1 /* SCTP kernel reference Implementation
2 * Copyright (c) 2003 International Business Machines, Corp.
4 * This file is part of the SCTP kernel reference Implementation
6 * These functions manipulate sctp SSN tracker.
8 * The SCTP reference implementation is free software;
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)
14 * The SCTP reference implementation is distributed in the hope that it
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.
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.
25 * Please send any bug reports or fixes you make to the
27 * lksctp developers <lksctp-developers@lists.sourceforge.net>
29 * Or submit a bug report through the following website:
30 * http://www.sf.net/projects/lksctp
32 * Written or modified by:
33 * Jon Grimm <jgrimm@us.ibm.com>
35 * Any bugs reported given to us we will try to fix... any fixes shared will
36 * be incorporated into the next SCTP release.
39 #include <linux/types.h>
40 #include <net/sctp/sctp.h>
41 #include <net/sctp/sm.h>
43 #define MAX_KMALLOC_SIZE 131072
45 /* Storage size needed for map includes 2 headers and then the
46 * specific needs of in or out streams.
48 static inline size_t sctp_ssnmap_size(__u16 in, __u16 out)
50 return sizeof(struct sctp_ssnmap) + (in + out) * sizeof(__u16);
54 /* Create a new sctp_ssnmap.
55 * Allocate room to store at least 'len' contiguous TSNs.
57 struct sctp_ssnmap *sctp_ssnmap_new(__u16 in, __u16 out, int gfp)
59 struct sctp_ssnmap *retval;
62 size = sctp_ssnmap_size(in, out);
63 if (size <= MAX_KMALLOC_SIZE)
64 retval = kmalloc(size, gfp);
66 retval = (struct sctp_ssnmap *)
67 __get_free_pages(gfp, get_order(size));
71 if (!sctp_ssnmap_init(retval, in, out))
75 SCTP_DBG_OBJCNT_INC(ssnmap);
80 if (size <= MAX_KMALLOC_SIZE)
83 free_pages((unsigned long)retval, get_order(size));
89 /* Initialize a block of memory as a ssnmap. */
90 struct sctp_ssnmap *sctp_ssnmap_init(struct sctp_ssnmap *map, __u16 in,
93 memset(map, 0x00, sctp_ssnmap_size(in, out));
95 /* Start 'in' stream just after the map header. */
96 map->in.ssn = (__u16 *)&map[1];
99 /* Start 'out' stream just after 'in'. */
100 map->out.ssn = &map->in.ssn[in];
106 /* Clear out the ssnmap streams. */
107 void sctp_ssnmap_clear(struct sctp_ssnmap *map)
111 size = (map->in.len + map->out.len) * sizeof(__u16);
112 memset(map->in.ssn, 0x00, size);
115 /* Dispose of a ssnmap. */
116 void sctp_ssnmap_free(struct sctp_ssnmap *map)
118 if (map && map->malloced) {
121 size = sctp_ssnmap_size(map->in.len, map->out.len);
122 if (size <= MAX_KMALLOC_SIZE)
125 free_pages((unsigned long)map, get_order(size));
126 SCTP_DBG_OBJCNT_DEC(ssnmap);