git.oblomov.eu Git - linux-2.6/blob - drivers/crypto/ixp4xx_crypto.c

   1 /*
   2  * Intel IXP4xx NPE-C crypto driver
   3  *
   4  * Copyright (C) 2008 Christian Hohnstaedt <chohnstaedt@innominate.com>
   5  *
   6  * This program is free software; you can redistribute it and/or modify it
   7  * under the terms of version 2 of the GNU General Public License
   8  * as published by the Free Software Foundation.
   9  *
  10  */
  11
  12 #include <linux/platform_device.h>
  13 #include <linux/dma-mapping.h>
  14 #include <linux/dmapool.h>
  15 #include <linux/crypto.h>
  16 #include <linux/kernel.h>
  17 #include <linux/rtnetlink.h>
  18 #include <linux/interrupt.h>
  19 #include <linux/spinlock.h>
  20
  21 #include <crypto/ctr.h>
  22 #include <crypto/des.h>
  23 #include <crypto/aes.h>
  24 #include <crypto/sha.h>
  25 #include <crypto/algapi.h>
  26 #include <crypto/aead.h>
  27 #include <crypto/authenc.h>
  28 #include <crypto/scatterwalk.h>
  29
  30 #include <asm/arch/npe.h>
  31 #include <asm/arch/qmgr.h>
  32
  33 #define MAX_KEYLEN 32
  34
  35 /* hash: cfgword + 2 * digestlen; crypt: keylen + cfgword */
  36 #define NPE_CTX_LEN 80
  37 #define AES_BLOCK128 16
  38
  39 #define NPE_OP_HASH_VERIFY   0x01
  40 #define NPE_OP_CCM_ENABLE    0x04
  41 #define NPE_OP_CRYPT_ENABLE  0x08
  42 #define NPE_OP_HASH_ENABLE   0x10
  43 #define NPE_OP_NOT_IN_PLACE  0x20
  44 #define NPE_OP_HMAC_DISABLE  0x40
  45 #define NPE_OP_CRYPT_ENCRYPT 0x80
  46
  47 #define NPE_OP_CCM_GEN_MIC   0xcc
  48 #define NPE_OP_HASH_GEN_ICV  0x50
  49 #define NPE_OP_ENC_GEN_KEY   0xc9
  50
  51 #define MOD_ECB     0x0000
  52 #define MOD_CTR     0x1000
  53 #define MOD_CBC_ENC 0x2000
  54 #define MOD_CBC_DEC 0x3000
  55 #define MOD_CCM_ENC 0x4000
  56 #define MOD_CCM_DEC 0x5000
  57
  58 #define KEYLEN_128  4
  59 #define KEYLEN_192  6
  60 #define KEYLEN_256  8
  61
  62 #define CIPH_DECR   0x0000
  63 #define CIPH_ENCR   0x0400
  64
  65 #define MOD_DES     0x0000
  66 #define MOD_TDEA2   0x0100
  67 #define MOD_3DES   0x0200
  68 #define MOD_AES     0x0800
  69 #define MOD_AES128  (0x0800 | KEYLEN_128)
  70 #define MOD_AES192  (0x0900 | KEYLEN_192)
  71 #define MOD_AES256  (0x0a00 | KEYLEN_256)
  72
  73 #define MAX_IVLEN   16
  74 #define NPE_ID      2  /* NPE C */
  75 #define NPE_QLEN    16
  76 /* Space for registering when the first
  77  * NPE_QLEN crypt_ctl are busy */
  78 #define NPE_QLEN_TOTAL 64
  79
  80 #define SEND_QID    29
  81 #define RECV_QID    30
  82
  83 #define CTL_FLAG_UNUSED         0x0000
  84 #define CTL_FLAG_USED           0x1000
  85 #define CTL_FLAG_PERFORM_ABLK   0x0001
  86 #define CTL_FLAG_GEN_ICV        0x0002
  87 #define CTL_FLAG_GEN_REVAES     0x0004
  88 #define CTL_FLAG_PERFORM_AEAD   0x0008
  89 #define CTL_FLAG_MASK           0x000f
  90
  91 #define HMAC_IPAD_VALUE   0x36
  92 #define HMAC_OPAD_VALUE   0x5C
  93 #define HMAC_PAD_BLOCKLEN SHA1_BLOCK_SIZE
  94
  95 #define MD5_DIGEST_SIZE   16
  96
  97 struct buffer_desc {
  98         u32 phys_next;
  99         u16 buf_len;
 100         u16 pkt_len;
 101         u32 phys_addr;
 102         u32 __reserved[4];
 103         struct buffer_desc *next;
 104 };
 105
 106 struct crypt_ctl {
 107         u8 mode;                /* NPE_OP_*  operation mode */
 108         u8 init_len;
 109         u16 reserved;
 110         u8 iv[MAX_IVLEN];       /* IV for CBC mode or CTR IV for CTR mode */
 111         u32 icv_rev_aes;        /* icv or rev aes */
 112         u32 src_buf;
 113         u32 dst_buf;
 114         u16 auth_offs;          /* Authentication start offset */
 115         u16 auth_len;           /* Authentication data length */
 116         u16 crypt_offs;         /* Cryption start offset */
 117         u16 crypt_len;          /* Cryption data length */
 118         u32 aadAddr;            /* Additional Auth Data Addr for CCM mode */
 119         u32 crypto_ctx;         /* NPE Crypto Param structure address */
 120
 121         /* Used by Host: 4*4 bytes*/
 122         unsigned ctl_flags;
 123         union {
 124                 struct ablkcipher_request *ablk_req;
 125                 struct aead_request *aead_req;
 126                 struct crypto_tfm *tfm;
 127         } data;
 128         struct buffer_desc *regist_buf;
 129         u8 *regist_ptr;
 130 };
 131
 132 struct ablk_ctx {
 133         struct buffer_desc *src;
 134         struct buffer_desc *dst;
 135         unsigned src_nents;
 136         unsigned dst_nents;
 137 };
 138
 139 struct aead_ctx {
 140         struct buffer_desc *buffer;
 141         unsigned short assoc_nents;
 142         unsigned short src_nents;
 143         struct scatterlist ivlist;
 144         /* used when the hmac is not on one sg entry */
 145         u8 *hmac_virt;
 146         int encrypt;
 147 };
 148
 149 struct ix_hash_algo {
 150         u32 cfgword;
 151         unsigned char *icv;
 152 };
 153
 154 struct ix_sa_dir {
 155         unsigned char *npe_ctx;
 156         dma_addr_t npe_ctx_phys;
 157         int npe_ctx_idx;
 158         u8 npe_mode;
 159 };
 160
 161 struct ixp_ctx {
 162         struct ix_sa_dir encrypt;
 163         struct ix_sa_dir decrypt;
 164         int authkey_len;
 165         u8 authkey[MAX_KEYLEN];
 166         int enckey_len;
 167         u8 enckey[MAX_KEYLEN];
 168         u8 salt[MAX_IVLEN];
 169         u8 nonce[CTR_RFC3686_NONCE_SIZE];
 170         unsigned salted;
 171         atomic_t configuring;
 172         struct completion completion;
 173 };
 174
 175 struct ixp_alg {
 176         struct crypto_alg crypto;
 177         const struct ix_hash_algo *hash;
 178         u32 cfg_enc;
 179         u32 cfg_dec;
 180
 181         int registered;
 182 };
 183
 184 static const struct ix_hash_algo hash_alg_md5 = {
 185         .cfgword        = 0xAA010004,
 186         .icv            = "\x01\x23\x45\x67\x89\xAB\xCD\xEF"
 187                           "\xFE\xDC\xBA\x98\x76\x54\x32\x10",
 188 };
 189 static const struct ix_hash_algo hash_alg_sha1 = {
 190         .cfgword        = 0x00000005,
 191         .icv            = "\x67\x45\x23\x01\xEF\xCD\xAB\x89\x98\xBA"
 192                           "\xDC\xFE\x10\x32\x54\x76\xC3\xD2\xE1\xF0",
 193 };
 194
 195 static struct npe *npe_c;
 196 static struct dma_pool *buffer_pool = NULL;
 197 static struct dma_pool *ctx_pool = NULL;
 198
 199 static struct crypt_ctl *crypt_virt = NULL;
 200 static dma_addr_t crypt_phys;
 201
 202 static int support_aes = 1;
 203
 204 static void dev_release(struct device *dev)
 205 {
 206         return;
 207 }
 208
 209 #define DRIVER_NAME "ixp4xx_crypto"
 210 static struct platform_device pseudo_dev = {
 211         .name = DRIVER_NAME,
 212         .id   = 0,
 213         .num_resources = 0,
 214         .dev  = {
 215                 .coherent_dma_mask = DMA_32BIT_MASK,
 216                 .release = dev_release,
 217         }
 218 };
 219
 220 static struct device *dev = &pseudo_dev.dev;
 221
 222 static inline dma_addr_t crypt_virt2phys(struct crypt_ctl *virt)
 223 {
 224         return crypt_phys + (virt - crypt_virt) * sizeof(struct crypt_ctl);
 225 }
 226
 227 static inline struct crypt_ctl *crypt_phys2virt(dma_addr_t phys)
 228 {
 229         return crypt_virt + (phys - crypt_phys) / sizeof(struct crypt_ctl);
 230 }
