drivers/crypto/bcm/cipher.h

   1 /*
   2  * Copyright 2016 Broadcom
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License, version 2, as
   6  * published by the Free Software Foundation (the "GPL").
   7  *
   8  * This program is distributed in the hope that it will be useful, but
   9  * WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  11  * General Public License version 2 (GPLv2) for more details.
  12  *
  13  * You should have received a copy of the GNU General Public License
  14  * version 2 (GPLv2) along with this source code.
  15  */
  16
  17 #ifndef _CIPHER_H
  18 #define _CIPHER_H
  19
  20 #include <linux/atomic.h>
  21 #include <linux/mailbox/brcm-message.h>
  22 #include <linux/mailbox_client.h>
  23 #include <crypto/aes.h>
  24 #include <crypto/internal/hash.h>
  25 #include <crypto/aead.h>
  26 #include <crypto/gcm.h>
  27 #include <crypto/sha.h>
  28 #include <crypto/sha3.h>
  29
  30 #include "spu.h"
  31 #include "spum.h"
  32 #include "spu2.h"
  33
  34 /* Driver supports up to MAX_SPUS SPU blocks */
  35 #define MAX_SPUS 16
  36
  37 #define ARC4_MIN_KEY_SIZE   1
  38 #define ARC4_MAX_KEY_SIZE   256
  39 #define ARC4_BLOCK_SIZE     1
  40 #define ARC4_STATE_SIZE     4
  41
  42 #define CCM_AES_IV_SIZE    16
  43 #define CCM_ESP_IV_SIZE     8
  44 #define RFC4543_ICV_SIZE   16
  45
  46 #define MAX_KEY_SIZE    ARC4_MAX_KEY_SIZE
  47 #define MAX_IV_SIZE     AES_BLOCK_SIZE
  48 #define MAX_DIGEST_SIZE SHA3_512_DIGEST_SIZE
  49 #define MAX_ASSOC_SIZE  512
  50
  51 /* size of salt value for AES-GCM-ESP and AES-CCM-ESP */
  52 #define GCM_ESP_SALT_SIZE   4
  53 #define CCM_ESP_SALT_SIZE   3
  54 #define MAX_SALT_SIZE       GCM_ESP_SALT_SIZE
  55 #define GCM_ESP_SALT_OFFSET 0
  56 #define CCM_ESP_SALT_OFFSET 1
  57
  58 #define GCM_ESP_DIGESTSIZE 16
  59
  60 #define MAX_HASH_BLOCK_SIZE SHA512_BLOCK_SIZE
  61
  62 /*
  63  * Maximum number of bytes from a non-final hash request that can be deferred
  64  * until more data is available. With new crypto API framework, this
  65  * can be no more than one block of data.
  66  */
  67 #define HASH_CARRY_MAX  MAX_HASH_BLOCK_SIZE
  68
  69 /* Force at least 4-byte alignment of all SPU message fields */
  70 #define SPU_MSG_ALIGN  4
  71
  72 /* Number of times to resend mailbox message if mb queue is full */
  73 #define SPU_MB_RETRY_MAX  1000
  74
  75 /* op_counts[] indexes */
  76 enum op_type {
  77         SPU_OP_CIPHER,
  78         SPU_OP_HASH,
  79         SPU_OP_HMAC,
  80         SPU_OP_AEAD,
  81         SPU_OP_NUM
  82 };
  83
  84 enum spu_spu_type {
  85         SPU_TYPE_SPUM,
  86         SPU_TYPE_SPU2,
  87 };
  88
  89 /*
  90  * SPUM_NS2 and SPUM_NSP are the SPU-M block on Northstar 2 and Northstar Plus,
  91  * respectively.
