))
	75	goto fail_map;
	76
1da177e4 LT	77	SCTP_DBG_OBJCNT_INC(ssnmap);
	78
	79	return retval;
	80
	81	fail_map:
3f736868	82	if (size <= KMALLOC_MAX_SIZE)
1da177e4 LT	83	kfree(retval);
	84	else
	85	free_pages((unsigned long)retval, get_order(size));
	86	fail:
	87	return NULL;
	88	}
	89
	90
	91	/* Initialize a block of memory as a ssnmap. */
	92	static struct sctp_ssnmap sctp_ssnmap_init(struct sctp_ssnmap map, __u16 in,
	93	__u16 out)
	94	{
	95	memset(map, 0x00, sctp_ssnmap_size(in, out));
	96
	97	/* Start 'in' stream just after the map header. */
	98	map->in.ssn = (__u16 *)&map[1];
	99	map->in.len = in;
	100
	101	/* Start 'out' stream just after 'in'. */
	102	map->out.ssn = &map->in.ssn[in];
	103	map->out.len = out;
	104
	105	return map;
	106	}
	107
	108	/* Clear out the ssnmap streams. */
	109	void sctp_ssnmap_clear(struct sctp_ssnmap *map)
	110	{
	111	size_t size;
	112
	113	size = (map->in.len + map->out.len) * sizeof(__u16);
	114	memset(map->in.ssn, 0x00, size);
	115	}
	116
	117	/* Dispose of a ssnmap. */
	118	void sctp_ssnmap_free(struct sctp_ssnmap *map)
	119	{
542c2d83 DB	120	int size;
	121
	122	if (unlikely(!map))
	123	return;
	124
	125	size = sctp_ssnmap_size(map->in.len, map->out.len);
	126	if (size <= KMALLOC_MAX_SIZE)
	127	kfree(map);
	128	else
	129	free_pages((unsigned long)map, get_order(size));
	130
	131	SCTP_DBG_OBJCNT_DEC(ssnmap);
1da177e4	132	}