 231
 232 static inline u32 cipher_cfg_enc(struct crypto_tfm *tfm)
 233 {
 234         return container_of(tfm->__crt_alg, struct ixp_alg,crypto)->cfg_enc;
 235 }
 236
 237 static inline u32 cipher_cfg_dec(struct crypto_tfm *tfm)
 238 {
 239         return container_of(tfm->__crt_alg, struct ixp_alg,crypto)->cfg_dec;
 240 }
 241
 242 static inline const struct ix_hash_algo *ix_hash(struct crypto_tfm *tfm)
 243 {
 244         return container_of(tfm->__crt_alg, struct ixp_alg, crypto)->hash;
 245 }
 246
 247 static int setup_crypt_desc(void)
 248 {
 249         BUILD_BUG_ON(sizeof(struct crypt_ctl) != 64);
 250         crypt_virt = dma_alloc_coherent(dev,
 251                         NPE_QLEN * sizeof(struct crypt_ctl),
 252                         &crypt_phys, GFP_KERNEL);
 253         if (!crypt_virt)
 254                 return -ENOMEM;
 255         memset(crypt_virt, 0, NPE_QLEN * sizeof(struct crypt_ctl));
 256         return 0;
 257 }
 258
 259 static spinlock_t desc_lock;
 260 static struct crypt_ctl *get_crypt_desc(void)
 261 {
 262         int i;
 263         static int idx = 0;
 264         unsigned long flags;
 265
 266         spin_lock_irqsave(&desc_lock, flags);
 267
 268         if (unlikely(!crypt_virt))
 269                 setup_crypt_desc();
 270         if (unlikely(!crypt_virt)) {
 271                 spin_unlock_irqrestore(&desc_lock, flags);
 272                 return NULL;
 273         }
 274         i = idx;
 275         if (crypt_virt[i].ctl_flags == CTL_FLAG_UNUSED) {
 276                 if (++idx >= NPE_QLEN)
 277                         idx = 0;
 278                 crypt_virt[i].ctl_flags = CTL_FLAG_USED;
 279                 spin_unlock_irqrestore(&desc_lock, flags);
 280                 return crypt_virt +i;
 281         } else {
 282                 spin_unlock_irqrestore(&desc_lock, flags);
 283                 return NULL;
 284         }
 285 }
 286
 287 static spinlock_t emerg_lock;
 288 static struct crypt_ctl *get_crypt_desc_emerg(void)
 289 {
 290         int i;
 291         static int idx = NPE_QLEN;
 292         struct crypt_ctl *desc;
 293         unsigned long flags;
 294
 295         desc = get_crypt_desc();
 296         if (desc)
 297                 return desc;
 298         if (unlikely(!crypt_virt))
 299                 return NULL;
 300
 301         spin_lock_irqsave(&emerg_lock, flags);
 302         i = idx;
 303         if (crypt_virt[i].ctl_flags == CTL_FLAG_UNUSED) {
 304                 if (++idx >= NPE_QLEN_TOTAL)
 305                         idx = NPE_QLEN;
 306                 crypt_virt[i].ctl_flags = CTL_FLAG_USED;
 307                 spin_unlock_irqrestore(&emerg_lock, flags);
 308                 return crypt_virt +i;
 309         } else {
 310                 spin_unlock_irqrestore(&emerg_lock, flags);
 311                 return NULL;
 312         }
 313 }
 314
 315 static void free_buf_chain(struct buffer_desc *buf, u32 phys)
 316 {
 317         while (buf) {
 318                 struct buffer_desc *buf1;
 319                 u32 phys1;
 320
 321                 buf1 = buf->next;
 322                 phys1 = buf->phys_next;
 323                 dma_pool_free(buffer_pool, buf, phys);
 324                 buf = buf1;
 325                 phys = phys1;
 326         }
 327 }
 328
 329 static struct tasklet_struct crypto_done_tasklet;
 330
 331 static void finish_scattered_hmac(struct crypt_ctl *crypt)
 332 {
 333         struct aead_request *req = crypt->data.aead_req;
 334         struct aead_ctx *req_ctx = aead_request_ctx(req);
 335         struct crypto_aead *tfm = crypto_aead_reqtfm(req);
 336         int authsize = crypto_aead_authsize(tfm);
 337         int decryptlen = req->cryptlen - authsize;
 338
 339         if (req_ctx->encrypt) {
 340                 scatterwalk_map_and_copy(req_ctx->hmac_virt,
 341                         req->src, decryptlen, authsize, 1);
 342         }
 343         dma_pool_free(buffer_pool, req_ctx->hmac_virt, crypt->icv_rev_aes);
 344 }
 345
 346 static void one_packet(dma_addr_t phys)
 347 {
 348         struct crypt_ctl *crypt;
 349         struct ixp_ctx *ctx;
 350         int failed;
 351         enum dma_data_direction src_direction = DMA_BIDIRECTIONAL;
 352
 353         failed = phys & 0x1 ? -EBADMSG : 0;
 354         phys &= ~0x3;
 355         crypt = crypt_phys2virt(phys);
 356
 357         switch (crypt->ctl_flags & CTL_FLAG_MASK) {
 358         case CTL_FLAG_PERFORM_AEAD: {
 359                 struct aead_request *req = crypt->data.aead_req;
 360                 struct aead_ctx *req_ctx = aead_request_ctx(req);
 361                 dma_unmap_sg(dev, req->assoc, req_ctx->assoc_nents,
 362                                 DMA_TO_DEVICE);
 363                 dma_unmap_sg(dev, &req_ctx->ivlist, 1, DMA_BIDIRECTIONAL);
 364                 dma_unmap_sg(dev, req->src, req_ctx->src_nents,
 365                                 DMA_BIDIRECTIONAL);
 366
 367                 free_buf_chain(req_ctx->buffer, crypt->src_buf);
 368                 if (req_ctx->hmac_virt) {
 369                         finish_scattered_hmac(crypt);
 370                 }
 371                 req->base.complete(&req->base, failed);
 372                 break;
 373         }
 374         case CTL_FLAG_PERFORM_ABLK: {
 375                 struct ablkcipher_request *req = crypt->data.ablk_req;
 376                 struct ablk_ctx *req_ctx = ablkcipher_request_ctx(req);
 377                 int nents;
 378                 if (req_ctx->dst) {
 379                         nents = req_ctx->dst_nents;
 380                         dma_unmap_sg(dev, req->dst, nents, DMA_FROM_DEVICE);
 381                         free_buf_chain(req_ctx->dst, crypt->dst_buf);
 382                         src_direction = DMA_TO_DEVICE;
 383                 }
 384                 nents = req_ctx->src_nents;
 385                 dma_unmap_sg(dev, req->src, nents, src_direction);
 386                 free_buf_chain(req_ctx->src, crypt->src_buf);
 387                 req->base.complete(&req->base, failed);
 388                 break;
 389         }
 390         case CTL_FLAG_GEN_ICV:
 391                 ctx = crypto_tfm_ctx(crypt->data.tfm);
 392                 dma_pool_free(ctx_pool, crypt->regist_ptr,
 393                                 crypt->regist_buf->phys_addr);
 394                 dma_pool_free(buffer_pool, crypt->regist_buf, crypt->src_buf);
 395                 if (atomic_dec_and_test(&ctx->configuring))
 396                         complete(&ctx->completion);
 397                 break;
 398         case CTL_FLAG_GEN_REVAES:
 399                 ctx = crypto_tfm_ctx(crypt->data.tfm);
 400                 *(u32*)ctx->decrypt.npe_ctx &= cpu_to_be32(~CIPH_ENCR);
 401                 if (atomic_dec_and_test(&ctx->configuring))
 402                         complete(&ctx->completion);
 403                 break;
 404         default:
 405                 BUG();
 406         }
 407         crypt->ctl_flags = CTL_FLAG_UNUSED;
 408 }
 409
 410 static void irqhandler(void *_unused)
 411 {
 412         tasklet_schedule(&crypto_done_tasklet);
 413 }
 414
 415 static void crypto_done_action(unsigned long arg)
 416 {
 417         int i;
 418
 419         for(i=0; i<4; i++) {
 420                 dma_addr_t phys = qmgr_get_entry(RECV_QID);