  92  */
  93 enum spu_spu_subtype {
  94         SPU_SUBTYPE_SPUM_NS2,
  95         SPU_SUBTYPE_SPUM_NSP,
  96         SPU_SUBTYPE_SPU2_V1,
  97         SPU_SUBTYPE_SPU2_V2
  98 };
  99
 100 struct spu_type_subtype {
 101         enum spu_spu_type type;
 102         enum spu_spu_subtype subtype;
 103 };
 104
 105 struct cipher_op {
 106         enum spu_cipher_alg alg;
 107         enum spu_cipher_mode mode;
 108 };
 109
 110 struct auth_op {
 111         enum hash_alg alg;
 112         enum hash_mode mode;
 113 };
 114
 115 struct iproc_alg_s {
 116         u32 type;
 117         union {
 118                 struct crypto_alg crypto;
 119                 struct ahash_alg hash;
 120                 struct aead_alg aead;
 121         } alg;
 122         struct cipher_op cipher_info;
 123         struct auth_op auth_info;
 124         bool auth_first;
 125         bool registered;
 126 };
 127
 128 /*
 129  * Buffers for a SPU request/reply message pair. All part of one structure to
 130  * allow a single alloc per request.
 131  */
 132 struct spu_msg_buf {
 133         /* Request message fragments */
 134
 135         /*
 136          * SPU request message header. For SPU-M, holds MH, EMH, SCTX, BDESC,
 137          * and BD header. For SPU2, holds FMD, OMD.
 138          */
 139         u8 bcm_spu_req_hdr[ALIGN(SPU2_HEADER_ALLOC_LEN, SPU_MSG_ALIGN)];
 140
 141         /* IV or counter. Size to include salt. Also used for XTS tweek. */
 142         u8 iv_ctr[ALIGN(2 * AES_BLOCK_SIZE, SPU_MSG_ALIGN)];
 143
 144         /* Hash digest. request and response. */
 145         u8 digest[ALIGN(MAX_DIGEST_SIZE, SPU_MSG_ALIGN)];
 146
 147         /* SPU request message padding */
 148         u8 spu_req_pad[ALIGN(SPU_PAD_LEN_MAX, SPU_MSG_ALIGN)];
 149
 150         /* SPU-M request message STATUS field */
 151         u8 tx_stat[ALIGN(SPU_TX_STATUS_LEN, SPU_MSG_ALIGN)];
 152
 153         /* Response message fragments */
 154
 155         /* SPU response message header */
 156         u8 spu_resp_hdr[ALIGN(SPU2_HEADER_ALLOC_LEN, SPU_MSG_ALIGN)];
 157
 158         /* SPU response message STATUS field padding */
 159         u8 rx_stat_pad[ALIGN(SPU_STAT_PAD_MAX, SPU_MSG_ALIGN)];
 160
 161         /* SPU response message STATUS field */
 162         u8 rx_stat[ALIGN(SPU_RX_STATUS_LEN, SPU_MSG_ALIGN)];
 163
 164         union {
 165                 /* Buffers only used for ablkcipher */
 166                 struct {
 167                         /*
 168                          * Field used for either SUPDT when RC4 is used
 169                          * -OR- tweak value when XTS/AES is used
 170                          */
 171                         u8 supdt_tweak[ALIGN(SPU_SUPDT_LEN, SPU_MSG_ALIGN)];
 172                 } c;
 173
 174                 /* Buffers only used for aead */
 175                 struct {
 176                         /* SPU response pad for GCM data */
 177                         u8 gcmpad[ALIGN(AES_BLOCK_SIZE, SPU_MSG_ALIGN)];
 178
 179                         /* SPU request msg padding for GCM AAD */
 180                         u8 req_aad_pad[ALIGN(SPU_PAD_LEN_MAX, SPU_MSG_ALIGN)];
 181
 182                         /* SPU response data to be discarded */
 183                         u8 resp_aad[ALIGN(MAX_ASSOC_SIZE + MAX_IV_SIZE,
 184                                           SPU_MSG_ALIGN)];
 185                 } a;
 186         };
 187 };
 188
 189 struct iproc_ctx_s {
 190         u8 enckey[MAX_KEY_SIZE + ARC4_STATE_SIZE];
 191         unsigned int enckeylen;
 192
 193         u8 authkey[MAX_KEY_SIZE + ARC4_STATE_SIZE];
 194         unsigned int authkeylen;
 195
 196         u8 salt[MAX_SALT_SIZE];
 197         unsigned int salt_len;
 198         unsigned int salt_offset;
 199         u8 iv[MAX_IV_SIZE];
 200
 201         unsigned int digestsize;
 202
 203         struct iproc_alg_s *alg;
 204         bool is_esp;
 205
 206         struct cipher_op cipher;
 207         enum spu_cipher_type cipher_type;
 208
 209         struct auth_op auth;
 210         bool auth_first;
 211
 212         /*
 213          * The maximum length in bytes of the payload in a SPU message for this
 214          * context. For SPU-M, the payload is the combination of AAD and data.
