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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(); |
98 | stream->workspace = vzalloc(workspacesize); |
99 | if (!stream->workspace) |
100 | return -ENOMEM; |
101 | |
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 | |
167 | ret = req->avail_out - stream->avail_out; |
168 | pr_debug("avail_in %u, avail_out %u (consumed %u, produced %u)\n", |
169 | stream->avail_in, stream->avail_out, |
170 | req->avail_in - stream->avail_in, ret); |
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; |
175 | return ret; |
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 | |
197 | ret = req->avail_out - stream->avail_out; |
198 | pr_debug("avail_in %u, avail_out %u (consumed %u, produced %u)\n", |
199 | stream->avail_in, stream->avail_out, |
200 | req->avail_in - stream->avail_in, ret); |
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; |
205 | return ret; |
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 | |
282 | ret = req->avail_out - stream->avail_out; |
283 | pr_debug("avail_in %u, avail_out %u (consumed %u, produced %u)\n", |
284 | stream->avail_in, stream->avail_out, |
285 | req->avail_in - stream->avail_in, ret); |
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; |
290 | return ret; |
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 | |
330 | ret = req->avail_out - stream->avail_out; |
331 | pr_debug("avail_in %u, avail_out %u (consumed %u, produced %u)\n", |
332 | stream->avail_in, stream->avail_out, |
333 | req->avail_in - stream->avail_in, ret); |
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; |
338 | return ret; |
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"); |
378 |
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