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Source at commit be977234bfb4a6dca8a39e7c52165e4cd536ad71 created 12 years 9 months ago. By Lars-Peter Clausen, jz4740: Fix compile error | |
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1 | /* |
2 | * Cryptographic API. |
3 | * |
4 | * Deflate algorithm (RFC 1951), implemented here primarily for use |
5 | * by IPCOMP (RFC 3173 & RFC 2394). |
6 | * |
7 | * Copyright (c) 2003 James Morris <jmorris@intercode.com.au> |
8 | * |
9 | * This program is free software; you can redistribute it and/or modify it |
10 | * under the terms of the GNU General Public License as published by the Free |
11 | * Software Foundation; either version 2 of the License, or (at your option) |
12 | * any later version. |
13 | * |
14 | * FIXME: deflate transforms will require up to a total of about 436k of kernel |
15 | * memory on i386 (390k for compression, the rest for decompression), as the |
16 | * current zlib kernel code uses a worst case pre-allocation system by default. |
17 | * This needs to be fixed so that the amount of memory required is properly |
18 | * related to the winbits and memlevel parameters. |
19 | * |
20 | * The default winbits of 11 should suit most packets, and it may be something |
21 | * to configure on a per-tfm basis in the future. |
22 | * |
23 | * Currently, compression history is not maintained between tfm calls, as |
24 | * it is not needed for IPCOMP and keeps the code simpler. It can be |
25 | * implemented if someone wants it. |
26 | */ |
27 | #include <linux/init.h> |
28 | #include <linux/module.h> |
29 | #include <linux/crypto.h> |
30 | #include <linux/zlib.h> |
31 | #include <linux/vmalloc.h> |
32 | #include <linux/interrupt.h> |
33 | #include <linux/mm.h> |
34 | #include <linux/net.h> |
35 | #include <linux/slab.h> |
36 | |
37 | #define DEFLATE_DEF_LEVEL Z_DEFAULT_COMPRESSION |
38 | #define DEFLATE_DEF_WINBITS 11 |
39 | #define DEFLATE_DEF_MEMLEVEL MAX_MEM_LEVEL |
40 | |
41 | struct deflate_ctx { |
42 | struct z_stream_s comp_stream; |
43 | struct z_stream_s decomp_stream; |
44 | }; |
45 | |
46 | static int deflate_comp_init(struct deflate_ctx *ctx) |
47 | { |
48 | int ret = 0; |
49 | struct z_stream_s *stream = &ctx->comp_stream; |
50 | |
51 | stream->workspace = vzalloc(zlib_deflate_workspacesize( |
52 | -DEFLATE_DEF_WINBITS, DEFLATE_DEF_MEMLEVEL)); |
53 | if (!stream->workspace) { |
54 | ret = -ENOMEM; |
55 | goto out; |
56 | } |
57 | ret = zlib_deflateInit2(stream, DEFLATE_DEF_LEVEL, Z_DEFLATED, |
58 | -DEFLATE_DEF_WINBITS, DEFLATE_DEF_MEMLEVEL, |
59 | Z_DEFAULT_STRATEGY); |
60 | if (ret != Z_OK) { |
61 | ret = -EINVAL; |
62 | goto out_free; |
63 | } |
64 | out: |
65 | return ret; |
66 | out_free: |
67 | vfree(stream->workspace); |
68 | goto out; |
69 | } |
70 | |
71 | static int deflate_decomp_init(struct deflate_ctx *ctx) |
72 | { |
73 | int ret = 0; |
74 | struct z_stream_s *stream = &ctx->decomp_stream; |
75 | |
76 | stream->workspace = kzalloc(zlib_inflate_workspacesize(), GFP_KERNEL); |
77 | if (!stream->workspace) { |
78 | ret = -ENOMEM; |
79 | goto out; |
80 | } |
81 | ret = zlib_inflateInit2(stream, -DEFLATE_DEF_WINBITS); |
82 | if (ret != Z_OK) { |
83 | ret = -EINVAL; |
84 | goto out_free; |
85 | } |
86 | out: |
87 | return ret; |
88 | out_free: |
89 | kfree(stream->workspace); |
90 | goto out; |
91 | } |
92 | |
93 | static void deflate_comp_exit(struct deflate_ctx *ctx) |
94 | { |
95 | zlib_deflateEnd(&ctx->comp_stream); |
96 | vfree(ctx->comp_stream.workspace); |
97 | } |
98 | |
99 | static void deflate_decomp_exit(struct deflate_ctx *ctx) |
100 | { |
101 | zlib_inflateEnd(&ctx->decomp_stream); |