 215          * For SPU2, the payload is just data. A value of SPU_MAX_PAYLOAD_INF
 216          * indicates that there is no limit to the length of the SPU message
 217          * payload.
 218          */
 219         unsigned int max_payload;
 220
 221         struct crypto_aead *fallback_cipher;
 222
 223         /* auth_type is determined during processing of request */
 224
 225         u8 ipad[MAX_HASH_BLOCK_SIZE];
 226         u8 opad[MAX_HASH_BLOCK_SIZE];
 227
 228         /*
 229          * Buffer to hold SPU message header template. Template is created at
 230          * setkey time for ablkcipher requests, since most of the fields in the
 231          * header are known at that time. At request time, just fill in a few
 232          * missing pieces related to length of data in the request and IVs, etc.
 233          */
 234         u8 bcm_spu_req_hdr[ALIGN(SPU2_HEADER_ALLOC_LEN, SPU_MSG_ALIGN)];
 235
 236         /* Length of SPU request header */
 237         u16 spu_req_hdr_len;
 238
 239         /* Expected length of SPU response header */
 240         u16 spu_resp_hdr_len;
 241
 242         /*
 243          * shash descriptor - needed to perform incremental hashing in
 244          * in software, when hw doesn't support it.
 245          */
 246         struct shash_desc *shash;
 247
 248         bool is_rfc4543;        /* RFC 4543 style of GMAC */
 249 };
 250
 251 /* state from iproc_reqctx_s necessary for hash state export/import */
 252 struct spu_hash_export_s {
 253         unsigned int total_todo;
 254         unsigned int total_sent;
 255         u8 hash_carry[HASH_CARRY_MAX];
 256         unsigned int hash_carry_len;
 257         u8 incr_hash[MAX_DIGEST_SIZE];
 258         bool is_sw_hmac;
 259 };
 260
 261 struct iproc_reqctx_s {
 262         /* general context */
 263         struct crypto_async_request *parent;
 264
 265         /* only valid after enqueue() */
 266         struct iproc_ctx_s *ctx;
 267
 268         u8 chan_idx;   /* Mailbox channel to be used to submit this request */
 269
 270         /* total todo, rx'd, and sent for this request */
 271         unsigned int total_todo;
 272         unsigned int total_received;    /* only valid for ablkcipher */
 273         unsigned int total_sent;
 274
 275         /*
 276          * num bytes sent to hw from the src sg in this request. This can differ
 277          * from total_sent for incremental hashing. total_sent includes previous
 278          * init() and update() data. src_sent does not.
 279          */
 280         unsigned int src_sent;
 281
 282         /*
 283          * For AEAD requests, start of associated data. This will typically
 284          * point to the beginning of the src scatterlist from the request,
 285          * since assoc data is at the beginning of the src scatterlist rather
 286          * than in its own sg.
 287          */
 288         struct scatterlist *assoc;
 289
 290         /*
 291          * scatterlist entry and offset to start of data for next chunk. Crypto
 292          * API src scatterlist for AEAD starts with AAD, if present. For first
 293          * chunk, src_sg is sg entry at beginning of input data (after AAD).
 294          * src_skip begins at the offset in that sg entry where data begins.
 295          */
 296         struct scatterlist *src_sg;
 297         int src_nents;          /* Number of src entries with data */
 298         u32 src_skip;           /* bytes of current sg entry already used */
 299
 300         /*
 301          * Same for destination. For AEAD, if there is AAD, output data must
 302          * be written at offset following AAD.
