Contents of /alx-src/tags/kernel26-2.6.12-alx-r9/net/sctp/ssnmap.c
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Wed Mar 4 11:03:09 2009 UTC (15 years, 3 months ago) by niro
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Wed Mar 4 11:03:09 2009 UTC (15 years, 3 months ago) by niro
File MIME type: text/plain
File size: 3538 byte(s)
Tag kernel26-2.6.12-alx-r9
1 | /* SCTP kernel reference Implementation |
2 | * Copyright (c) 2003 International Business Machines, Corp. |
3 | * |
4 | * This file is part of the SCTP kernel reference Implementation |
5 | * |
6 | * These functions manipulate sctp SSN tracker. |
7 | * |
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) |
12 | * any later version. |
13 | * |
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. |
19 | * |
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. |
24 | * |
25 | * Please send any bug reports or fixes you make to the |
26 | * email address(es): |
27 | * lksctp developers <lksctp-developers@lists.sourceforge.net> |
28 | * |
29 | * Or submit a bug report through the following website: |
30 | * http://www.sf.net/projects/lksctp |
31 | * |
32 | * Written or modified by: |
33 | * Jon Grimm <jgrimm@us.ibm.com> |
34 | * |
35 | * Any bugs reported given to us we will try to fix... any fixes shared will |
36 | * be incorporated into the next SCTP release. |
37 | */ |
38 | |
39 | #include <linux/types.h> |
40 | #include <net/sctp/sctp.h> |
41 | #include <net/sctp/sm.h> |
42 | |
43 | #define MAX_KMALLOC_SIZE 131072 |
44 | |
45 | static struct sctp_ssnmap *sctp_ssnmap_init(struct sctp_ssnmap *map, __u16 in, |
46 | __u16 out); |
47 | |
48 | /* Storage size needed for map includes 2 headers and then the |
49 | * specific needs of in or out streams. |
50 | */ |
51 | static inline size_t sctp_ssnmap_size(__u16 in, __u16 out) |
52 | { |
53 | return sizeof(struct sctp_ssnmap) + (in + out) * sizeof(__u16); |
54 | } |
55 | |
56 | |
57 | /* Create a new sctp_ssnmap. |
58 | * Allocate room to store at least 'len' contiguous TSNs. |
59 | */ |
60 | struct sctp_ssnmap *sctp_ssnmap_new(__u16 in, __u16 out, int gfp) |
61 | { |
62 | struct sctp_ssnmap *retval; |
63 | int size; |
64 | |
65 | size = sctp_ssnmap_size(in, out); |
66 | if (size <= MAX_KMALLOC_SIZE) |
67 | retval = kmalloc(size, gfp); |
68 | else |
69 | retval = (struct sctp_ssnmap *) |
70 | __get_free_pages(gfp, get_order(size)); |
71 | if (!retval) |
72 | goto fail; |
73 | |
74 | if (!sctp_ssnmap_init(retval, in, out)) |
75 | goto fail_map; |
76 | |
77 | retval->malloced = 1; |
78 | SCTP_DBG_OBJCNT_INC(ssnmap); |
79 | |
80 | return retval; |
81 | |
82 | fail_map: |
83 | if (size <= MAX_KMALLOC_SIZE) |
84 | kfree(retval); |
85 | else |
86 | free_pages((unsigned long)retval, get_order(size)); |
87 | fail: |
88 | return NULL; |
89 | } |
90 | |
91 | |
92 | /* Initialize a block of memory as a ssnmap. */ |
93 | static struct sctp_ssnmap *sctp_ssnmap_init(struct sctp_ssnmap *map, __u16 in, |
94 | __u16 out) |
95 | { |
96 | memset(map, 0x00, sctp_ssnmap_size(in, out)); |
97 | |
98 | /* Start 'in' stream just after the map header. */ |
99 | map->in.ssn = (__u16 *)&map[1]; |
100 | map->in.len = in; |
101 | |
102 | /* Start 'out' stream just after 'in'. */ |
103 | map->out.ssn = &map->in.ssn[in]; |
104 | map->out.len = out; |
105 | |
106 | return map; |
107 | } |
108 | |
109 | /* Clear out the ssnmap streams. */ |
110 | void sctp_ssnmap_clear(struct sctp_ssnmap *map) |
111 | { |
112 | size_t size; |
113 | |
114 | size = (map->in.len + map->out.len) * sizeof(__u16); |
115 | memset(map->in.ssn, 0x00, size); |
116 | } |
117 | |
118 | /* Dispose of a ssnmap. */ |
119 | void sctp_ssnmap_free(struct sctp_ssnmap *map) |
120 | { |
121 | if (map && map->malloced) { |
122 | int size; |
123 | |
124 | size = sctp_ssnmap_size(map->in.len, map->out.len); |
125 | if (size <= MAX_KMALLOC_SIZE) |
126 | kfree(map); |
127 | else |
128 | free_pages((unsigned long)map, get_order(size)); |
129 | SCTP_DBG_OBJCNT_DEC(ssnmap); |
130 | } |
131 | } |