drivers/crypto/chelsio/chtls/chtls_hw.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (c) 2018 Chelsio Communications, Inc.
   4  *
   5  * Written by: Atul Gupta (atul.gupta@chelsio.com)
   6  */
   7
   8 #include <linux/module.h>
   9 #include <linux/list.h>
  10 #include <linux/workqueue.h>
  11 #include <linux/skbuff.h>
  12 #include <linux/timer.h>
  13 #include <linux/notifier.h>
  14 #include <linux/inetdevice.h>
  15 #include <linux/ip.h>
  16 #include <linux/tcp.h>
  17 #include <linux/tls.h>
  18 #include <net/tls.h>
  19
  20 #include "chtls.h"
  21 #include "chtls_cm.h"
  22
  23 static void __set_tcb_field_direct(struct chtls_sock *csk,
  24                                    struct cpl_set_tcb_field *req, u16 word,
  25                                    u64 mask, u64 val, u8 cookie, int no_reply)
  26 {
  27         struct ulptx_idata *sc;
  28
  29         INIT_TP_WR_CPL(req, CPL_SET_TCB_FIELD, csk->tid);
  30         req->wr.wr_mid |= htonl(FW_WR_FLOWID_V(csk->tid));
  31         req->reply_ctrl = htons(NO_REPLY_V(no_reply) |
  32                                 QUEUENO_V(csk->rss_qid));
  33         req->word_cookie = htons(TCB_WORD_V(word) | TCB_COOKIE_V(cookie));
  34         req->mask = cpu_to_be64(mask);
  35         req->val = cpu_to_be64(val);
  36         sc = (struct ulptx_idata *)(req + 1);
  37         sc->cmd_more = htonl(ULPTX_CMD_V(ULP_TX_SC_NOOP));
  38         sc->len = htonl(0);
  39 }
  40
  41 static void __set_tcb_field(struct sock *sk, struct sk_buff *skb, u16 word,
  42                             u64 mask, u64 val, u8 cookie, int no_reply)
  43 {
  44         struct cpl_set_tcb_field *req;
  45         struct chtls_sock *csk;
  46         struct ulptx_idata *sc;
  47         unsigned int wrlen;
  48
  49         wrlen = roundup(sizeof(*req) + sizeof(*sc), 16);
  50         csk = rcu_dereference_sk_user_data(sk);
  51
  52         req = (struct cpl_set_tcb_field *)__skb_put(skb, wrlen);
  53         __set_tcb_field_direct(csk, req, word, mask, val, cookie, no_reply);
  54         set_wr_txq(skb, CPL_PRIORITY_CONTROL, csk->port_id);
  55 }
  56
  57 /*
  58  * Send control message to HW, message go as immediate data and packet
  59  * is freed immediately.
  60  */
  61 static int chtls_set_tcb_field(struct sock *sk, u16 word, u64 mask, u64 val)
  62 {
  63         struct cpl_set_tcb_field *req;
  64         unsigned int credits_needed;
  65         struct chtls_sock *csk;
  66         struct ulptx_idata *sc;
  67         struct sk_buff *skb;
  68         unsigned int wrlen;
  69         int ret;
  70
  71         wrlen = roundup(sizeof(*req) + sizeof(*sc), 16);
  72
  73         skb = alloc_skb(wrlen, GFP_ATOMIC);
  74         if (!skb)
  75                 return -ENOMEM;
  76
  77         credits_needed = DIV_ROUND_UP(wrlen, 16);
  78         csk = rcu_dereference_sk_user_data(sk);
  79
  80         __set_tcb_field(sk, skb, word, mask, val, 0, 1);
  81         skb_set_queue_mapping(skb, (csk->txq_idx << 1) | CPL_PRIORITY_DATA);
  82         csk->wr_credits -= credits_needed;
  83         csk->wr_unacked += credits_needed;
  84         enqueue_wr(csk, skb);
  85         ret = cxgb4_ofld_send(csk->egress_dev, skb);
  86         if (ret < 0)
  87                 kfree_skb(skb);
  88         return ret < 0 ? ret : 0;
  89 }
  90
  91 /*
  92  * Set one of the t_flags bits in the TCB.
