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60c778b2 | 1 | /* SCTP kernel implementation |
1da177e4 LT |
2 | * Copyright (c) 2003 International Business Machines, Corp. |
3 | * | |
60c778b2 | 4 | * This file is part of the SCTP kernel implementation |
1da177e4 LT |
5 | * |
6 | * These functions manipulate sctp SSN tracker. | |
7 | * | |
60c778b2 | 8 | * This SCTP implementation is free software; |
1da177e4 LT |
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 | * | |
60c778b2 | 14 | * This SCTP implementation is distributed in the hope that it |
1da177e4 LT |
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> | |
5a0e3ad6 | 40 | #include <linux/slab.h> |
1da177e4 LT |
41 | #include <net/sctp/sctp.h> |
42 | #include <net/sctp/sm.h> | |
43 | ||
44 | #define MAX_KMALLOC_SIZE 131072 | |
45 | ||
46 | static struct sctp_ssnmap *sctp_ssnmap_init(struct sctp_ssnmap *map, __u16 in, | |
47 | __u16 out); | |
48 | ||
49 | /* Storage size needed for map includes 2 headers and then the | |
50 | * specific needs of in or out streams. | |
51 | */ | |
52 | static inline size_t sctp_ssnmap_size(__u16 in, __u16 out) | |
53 | { | |
54 | return sizeof(struct sctp_ssnmap) + (in + out) * sizeof(__u16); | |
55 | } | |
56 | ||
57 | ||
58 | /* Create a new sctp_ssnmap. | |
59 | * Allocate room to store at least 'len' contiguous TSNs. | |
60 | */ | |
3182cd84 | 61 | struct sctp_ssnmap *sctp_ssnmap_new(__u16 in, __u16 out, |
dd0fc66f | 62 | gfp_t gfp) |
1da177e4 LT |
63 | { |
64 | struct sctp_ssnmap *retval; | |
65 | int size; | |
66 | ||
67 | size = sctp_ssnmap_size(in, out); | |
68 | if (size <= MAX_KMALLOC_SIZE) | |
69 | retval = kmalloc(size, gfp); | |
70 | else | |
71 | retval = (struct sctp_ssnmap *) | |
72 | __get_free_pages(gfp, get_order(size)); | |
73 | if (!retval) | |
74 | goto fail; | |
75 | ||
76 | if (!sctp_ssnmap_init(retval, in, out)) | |
77 | goto fail_map; | |
78 | ||
79 | retval->malloced = 1; | |
80 | SCTP_DBG_OBJCNT_INC(ssnmap); | |
81 | ||
82 | return retval; | |
83 | ||
84 | fail_map: | |
85 | if (size <= MAX_KMALLOC_SIZE) | |
86 | kfree(retval); | |
87 | else | |
88 | free_pages((unsigned long)retval, get_order(size)); | |
89 | fail: | |
90 | return NULL; | |
91 | } | |
92 | ||
93 | ||
94 | /* Initialize a block of memory as a ssnmap. */ | |
95 | static struct sctp_ssnmap *sctp_ssnmap_init(struct sctp_ssnmap *map, __u16 in, | |
96 | __u16 out) | |
97 | { | |
98 | memset(map, 0x00, sctp_ssnmap_size(in, out)); | |
99 | ||
100 | /* Start 'in' stream just after the map header. */ | |
101 | map->in.ssn = (__u16 *)&map[1]; | |
102 | map->in.len = in; | |
103 | ||
104 | /* Start 'out' stream just after 'in'. */ | |
105 | map->out.ssn = &map->in.ssn[in]; | |
106 | map->out.len = out; | |
107 | ||
108 | return map; | |
109 | } | |
110 | ||
111 | /* Clear out the ssnmap streams. */ | |
112 | void sctp_ssnmap_clear(struct sctp_ssnmap *map) | |
113 | { | |
114 | size_t size; | |
115 | ||
116 | size = (map->in.len + map->out.len) * sizeof(__u16); | |
117 | memset(map->in.ssn, 0x00, size); | |
118 | } | |
119 | ||
120 | /* Dispose of a ssnmap. */ | |
121 | void sctp_ssnmap_free(struct sctp_ssnmap *map) | |
122 | { | |
123 | if (map && map->malloced) { | |
124 | int size; | |
125 | ||
126 | size = sctp_ssnmap_size(map->in.len, map->out.len); | |
127 | if (size <= MAX_KMALLOC_SIZE) | |
128 | kfree(map); | |
129 | else | |
130 | free_pages((unsigned long)map, get_order(size)); | |
131 | SCTP_DBG_OBJCNT_DEC(ssnmap); | |
132 | } | |
133 | } |