 303          */
 304         struct scatterlist *dst_sg;
 305         int dst_nents;          /* Number of dst entries with data */
 306         u32 dst_skip;           /* bytes of current sg entry already written */
 307
 308         /* Mailbox message used to send this request to PDC driver */
 309         struct brcm_message mb_mssg;
 310
 311         bool bd_suppress;       /* suppress BD field in SPU response? */
 312
 313         /* cipher context */
 314         bool is_encrypt;
 315
 316         /*
 317          * CBC mode: IV.  CTR mode: counter.  Else empty. Used as a DMA
 318          * buffer for AEAD requests. So allocate as DMAable memory. If IV
 319          * concatenated with salt, includes the salt.
 320          */
 321         u8 *iv_ctr;
 322         /* Length of IV or counter, in bytes */
 323         unsigned int iv_ctr_len;
 324
 325         /*
 326          * Hash requests can be of any size, whether initial, update, or final.
 327          * A non-final request must be submitted to the SPU as an integral
 328          * number of blocks. This may leave data at the end of the request
 329          * that is not a full block. Since the request is non-final, it cannot
 330          * be padded. So, we write the remainder to this hash_carry buffer and
 331          * hold it until the next request arrives. The carry data is then
 332          * submitted at the beginning of the data in the next SPU msg.
 333          * hash_carry_len is the number of bytes currently in hash_carry. These
 334          * fields are only used for ahash requests.
 335          */
 336         u8 hash_carry[HASH_CARRY_MAX];
 337         unsigned int hash_carry_len;
 338         unsigned int is_final;  /* is this the final for the hash op? */
 339
 340         /*
 341          * Digest from incremental hash is saved here to include in next hash
 342          * operation. Cannot be stored in req->result for truncated hashes,
 343          * since result may be sized for final digest. Cannot be saved in
 344          * msg_buf because that gets deleted between incremental hash ops
 345          * and is not saved as part of export().
 346          */
 347         u8 incr_hash[MAX_DIGEST_SIZE];
 348
 349         /* hmac context */
 350         bool is_sw_hmac;
 351
 352         /* aead context */
 353         struct crypto_tfm *old_tfm;
 354         crypto_completion_t old_complete;
 355         void *old_data;
 356
 357         gfp_t gfp;
 358
 359         /* Buffers used to build SPU request and response messages */
 360         struct spu_msg_buf msg_buf;
 361 };
 362
 363 /*
 364  * Structure encapsulates a set of function pointers specific to the type of
 365  * SPU hardware running. These functions handling creation and parsing of
 366  * SPU request messages and SPU response messages. Includes hardware-specific
 367  * values read from device tree.
 368  */
 369 struct spu_hw {
 370         void (*spu_dump_msg_hdr)(u8 *buf, unsigned int buf_len);
 371         u32 (*spu_ctx_max_payload)(enum spu_cipher_alg cipher_alg,
 372                                    enum spu_cipher_mode cipher_mode,
 373                                    unsigned int blocksize);
 374         u32 (*spu_payload_length)(u8 *spu_hdr);
 375         u16 (*spu_response_hdr_len)(u16 auth_key_len, u16 enc_key_len,
 376                                     bool is_hash);
 377         u16 (*spu_hash_pad_len)(enum hash_alg hash_alg,
 378                                 enum hash_mode hash_mode, u32 chunksize,
 379                                 u16 hash_block_size);
 380         u32 (*spu_gcm_ccm_pad_len)(enum spu_cipher_mode cipher_mode,
 381                                    unsigned int data_size);
 382         u32 (*spu_assoc_resp_len)(enum spu_cipher_mode cipher_mode,
 383                                   unsigned int assoc_len,
 384                                   unsigned int iv_len, bool is_encrypt);
 385         u8 (*spu_aead_ivlen)(enum spu_cipher_mode cipher_mode,
 386                              u16 iv_len);
 387         enum hash_type (*spu_hash_type)(u32 src_sent);