  93  */
  94 int chtls_set_tcb_tflag(struct sock *sk, unsigned int bit_pos, int val)
  95 {
  96         return chtls_set_tcb_field(sk, 1, 1ULL << bit_pos,
  97                                    (u64)val << bit_pos);
  98 }
  99
 100 static int chtls_set_tcb_keyid(struct sock *sk, int keyid)
 101 {
 102         return chtls_set_tcb_field(sk, 31, 0xFFFFFFFFULL, keyid);
 103 }
 104
 105 static int chtls_set_tcb_seqno(struct sock *sk)
 106 {
 107         return chtls_set_tcb_field(sk, 28, ~0ULL, 0);
 108 }
 109
 110 static int chtls_set_tcb_quiesce(struct sock *sk, int val)
 111 {
 112         return chtls_set_tcb_field(sk, 1, (1ULL << TF_RX_QUIESCE_S),
 113                                    TF_RX_QUIESCE_V(val));
 114 }
 115
 116 /* TLS Key bitmap processing */
 117 int chtls_init_kmap(struct chtls_dev *cdev, struct cxgb4_lld_info *lldi)
 118 {
 119         unsigned int num_key_ctx, bsize;
 120         int ksize;
 121
 122         num_key_ctx = (lldi->vr->key.size / TLS_KEY_CONTEXT_SZ);
 123         bsize = BITS_TO_LONGS(num_key_ctx);
 124
 125         cdev->kmap.size = num_key_ctx;
 126         cdev->kmap.available = bsize;
 127         ksize = sizeof(*cdev->kmap.addr) * bsize;
 128         cdev->kmap.addr = kvzalloc(ksize, GFP_KERNEL);
 129         if (!cdev->kmap.addr)
 130                 return -ENOMEM;
 131
 132         cdev->kmap.start = lldi->vr->key.start;
 133         spin_lock_init(&cdev->kmap.lock);
 134         return 0;
 135 }
 136
 137 static int get_new_keyid(struct chtls_sock *csk, u32 optname)
 138 {
 139         struct net_device *dev = csk->egress_dev;
 140         struct chtls_dev *cdev = csk->cdev;
 141         struct chtls_hws *hws;
 142         struct adapter *adap;
 143         int keyid;
 144
 145         adap = netdev2adap(dev);
 146         hws = &csk->tlshws;
 147
 148         spin_lock_bh(&cdev->kmap.lock);
 149         keyid = find_first_zero_bit(cdev->kmap.addr, cdev->kmap.size);
 150         if (keyid < cdev->kmap.size) {
 151                 __set_bit(keyid, cdev->kmap.addr);
 152                 if (optname == TLS_RX)
 153                         hws->rxkey = keyid;
 154                 else
 155                         hws->txkey = keyid;
 156                 atomic_inc(&adap->chcr_stats.tls_key);
 157         } else {
 158                 keyid = -1;
 159         }
 160         spin_unlock_bh(&cdev->kmap.lock);
 161         return keyid;
 162 }
 163
 164 void free_tls_keyid(struct sock *sk)
 165 {
 166         struct chtls_sock *csk = rcu_dereference_sk_user_data(sk);
 167         struct net_device *dev = csk->egress_dev;
 168         struct chtls_dev *cdev = csk->cdev;
 169         struct chtls_hws *hws;
 170         struct adapter *adap;
 171
 172         if (!cdev->kmap.addr)
 173                 return;
 174
 175         adap = netdev2adap(dev);
 176         hws = &csk->tlshws;
 177
 178         spin_lock_bh(&cdev->kmap.lock);
 179         if (hws->rxkey >= 0) {
 180                 __clear_bit(hws->rxkey, cdev->kmap.addr);
 181                 atomic_dec(&adap->chcr_stats.tls_key);
 182                 hws->rxkey = -1;
 183         }
 184         if (hws->txkey >= 0) {
 185                 __clear_bit(hws->txkey, cdev->kmap.addr);
 186                 atomic_dec(&adap->chcr_stats.tls_key);
