1 // SPDX-License-Identifier: GPL-2.0-or-later 1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /* 2 /*
3 * Cryptographic API. 3 * Cryptographic API.
4 * 4 *
5 * Deflate algorithm (RFC 1951), implemented h 5 * Deflate algorithm (RFC 1951), implemented here primarily for use
6 * by IPCOMP (RFC 3173 & RFC 2394). 6 * by IPCOMP (RFC 3173 & RFC 2394).
7 * 7 *
8 * Copyright (c) 2003 James Morris <jmorris@in 8 * Copyright (c) 2003 James Morris <jmorris@intercode.com.au>
9 * 9 *
10 * FIXME: deflate transforms will require up t 10 * FIXME: deflate transforms will require up to a total of about 436k of kernel
11 * memory on i386 (390k for compression, the r 11 * memory on i386 (390k for compression, the rest for decompression), as the
12 * current zlib kernel code uses a worst case 12 * current zlib kernel code uses a worst case pre-allocation system by default.
13 * This needs to be fixed so that the amount o 13 * This needs to be fixed so that the amount of memory required is properly
14 * related to the winbits and memlevel parame 14 * related to the winbits and memlevel parameters.
15 * 15 *
16 * The default winbits of 11 should suit most 16 * The default winbits of 11 should suit most packets, and it may be something
17 * to configure on a per-tfm basis in the futu 17 * to configure on a per-tfm basis in the future.
18 * 18 *
19 * Currently, compression history is not maint 19 * Currently, compression history is not maintained between tfm calls, as
20 * it is not needed for IPCOMP and keeps the c 20 * it is not needed for IPCOMP and keeps the code simpler. It can be
21 * implemented if someone wants it. 21 * implemented if someone wants it.
22 */ 22 */
23 #include <linux/init.h> 23 #include <linux/init.h>
24 #include <linux/module.h> 24 #include <linux/module.h>
25 #include <linux/crypto.h> 25 #include <linux/crypto.h>
26 #include <linux/zlib.h> 26 #include <linux/zlib.h>
27 #include <linux/vmalloc.h> 27 #include <linux/vmalloc.h>
28 #include <linux/interrupt.h> 28 #include <linux/interrupt.h>
29 #include <linux/mm.h> 29 #include <linux/mm.h>
30 #include <linux/net.h> 30 #include <linux/net.h>
31 #include <crypto/internal/scompress.h> 31 #include <crypto/internal/scompress.h>
32 32
33 #define DEFLATE_DEF_LEVEL Z_DEFA 33 #define DEFLATE_DEF_LEVEL Z_DEFAULT_COMPRESSION
34 #define DEFLATE_DEF_WINBITS 11 34 #define DEFLATE_DEF_WINBITS 11
35 #define DEFLATE_DEF_MEMLEVEL MAX_ME 35 #define DEFLATE_DEF_MEMLEVEL MAX_MEM_LEVEL
36 36
37 struct deflate_ctx { 37 struct deflate_ctx {
38 struct z_stream_s comp_stream; 38 struct z_stream_s comp_stream;
39 struct z_stream_s decomp_stream; 39 struct z_stream_s decomp_stream;
40 }; 40 };
41 41
42 static int deflate_comp_init(struct deflate_ct 42 static int deflate_comp_init(struct deflate_ctx *ctx)
43 { 43 {
44 int ret = 0; 44 int ret = 0;
45 struct z_stream_s *stream = &ctx->comp 45 struct z_stream_s *stream = &ctx->comp_stream;
46 46
47 stream->workspace = vzalloc(zlib_defla 47 stream->workspace = vzalloc(zlib_deflate_workspacesize(