 421                 if (!phys)
 422                         return;
 423                 one_packet(phys);
 424         }
 425         tasklet_schedule(&crypto_done_tasklet);
 426 }
 427
 428 static int init_ixp_crypto(void)
 429 {
 430         int ret = -ENODEV;
 431
 432         if (! ( ~(*IXP4XX_EXP_CFG2) & (IXP4XX_FEATURE_HASH |
 433                                 IXP4XX_FEATURE_AES | IXP4XX_FEATURE_DES))) {
 434                 printk(KERN_ERR "ixp_crypto: No HW crypto available\n");
 435                 return ret;
 436         }
 437         npe_c = npe_request(NPE_ID);
 438         if (!npe_c)
 439                 return ret;
 440
 441         if (!npe_running(npe_c)) {
 442                 npe_load_firmware(npe_c, npe_name(npe_c), dev);
 443         }
 444
 445         /* buffer_pool will also be used to sometimes store the hmac,
 446          * so assure it is large enough
 447          */
 448         BUILD_BUG_ON(SHA1_DIGEST_SIZE > sizeof(struct buffer_desc));
 449         buffer_pool = dma_pool_create("buffer", dev,
 450                         sizeof(struct buffer_desc), 32, 0);
 451         ret = -ENOMEM;
 452         if (!buffer_pool) {
 453                 goto err;
 454         }
 455         ctx_pool = dma_pool_create("context", dev,
 456                         NPE_CTX_LEN, 16, 0);
 457         if (!ctx_pool) {
 458                 goto err;
 459         }
 460         ret = qmgr_request_queue(SEND_QID, NPE_QLEN_TOTAL, 0, 0);
 461         if (ret)
 462                 goto err;
 463         ret = qmgr_request_queue(RECV_QID, NPE_QLEN, 0, 0);
 464         if (ret) {
 465                 qmgr_release_queue(SEND_QID);
 466                 goto err;
 467         }
 468         qmgr_set_irq(RECV_QID, QUEUE_IRQ_SRC_NOT_EMPTY, irqhandler, NULL);
 469         tasklet_init(&crypto_done_tasklet, crypto_done_action, 0);
 470
 471         qmgr_enable_irq(RECV_QID);
 472         return 0;
 473 err:
 474         if (ctx_pool)
 475                 dma_pool_destroy(ctx_pool);
 476         if (buffer_pool)
 477                 dma_pool_destroy(buffer_pool);
 478         npe_release(npe_c);
 479         return ret;
 480 }
 481
 482 static void release_ixp_crypto(void)
 483 {
 484         qmgr_disable_irq(RECV_QID);
 485         tasklet_kill(&crypto_done_tasklet);
 486
 487         qmgr_release_queue(SEND_QID);
 488         qmgr_release_queue(RECV_QID);
 489
 490         dma_pool_destroy(ctx_pool);
 491         dma_pool_destroy(buffer_pool);
 492
 493         npe_release(npe_c);
 494
 495         if (crypt_virt) {
 496                 dma_free_coherent(dev,
 497                         NPE_QLEN_TOTAL * sizeof( struct crypt_ctl),
 498                         crypt_virt, crypt_phys);
 499         }
 500         return;
 501 }
 502
 503 static void reset_sa_dir(struct ix_sa_dir *dir)
 504 {
 505         memset(dir->npe_ctx, 0, NPE_CTX_LEN);
 506         dir->npe_ctx_idx = 0;
 507         dir->npe_mode = 0;
 508 }
 509
 510 static int init_sa_dir(struct ix_sa_dir *dir)
 511 {
 512         dir->npe_ctx = dma_pool_alloc(ctx_pool, GFP_KERNEL, &dir->npe_ctx_phys);
 513         if (!dir->npe_ctx) {
 514                 return -ENOMEM;
 515         }
 516         reset_sa_dir(dir);
 517         return 0;
 518 }
 519
 520 static void free_sa_dir(struct ix_sa_dir *dir)
 521 {
 522         memset(dir->npe_ctx, 0, NPE_CTX_LEN);
 523         dma_pool_free(ctx_pool, dir->npe_ctx, dir->npe_ctx_phys);
 524 }
 525
 526 static int init_tfm(struct crypto_tfm *tfm)
 527 {
 528         struct ixp_ctx *ctx = crypto_tfm_ctx(tfm);
 529         int ret;
 530
 531         atomic_set(&ctx->configuring, 0);
 532         ret = init_sa_dir(&ctx->encrypt);
 533         if (ret)
 534                 return ret;
 535         ret = init_sa_dir(&ctx->decrypt);
 536         if (ret) {
 537                 free_sa_dir(&ctx->encrypt);
 538         }
 539         return ret;
 540 }
 541
 542 static int init_tfm_ablk(struct crypto_tfm *tfm)
 543 {
 544         tfm->crt_ablkcipher.reqsize = sizeof(struct ablk_ctx);
 545         return init_tfm(tfm);
 546 }
 547
 548 static int init_tfm_aead(struct crypto_tfm *tfm)
 549 {
 550         tfm->crt_aead.reqsize = sizeof(struct aead_ctx);
 551         return init_tfm(tfm);
 552 }
 553
 554 static void exit_tfm(struct crypto_tfm *tfm)
 555 {
 556         struct ixp_ctx *ctx = crypto_tfm_ctx(tfm);
 557         free_sa_dir(&ctx->encrypt);
 558         free_sa_dir(&ctx->decrypt);
 559 }
 560
 561 static int register_chain_var(struct crypto_tfm *tfm, u8 xpad, u32 target,
 562                 int init_len, u32 ctx_addr, const u8 *key, int key_len)
 563 {
 564         struct ixp_ctx *ctx = crypto_tfm_ctx(tfm);
 565         struct crypt_ctl *crypt;
 566         struct buffer_desc *buf;
 567         int i;
 568         u8 *pad;
 569         u32 pad_phys, buf_phys;
 570
 571         BUILD_BUG_ON(NPE_CTX_LEN < HMAC_PAD_BLOCKLEN);
 572         pad = dma_pool_alloc(ctx_pool, GFP_KERNEL, &pad_phys);
 573         if (!pad)
 574                 return -ENOMEM;
 575         buf = dma_pool_alloc(buffer_pool, GFP_KERNEL, &buf_phys);
 576         if (!buf) {
 577                 dma_pool_free(ctx_pool, pad, pad_phys);
 578                 return -ENOMEM;
 579         }
 580         crypt = get_crypt_desc_emerg();
 581         if (!crypt) {
 582                 dma_pool_free(ctx_pool, pad, pad_phys);
 583                 dma_pool_free(buffer_pool, buf, buf_phys);
 584                 return -EAGAIN;
 585         }
 586
 587         memcpy(pad, key, key_len);
 588         memset(pad + key_len, 0, HMAC_PAD_BLOCKLEN - key_len);
 589         for (i = 0; i < HMAC_PAD_BLOCKLEN; i++) {
 590                 pad[i] ^= xpad;
 591         }
 592
 593         crypt->data.tfm = tfm;
 594         crypt->regist_ptr = pad;
 595         crypt->regist_buf = buf;
 596
 597         crypt->auth_offs = 0;
 598         crypt->auth_len = HMAC_PAD_BLOCKLEN;
 599         crypt->crypto_ctx = ctx_addr;
 600         crypt->src_buf = buf_phys;
 601         crypt->icv_rev_aes = target;
 602         crypt->mode = NPE_OP_HASH_GEN_ICV;
 603         crypt->init_len = init_len;
 604         crypt->ctl_flags |= CTL_FLAG_GEN_ICV;
 605
 606         buf->next = 0;
 607         buf->buf_len = HMAC_PAD_BLOCKLEN;
 608         buf->pkt_len = 0;
 609         buf->phys_addr = pad_phys;
 610
 611         atomic_inc(&ctx->configuring);
 612         qmgr_put_entry(SEND_QID, crypt_virt2phys(crypt));
 613         BUG_ON(qmgr_stat_overflow(SEND_QID));
 614         return 0;
 615 }
 616
 617 static int setup_auth(struct crypto_tfm *tfm, int encrypt, unsigned authsize,
 618                 const u8 *key, int key_len, unsigned digest_len)
 619 {
 620         u32 itarget, otarget, npe_ctx_addr;
 621         unsigned char *cinfo;
 622         int init_len, ret = 0;
 623         u32 cfgword;
 624         struct ix_sa_dir *dir;
 625         struct ixp_ctx *ctx = crypto_tfm_ctx(tfm);
 626         const struct ix_hash_algo *algo;
 627
 628         dir = encrypt ? &ctx->encrypt : &ctx->decrypt;
 629         cinfo = dir->npe_ctx + dir->npe_ctx_idx;
 630         algo = ix_hash(tfm);
 631
 632         /* write cfg word to cryptinfo */
 633         cfgword = algo->cfgword | ( authsize << 6); /* (authsize/4) << 8 */
