1 /* SCTP kernel implementation
2 * Copyright (c) 2003 International Business Machines, Corp.
4 * This file is part of the SCTP kernel implementation
6 * These functions manipulate sctp SSN tracker.
8 * This SCTP 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 * This SCTP 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, see
22 * <http://www.gnu.org/licenses/>.
24 * Please send any bug reports or fixes you make to the
26 * lksctp developers <linux-sctp@vger.kernel.org>
28 * Written or modified by:
29 * Jon Grimm <jgrimm@us.ibm.com>
32 #include <linux/types.h>
33 #include <linux/slab.h>
34 #include <net/sctp/sctp.h>
35 #include <net/sctp/sm.h>
37 static struct sctp_ssnmap *sctp_ssnmap_init(struct sctp_ssnmap *map, __u16 in,
40 /* Storage size needed for map includes 2 headers and then the
41 * specific needs of in or out streams.
43 static inline size_t sctp_ssnmap_size(__u16 in, __u16 out)
45 return sizeof(struct sctp_ssnmap) + (in + out) * sizeof(__u16);
49 /* Create a new sctp_ssnmap.
50 * Allocate room to store at least 'len' contiguous TSNs.
52 struct sctp_ssnmap *sctp_ssnmap_new(__u16 in, __u16 out,
55 struct sctp_ssnmap *retval;
58 size = sctp_ssnmap_size(in, out);
59 if (size <= KMALLOC_MAX_SIZE)
60 retval = kmalloc(size, gfp);
62 retval = (struct sctp_ssnmap *)
63 __get_free_pages(gfp, get_order(size));
67 if (!sctp_ssnmap_init(retval, in, out))
70 SCTP_DBG_OBJCNT_INC(ssnmap);
75 if (size <= KMALLOC_MAX_SIZE)
78 free_pages((unsigned long)retval, get_order(size));
84 /* Initialize a block of memory as a ssnmap. */
85 static struct sctp_ssnmap *sctp_ssnmap_init(struct sctp_ssnmap *map, __u16 in,
88 memset(map, 0x00, sctp_ssnmap_size(in, out));
90 /* Start 'in' stream just after the map header. */
91 map->in.ssn = (__u16 *)&map[1];
94 /* Start 'out' stream just after 'in'. */
95 map->out.ssn = &map->in.ssn[in];
101 /* Clear out the ssnmap streams. */
102 void sctp_ssnmap_clear(struct sctp_ssnmap *map)
106 size = (map->in.len + map->out.len) * sizeof(__u16);
107 memset(map->in.ssn, 0x00, size);
110 /* Dispose of a ssnmap. */
111 void sctp_ssnmap_free(struct sctp_ssnmap *map)
118 size = sctp_ssnmap_size(map->in.len, map->out.len);
119 if (size <= KMALLOC_MAX_SIZE)
122 free_pages((unsigned long)map, get_order(size));
124 SCTP_DBG_OBJCNT_DEC(ssnmap);