 187                 hws->txkey = -1;
 188         }
 189         spin_unlock_bh(&cdev->kmap.lock);
 190 }
 191
 192 unsigned int keyid_to_addr(int start_addr, int keyid)
 193 {
 194         return (start_addr + (keyid * TLS_KEY_CONTEXT_SZ)) >> 5;
 195 }
 196
 197 static void chtls_rxkey_ivauth(struct _key_ctx *kctx)
 198 {
 199         kctx->iv_to_auth = cpu_to_be64(KEYCTX_TX_WR_IV_V(6ULL) |
 200                                   KEYCTX_TX_WR_AAD_V(1ULL) |
 201                                   KEYCTX_TX_WR_AADST_V(5ULL) |
 202                                   KEYCTX_TX_WR_CIPHER_V(14ULL) |
 203                                   KEYCTX_TX_WR_CIPHERST_V(0ULL) |
 204                                   KEYCTX_TX_WR_AUTH_V(14ULL) |
 205                                   KEYCTX_TX_WR_AUTHST_V(16ULL) |
 206                                   KEYCTX_TX_WR_AUTHIN_V(16ULL));
 207 }
 208
 209 static int chtls_key_info(struct chtls_sock *csk,
 210                           struct _key_ctx *kctx,
 211                           u32 keylen, u32 optname,
 212                           int cipher_type)
 213 {
 214         unsigned char key[AES_MAX_KEY_SIZE];
 215         unsigned char *key_p, *salt;
 216         unsigned char ghash_h[AEAD_H_SIZE];
 217         int ck_size, key_ctx_size, kctx_mackey_size, salt_size;
 218         struct crypto_aes_ctx aes;
 219         int ret;
 220
 221         key_ctx_size = sizeof(struct _key_ctx) +
 222                        roundup(keylen, 16) + AEAD_H_SIZE;
 223
 224         /* GCM mode of AES supports 128 and 256 bit encryption, so
 225          * prepare key context base on GCM cipher type
 226          */
 227         switch (cipher_type) {
 228         case TLS_CIPHER_AES_GCM_128: {
 229                 struct tls12_crypto_info_aes_gcm_128 *gcm_ctx_128 =
 230                         (struct tls12_crypto_info_aes_gcm_128 *)
 231                                         &csk->tlshws.crypto_info;
 232                 memcpy(key, gcm_ctx_128->key, keylen);
 233
 234                 key_p            = gcm_ctx_128->key;
 235                 salt             = gcm_ctx_128->salt;
 236                 ck_size          = CHCR_KEYCTX_CIPHER_KEY_SIZE_128;
 237                 salt_size        = TLS_CIPHER_AES_GCM_128_SALT_SIZE;
 238                 kctx_mackey_size = CHCR_KEYCTX_MAC_KEY_SIZE_128;
 239                 break;
 240         }
 241         case TLS_CIPHER_AES_GCM_256: {
 242                 struct tls12_crypto_info_aes_gcm_256 *gcm_ctx_256 =
 243                         (struct tls12_crypto_info_aes_gcm_256 *)
 244                                         &csk->tlshws.crypto_info;
 245                 memcpy(key, gcm_ctx_256->key, keylen);
 246
 247                 key_p            = gcm_ctx_256->key;
 248                 salt             = gcm_ctx_256->salt;
 249                 ck_size          = CHCR_KEYCTX_CIPHER_KEY_SIZE_256;
 250                 salt_size        = TLS_CIPHER_AES_GCM_256_SALT_SIZE;
 251                 kctx_mackey_size = CHCR_KEYCTX_MAC_KEY_SIZE_256;
 252                 break;
 253         }
 254         default:
 255                 pr_err("GCM: Invalid key length %d\n", keylen);
 256                 return -EINVAL;
 257         }
 258
 259         /* Calculate the H = CIPH(K, 0 repeated 16 times).