102 | kfree(ctx->decomp_stream.workspace); |
103 | } |
104 | |
105 | static int deflate_init(struct crypto_tfm *tfm) |
106 | { |
107 | struct deflate_ctx *ctx = crypto_tfm_ctx(tfm); |
108 | int ret; |
109 | |
110 | ret = deflate_comp_init(ctx); |
111 | if (ret) |
112 | goto out; |
113 | ret = deflate_decomp_init(ctx); |
114 | if (ret) |
115 | deflate_comp_exit(ctx); |
116 | out: |
117 | return ret; |
118 | } |
119 | |
120 | static void deflate_exit(struct crypto_tfm *tfm) |
121 | { |
122 | struct deflate_ctx *ctx = crypto_tfm_ctx(tfm); |
123 | |
124 | deflate_comp_exit(ctx); |
125 | deflate_decomp_exit(ctx); |
126 | } |
127 | |
128 | static int deflate_compress(struct crypto_tfm *tfm, const u8 *src, |
129 | unsigned int slen, u8 *dst, unsigned int *dlen) |
130 | { |
131 | int ret = 0; |
132 | struct deflate_ctx *dctx = crypto_tfm_ctx(tfm); |
133 | struct z_stream_s *stream = &dctx->comp_stream; |
134 | |
135 | ret = zlib_deflateReset(stream); |
136 | if (ret != Z_OK) { |
137 | ret = -EINVAL; |
138 | goto out; |
139 | } |
140 | |
141 | stream->next_in = (u8 *)src; |
142 | stream->avail_in = slen; |
143 | stream->next_out = (u8 *)dst; |
144 | stream->avail_out = *dlen; |
145 | |
146 | ret = zlib_deflate(stream, Z_FINISH); |
147 | if (ret != Z_STREAM_END) { |
148 | ret = -EINVAL; |
149 | goto out; |
150 | } |
151 | ret = 0; |
152 | *dlen = stream->total_out; |
153 | out: |
154 | return ret; |
155 | } |
156 | |
157 | static int deflate_decompress(struct crypto_tfm *tfm, const u8 *src, |
158 | unsigned int slen, u8 *dst, unsigned int *dlen) |
159 | { |
160 | |
161 | int ret = 0; |
162 | struct deflate_ctx *dctx = crypto_tfm_ctx(tfm); |
163 | struct z_stream_s *stream = &dctx->decomp_stream; |
164 | |
165 | ret = zlib_inflateReset(stream); |
166 | if (ret != Z_OK) { |
167 | ret = -EINVAL; |
168 | goto out; |
169 | } |
170 | |
171 | stream->next_in = (u8 *)src; |
172 | stream->avail_in = slen; |
173 | stream->next_out = (u8 *)dst; |
174 | stream->avail_out = *dlen; |
175 | |
176 | ret = zlib_inflate(stream, Z_SYNC_FLUSH); |
177 | /* |
178 | * Work around a bug in zlib, which sometimes wants to taste an extra |
179 | * byte when being used in the (undocumented) raw deflate mode. |
180 | * (From USAGI). |
181 | */ |
182 | if (ret == Z_OK && !stream->avail_in && stream->avail_out) { |
183 | u8 zerostuff = 0; |
184 | stream->next_in = &zerostuff; |
185 | stream->avail_in = 1; |
186 | ret = zlib_inflate(stream, Z_FINISH); |
187 | } |
188 | if (ret != Z_STREAM_END) { |
189 | ret = -EINVAL; |
190 | goto out; |
191 | } |
192 | ret = 0; |
193 | *dlen = stream->total_out; |
194 | out: |
195 | return ret; |
196 | } |
197 | |
198 | static struct crypto_alg alg = { |
199 | .cra_name = "deflate", |
200 | .cra_flags = CRYPTO_ALG_TYPE_COMPRESS, |
201 | .cra_ctxsize = sizeof(struct deflate_ctx), |
202 | .cra_module = THIS_MODULE, |
203 | .cra_list = LIST_HEAD_INIT(alg.cra_list), |
204 | .cra_init = deflate_init, |
205 | .cra_exit = deflate_exit, |
206 | .cra_u = { .compress = { |
207 | .coa_compress = deflate_compress, |
208 | .coa_decompress = deflate_decompress } } |
209 | }; |
210 | |
211 | static int __init deflate_mod_init(void) |
212 | { |
213 | return crypto_register_alg(&alg); |
214 | } |
215 | |
216 | static void __exit deflate_mod_fini(void) |
217 | { |
218 | crypto_unregister_alg(&alg); |
219 | } |
220 | |
221 | module_init(deflate_mod_init); |
222 | module_exit(deflate_mod_fini); |
223 | |
224 | MODULE_LICENSE("GPL"); |
225 | MODULE_DESCRIPTION("Deflate Compression Algorithm for IPCOMP"); |
226 | MODULE_AUTHOR("James Morris <jmorris@intercode.com.au>"); |
227 | |
228 |
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