 634         *(u32*)cinfo = cpu_to_be32(cfgword);
 635         cinfo += sizeof(cfgword);
 636
 637         /* write ICV to cryptinfo */
 638         memcpy(cinfo, algo->icv, digest_len);
 639         cinfo += digest_len;
 640
 641         itarget = dir->npe_ctx_phys + dir->npe_ctx_idx
 642                                 + sizeof(algo->cfgword);
 643         otarget = itarget + digest_len;
 644         init_len = cinfo - (dir->npe_ctx + dir->npe_ctx_idx);
 645         npe_ctx_addr = dir->npe_ctx_phys + dir->npe_ctx_idx;
 646
 647         dir->npe_ctx_idx += init_len;
 648         dir->npe_mode |= NPE_OP_HASH_ENABLE;
 649
 650         if (!encrypt)
 651                 dir->npe_mode |= NPE_OP_HASH_VERIFY;
 652
 653         ret = register_chain_var(tfm, HMAC_OPAD_VALUE, otarget,
 654                         init_len, npe_ctx_addr, key, key_len);
 655         if (ret)
 656                 return ret;
 657         return register_chain_var(tfm, HMAC_IPAD_VALUE, itarget,
 658                         init_len, npe_ctx_addr, key, key_len);
 659 }
 660
 661 static int gen_rev_aes_key(struct crypto_tfm *tfm)
 662 {
 663         struct crypt_ctl *crypt;
 664         struct ixp_ctx *ctx = crypto_tfm_ctx(tfm);
 665         struct ix_sa_dir *dir = &ctx->decrypt;
 666
 667         crypt = get_crypt_desc_emerg();
 668         if (!crypt) {
 669                 return -EAGAIN;
 670         }
 671         *(u32*)dir->npe_ctx |= cpu_to_be32(CIPH_ENCR);
 672
 673         crypt->data.tfm = tfm;
 674         crypt->crypt_offs = 0;
 675         crypt->crypt_len = AES_BLOCK128;
 676         crypt->src_buf = 0;
 677         crypt->crypto_ctx = dir->npe_ctx_phys;
 678         crypt->icv_rev_aes = dir->npe_ctx_phys + sizeof(u32);
 679         crypt->mode = NPE_OP_ENC_GEN_KEY;
 680         crypt->init_len = dir->npe_ctx_idx;
 681         crypt->ctl_flags |= CTL_FLAG_GEN_REVAES;
 682
 683         atomic_inc(&ctx->configuring);
 684         qmgr_put_entry(SEND_QID, crypt_virt2phys(crypt));
 685         BUG_ON(qmgr_stat_overflow(SEND_QID));
 686         return 0;
 687 }
 688
 689 static int setup_cipher(struct crypto_tfm *tfm, int encrypt,
 690                 const u8 *key, int key_len)
 691 {
 692         u8 *cinfo;
 693         u32 cipher_cfg;
 694         u32 keylen_cfg = 0;
 695         struct ix_sa_dir *dir;
 696         struct ixp_ctx *ctx = crypto_tfm_ctx(tfm);
 697         u32 *flags = &tfm->crt_flags;
 698
 699         dir = encrypt ? &ctx->encrypt : &ctx->decrypt;
 700         cinfo = dir->npe_ctx;
 701
 702         if (encrypt) {
 703                 cipher_cfg = cipher_cfg_enc(tfm);
 704                 dir->npe_mode |= NPE_OP_CRYPT_ENCRYPT;
 705         } else {
 706                 cipher_cfg = cipher_cfg_dec(tfm);
 707         }
 708         if (cipher_cfg & MOD_AES) {
 709                 switch (key_len) {
 710                         case 16: keylen_cfg = MOD_AES128 | KEYLEN_128; break;
 711                         case 24: keylen_cfg = MOD_AES192 | KEYLEN_192; break;
 712                         case 32: keylen_cfg = MOD_AES256 | KEYLEN_256; break;
 713                         default:
 714                                 *flags |= CRYPTO_TFM_RES_BAD_KEY_LEN;
 715                                 return -EINVAL;
 716                 }
 717                 cipher_cfg |= keylen_cfg;
 718         } else if (cipher_cfg & MOD_3DES) {
 719                 const u32 *K = (const u32 *)key;
 720                 if (unlikely(!((K[0] ^ K[2]) | (K[1] ^ K[3])) ||
 721                              !((K[2] ^ K[4]) | (K[3] ^ K[5]))))
 722                 {
 723                         *flags |= CRYPTO_TFM_RES_BAD_KEY_SCHED;
 724                         return -EINVAL;
 725                 }
 726         } else {
 727                 u32 tmp[DES_EXPKEY_WORDS];
 728                 if (des_ekey(tmp, key) == 0) {
 729                         *flags |= CRYPTO_TFM_RES_WEAK_KEY;
 730                 }
 731         }
 732         /* write cfg word to cryptinfo */
 733         *(u32*)cinfo = cpu_to_be32(cipher_cfg);
 734         cinfo += sizeof(cipher_cfg);
 735
 736         /* write cipher key to cryptinfo */
 737         memcpy(cinfo, key, key_len);
 738         /* NPE wants keylen set to DES3_EDE_KEY_SIZE even for single DES */
 739         if (key_len < DES3_EDE_KEY_SIZE && !(cipher_cfg & MOD_AES)) {
 740                 memset(cinfo + key_len, 0, DES3_EDE_KEY_SIZE -key_len);
 741                 key_len = DES3_EDE_KEY_SIZE;
 742         }
 743         dir->npe_ctx_idx = sizeof(cipher_cfg) + key_len;
 744         dir->npe_mode |= NPE_OP_CRYPT_ENABLE;
 745         if ((cipher_cfg & MOD_AES) && !encrypt) {
 746                 return gen_rev_aes_key(tfm);
 747         }
 748         return 0;
 749 }
 750
 751 static int count_sg(struct scatterlist *sg, int nbytes)
 752 {
 753         int i;
 754         for (i = 0; nbytes > 0; i++, sg = sg_next(sg))
 755                 nbytes -= sg->length;
 756         return i;
 757 }
 758
 759 static struct buffer_desc *chainup_buffers(struct scatterlist *sg,
 760                         unsigned nbytes, struct buffer_desc *buf, gfp_t flags)
 761 {
 762         int nents = 0;
 763
 764         while (nbytes > 0) {
 765                 struct buffer_desc *next_buf;
 766                 u32 next_buf_phys;
 767                 unsigned len = min(nbytes, sg_dma_len(sg));
 768
 769                 nents++;
 770                 nbytes -= len;
 771                 if (!buf->phys_addr) {
 772                         buf->phys_addr = sg_dma_address(sg);
 773                         buf->buf_len = len;
 774                         buf->next = NULL;
 775                         buf->phys_next = 0;
 776                         goto next;
 777                 }
 778                 /* Two consecutive chunks on one page may be handled by the old
 779                  * buffer descriptor, increased by the length of the new one
 780                  */
 781                 if (sg_dma_address(sg) == buf->phys_addr + buf->buf_len) {
 782                         buf->buf_len += len;
 783                         goto next;
 784                 }
 785                 next_buf = dma_pool_alloc(buffer_pool, flags, &next_buf_phys);
 786                 if (!next_buf)
 787                         return NULL;
 788                 buf->next = next_buf;
 789                 buf->phys_next = next_buf_phys;
 790
 791                 buf = next_buf;
 792                 buf->next = NULL;
 793                 buf->phys_next = 0;
 794                 buf->phys_addr = sg_dma_address(sg);
 795                 buf->buf_len = len;
 796 next:
 797                 if (nbytes > 0) {
 798                         sg = sg_next(sg);
 799                 }
 800         }
 801         return buf;
 802 }
 803
 804 static int ablk_setkey(struct crypto_ablkcipher *tfm, const u8 *key,
 805                         unsigned int key_len)
 806 {
 807         struct ixp_ctx *ctx = crypto_ablkcipher_ctx(tfm);
 808         u32 *flags = &tfm->base.crt_flags;
 809         int ret;
 810
 811         init_completion(&ctx->completion);
 812         atomic_inc(&ctx->configuring);
 813
 814         reset_sa_dir(&ctx->encrypt);
 815         reset_sa_dir(&ctx->decrypt);
 816
 817         ctx->encrypt.npe_mode = NPE_OP_HMAC_DISABLE;
