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bf68e65e GU |
1 | /* |
2 | * Cryptographic API. | |
3 | * | |
4 | * Zlib algorithm | |
5 | * | |
6 | * Copyright 2008 Sony Corporation | |
7 | * | |
8 | * Based on deflate.c, which is | |
9 | * Copyright (c) 2003 James Morris <jmorris@intercode.com.au> | |
10 | * | |
11 | * This program is free software; you can redistribute it and/or modify it | |
12 | * under the terms of the GNU General Public License as published by the Free | |
13 | * Software Foundation; either version 2 of the License, or (at your option) | |
14 | * any later version. | |
15 | * | |
16 | * FIXME: deflate transforms will require up to a total of about 436k of kernel | |
17 | * memory on i386 (390k for compression, the rest for decompression), as the | |
18 | * current zlib kernel code uses a worst case pre-allocation system by default. | |
19 | * This needs to be fixed so that the amount of memory required is properly | |
20 | * related to the winbits and memlevel parameters. | |
21 | */ | |
22 | ||
23 | #define pr_fmt(fmt) "%s: " fmt, __func__ | |
24 | ||
25 | #include <linux/init.h> | |
26 | #include <linux/module.h> | |
27 | #include <linux/zlib.h> | |
28 | #include <linux/vmalloc.h> | |
29 | #include <linux/interrupt.h> | |
30 | #include <linux/mm.h> | |
31 | #include <linux/net.h> | |
32 | #include <linux/slab.h> | |
33 | ||
34 | #include <crypto/internal/compress.h> | |
35 | ||
36 | #include <net/netlink.h> | |
37 | ||
38 | ||
39 | struct zlib_ctx { | |
40 | struct z_stream_s comp_stream; | |
41 | struct z_stream_s decomp_stream; | |
42 | int decomp_windowBits; | |
43 | }; | |
44 | ||
45 | ||
46 | static void zlib_comp_exit(struct zlib_ctx *ctx) | |
47 | { | |
48 | struct z_stream_s *stream = &ctx->comp_stream; | |
49 | ||
50 | if (stream->workspace) { | |
51 | zlib_deflateEnd(stream); | |
52 | vfree(stream->workspace); | |
53 | stream->workspace = NULL; | |
54 | } | |
55 | } | |
56 | ||
57 | static void zlib_decomp_exit(struct zlib_ctx *ctx) | |
58 | { | |
59 | struct z_stream_s *stream = &ctx->decomp_stream; | |
60 | ||
61 | if (stream->workspace) { | |
62 | zlib_inflateEnd(stream); | |
63 | kfree(stream->workspace); | |
64 | stream->workspace = NULL; | |
65 | } | |
66 | } | |
67 | ||
68 | static int zlib_init(struct crypto_tfm *tfm) | |
69 | { | |
70 | return 0; | |
71 | } | |
72 | ||
73 | static void zlib_exit(struct crypto_tfm *tfm) | |
74 | { | |
75 | struct zlib_ctx *ctx = crypto_tfm_ctx(tfm); | |
76 | ||
77 | zlib_comp_exit(ctx); | |
78 | zlib_decomp_exit(ctx); | |
79 | } | |
80 | ||
81 | ||
82 | static int zlib_compress_setup(struct crypto_pcomp *tfm, void *params, | |
83 | unsigned int len) | |
84 | { | |
85 | struct zlib_ctx *ctx = crypto_tfm_ctx(crypto_pcomp_tfm(tfm)); | |
86 | struct z_stream_s *stream = &ctx->comp_stream; | |
87 | struct nlattr *tb[ZLIB_COMP_MAX + 1]; | |
88 | size_t workspacesize; | |
89 | int ret; | |
90 | ||
91 | ret = nla_parse(tb, ZLIB_COMP_MAX, params, len, NULL); | |
92 | if (ret) | |
93 | return ret; | |
94 | ||
95 | zlib_comp_exit(ctx); | |
96 | ||
97 | workspacesize = zlib_deflate_workspacesize(); | |
c8484594 | 98 | stream->workspace = vzalloc(workspacesize); |
bf68e65e GU |
99 | if (!stream->workspace) |
100 | return -ENOMEM; | |
101 | ||
bf68e65e GU |