48 -DEFLATE_D 48 -DEFLATE_DEF_WINBITS, MAX_MEM_LEVEL));
49 if (!stream->workspace) { 49 if (!stream->workspace) {
50 ret = -ENOMEM; 50 ret = -ENOMEM;
51 goto out; 51 goto out;
52 } 52 }
53 ret = zlib_deflateInit2(stream, DEFLAT 53 ret = zlib_deflateInit2(stream, DEFLATE_DEF_LEVEL, Z_DEFLATED,
54 -DEFLATE_DEF_W 54 -DEFLATE_DEF_WINBITS, DEFLATE_DEF_MEMLEVEL,
55 Z_DEFAULT_STRA 55 Z_DEFAULT_STRATEGY);
56 if (ret != Z_OK) { 56 if (ret != Z_OK) {
57 ret = -EINVAL; 57 ret = -EINVAL;
58 goto out_free; 58 goto out_free;
59 } 59 }
60 out: 60 out:
61 return ret; 61 return ret;
62 out_free: 62 out_free:
63 vfree(stream->workspace); 63 vfree(stream->workspace);
64 goto out; 64 goto out;
65 } 65 }
66 66
67 static int deflate_decomp_init(struct deflate_ 67 static int deflate_decomp_init(struct deflate_ctx *ctx)
68 { 68 {
69 int ret = 0; 69 int ret = 0;
70 struct z_stream_s *stream = &ctx->deco 70 struct z_stream_s *stream = &ctx->decomp_stream;
71 71
72 stream->workspace = vzalloc(zlib_infla 72 stream->workspace = vzalloc(zlib_inflate_workspacesize());
73 if (!stream->workspace) { 73 if (!stream->workspace) {
74 ret = -ENOMEM; 74 ret = -ENOMEM;
75 goto out; 75 goto out;
76 } 76 }
77 ret = zlib_inflateInit2(stream, -DEFLA 77 ret = zlib_inflateInit2(stream, -DEFLATE_DEF_WINBITS);
78 if (ret != Z_OK) { 78 if (ret != Z_OK) {
79 ret = -EINVAL; 79 ret = -EINVAL;
80 goto out_free; 80 goto out_free;
81 } 81 }
82 out: 82 out:
83 return ret; 83 return ret;
84 out_free: 84 out_free:
85 vfree(stream->workspace); 85 vfree(stream->workspace);
86 goto out; 86 goto out;
87 } 87 }
88 88
89 static void deflate_comp_exit(struct deflate_c 89 static void deflate_comp_exit(struct deflate_ctx *ctx)
90 { 90 {
91 zlib_deflateEnd(&ctx->comp_stream); 91 zlib_deflateEnd(&ctx->comp_stream);
92 vfree(ctx->comp_stream.workspace); 92 vfree(ctx->comp_stream.workspace);
93 } 93 }
94 94
95 static void deflate_decomp_exit(struct deflate 95 static void deflate_decomp_exit(struct deflate_ctx *ctx)
96 { 96 {
97 zlib_inflateEnd(&ctx->decomp_stream); 97 zlib_inflateEnd(&ctx->decomp_stream);
98 vfree(ctx->decomp_stream.workspace); 98 vfree(ctx->decomp_stream.workspace);
99 } 99 }
100 100
101 static int __deflate_init(void *ctx) 101 static int __deflate_init(void *ctx)
102 { 102 {
103 int ret; 103 int ret;
104 104
105 ret = deflate_comp_init(ctx); 105 ret = deflate_comp_init(ctx);
106 if (ret) 106 if (ret)
107 goto out; 107 goto out;
108 ret = deflate_decomp_init(ctx); 108 ret = deflate_decomp_init(ctx);
109 if (ret) 109 if (ret)
110 deflate_comp_exit(ctx); 110 deflate_comp_exit(ctx);
111 out: 111 out:
112 return ret; 112 return ret;
113 } 113 }
114 114
115 static void *deflate_alloc_ctx(struct crypto_s 115 static void *deflate_alloc_ctx(struct crypto_scomp *tfm)
116 { 116 {
117 struct deflate_ctx *ctx; 117 struct deflate_ctx *ctx;
118 int ret; 118 int ret;
119 119
120 ctx = kzalloc(sizeof(*ctx), GFP_KERNEL 120 ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
121 if (!ctx) 121 if (!ctx)