 818         ctx->decrypt.npe_mode = NPE_OP_HMAC_DISABLE;
 819
 820         ret = setup_cipher(&tfm->base, 0, key, key_len);
 821         if (ret)
 822                 goto out;
 823         ret = setup_cipher(&tfm->base, 1, key, key_len);
 824         if (ret)
 825                 goto out;
 826
 827         if (*flags & CRYPTO_TFM_RES_WEAK_KEY) {
 828                 if (*flags & CRYPTO_TFM_REQ_WEAK_KEY) {
 829                         ret = -EINVAL;
 830                 } else {
 831                         *flags &= ~CRYPTO_TFM_RES_WEAK_KEY;
 832                 }
 833         }
 834 out:
 835         if (!atomic_dec_and_test(&ctx->configuring))
 836                 wait_for_completion(&ctx->completion);
 837         return ret;
 838 }
 839
 840 static int ablk_rfc3686_setkey(struct crypto_ablkcipher *tfm, const u8 *key,
 841                 unsigned int key_len)
 842 {
 843         struct ixp_ctx *ctx = crypto_ablkcipher_ctx(tfm);
 844
 845         /* the nonce is stored in bytes at end of key */
 846         if (key_len < CTR_RFC3686_NONCE_SIZE)
 847                 return -EINVAL;
 848
 849         memcpy(ctx->nonce, key + (key_len - CTR_RFC3686_NONCE_SIZE),
 850                         CTR_RFC3686_NONCE_SIZE);
 851
 852         key_len -= CTR_RFC3686_NONCE_SIZE;
 853         return ablk_setkey(tfm, key, key_len);
 854 }
 855
 856 static int ablk_perform(struct ablkcipher_request *req, int encrypt)
 857 {
 858         struct crypto_ablkcipher *tfm = crypto_ablkcipher_reqtfm(req);
 859         struct ixp_ctx *ctx = crypto_ablkcipher_ctx(tfm);
 860         unsigned ivsize = crypto_ablkcipher_ivsize(tfm);
 861         int ret = -ENOMEM;
 862         struct ix_sa_dir *dir;
 863         struct crypt_ctl *crypt;
 864         unsigned int nbytes = req->nbytes, nents;
 865         enum dma_data_direction src_direction = DMA_BIDIRECTIONAL;
 866         struct ablk_ctx *req_ctx = ablkcipher_request_ctx(req);
 867         gfp_t flags = req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP ?
 868                                 GFP_KERNEL : GFP_ATOMIC;
 869
 870         if (qmgr_stat_full(SEND_QID))
 871                 return -EAGAIN;
 872         if (atomic_read(&ctx->configuring))
 873                 return -EAGAIN;
 874
 875         dir = encrypt ? &ctx->encrypt : &ctx->decrypt;
 876
 877         crypt = get_crypt_desc();
 878         if (!crypt)
 879                 return ret;
 880
 881         crypt->data.ablk_req = req;
 882         crypt->crypto_ctx = dir->npe_ctx_phys;
 883         crypt->mode = dir->npe_mode;
 884         crypt->init_len = dir->npe_ctx_idx;
 885
 886         crypt->crypt_offs = 0;
 887         crypt->crypt_len = nbytes;
 888
 889         BUG_ON(ivsize && !req->info);
 890         memcpy(crypt->iv, req->info, ivsize);
 891         if (req->src != req->dst) {
 892                 crypt->mode |= NPE_OP_NOT_IN_PLACE;
 893                 nents = count_sg(req->dst, nbytes);
 894                 /* This was never tested by Intel
 895                  * for more than one dst buffer, I think. */
 896                 BUG_ON(nents != 1);
 897                 req_ctx->dst_nents = nents;
 898                 dma_map_sg(dev, req->dst, nents, DMA_FROM_DEVICE);
 899                 req_ctx->dst = dma_pool_alloc(buffer_pool, flags,&crypt->dst_buf);
 900                 if (!req_ctx->dst)
 901                         goto unmap_sg_dest;
 902                 req_ctx->dst->phys_addr = 0;
 903                 if (!chainup_buffers(req->dst, nbytes, req_ctx->dst, flags))
 904                         goto free_buf_dest;
 905                 src_direction = DMA_TO_DEVICE;
 906         } else {
 907                 req_ctx->dst = NULL;
 908                 req_ctx->dst_nents = 0;
 909         }
 910         nents = count_sg(req->src, nbytes);
 911         req_ctx->src_nents = nents;
 912         dma_map_sg(dev, req->src, nents, src_direction);
 913
 914         req_ctx->src = dma_pool_alloc(buffer_pool, flags, &crypt->src_buf);
 915         if (!req_ctx->src)
 916                 goto unmap_sg_src;
 917         req_ctx->src->phys_addr = 0;
 918         if (!chainup_buffers(req->src, nbytes, req_ctx->src, flags))
 919                 goto free_buf_src;
 920
 921         crypt->ctl_flags |= CTL_FLAG_PERFORM_ABLK;
 922         qmgr_put_entry(SEND_QID, crypt_virt2phys(crypt));
 923         BUG_ON(qmgr_stat_overflow(SEND_QID));
 924         return -EINPROGRESS;
 925
 926 free_buf_src:
 927         free_buf_chain(req_ctx->src, crypt->src_buf);
 928 unmap_sg_src:
 929         dma_unmap_sg(dev, req->src, req_ctx->src_nents, src_direction);
 930 free_buf_dest:
 931         if (req->src != req->dst) {
 932                 free_buf_chain(req_ctx->dst, crypt->dst_buf);
 933 unmap_sg_dest:
 934                 dma_unmap_sg(dev, req->src, req_ctx->dst_nents,
 935                         DMA_FROM_DEVICE);
 936         }
 937         crypt->ctl_flags = CTL_FLAG_UNUSED;
 938         return ret;
 939 }
 940
 941 static int ablk_encrypt(struct ablkcipher_request *req)
 942 {
 943         return ablk_perform(req, 1);
 944 }
 945
 946 static int ablk_decrypt(struct ablkcipher_request *req)
 947 {
 948         return ablk_perform(req, 0);
 949 }
 950
 951 static int ablk_rfc3686_crypt(struct ablkcipher_request *req)
 952 {
 953         struct crypto_ablkcipher *tfm = crypto_ablkcipher_reqtfm(req);
 954         struct ixp_ctx *ctx = crypto_ablkcipher_ctx(tfm);
 955         u8 iv[CTR_RFC3686_BLOCK_SIZE];
 956         u8 *info = req->info;
 957         int ret;
 958
 959         /* set up counter block */
 960         memcpy(iv, ctx->nonce, CTR_RFC3686_NONCE_SIZE);
 961         memcpy(iv + CTR_RFC3686_NONCE_SIZE, info, CTR_RFC3686_IV_SIZE);
 962
 963         /* initialize counter portion of counter block */
 964         *(__be32 *)(iv + CTR_RFC3686_NONCE_SIZE + CTR_RFC3686_IV_SIZE) =
 965                 cpu_to_be32(1);
 966
 967         req->info = iv;
 968         ret = ablk_perform(req, 1);
 969         req->info = info;
 970         return ret;
 971 }
 972
 973 static int hmac_inconsistent(struct scatterlist *sg, unsigned start,
 974                 unsigned int nbytes)
 975 {
 976         int offset = 0;
 977
 978         if (!nbytes)
 979                 return 0;
 980
 981         for (;;) {
 982                 if (start < offset + sg->length)
 983                         break;
 984
 985                 offset += sg->length;
 986                 sg = sg_next(sg);
 987         }
 988         return (start + nbytes > offset + sg->length);
 989 }
 990
 991 static int aead_perform(struct aead_request *req, int encrypt,
 992                 int cryptoffset, int eff_cryptlen, u8 *iv)
 993 {
 994         struct crypto_aead *tfm = crypto_aead_reqtfm(req);
 995         struct ixp_ctx *ctx = crypto_aead_ctx(tfm);
 996         unsigned ivsize = crypto_aead_ivsize(tfm);
 997         unsigned authsize = crypto_aead_authsize(tfm);
 998         int ret = -ENOMEM;
 999         struct ix_sa_dir *dir;
1000         struct crypt_ctl *crypt;
1001         unsigned int cryptlen, nents;
1002         struct buffer_desc *buf;
1003         struct aead_ctx *req_ctx = aead_request_ctx(req);
1004         gfp_t flags = req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP ?
