1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Synchronous Compression operations 4 * 5 * Copyright 2015 LG Electronics Inc. 6 * Copyright (c) 2016, Intel Corporation 7 * Author: Giovanni Cabiddu <giovanni.cabiddu@intel.com> 8 */ 9 #include <linux/errno.h> 10 #include <linux/kernel.h> 11 #include <linux/module.h> 12 #include <linux/seq_file.h> 13 #include <linux/slab.h> 14 #include <linux/string.h> 15 #include <linux/crypto.h> 16 #include <linux/compiler.h> 17 #include <linux/vmalloc.h> 18 #include <crypto/algapi.h> 19 #include <linux/cryptouser.h> 20 #include <net/netlink.h> 21 #include <linux/scatterlist.h> 22 #include <crypto/scatterwalk.h> 23 #include <crypto/internal/acompress.h> 24 #include <crypto/internal/scompress.h> 25 #include "internal.h" 26 27 struct scomp_scratch { 28 spinlock_t lock; 29 void *src; 30 void *dst; 31 }; 32 33 static DEFINE_PER_CPU(struct scomp_scratch, scomp_scratch) = { 34 .lock = __SPIN_LOCK_UNLOCKED(scomp_scratch.lock), 35 }; 36 37 static const struct crypto_type crypto_scomp_type; 38 static int scomp_scratch_users; 39 static DEFINE_MUTEX(scomp_lock); 40 41 #ifdef CONFIG_NET 42 static int crypto_scomp_report(struct sk_buff *skb, struct crypto_alg *alg) 43 { 44 struct crypto_report_comp rscomp; 45 46 memset(&rscomp, 0, sizeof(rscomp)); 47 48 strscpy(rscomp.type, "scomp", sizeof(rscomp.type)); 49 50 return nla_put(skb, CRYPTOCFGA_REPORT_COMPRESS, 51 sizeof(rscomp), &rscomp); 52 } 53 #else 54 static int crypto_scomp_report(struct sk_buff *skb, struct crypto_alg *alg) 55 { 56 return -ENOSYS; 57 } 58 #endif 59 60 static void crypto_scomp_show(struct seq_file *m, struct crypto_alg *alg) 61 __maybe_unused; 62 63 static void crypto_scomp_show(struct seq_file *m, struct crypto_alg *alg) 64 { 65 seq_puts(m, "type : scomp\n"); 66 } 67 68 static void crypto_scomp_free_scratches(void) 69 { 70 struct scomp_scratch *scratch; 71 int i; 72 73 for_each_possible_cpu(i) { 74 scratch = per_cpu_ptr(&scomp_scratch, i); 75 76 vfree(scratch->src); 77 vfree(scratch->dst); 78 scratch->src = NULL; 79 scratch->dst = NULL; 80 } 81 } 82 83 static int crypto_scomp_alloc_scratches(void) 84 { 85 struct scomp_scratch *scratch; 86 int i; 87 88 for_each_possible_cpu(i) { 89 void *mem; 90 91 scratch = per_cpu_ptr(&scomp_scratch, i); 92 93 mem = vmalloc_node(SCOMP_SCRATCH_SIZE, cpu_to_node(i)); 94 if (!mem) 95 goto error; 96 scratch->src = mem; 97 mem = vmalloc_node(SCOMP_SCRATCH_SIZE, cpu_to_node(i)); 98 if (!mem) 99 goto error; 100 scratch->dst = mem; 101 } 102 return 0; 103 error: 104 crypto_scomp_free_scratches(); 105 return -ENOMEM; 106 } 107 108 static int crypto_scomp_init_tfm(struct crypto_tfm *tfm) 109 { 110 int ret = 0; 111 112 mutex_lock(&scomp_lock); 113 if (!scomp_scratch_users++) 114 ret = crypto_scomp_alloc_scratches(); 115 mutex_unlock(&scomp_lock); 116 117 return ret; 118 } 119 120 static int scomp_acomp_comp_decomp(struct acomp_req *req, int dir) 121 { 122 struct crypto_acomp *tfm = crypto_acomp_reqtfm(req); 123 void **tfm_ctx = acomp_tfm_ctx(tfm); 124 struct crypto_scomp *scomp = *tfm_ctx; 125 void **ctx = acomp_request_ctx(req); 126 struct scomp_scratch *scratch; 127 int ret; 128 129 if (!req->src || !req->slen || req->slen > SCOMP_SCRATCH_SIZE) 130 return -EINVAL; 131 132 if (req->dst && !req->dlen) 133 return -EINVAL; 134 135 if (!req->dlen || req->dlen > SCOMP_SCRATCH_SIZE) 136 req->dlen = SCOMP_SCRATCH_SIZE; 137 138 scratch = raw_cpu_ptr(&scomp_scratch); 139 spin_lock(&scratch->lock); 140 141 scatterwalk_map_and_copy(scratch->src, req->src, 0, req->slen, 0); 142 if (dir) 143 ret = crypto_scomp_compress(scomp, scratch->src, req->slen, 144 scratch->dst, &req->dlen, *ctx); 145 else 146 ret = crypto_scomp_decompress(scomp, scratch->src, req->slen, 147 scratch->dst, &req->dlen, *ctx); 148 if (!ret) { 149 if (!req->dst) { 150 req->dst = sgl_alloc(req->dlen, GFP_ATOMIC, NULL); 151 if (!req->dst) { 152 ret = -ENOMEM; 153 goto out; 154 } 155 } 156 scatterwalk_map_and_copy(scratch->dst, req->dst, 0, req->dlen, 157 1); 158 } 159 out: 160 spin_unlock(&scratch->lock); 161 return ret; 162 } 163 164 static int scomp_acomp_compress(struct acomp_req *req) 165 { 166 return scomp_acomp_comp_decomp(req, 1); 167 } 168 169 static int scomp_acomp_decompress(struct acomp_req *req) 170 { 171 return scomp_acomp_comp_decomp(req, 0); 172 } 173 174 static void crypto_exit_scomp_ops_async(struct crypto_tfm *tfm) 175 { 176 struct crypto_scomp **ctx = crypto_tfm_ctx(tfm); 177 178 crypto_free_scomp(*ctx); 179 180 mutex_lock(&scomp_lock); 181 if (!--scomp_scratch_users) 182 crypto_scomp_free_scratches(); 183 mutex_unlock(&scomp_lock); 184 } 185 186 int crypto_init_scomp_ops_async(struct crypto_tfm *tfm) 187 { 188 struct crypto_alg *calg = tfm->__crt_alg; 189 struct crypto_acomp *crt = __crypto_acomp_tfm(tfm); 190 struct crypto_scomp **ctx = crypto_tfm_ctx(tfm); 191 struct crypto_scomp *scomp; 192 193 if (!crypto_mod_get(calg)) 194 return -EAGAIN; 195 196 scomp = crypto_create_tfm(calg, &crypto_scomp_type); 197 if (IS_ERR(scomp)) { 198 crypto_mod_put(calg); 199 return PTR_ERR(scomp); 200 } 201 202 *ctx = scomp; 203 tfm->exit = crypto_exit_scomp_ops_async; 204 205 crt->compress = scomp_acomp_compress; 206 crt->decompress = scomp_acomp_decompress; 207 crt->dst_free = sgl_free; 208 crt->reqsize = sizeof(void *); 209 210 return 0; 211 } 212 213 struct acomp_req *crypto_acomp_scomp_alloc_ctx(struct acomp_req *req) 214 { 215 struct crypto_acomp *acomp = crypto_acomp_reqtfm(req); 216 struct crypto_tfm *tfm = crypto_acomp_tfm(acomp); 217 struct crypto_scomp **tfm_ctx = crypto_tfm_ctx(tfm); 218 struct crypto_scomp *scomp = *tfm_ctx; 219 void *ctx; 220 221 ctx = crypto_scomp_alloc_ctx(scomp); 222 if (IS_ERR(ctx)) { 223 kfree(req); 224 return NULL; 225 } 226 227 *req->__ctx = ctx; 228 229 return req; 230 } 231 232 void crypto_acomp_scomp_free_ctx(struct acomp_req *req) 233 { 234 struct crypto_acomp *acomp = crypto_acomp_reqtfm(req); 235 struct crypto_tfm *tfm = crypto_acomp_tfm(acomp); 236 struct crypto_scomp **tfm_ctx = crypto_tfm_ctx(tfm); 237 struct crypto_scomp *scomp = *tfm_ctx; 238 void *ctx = *req->__ctx; 239 240 if (ctx) 241 crypto_scomp_free_ctx(scomp, ctx); 242 } 243 244 static const struct crypto_type crypto_scomp_type = { 245 .extsize = crypto_alg_extsize, 246 .init_tfm = crypto_scomp_init_tfm, 247 #ifdef CONFIG_PROC_FS 248 .show = crypto_scomp_show, 249 #endif 250 .report = crypto_scomp_report, 251 .maskclear = ~CRYPTO_ALG_TYPE_MASK, 252 .maskset = CRYPTO_ALG_TYPE_MASK, 253 .type = CRYPTO_ALG_TYPE_SCOMPRESS, 254 .tfmsize = offsetof(struct crypto_scomp, base), 255 }; 256 257 int crypto_register_scomp(struct scomp_alg *alg) 258 { 259 struct crypto_alg *base = &alg->base; 260 261 base->cra_type = &crypto_scomp_type; 262 base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK; 263 base->cra_flags |= CRYPTO_ALG_TYPE_SCOMPRESS; 264 265 return crypto_register_alg(base); 266 } 267 EXPORT_SYMBOL_GPL(crypto_register_scomp); 268 269 int crypto_unregister_scomp(struct scomp_alg *alg) 270 { 271 return crypto_unregister_alg(&alg->base); 272 } 273 EXPORT_SYMBOL_GPL(crypto_unregister_scomp); 274 275 int crypto_register_scomps(struct scomp_alg *algs, int count) 276 { 277 int i, ret; 278 279 for (i = 0; i < count; i++) { 280 ret = crypto_register_scomp(&algs[i]); 281 if (ret) 282 goto err; 283 } 284 285 return 0; 286 287 err: 288 for (--i; i >= 0; --i) 289 crypto_unregister_scomp(&algs[i]); 290 291 return ret; 292 } 293 EXPORT_SYMBOL_GPL(crypto_register_scomps); 294 295 void crypto_unregister_scomps(struct scomp_alg *algs, int count) 296 { 297 int i; 298 299 for (i = count - 1; i >= 0; --i) 300 crypto_unregister_scomp(&algs[i]); 301 } 302 EXPORT_SYMBOL_GPL(crypto_unregister_scomps); 303 304 MODULE_LICENSE("GPL"); 305 MODULE_DESCRIPTION("Synchronous compression type"); 306