122 return ERR_PTR(-ENOMEM); 122 return ERR_PTR(-ENOMEM);
123 123
124 ret = __deflate_init(ctx); 124 ret = __deflate_init(ctx);
125 if (ret) { 125 if (ret) {
126 kfree(ctx); 126 kfree(ctx);
127 return ERR_PTR(ret); 127 return ERR_PTR(ret);
128 } 128 }
129 129
130 return ctx; 130 return ctx;
131 } 131 }
132 132
133 static int deflate_init(struct crypto_tfm *tfm 133 static int deflate_init(struct crypto_tfm *tfm)
134 { 134 {
135 struct deflate_ctx *ctx = crypto_tfm_c 135 struct deflate_ctx *ctx = crypto_tfm_ctx(tfm);
136 136
137 return __deflate_init(ctx); 137 return __deflate_init(ctx);
138 } 138 }
139 139
140 static void __deflate_exit(void *ctx) 140 static void __deflate_exit(void *ctx)
141 { 141 {
142 deflate_comp_exit(ctx); 142 deflate_comp_exit(ctx);
143 deflate_decomp_exit(ctx); 143 deflate_decomp_exit(ctx);
144 } 144 }
145 145
146 static void deflate_free_ctx(struct crypto_sco 146 static void deflate_free_ctx(struct crypto_scomp *tfm, void *ctx)
147 { 147 {
148 __deflate_exit(ctx); 148 __deflate_exit(ctx);
149 kfree_sensitive(ctx); 149 kfree_sensitive(ctx);
150 } 150 }
151 151
152 static void deflate_exit(struct crypto_tfm *tf 152 static void deflate_exit(struct crypto_tfm *tfm)
153 { 153 {
154 struct deflate_ctx *ctx = crypto_tfm_c 154 struct deflate_ctx *ctx = crypto_tfm_ctx(tfm);
155 155
156 __deflate_exit(ctx); 156 __deflate_exit(ctx);
157 } 157 }
158 158
159 static int __deflate_compress(const u8 *src, u 159 static int __deflate_compress(const u8 *src, unsigned int slen,
160 u8 *dst, unsigne 160 u8 *dst, unsigned int *dlen, void *ctx)
161 { 161 {
162 int ret = 0; 162 int ret = 0;
163 struct deflate_ctx *dctx = ctx; 163 struct deflate_ctx *dctx = ctx;
164 struct z_stream_s *stream = &dctx->com 164 struct z_stream_s *stream = &dctx->comp_stream;
165 165
166 ret = zlib_deflateReset(stream); 166 ret = zlib_deflateReset(stream);
167 if (ret != Z_OK) { 167 if (ret != Z_OK) {
168 ret = -EINVAL; 168 ret = -EINVAL;
169 goto out; 169 goto out;
170 } 170 }
171 171
172 stream->next_in = (u8 *)src; 172 stream->next_in = (u8 *)src;
173 stream->avail_in = slen; 173 stream->avail_in = slen;
174 stream->next_out = (u8 *)dst; 174 stream->next_out = (u8 *)dst;
175 stream->avail_out = *dlen; 175 stream->avail_out = *dlen;
176 176
177 ret = zlib_deflate(stream, Z_FINISH); 177 ret = zlib_deflate(stream, Z_FINISH);
178 if (ret != Z_STREAM_END) { 178 if (ret != Z_STREAM_END) {
179 ret = -EINVAL; 179 ret = -EINVAL;
180 goto out; 180 goto out;
181 } 181 }
182 ret = 0; 182 ret = 0;
183 *dlen = stream->total_out; 183 *dlen = stream->total_out;
184 out: 184 out:
185 return ret; 185 return ret;
186 } 186 }
187 187
188 static int deflate_compress(struct crypto_tfm 188 static int deflate_compress(struct crypto_tfm *tfm, const u8 *src,
189 unsigned int slen, 189 unsigned int slen, u8 *dst, unsigned int *dlen)
190 { 190 {
191 struct deflate_ctx *dctx = crypto_tfm_ 191 struct deflate_ctx *dctx = crypto_tfm_ctx(tfm);
192 192