1005                                 GFP_KERNEL : GFP_ATOMIC;
1006
1007         if (qmgr_stat_full(SEND_QID))
1008                 return -EAGAIN;
1009         if (atomic_read(&ctx->configuring))
1010                 return -EAGAIN;
1011
1012         if (encrypt) {
1013                 dir = &ctx->encrypt;
1014                 cryptlen = req->cryptlen;
1015         } else {
1016                 dir = &ctx->decrypt;
1017                 /* req->cryptlen includes the authsize when decrypting */
1018                 cryptlen = req->cryptlen -authsize;
1019                 eff_cryptlen -= authsize;
1020         }
1021         crypt = get_crypt_desc();
1022         if (!crypt)
1023                 return ret;
1024
1025         crypt->data.aead_req = req;
1026         crypt->crypto_ctx = dir->npe_ctx_phys;
1027         crypt->mode = dir->npe_mode;
1028         crypt->init_len = dir->npe_ctx_idx;
1029
1030         crypt->crypt_offs = cryptoffset;
1031         crypt->crypt_len = eff_cryptlen;
1032
1033         crypt->auth_offs = 0;
1034         crypt->auth_len = req->assoclen + ivsize + cryptlen;
1035         BUG_ON(ivsize && !req->iv);
1036         memcpy(crypt->iv, req->iv, ivsize);
1037
1038         if (req->src != req->dst) {
1039                 BUG(); /* -ENOTSUP because of my lazyness */
1040         }
1041
1042         req_ctx->buffer = dma_pool_alloc(buffer_pool, flags, &crypt->src_buf);
1043         if (!req_ctx->buffer)
1044                 goto out;
1045         req_ctx->buffer->phys_addr = 0;
1046         /* ASSOC data */
1047         nents = count_sg(req->assoc, req->assoclen);
1048         req_ctx->assoc_nents = nents;
1049         dma_map_sg(dev, req->assoc, nents, DMA_TO_DEVICE);
1050         buf = chainup_buffers(req->assoc, req->assoclen, req_ctx->buffer,flags);
1051         if (!buf)
1052                 goto unmap_sg_assoc;
1053         /* IV */
1054         sg_init_table(&req_ctx->ivlist, 1);
1055         sg_set_buf(&req_ctx->ivlist, iv, ivsize);
1056         dma_map_sg(dev, &req_ctx->ivlist, 1, DMA_BIDIRECTIONAL);
1057         buf = chainup_buffers(&req_ctx->ivlist, ivsize, buf, flags);
1058         if (!buf)
1059                 goto unmap_sg_iv;
1060         if (unlikely(hmac_inconsistent(req->src, cryptlen, authsize))) {
1061                 /* The 12 hmac bytes are scattered,
1062                  * we need to copy them into a safe buffer */
1063                 req_ctx->hmac_virt = dma_pool_alloc(buffer_pool, flags,
1064                                 &crypt->icv_rev_aes);
1065                 if (unlikely(!req_ctx->hmac_virt))
1066                         goto unmap_sg_iv;
1067                 if (!encrypt) {
1068                         scatterwalk_map_and_copy(req_ctx->hmac_virt,
1069                                 req->src, cryptlen, authsize, 0);
1070                 }
1071                 req_ctx->encrypt = encrypt;
1072         } else {
1073                 req_ctx->hmac_virt = NULL;
1074         }
1075         /* Crypt */
1076         nents = count_sg(req->src, cryptlen + authsize);
1077         req_ctx->src_nents = nents;
1078         dma_map_sg(dev, req->src, nents, DMA_BIDIRECTIONAL);
1079         buf = chainup_buffers(req->src, cryptlen + authsize, buf, flags);
1080         if (!buf)
1081                 goto unmap_sg_src;
1082         if (!req_ctx->hmac_virt) {
1083                 crypt->icv_rev_aes = buf->phys_addr + buf->buf_len - authsize;
1084         }
1085         crypt->ctl_flags |= CTL_FLAG_PERFORM_AEAD;
1086         qmgr_put_entry(SEND_QID, crypt_virt2phys(crypt));
1087         BUG_ON(qmgr_stat_overflow(SEND_QID));
1088         return -EINPROGRESS;
1089 unmap_sg_src:
1090         dma_unmap_sg(dev, req->src, req_ctx->src_nents, DMA_BIDIRECTIONAL);
1091         if (req_ctx->hmac_virt) {
1092                 dma_pool_free(buffer_pool, req_ctx->hmac_virt,
1093                                 crypt->icv_rev_aes);
1094         }
1095 unmap_sg_iv:
1096         dma_unmap_sg(dev, &req_ctx->ivlist, 1, DMA_BIDIRECTIONAL);
1097 unmap_sg_assoc:
1098         dma_unmap_sg(dev, req->assoc, req_ctx->assoc_nents, DMA_TO_DEVICE);
1099         free_buf_chain(req_ctx->buffer, crypt->src_buf);
1100 out:
1101         crypt->ctl_flags = CTL_FLAG_UNUSED;
1102         return ret;
1103 }
1104
1105 static int aead_setup(struct crypto_aead *tfm, unsigned int authsize)
1106 {
1107         struct ixp_ctx *ctx = crypto_aead_ctx(tfm);
1108         u32 *flags = &tfm->base.crt_flags;
1109         unsigned digest_len = crypto_aead_alg(tfm)->maxauthsize;
1110         int ret;
1111
1112         if (!ctx->enckey_len && !ctx->authkey_len)
1113                 return 0;
1114         init_completion(&ctx->completion);
1115         atomic_inc(&ctx->configuring);
1116
1117         reset_sa_dir(&ctx->encrypt);
1118         reset_sa_dir(&ctx->decrypt);
1119
1120         ret = setup_cipher(&tfm->base, 0, ctx->enckey, ctx->enckey_len);
1121         if (ret)
1122                 goto out;
1123         ret = setup_cipher(&tfm->base, 1, ctx->enckey, ctx->enckey_len);
1124         if (ret)
1125                 goto out;
1126         ret = setup_auth(&tfm->base, 0, authsize, ctx->authkey,
1127                         ctx->authkey_len, digest_len);
1128         if (ret)
1129                 goto out;
1130         ret = setup_auth(&tfm->base, 1, authsize,  ctx->authkey,
1131                         ctx->authkey_len, digest_len);
1132         if (ret)
1133                 goto out;
1134
1135         if (*flags & CRYPTO_TFM_RES_WEAK_KEY) {
1136                 if (*flags & CRYPTO_TFM_REQ_WEAK_KEY) {
1137                         ret = -EINVAL;
1138                         goto out;
1139                 } else {
1140                         *flags &= ~CRYPTO_TFM_RES_WEAK_KEY;
1141                 }
1142         }
1143 out:
1144         if (!atomic_dec_and_test(&ctx->configuring))
1145                 wait_for_completion(&ctx->completion);
1146         return ret;
1147 }
1148
1149 static int aead_setauthsize(struct crypto_aead *tfm, unsigned int authsize)
1150 {
1151         int max = crypto_aead_alg(tfm)->maxauthsize >> 2;
1152
1153         if ((authsize>>2) < 1 || (authsize>>2) > max || (authsize & 3))
1154                 return -EINVAL;
1155         return aead_setup(tfm, authsize);
1156 }
1157
1158 static int aead_setkey(struct crypto_aead *tfm, const u8 *key,
1159                         unsigned int keylen)
1160 {
1161         struct ixp_ctx *ctx = crypto_aead_ctx(tfm);
1162         struct rtattr *rta = (struct rtattr *)key;
1163         struct crypto_authenc_key_param *param;
1164
1165         if (!RTA_OK(rta, keylen))
1166                 goto badkey;
1167         if (rta->rta_type != CRYPTO_AUTHENC_KEYA_PARAM)
1168                 goto badkey;
1169         if (RTA_PAYLOAD(rta) < sizeof(*param))
1170                 goto badkey;
1171
1172         param = RTA_DATA(rta);
1173         ctx->enckey_len = be32_to_cpu(param->enckeylen);
1174
1175         key += RTA_ALIGN(rta->rta_len);
1176         keylen -= RTA_ALIGN(rta->rta_len);
1177
1178         if (keylen < ctx->enckey_len)
1179                 goto badkey;
1180