102 | ret = zlib_deflateInit2(stream, |
103 | tb[ZLIB_COMP_LEVEL] | |
104 | ? nla_get_u32(tb[ZLIB_COMP_LEVEL]) | |
105 | : Z_DEFAULT_COMPRESSION, | |
106 | tb[ZLIB_COMP_METHOD] | |
107 | ? nla_get_u32(tb[ZLIB_COMP_METHOD]) | |
108 | : Z_DEFLATED, | |
109 | tb[ZLIB_COMP_WINDOWBITS] | |
110 | ? nla_get_u32(tb[ZLIB_COMP_WINDOWBITS]) | |
111 | : MAX_WBITS, | |
112 | tb[ZLIB_COMP_MEMLEVEL] | |
113 | ? nla_get_u32(tb[ZLIB_COMP_MEMLEVEL]) | |
114 | : DEF_MEM_LEVEL, | |
115 | tb[ZLIB_COMP_STRATEGY] | |
116 | ? nla_get_u32(tb[ZLIB_COMP_STRATEGY]) | |
117 | : Z_DEFAULT_STRATEGY); | |
118 | if (ret != Z_OK) { | |
119 | vfree(stream->workspace); | |
120 | stream->workspace = NULL; | |
121 | return -EINVAL; | |
122 | } | |
123 | ||
124 | return 0; | |
125 | } | |
126 | ||
127 | static int zlib_compress_init(struct crypto_pcomp *tfm) | |
128 | { | |
129 | int ret; | |
130 | struct zlib_ctx *dctx = crypto_tfm_ctx(crypto_pcomp_tfm(tfm)); | |
131 | struct z_stream_s *stream = &dctx->comp_stream; | |
132 | ||
133 | ret = zlib_deflateReset(stream); | |
134 | if (ret != Z_OK) | |
135 | return -EINVAL; | |
136 | ||
137 | return 0; | |
138 | } | |
139 | ||
140 | static int zlib_compress_update(struct crypto_pcomp *tfm, | |
141 | struct comp_request *req) | |
142 | { | |
143 | int ret; | |
144 | struct zlib_ctx *dctx = crypto_tfm_ctx(crypto_pcomp_tfm(tfm)); | |
145 | struct z_stream_s *stream = &dctx->comp_stream; | |
146 | ||
147 | pr_debug("avail_in %u, avail_out %u\n", req->avail_in, req->avail_out); | |
148 | stream->next_in = req->next_in; | |
149 | stream->avail_in = req->avail_in; | |
150 | stream->next_out = req->next_out; | |
151 | stream->avail_out = req->avail_out; | |
152 | ||
153 | ret = zlib_deflate(stream, Z_NO_FLUSH); | |
154 | switch (ret) { | |
155 | case Z_OK: | |
156 | break; | |
157 | ||
158 | case Z_BUF_ERROR: | |
159 | pr_debug("zlib_deflate could not make progress\n"); | |
160 | return -EAGAIN; | |
161 | ||
162 | default: | |
163 | pr_debug("zlib_deflate failed %d\n", ret); | |
164 | return -EINVAL; | |
165 | } | |
166 | ||
3ce858cb | 167 | ret = req->avail_out - stream->avail_out; |
bf68e65e GU |
168 | pr_debug("avail_in %u, avail_out %u (consumed %u, produced %u)\n", |
169 | stream->avail_in, stream->avail_out, | |
3ce858cb | 170 | req->avail_in - stream->avail_in, ret); |
bf68e65e GU |
171 | req->next_in = stream->next_in; |
172 | req->avail_in = stream->avail_in; | |
173 | req->next_out = stream->next_out; | |
174 | req->avail_out = stream->avail_out; | |
3ce858cb | 175 | return ret; |
bf68e65e GU |
176 | } |
177 | ||
178 | static int zlib_compress_final(struct crypto_pcomp *tfm, | |
179 | struct comp_request *req) | |
180 | { | |
181 | int ret; | |
182 | struct zlib_ctx *dctx = crypto_tfm_ctx(crypto_pcomp_tfm(tfm)); | |
183 | struct z_stream_s *stream = &dctx->comp_stream; | |
184 | ||
185 | pr_debug("avail_in %u, avail_out %u\n", req->avail_in, req->avail_out); | |
186 | stream->next_in = req->next_in; | |
187 | stream->avail_in = req->avail_in; | |
188 | stream->next_out = req->next_out; | |
189 | stream->avail_out = req->avail_out; | |
190 | ||
191 | ret = zlib_deflate(stream, Z_FINISH); | |
192 | if (ret != Z_STREAM_END) { | |
193 | pr_debug("zlib_deflate failed %d\n", ret); | |
194 | return -EINVAL; | |
195 | } | |