193 return __deflate_compress(src, slen, d 193 return __deflate_compress(src, slen, dst, dlen, dctx);
194 } 194 }
195 195
196 static int deflate_scompress(struct crypto_sco 196 static int deflate_scompress(struct crypto_scomp *tfm, const u8 *src,
197 unsigned int slen 197 unsigned int slen, u8 *dst, unsigned int *dlen,
198 void *ctx) 198 void *ctx)
199 { 199 {
200 return __deflate_compress(src, slen, d 200 return __deflate_compress(src, slen, dst, dlen, ctx);
201 } 201 }
202 202
203 static int __deflate_decompress(const u8 *src, 203 static int __deflate_decompress(const u8 *src, unsigned int slen,
204 u8 *dst, unsig 204 u8 *dst, unsigned int *dlen, void *ctx)
205 { 205 {
206 206
207 int ret = 0; 207 int ret = 0;
208 struct deflate_ctx *dctx = ctx; 208 struct deflate_ctx *dctx = ctx;
209 struct z_stream_s *stream = &dctx->dec 209 struct z_stream_s *stream = &dctx->decomp_stream;
210 210
211 ret = zlib_inflateReset(stream); 211 ret = zlib_inflateReset(stream);
212 if (ret != Z_OK) { 212 if (ret != Z_OK) {
213 ret = -EINVAL; 213 ret = -EINVAL;
214 goto out; 214 goto out;
215 } 215 }
216 216
217 stream->next_in = (u8 *)src; 217 stream->next_in = (u8 *)src;
218 stream->avail_in = slen; 218 stream->avail_in = slen;
219 stream->next_out = (u8 *)dst; 219 stream->next_out = (u8 *)dst;
220 stream->avail_out = *dlen; 220 stream->avail_out = *dlen;
221 221
222 ret = zlib_inflate(stream, Z_SYNC_FLUS 222 ret = zlib_inflate(stream, Z_SYNC_FLUSH);
223 /* 223 /*
224 * Work around a bug in zlib, which so 224 * Work around a bug in zlib, which sometimes wants to taste an extra
225 * byte when being used in the (undocu 225 * byte when being used in the (undocumented) raw deflate mode.
226 * (From USAGI). 226 * (From USAGI).
227 */ 227 */
228 if (ret == Z_OK && !stream->avail_in & 228 if (ret == Z_OK && !stream->avail_in && stream->avail_out) {
229 u8 zerostuff = 0; 229 u8 zerostuff = 0;
230 stream->next_in = &zerostuff; 230 stream->next_in = &zerostuff;
231 stream->avail_in = 1; 231 stream->avail_in = 1;
232 ret = zlib_inflate(stream, Z_F 232 ret = zlib_inflate(stream, Z_FINISH);
233 } 233 }
234 if (ret != Z_STREAM_END) { 234 if (ret != Z_STREAM_END) {
235 ret = -EINVAL; 235 ret = -EINVAL;
236 goto out; 236 goto out;
237 } 237 }
238 ret = 0; 238 ret = 0;
239 *dlen = stream->total_out; 239 *dlen = stream->total_out;
240 out: 240 out:
241 return ret; 241 return ret;
242 } 242 }
243 243
244 static int deflate_decompress(struct crypto_tf 244 static int deflate_decompress(struct crypto_tfm *tfm, const u8 *src,
245 unsigned int sle 245 unsigned int slen, u8 *dst, unsigned int *dlen)
246 { 246 {
247 struct deflate_ctx *dctx = crypto_tfm_ 247 struct deflate_ctx *dctx = crypto_tfm_ctx(tfm);
248 248
249 return __deflate_decompress(src, slen, 249 return __deflate_decompress(src, slen, dst, dlen, dctx);
250 } 250 }
251 251
252 static int deflate_sdecompress(struct crypto_s 252 static int deflate_sdecompress(struct crypto_scomp *tfm, const u8 *src,
253 unsigned int sl 253 unsigned int slen, u8 *dst, unsigned int *dlen,
