132 lines
3.4 KiB
C
132 lines
3.4 KiB
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;
|
|
|
|
retval->malloced = 1;
|
|
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)
|
|
{
|
|
if (map && map->malloced) {
|
|
int size;
|
|
|
|
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);
|
|
}
|
|
}
|