196 | ||
3ce858cb | 197 | ret = req->avail_out - stream->avail_out; |
bf68e65e GU |
198 | pr_debug("avail_in %u, avail_out %u (consumed %u, produced %u)\n", |
199 | stream->avail_in, stream->avail_out, | |
3ce858cb | 200 | req->avail_in - stream->avail_in, ret); |
bf68e65e GU |
201 | req->next_in = stream->next_in; |
202 | req->avail_in = stream->avail_in; | |
203 | req->next_out = stream->next_out; | |
204 | req->avail_out = stream->avail_out; | |
3ce858cb | 205 | return ret; |
bf68e65e GU |
206 | } |
207 | ||
208 | ||
209 | static int zlib_decompress_setup(struct crypto_pcomp *tfm, void *params, | |
210 | unsigned int len) | |
211 | { | |
212 | struct zlib_ctx *ctx = crypto_tfm_ctx(crypto_pcomp_tfm(tfm)); | |
213 | struct z_stream_s *stream = &ctx->decomp_stream; | |
214 | struct nlattr *tb[ZLIB_DECOMP_MAX + 1]; | |
215 | int ret = 0; | |
216 | ||
217 | ret = nla_parse(tb, ZLIB_DECOMP_MAX, params, len, NULL); | |
218 | if (ret) | |
219 | return ret; | |
220 | ||
221 | zlib_decomp_exit(ctx); | |
222 | ||
223 | ctx->decomp_windowBits = tb[ZLIB_DECOMP_WINDOWBITS] | |
224 | ? nla_get_u32(tb[ZLIB_DECOMP_WINDOWBITS]) | |
225 | : DEF_WBITS; | |
226 | ||
227 | stream->workspace = kzalloc(zlib_inflate_workspacesize(), GFP_KERNEL); | |
228 | if (!stream->workspace) | |
229 | return -ENOMEM; | |
230 | ||
231 | ret = zlib_inflateInit2(stream, ctx->decomp_windowBits); | |
232 | if (ret != Z_OK) { | |
233 | kfree(stream->workspace); | |
234 | stream->workspace = NULL; | |
235 | return -EINVAL; | |
236 | } | |
237 | ||
238 | return 0; | |
239 | } | |
240 | ||
241 | static int zlib_decompress_init(struct crypto_pcomp *tfm) | |
242 | { | |
243 | int ret; | |
244 | struct zlib_ctx *dctx = crypto_tfm_ctx(crypto_pcomp_tfm(tfm)); | |
245 | struct z_stream_s *stream = &dctx->decomp_stream; | |
246 | ||
247 | ret = zlib_inflateReset(stream); | |
248 | if (ret != Z_OK) | |
249 | return -EINVAL; | |
250 | ||
251 | return 0; | |
252 | } | |
253 | ||
254 | static int zlib_decompress_update(struct crypto_pcomp *tfm, | |
255 | struct comp_request *req) | |
256 | { | |
257 | int ret; | |
258 | struct zlib_ctx *dctx = crypto_tfm_ctx(crypto_pcomp_tfm(tfm)); | |
259 | struct z_stream_s *stream = &dctx->decomp_stream; | |
260 | ||
261 | pr_debug("avail_in %u, avail_out %u\n", req->avail_in, req->avail_out); | |
262 | stream->next_in = req->next_in; | |
263 | stream->avail_in = req->avail_in; | |
264 | stream->next_out = req->next_out; | |
265 | stream->avail_out = req->avail_out; | |
266 | ||
267 | ret = zlib_inflate(stream, Z_SYNC_FLUSH); | |
268 | switch (ret) { | |
269 | case Z_OK: | |
270 | case Z_STREAM_END: | |
271 | break; | |
272 | ||
273 | case Z_BUF_ERROR: | |
274 | pr_debug("zlib_inflate could not make progress\n"); | |
275 | return -EAGAIN; | |
276 | ||
277 | default: | |
278 | pr_debug("zlib_inflate failed %d\n", ret); | |
279 | return -EINVAL; | |
280 | } | |
281 | ||
3ce858cb | 282 | ret = req->avail_out - stream->avail_out; |
bf68e65e GU |
283 | pr_debug("avail_in %u, avail_out %u (consumed %u, produced %u)\n", |
284 | stream->avail_in, stream->avail_out, | |
3ce858cb | 285 | req->avail_in - stream->avail_in, ret); |
bf68e65e GU |
286 | req->next_in = stream->next_in; |
287 | req->avail_in = stream->avail_in; | |
288 | req->next_out = stream->next_out; | |
