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[/] [or1k/] [trunk/] [linux/] [linux-2.4/] [net/] [sctp/] [ssnmap.c] - Blame information for rev 1765

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1 1275 phoenix
/* SCTP kernel reference Implementation
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 * Copyright (c) 2003 International Business Machines, Corp.
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 *
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 * This file is part of the SCTP kernel reference Implementation
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 *
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 * These functions manipulate sctp SSN tracker.
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 *
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 * The SCTP reference implementation is free software;
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 * you can redistribute it and/or modify it under the terms of
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 * the GNU General Public License as published by
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 * the Free Software Foundation; either version 2, or (at your option)
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 * any later version.
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 *
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 * The SCTP reference implementation is distributed in the hope that it
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 * will be useful, but WITHOUT ANY WARRANTY; without even the implied
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 *                 ************************
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 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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 * See the GNU General Public License for more details.
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 *
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 * You should have received a copy of the GNU General Public License
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 * along with GNU CC; see the file COPYING.  If not, write to
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 * the Free Software Foundation, 59 Temple Place - Suite 330,
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 * Boston, MA 02111-1307, USA.
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 *
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 * Please send any bug reports or fixes you make to the
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 * email address(es):
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 *    lksctp developers <lksctp-developers@lists.sourceforge.net>
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 *
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 * Or submit a bug report through the following website:
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 *    http://www.sf.net/projects/lksctp
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 *
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 * Written or modified by:
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 *    Jon Grimm             <jgrimm@us.ibm.com>
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 *
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 * Any bugs reported given to us we will try to fix... any fixes shared will
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 * be incorporated into the next SCTP release.
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 */
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#include <linux/types.h>
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#include <net/sctp/sctp.h>
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#include <net/sctp/sm.h>
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#define MAX_KMALLOC_SIZE        131072
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/* Storage size needed for map includes 2 headers and then the
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 * specific needs of in or out streams.
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 */
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static inline size_t sctp_ssnmap_size(__u16 in, __u16 out)
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{
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        return sizeof(struct sctp_ssnmap) + (in + out) * sizeof(__u16);
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}
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/* Create a new sctp_ssnmap.
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 * Allocate room to store at least 'len' contiguous TSNs.
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 */
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struct sctp_ssnmap *sctp_ssnmap_new(__u16 in, __u16 out, int gfp)
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{
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        struct sctp_ssnmap *retval;
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        int size;
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        size = sctp_ssnmap_size(in, out);
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        if (size <= MAX_KMALLOC_SIZE)
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                retval = kmalloc(size, gfp);
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        else
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                retval = (struct sctp_ssnmap *)
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                          __get_free_pages(gfp, get_order(size));
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        if (!retval)
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                goto fail;
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        if (!sctp_ssnmap_init(retval, in, out))
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                goto fail_map;
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        retval->malloced = 1;
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        SCTP_DBG_OBJCNT_INC(ssnmap);
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        return retval;
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fail_map:
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        if (size <= MAX_KMALLOC_SIZE)
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                kfree(retval);
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        else
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                free_pages((unsigned long)retval, get_order(size));
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fail:
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        return NULL;
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}
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/* Initialize a block of memory as a ssnmap.  */
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struct sctp_ssnmap *sctp_ssnmap_init(struct sctp_ssnmap *map, __u16 in,
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                                     __u16 out)
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{
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        memset(map, 0x00, sctp_ssnmap_size(in, out));
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        /* Start 'in' stream just after the map header. */
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        map->in.ssn = (__u16 *)&map[1];
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        map->in.len = in;
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        /* Start 'out' stream just after 'in'. */
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        map->out.ssn = &map->in.ssn[in];
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        map->out.len = out;
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        return map;
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}
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/* Clear out the ssnmap streams.  */
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void sctp_ssnmap_clear(struct sctp_ssnmap *map)
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{
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        size_t size;
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        size = (map->in.len + map->out.len) * sizeof(__u16);
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        memset(map->in.ssn, 0x00, size);
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}
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/* Dispose of a ssnmap.  */
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void sctp_ssnmap_free(struct sctp_ssnmap *map)
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{
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        if (map && map->malloced) {
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                int size;
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                size = sctp_ssnmap_size(map->in.len, map->out.len);
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                if (size <= MAX_KMALLOC_SIZE)
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                        kfree(map);
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                else
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                        free_pages((unsigned long)map, get_order(size));
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                SCTP_DBG_OBJCNT_DEC(ssnmap);
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        }
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}

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