[linux-2.6-block.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 <net/sctp/sctp.h>
#include <net/sctp/sm.h>

#define MAX_KMALLOC_SIZE	131072

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 <= MAX_KMALLOC_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;

	retval->malloced = 1;
	SCTP_DBG_OBJCNT_INC(ssnmap);

	return retval;

fail_map:
	if (size <= MAX_KMALLOC_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)
{
	if (map && map->malloced) {
		int size;

		size = sctp_ssnmap_size(map->in.len, map->out.len);
		if (size <= MAX_KMALLOC_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>
	40	#include <net/sctp/sctp.h>
	41	#include <net/sctp/sm.h>
	42
	43	#define MAX_KMALLOC_SIZE 131072
	44
	45	static struct sctp_ssnmap sctp_ssnmap_init(struct sctp_ssnmap map, __u16 in,
	46	__u16 out);
	47
	48	/* Storage size needed for map includes 2 headers and then the
	49	* specific needs of in or out streams.
	50	*/
	51	static inline size_t sctp_ssnmap_size(__u16 in, __u16 out)
	52	{
	53	return sizeof(struct sctp_ssnmap) + (in + out) * sizeof(__u16);
	54	}
	55
	56
	57	/* Create a new sctp_ssnmap.
	58	* Allocate room to store at least 'len' contiguous TSNs.
	59	*/
3182cd84	60	struct sctp_ssnmap *sctp_ssnmap_new(__u16 in, __u16 out,
dd0fc66f	61	gfp_t gfp)
1da177e4 LT	62	{
	63	struct sctp_ssnmap *retval;
	64	int size;
	65
	66	size = sctp_ssnmap_size(in, out);
	67	if (size <= MAX_KMALLOC_SIZE)
	68	retval = kmalloc(size, gfp);
	69	else
	70	retval = (struct sctp_ssnmap *)
	71	__get_free_pages(gfp, get_order(size));
	72	if (!retval)
	73	goto fail;
	74
	75	if (!sctp_ssnmap_init(retval, in, out))
	76	goto fail_map;
	77
	78	retval->malloced = 1;
	79	SCTP_DBG_OBJCNT_INC(ssnmap);
	80
	81	return retval;
	82
	83	fail_map:
	84	if (size <= MAX_KMALLOC_SIZE)
	85	kfree(retval);
	86	else
	87	free_pages((unsigned long)retval, get_order(size));
	88	fail:
	89	return NULL;
	90	}
	91
	92
	93	/* Initialize a block of memory as a ssnmap. */
	94	static struct sctp_ssnmap sctp_ssnmap_init(struct sctp_ssnmap map, __u16 in,
	95	__u16 out)
	96	{
	97	memset(map, 0x00, sctp_ssnmap_size(in, out));
	98
	99	/* Start 'in' stream just after the map header. */
	100	map->in.ssn = (__u16 *)&map[1];
	101	map->in.len = in;
	102
	103	/* Start 'out' stream just after 'in'. */
	104	map->out.ssn = &map->in.ssn[in];
	105	map->out.len = out;
	106
	107	return map;
	108	}
	109
	110	/* Clear out the ssnmap streams. */
	111	void sctp_ssnmap_clear(struct sctp_ssnmap *map)
	112	{
	113	size_t size;
	114
	115	size = (map->in.len + map->out.len) * sizeof(__u16);
	116	memset(map->in.ssn, 0x00, size);
	117	}
	118
	119	/* Dispose of a ssnmap. */
	120	void sctp_ssnmap_free(struct sctp_ssnmap *map)
	121	{
	122	if (map && map->malloced) {
	123	int size;
	124
	125	size = sctp_ssnmap_size(map->in.len, map->out.len);
126	if (size <= MAX_KMALLOC_SIZE)
127	kfree(map);
128	else
129	free_pages((unsigned long)map, get_order(size));
130	SCTP_DBG_OBJCNT_DEC(ssnmap);
131	}
132	}