1181         ctx->authkey_len = keylen - ctx->enckey_len;
1182         memcpy(ctx->enckey, key + ctx->authkey_len, ctx->enckey_len);
1183         memcpy(ctx->authkey, key, ctx->authkey_len);
1184
1185         return aead_setup(tfm, crypto_aead_authsize(tfm));
1186 badkey:
1187         ctx->enckey_len = 0;
1188         crypto_aead_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
1189         return -EINVAL;
1190 }
1191
1192 static int aead_encrypt(struct aead_request *req)
1193 {
1194         unsigned ivsize = crypto_aead_ivsize(crypto_aead_reqtfm(req));
1195         return aead_perform(req, 1, req->assoclen + ivsize,
1196                         req->cryptlen, req->iv);
1197 }
1198
1199 static int aead_decrypt(struct aead_request *req)
1200 {
1201         unsigned ivsize = crypto_aead_ivsize(crypto_aead_reqtfm(req));
1202         return aead_perform(req, 0, req->assoclen + ivsize,
1203                         req->cryptlen, req->iv);
1204 }
1205
1206 static int aead_givencrypt(struct aead_givcrypt_request *req)
1207 {
1208         struct crypto_aead *tfm = aead_givcrypt_reqtfm(req);
1209         struct ixp_ctx *ctx = crypto_aead_ctx(tfm);
1210         unsigned len, ivsize = crypto_aead_ivsize(tfm);
1211         __be64 seq;
1212
1213         /* copied from eseqiv.c */
1214         if (!ctx->salted) {
1215                 get_random_bytes(ctx->salt, ivsize);
1216                 ctx->salted = 1;
1217         }
1218         memcpy(req->areq.iv, ctx->salt, ivsize);
1219         len = ivsize;
1220         if (ivsize > sizeof(u64)) {
1221                 memset(req->giv, 0, ivsize - sizeof(u64));
1222                 len = sizeof(u64);
1223         }
1224         seq = cpu_to_be64(req->seq);
1225         memcpy(req->giv + ivsize - len, &seq, len);
1226         return aead_perform(&req->areq, 1, req->areq.assoclen,
1227                         req->areq.cryptlen +ivsize, req->giv);
1228 }
1229
1230 static struct ixp_alg ixp4xx_algos[] = {
1231 {
1232         .crypto = {
1233                 .cra_name       = "cbc(des)",
1234                 .cra_blocksize  = DES_BLOCK_SIZE,
1235                 .cra_u          = { .ablkcipher = {
1236                         .min_keysize    = DES_KEY_SIZE,
1237                         .max_keysize    = DES_KEY_SIZE,
1238                         .ivsize         = DES_BLOCK_SIZE,
1239                         .geniv          = "eseqiv",
1240                         }
1241                 }
1242         },
1243         .cfg_enc = CIPH_ENCR | MOD_DES | MOD_CBC_ENC | KEYLEN_192,
1244         .cfg_dec = CIPH_DECR | MOD_DES | MOD_CBC_DEC | KEYLEN_192,
1245
1246 }, {
1247         .crypto = {
1248                 .cra_name       = "ecb(des)",
1249                 .cra_blocksize  = DES_BLOCK_SIZE,
1250                 .cra_u          = { .ablkcipher = {
1251                         .min_keysize    = DES_KEY_SIZE,
1252                         .max_keysize    = DES_KEY_SIZE,
1253                         }
1254                 }
1255         },
1256         .cfg_enc = CIPH_ENCR | MOD_DES | MOD_ECB | KEYLEN_192,
1257         .cfg_dec = CIPH_DECR | MOD_DES | MOD_ECB | KEYLEN_192,
1258 }, {
1259         .crypto = {
1260                 .cra_name       = "cbc(des3_ede)",
1261                 .cra_blocksize  = DES3_EDE_BLOCK_SIZE,
1262                 .cra_u          = { .ablkcipher = {
1263                         .min_keysize    = DES3_EDE_KEY_SIZE,
1264                         .max_keysize    = DES3_EDE_KEY_SIZE,
1265                         .ivsize         = DES3_EDE_BLOCK_SIZE,
1266                         .geniv          = "eseqiv",
1267                         }
1268                 }
1269         },
1270         .cfg_enc = CIPH_ENCR | MOD_3DES | MOD_CBC_ENC | KEYLEN_192,
1271         .cfg_dec = CIPH_DECR | MOD_3DES | MOD_CBC_DEC | KEYLEN_192,
1272 }, {
1273         .crypto = {
1274                 .cra_name       = "ecb(des3_ede)",
1275                 .cra_blocksize  = DES3_EDE_BLOCK_SIZE,
1276                 .cra_u          = { .ablkcipher = {
1277                         .min_keysize    = DES3_EDE_KEY_SIZE,
1278                         .max_keysize    = DES3_EDE_KEY_SIZE,
1279                         }
1280                 }
1281         },
1282         .cfg_enc = CIPH_ENCR | MOD_3DES | MOD_ECB | KEYLEN_192,
1283         .cfg_dec = CIPH_DECR | MOD_3DES | MOD_ECB | KEYLEN_192,
1284 }, {
1285         .crypto = {
1286                 .cra_name       = "cbc(aes)",
1287                 .cra_blocksize  = AES_BLOCK_SIZE,
1288                 .cra_u          = { .ablkcipher = {
1289                         .min_keysize    = AES_MIN_KEY_SIZE,
1290                         .max_keysize    = AES_MAX_KEY_SIZE,
1291                         .ivsize         = AES_BLOCK_SIZE,
1292                         .geniv          = "eseqiv",
1293                         }
1294                 }
1295         },
1296         .cfg_enc = CIPH_ENCR | MOD_AES | MOD_CBC_ENC,
1297         .cfg_dec = CIPH_DECR | MOD_AES | MOD_CBC_DEC,
1298 }, {
1299         .crypto = {
1300                 .cra_name       = "ecb(aes)",
1301                 .cra_blocksize  = AES_BLOCK_SIZE,
1302                 .cra_u          = { .ablkcipher = {
1303                         .min_keysize    = AES_MIN_KEY_SIZE,
1304                         .max_keysize    = AES_MAX_KEY_SIZE,
1305                         }
1306                 }
1307         },
1308         .cfg_enc = CIPH_ENCR | MOD_AES | MOD_ECB,
1309         .cfg_dec = CIPH_DECR | MOD_AES | MOD_ECB,
1310 }, {
1311         .crypto = {
1312                 .cra_name       = "ctr(aes)",
1313                 .cra_blocksize  = AES_BLOCK_SIZE,
1314                 .cra_u          = { .ablkcipher = {
1315                         .min_keysize    = AES_MIN_KEY_SIZE,
1316                         .max_keysize    = AES_MAX_KEY_SIZE,
1317                         .ivsize         = AES_BLOCK_SIZE,
1318                         .geniv          = "eseqiv",
1319                         }
1320                 }
1321         },
1322         .cfg_enc = CIPH_ENCR | MOD_AES | MOD_CTR,
1323         .cfg_dec = CIPH_ENCR | MOD_AES | MOD_CTR,
1324 }, {
1325         .crypto = {
1326                 .cra_name       = "rfc3686(ctr(aes))",
1327                 .cra_blocksize  = AES_BLOCK_SIZE,
1328                 .cra_u          = { .ablkcipher = {
1329                         .min_keysize    = AES_MIN_KEY_SIZE,
1330                         .max_keysize    = AES_MAX_KEY_SIZE,
1331                         .ivsize         = AES_BLOCK_SIZE,
1332                         .geniv          = "eseqiv",
1333                         .setkey         = ablk_rfc3686_setkey,
1334                         .encrypt        = ablk_rfc3686_crypt,
1335                         .decrypt        = ablk_rfc3686_crypt }
1336                 }
1337         },
1338         .cfg_enc = CIPH_ENCR | MOD_AES | MOD_CTR,
1339         .cfg_dec = CIPH_ENCR | MOD_AES | MOD_CTR,
1340 }, {
1341         .crypto = {
1342                 .cra_name       = "authenc(hmac(md5),cbc(des))",
1343                 .cra_blocksize  = DES_BLOCK_SIZE,
