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/* SCTP kernel reference Implementation

 * Copyright (c) 2003 International Business Machines, Corp.

 *

 * This file is part of the SCTP kernel reference Implementation

 *

 * These functions manipulate sctp SSN tracker.

 *

 * The SCTP reference 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.

 *

 * The SCTP reference 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

/* 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, int 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.  */

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);

        }

}