289 | req->avail_out = stream->avail_out; | |
3ce858cb | 290 | return ret; |
bf68e65e GU |
291 | } |
292 | ||
293 | static int zlib_decompress_final(struct crypto_pcomp *tfm, | |
294 | struct comp_request *req) | |
295 | { | |
296 | int ret; | |
297 | struct zlib_ctx *dctx = crypto_tfm_ctx(crypto_pcomp_tfm(tfm)); | |
298 | struct z_stream_s *stream = &dctx->decomp_stream; | |
299 | ||
300 | pr_debug("avail_in %u, avail_out %u\n", req->avail_in, req->avail_out); | |
301 | stream->next_in = req->next_in; | |
302 | stream->avail_in = req->avail_in; | |
303 | stream->next_out = req->next_out; | |
304 | stream->avail_out = req->avail_out; | |
305 | ||
306 | if (dctx->decomp_windowBits < 0) { | |
307 | ret = zlib_inflate(stream, Z_SYNC_FLUSH); | |
308 | /* | |
309 | * Work around a bug in zlib, which sometimes wants to taste an | |
310 | * extra byte when being used in the (undocumented) raw deflate | |
311 | * mode. (From USAGI). | |
312 | */ | |
313 | if (ret == Z_OK && !stream->avail_in && stream->avail_out) { | |
314 | const void *saved_next_in = stream->next_in; | |
315 | u8 zerostuff = 0; | |
316 | ||
317 | stream->next_in = &zerostuff; | |
318 | stream->avail_in = 1; | |
319 | ret = zlib_inflate(stream, Z_FINISH); | |
320 | stream->next_in = saved_next_in; | |
321 | stream->avail_in = 0; | |
322 | } | |
323 | } else | |
324 | ret = zlib_inflate(stream, Z_FINISH); | |
325 | if (ret != Z_STREAM_END) { | |
326 | pr_debug("zlib_inflate failed %d\n", ret); | |
327 | return -EINVAL; | |
328 | } | |
329 | ||
3ce858cb | 330 | ret = req->avail_out - stream->avail_out; |
bf68e65e GU |
331 | pr_debug("avail_in %u, avail_out %u (consumed %u, produced %u)\n", |
332 | stream->avail_in, stream->avail_out, | |
3ce858cb | 333 | req->avail_in - stream->avail_in, ret); |
bf68e65e GU |
334 | req->next_in = stream->next_in; |
335 | req->avail_in = stream->avail_in; | |
336 | req->next_out = stream->next_out; | |
337 | req->avail_out = stream->avail_out; | |
3ce858cb | 338 | return ret; |
bf68e65e GU |
339 | } |
340 | ||
341 | ||
342 | static struct pcomp_alg zlib_alg = { | |
343 | .compress_setup = zlib_compress_setup, | |
344 | .compress_init = zlib_compress_init, | |
345 | .compress_update = zlib_compress_update, | |
346 | .compress_final = zlib_compress_final, | |
347 | .decompress_setup = zlib_decompress_setup, | |
348 | .decompress_init = zlib_decompress_init, | |
349 | .decompress_update = zlib_decompress_update, | |
350 | .decompress_final = zlib_decompress_final, | |
351 | ||
352 | .base = { | |
353 | .cra_name = "zlib", | |
354 | .cra_flags = CRYPTO_ALG_TYPE_PCOMPRESS, | |
355 | .cra_ctxsize = sizeof(struct zlib_ctx), | |
356 | .cra_module = THIS_MODULE, | |
357 | .cra_init = zlib_init, | |
358 | .cra_exit = zlib_exit, | |
359 | } | |
360 | }; | |
361 | ||
362 | static int __init zlib_mod_init(void) | |
363 | { | |
364 | return crypto_register_pcomp(&zlib_alg); | |
365 | } | |
366 | ||
367 | static void __exit zlib_mod_fini(void) | |
368 | { | |
369 | crypto_unregister_pcomp(&zlib_alg); | |
370 | } | |
371 | ||
372 | module_init(zlib_mod_init); | |
373 | module_exit(zlib_mod_fini); | |
374 | ||
375 | MODULE_LICENSE("GPL"); | |
376 | MODULE_DESCRIPTION("Zlib Compression Algorithm"); | |
377 | MODULE_AUTHOR("Sony Corporation"); |