[mirror_ubuntu-artful-kernel.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 <linux-sctp@vger.kernel.org>
 *
 * Written or modified by:
 *    Jon Grimm             <jgrimm@us.ibm.com>
 */

#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):
91705c61	27	* lksctp developers <linux-sctp@vger.kernel.org>
1da177e4	28	*
1da177e4 LT	29	* Written or modified by:
1da177e4 LT	30	* Jon Grimm <jgrimm@us.ibm.com>
1da177e4 LT	31	*/
	32
	33	#include <linux/types.h>
5a0e3ad6	34	#include <linux/slab.h>
1da177e4 LT	35	#include <net/sctp/sctp.h>
	36	#include <net/sctp/sm.h>
	37
1da177e4 LT	38	static struct sctp_ssnmap sctp_ssnmap_init(struct sctp_ssnmap map, __u16 in,
	39	__u16 out);
	40
	41	/* Storage size needed for map includes 2 headers and then the
	42	* specific needs of in or out streams.
	43	*/
	44	static inline size_t sctp_ssnmap_size(__u16 in, __u16 out)
	45	{
	46	return sizeof(struct sctp_ssnmap) + (in + out) * sizeof(__u16);
	47	}
	48
	49
	50	/* Create a new sctp_ssnmap.
	51	* Allocate room to store at least 'len' contiguous TSNs.
	52	*/
3182cd84	53	struct sctp_ssnmap *sctp_ssnmap_new(__u16 in, __u16 out,
dd0fc66f	54	gfp_t gfp)
1da177e4 LT	55	{
	56	struct sctp_ssnmap *retval;
	57	int size;
	58
	59	size = sctp_ssnmap_size(in, out);
3f736868	60	if (size <= KMALLOC_MAX_SIZE)
1da177e4 LT	61	retval = kmalloc(size, gfp);
	62	else
	63	retval = (struct sctp_ssnmap *)
	64	__get_free_pages(gfp, get_order(size));
	65	if (!retval)
	66	goto fail;
	67
	68	if (!sctp_ssnmap_init(retval, in, out))
	69	goto fail_map;
	70
1da177e4 LT	71	SCTP_DBG_OBJCNT_INC(ssnmap);
	72
	73	return retval;
	74
	75	fail_map:
3f736868	76	if (size <= KMALLOC_MAX_SIZE)
1da177e4 LT	77	kfree(retval);
	78	else
	79	free_pages((unsigned long)retval, get_order(size));
	80	fail:
	81	return NULL;
	82	}
	83
	84
	85	/* Initialize a block of memory as a ssnmap. */
	86	static struct sctp_ssnmap sctp_ssnmap_init(struct sctp_ssnmap map, __u16 in,
	87	__u16 out)
	88	{
	89	memset(map, 0x00, sctp_ssnmap_size(in, out));
	90
	91	/* Start 'in' stream just after the map header. */
	92	map->in.ssn = (__u16 *)&map[1];
	93	map->in.len = in;
	94
	95	/* Start 'out' stream just after 'in'. */
	96	map->out.ssn = &map->in.ssn[in];
	97	map->out.len = out;
	98
	99	return map;
	100	}
	101
	102	/* Clear out the ssnmap streams. */
	103	void sctp_ssnmap_clear(struct sctp_ssnmap *map)
	104	{
	105	size_t size;
	106
	107	size = (map->in.len + map->out.len) * sizeof(__u16);
	108	memset(map->in.ssn, 0x00, size);
	109	}
	110
	111	/* Dispose of a ssnmap. */
	112	void sctp_ssnmap_free(struct sctp_ssnmap *map)
	113	{
542c2d83 DB	114	int size;
	115
	116	if (unlikely(!map))
	117	return;
	118
	119	size = sctp_ssnmap_size(map->in.len, map->out.len);
	120	if (size <= KMALLOC_MAX_SIZE)
	121	kfree(map);
	122	else
	123	free_pages((unsigned long)map, get_order(size));
	124
	125	SCTP_DBG_OBJCNT_DEC(ssnmap);
1da177e4	126	}