254 void *ctx) 254 void *ctx)
255 { 255 {
256 return __deflate_decompress(src, slen, 256 return __deflate_decompress(src, slen, dst, dlen, ctx);
257 } 257 }
258 258
259 static struct crypto_alg alg = { 259 static struct crypto_alg alg = {
260 .cra_name = "deflate", 260 .cra_name = "deflate",
261 .cra_driver_name = "deflate-gen 261 .cra_driver_name = "deflate-generic",
262 .cra_flags = CRYPTO_ALG_T 262 .cra_flags = CRYPTO_ALG_TYPE_COMPRESS,
263 .cra_ctxsize = sizeof(struc 263 .cra_ctxsize = sizeof(struct deflate_ctx),
264 .cra_module = THIS_MODULE, 264 .cra_module = THIS_MODULE,
265 .cra_init = deflate_init 265 .cra_init = deflate_init,
266 .cra_exit = deflate_exit 266 .cra_exit = deflate_exit,
267 .cra_u = { .compress 267 .cra_u = { .compress = {
268 .coa_compress = deflate_comp 268 .coa_compress = deflate_compress,
269 .coa_decompress = deflate_deco 269 .coa_decompress = deflate_decompress } }
270 }; 270 };
271 271
272 static struct scomp_alg scomp = { 272 static struct scomp_alg scomp = {
273 .alloc_ctx = deflate_allo 273 .alloc_ctx = deflate_alloc_ctx,
274 .free_ctx = deflate_free 274 .free_ctx = deflate_free_ctx,
275 .compress = deflate_scom 275 .compress = deflate_scompress,
276 .decompress = deflate_sdec 276 .decompress = deflate_sdecompress,
277 .base = { 277 .base = {
278 .cra_name = "deflate", 278 .cra_name = "deflate",
279 .cra_driver_name = "deflate-sc 279 .cra_driver_name = "deflate-scomp",
280 .cra_module = THIS_MODULE 280 .cra_module = THIS_MODULE,
281 } 281 }
282 }; 282 };
283 283
284 static int __init deflate_mod_init(void) 284 static int __init deflate_mod_init(void)
285 { 285 {
286 int ret; 286 int ret;
287 287
288 ret = crypto_register_alg(&alg); 288 ret = crypto_register_alg(&alg);
289 if (ret) 289 if (ret)
290 return ret; 290 return ret;
291 291
292 ret = crypto_register_scomp(&scomp); 292 ret = crypto_register_scomp(&scomp);
293 if (ret) { 293 if (ret) {
294 crypto_unregister_alg(&alg); 294 crypto_unregister_alg(&alg);
295 return ret; 295 return ret;
296 } 296 }
297 297
298 return ret; 298 return ret;
299 } 299 }
300 300
301 static void __exit deflate_mod_fini(void) 301 static void __exit deflate_mod_fini(void)
302 { 302 {
303 crypto_unregister_alg(&alg); 303 crypto_unregister_alg(&alg);
304 crypto_unregister_scomp(&scomp); 304 crypto_unregister_scomp(&scomp);
305 } 305 }
306 306
307 subsys_initcall(deflate_mod_init); 307 subsys_initcall(deflate_mod_init);
308 module_exit(deflate_mod_fini); 308 module_exit(deflate_mod_fini);
309 309
310 MODULE_LICENSE("GPL"); 310 MODULE_LICENSE("GPL");
311 MODULE_DESCRIPTION("Deflate Compression Algori 311 MODULE_DESCRIPTION("Deflate Compression Algorithm for IPCOMP");
312 MODULE_AUTHOR("James Morris <jmorris@intercode 312 MODULE_AUTHOR("James Morris <jmorris@intercode.com.au>");
313 MODULE_ALIAS_CRYPTO("deflate"); 313 MODULE_ALIAS_CRYPTO("deflate");
314 MODULE_ALIAS_CRYPTO("deflate-generic"); 314 MODULE_ALIAS_CRYPTO("deflate-generic");
315 315
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