126 lines
3.1 KiB
C
126 lines
3.1 KiB
C
/* SCTP kernel 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 implementation
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*
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* These functions manipulate sctp SSN tracker.
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*
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* This SCTP 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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* This SCTP 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, see
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* <http://www.gnu.org/licenses/>.
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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 <linux-sctp@vger.kernel.org>
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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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#include <linux/types.h>
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#include <linux/slab.h>
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#include <net/sctp/sctp.h>
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#include <net/sctp/sm.h>
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static struct sctp_ssnmap *sctp_ssnmap_init(struct sctp_ssnmap *map, __u16 in,
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__u16 out);
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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,
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gfp_t 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 <= KMALLOC_MAX_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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SCTP_DBG_OBJCNT_INC(ssnmap);
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return retval;
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fail_map:
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if (size <= KMALLOC_MAX_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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static 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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int size;
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if (unlikely(!map))
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return;
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size = sctp_ssnmap_size(map->in.len, map->out.len);
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if (size <= KMALLOC_MAX_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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