1344                 .cra_u          = { .aead = {
1345                         .ivsize         = DES_BLOCK_SIZE,
1346                         .maxauthsize    = MD5_DIGEST_SIZE,
1347                         }
1348                 }
1349         },
1350         .hash = &hash_alg_md5,
1351         .cfg_enc = CIPH_ENCR | MOD_DES | MOD_CBC_ENC | KEYLEN_192,
1352         .cfg_dec = CIPH_DECR | MOD_DES | MOD_CBC_DEC | KEYLEN_192,
1353 }, {
1354         .crypto = {
1355                 .cra_name       = "authenc(hmac(md5),cbc(des3_ede))",
1356                 .cra_blocksize  = DES3_EDE_BLOCK_SIZE,
1357                 .cra_u          = { .aead = {
1358                         .ivsize         = DES3_EDE_BLOCK_SIZE,
1359                         .maxauthsize    = MD5_DIGEST_SIZE,
1360                         }
1361                 }
1362         },
1363         .hash = &hash_alg_md5,
1364         .cfg_enc = CIPH_ENCR | MOD_3DES | MOD_CBC_ENC | KEYLEN_192,
1365         .cfg_dec = CIPH_DECR | MOD_3DES | MOD_CBC_DEC | KEYLEN_192,
1366 }, {
1367         .crypto = {
1368                 .cra_name       = "authenc(hmac(sha1),cbc(des))",
1369                 .cra_blocksize  = DES_BLOCK_SIZE,
1370                 .cra_u          = { .aead = {
1371                         .ivsize         = DES_BLOCK_SIZE,
1372                         .maxauthsize    = SHA1_DIGEST_SIZE,
1373                         }
1374                 }
1375         },
1376         .hash = &hash_alg_sha1,
1377         .cfg_enc = CIPH_ENCR | MOD_DES | MOD_CBC_ENC | KEYLEN_192,
1378         .cfg_dec = CIPH_DECR | MOD_DES | MOD_CBC_DEC | KEYLEN_192,
1379 }, {
1380         .crypto = {
1381                 .cra_name       = "authenc(hmac(sha1),cbc(des3_ede))",
1382                 .cra_blocksize  = DES3_EDE_BLOCK_SIZE,
1383                 .cra_u          = { .aead = {
1384                         .ivsize         = DES3_EDE_BLOCK_SIZE,
1385                         .maxauthsize    = SHA1_DIGEST_SIZE,
1386                         }
1387                 }
1388         },
1389         .hash = &hash_alg_sha1,
1390         .cfg_enc = CIPH_ENCR | MOD_3DES | MOD_CBC_ENC | KEYLEN_192,
1391         .cfg_dec = CIPH_DECR | MOD_3DES | MOD_CBC_DEC | KEYLEN_192,
1392 }, {
1393         .crypto = {
1394                 .cra_name       = "authenc(hmac(md5),cbc(aes))",
1395                 .cra_blocksize  = AES_BLOCK_SIZE,
1396                 .cra_u          = { .aead = {
1397                         .ivsize         = AES_BLOCK_SIZE,
1398                         .maxauthsize    = MD5_DIGEST_SIZE,
1399                         }
1400                 }
1401         },
1402         .hash = &hash_alg_md5,
1403         .cfg_enc = CIPH_ENCR | MOD_AES | MOD_CBC_ENC,
1404         .cfg_dec = CIPH_DECR | MOD_AES | MOD_CBC_DEC,
1405 }, {
1406         .crypto = {
1407                 .cra_name       = "authenc(hmac(sha1),cbc(aes))",
1408                 .cra_blocksize  = AES_BLOCK_SIZE,
1409                 .cra_u          = { .aead = {
1410                         .ivsize         = AES_BLOCK_SIZE,
1411                         .maxauthsize    = SHA1_DIGEST_SIZE,
1412                         }
1413                 }
1414         },
1415         .hash = &hash_alg_sha1,
1416         .cfg_enc = CIPH_ENCR | MOD_AES | MOD_CBC_ENC,
1417         .cfg_dec = CIPH_DECR | MOD_AES | MOD_CBC_DEC,
1418 } };
1419
1420 #define IXP_POSTFIX "-ixp4xx"
1421 static int __init ixp_module_init(void)
1422 {
1423         int num = ARRAY_SIZE(ixp4xx_algos);
1424         int i,err ;
1425
1426         if (platform_device_register(&pseudo_dev))
1427                 return -ENODEV;
1428
1429         spin_lock_init(&desc_lock);
1430         spin_lock_init(&emerg_lock);
1431
1432         err = init_ixp_crypto();
1433         if (err) {
1434                 platform_device_unregister(&pseudo_dev);
1435                 return err;
1436         }
1437         for (i=0; i< num; i++) {
1438                 struct crypto_alg *cra = &ixp4xx_algos[i].crypto;
1439
1440                 if (snprintf(cra->cra_driver_name, CRYPTO_MAX_ALG_NAME,
1441                         "%s"IXP_POSTFIX, cra->cra_name) >=
1442                         CRYPTO_MAX_ALG_NAME)
1443                 {
1444                         continue;
1445                 }
1446                 if (!support_aes && (ixp4xx_algos[i].cfg_enc & MOD_AES)) {
1447                         continue;
1448                 }
1449                 if (!ixp4xx_algos[i].hash) {
1450                         /* block ciphers */
1451                         cra->cra_type = &crypto_ablkcipher_type;
1452                         cra->cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER |
1453                                          CRYPTO_ALG_ASYNC;
1454                         if (!cra->cra_ablkcipher.setkey)
1455                                 cra->cra_ablkcipher.setkey = ablk_setkey;
1456                         if (!cra->cra_ablkcipher.encrypt)
1457                                 cra->cra_ablkcipher.encrypt = ablk_encrypt;
1458                         if (!cra->cra_ablkcipher.decrypt)
1459                                 cra->cra_ablkcipher.decrypt = ablk_decrypt;
1460                         cra->cra_init = init_tfm_ablk;
1461                 } else {
1462                         /* authenc */
1463                         cra->cra_type = &crypto_aead_type;
1464                         cra->cra_flags = CRYPTO_ALG_TYPE_AEAD |
1465                                          CRYPTO_ALG_ASYNC;
1466                         cra->cra_aead.setkey = aead_setkey;
1467                         cra->cra_aead.setauthsize = aead_setauthsize;
1468                         cra->cra_aead.encrypt = aead_encrypt;
1469                         cra->cra_aead.decrypt = aead_decrypt;
1470                         cra->cra_aead.givencrypt = aead_givencrypt;
1471                         cra->cra_init = init_tfm_aead;
1472                 }
1473                 cra->cra_ctxsize = sizeof(struct ixp_ctx);
1474                 cra->cra_module = THIS_MODULE;
1475                 cra->cra_alignmask = 3;
1476                 cra->cra_priority = 300;
1477                 cra->cra_exit = exit_tfm;
1478                 if (crypto_register_alg(cra))
1479                         printk(KERN_ERR "Failed to register '%s'\n",
1480                                 cra->cra_name);
1481                 else
1482                         ixp4xx_algos[i].registered = 1;
1483         }
1484         return 0;
1485 }
1486
1487 static void __exit ixp_module_exit(void)
1488 {
1489         int num = ARRAY_SIZE(ixp4xx_algos);
1490         int i;
1491
1492         for (i=0; i< num; i++) {
1493                 if (ixp4xx_algos[i].registered)
1494                         crypto_unregister_alg(&ixp4xx_algos[i].crypto);
1495         }
1496         release_ixp_crypto();
1497         platform_device_unregister(&pseudo_dev);
1498 }
1499
1500 module_init(ixp_module_init);
1501 module_exit(ixp_module_exit);
1502
1503 MODULE_LICENSE("GPL");
1504 MODULE_AUTHOR("Christian Hohnstaedt <chohnstaedt@innominate.com>");
1505 MODULE_DESCRIPTION("IXP4xx hardware crypto");
1506