 388         u32 (*spu_digest_size)(u32 digest_size, enum hash_alg alg,
 389                                enum hash_type);
 390         u32 (*spu_create_request)(u8 *spu_hdr,
 391                                   struct spu_request_opts *req_opts,
 392                                   struct spu_cipher_parms *cipher_parms,
 393                                   struct spu_hash_parms *hash_parms,
 394                                   struct spu_aead_parms *aead_parms,
 395                                   unsigned int data_size);
 396         u16 (*spu_cipher_req_init)(u8 *spu_hdr,
 397                                    struct spu_cipher_parms *cipher_parms);
 398         void (*spu_cipher_req_finish)(u8 *spu_hdr,
 399                                       u16 spu_req_hdr_len,
 400                                       unsigned int is_inbound,
 401                                       struct spu_cipher_parms *cipher_parms,
 402                                       bool update_key,
 403                                       unsigned int data_size);
 404         void (*spu_request_pad)(u8 *pad_start, u32 gcm_padding,
 405                                 u32 hash_pad_len, enum hash_alg auth_alg,
 406                                 enum hash_mode auth_mode,
 407                                 unsigned int total_sent, u32 status_padding);
 408         u8 (*spu_xts_tweak_in_payload)(void);
 409         u8 (*spu_tx_status_len)(void);
 410         u8 (*spu_rx_status_len)(void);
 411         int (*spu_status_process)(u8 *statp);
 412         void (*spu_ccm_update_iv)(unsigned int digestsize,
 413                                   struct spu_cipher_parms *cipher_parms,
 414                                   unsigned int assoclen, unsigned int chunksize,
 415                                   bool is_encrypt, bool is_esp);
 416         u32 (*spu_wordalign_padlen)(u32 data_size);
 417
 418         /* The base virtual address of the SPU hw registers */
 419         void __iomem *reg_vbase[MAX_SPUS];
 420
 421         /* Version of the SPU hardware */
 422         enum spu_spu_type spu_type;
 423
 424         /* Sub-version of the SPU hardware */
 425         enum spu_spu_subtype spu_subtype;
 426
 427         /* The number of SPUs on this platform */
 428         u32 num_spu;
 429
 430         /* The number of SPU channels on this platform */
 431         u32 num_chan;
 432 };
 433
 434 struct device_private {
 435         struct platform_device *pdev;
 436
 437         struct spu_hw spu;
 438
 439         atomic_t session_count; /* number of streams active */
 440         atomic_t stream_count;  /* monotonic counter for streamID's */
 441
 442         /* Length of BCM header. Set to 0 when hw does not expect BCM HEADER. */
 443         u8 bcm_hdr_len;
 444
 445         /* The index of the channel to use for the next crypto request */
 446         atomic_t next_chan;
 447
 448         struct dentry *debugfs_dir;
 449         struct dentry *debugfs_stats;
 450
 451         /* Number of request bytes processed and result bytes returned */
 452         atomic64_t bytes_in;
 453         atomic64_t bytes_out;
 454
 455         /* Number of operations of each type */
 456         atomic_t op_counts[SPU_OP_NUM];
 457
 458         atomic_t cipher_cnt[CIPHER_ALG_LAST][CIPHER_MODE_LAST];
 459         atomic_t hash_cnt[HASH_ALG_LAST];
 460         atomic_t hmac_cnt[HASH_ALG_LAST];
 461         atomic_t aead_cnt[AEAD_TYPE_LAST];
 462
 463         /* Number of calls to setkey() for each operation type */
 464         atomic_t setkey_cnt[SPU_OP_NUM];
 465
 466         /* Number of times request was resubmitted because mb was full */
 467         atomic_t mb_no_spc;
 468
 469         /* Number of mailbox send failures */
 470         atomic_t mb_send_fail;
 471
 472         /* Number of ICV check failures for AEAD messages */
 473         atomic_t bad_icv;
 474
 475         struct mbox_client mcl;
 476
 477         /* Array of mailbox channel pointers, one for each channel */
 478         struct mbox_chan **mbox;
 479 };
 480
 481 extern struct device_private iproc_priv;
 482
 483 #endif