 260          * It will go in key context
 261          */
 262         ret = aes_expandkey(&aes, key, keylen);
 263         if (ret)
 264                 return ret;
 265
 266         memset(ghash_h, 0, AEAD_H_SIZE);
 267         aes_encrypt(&aes, ghash_h, ghash_h);
 268         memzero_explicit(&aes, sizeof(aes));
 269         csk->tlshws.keylen = key_ctx_size;
 270
 271         /* Copy the Key context */
 272         if (optname == TLS_RX) {
 273                 int key_ctx;
 274
 275                 key_ctx = ((key_ctx_size >> 4) << 3);
 276                 kctx->ctx_hdr = FILL_KEY_CRX_HDR(ck_size,
 277                                                  kctx_mackey_size,
 278                                                  0, 0, key_ctx);
 279                 chtls_rxkey_ivauth(kctx);
 280         } else {
 281                 kctx->ctx_hdr = FILL_KEY_CTX_HDR(ck_size,
 282                                                  kctx_mackey_size,
 283                                                  0, 0, key_ctx_size >> 4);
 284         }
 285
 286         memcpy(kctx->salt, salt, salt_size);
 287         memcpy(kctx->key, key_p, keylen);
 288         memcpy(kctx->key + keylen, ghash_h, AEAD_H_SIZE);
 289         /* erase key info from driver */
 290         memset(key_p, 0, keylen);
 291
 292         return 0;
 293 }
 294
 295 static void chtls_set_scmd(struct chtls_sock *csk)
 296 {
 297         struct chtls_hws *hws = &csk->tlshws;
 298
 299         hws->scmd.seqno_numivs =
 300                 SCMD_SEQ_NO_CTRL_V(3) |
 301                 SCMD_PROTO_VERSION_V(0) |
 302                 SCMD_ENC_DEC_CTRL_V(0) |
 303                 SCMD_CIPH_AUTH_SEQ_CTRL_V(1) |
 304                 SCMD_CIPH_MODE_V(2) |
 305                 SCMD_AUTH_MODE_V(4) |
 306                 SCMD_HMAC_CTRL_V(0) |
 307                 SCMD_IV_SIZE_V(4) |
 308                 SCMD_NUM_IVS_V(1);
 309
 310         hws->scmd.ivgen_hdrlen =
 311                 SCMD_IV_GEN_CTRL_V(1) |
 312                 SCMD_KEY_CTX_INLINE_V(0) |
 313                 SCMD_TLS_FRAG_ENABLE_V(1);
 314 }
 315
 316 int chtls_setkey(struct chtls_sock *csk, u32 keylen,
 317                  u32 optname, int cipher_type)
 318 {
 319         struct tls_key_req *kwr;
 320         struct chtls_dev *cdev;
 321         struct _key_ctx *kctx;
 322         int wrlen, klen, len;
 323         struct sk_buff *skb;
 324         struct sock *sk;
 325         int keyid;
 326         int kaddr;
 327         int ret;
 328
 329         cdev = csk->cdev;
 330         sk = csk->sk;
 331
 332         klen = roundup((keylen + AEAD_H_SIZE) + sizeof(*kctx), 32);
 333         wrlen = roundup(sizeof(*kwr), 16);
 334         len = klen + wrlen;
 335
 336         /* Flush out-standing data before new key takes effect */
 337         if (optname == TLS_TX) {
 338                 lock_sock(sk);
 339                 if (skb_queue_len(&csk->txq))
 340                         chtls_push_frames(csk, 0);
 341                 release_sock(sk);
 342         }
 343
 344         skb = alloc_skb(len, GFP_KERNEL);
 345         if (!skb)
 346                 return -ENOMEM;
 347
 348         keyid = get_new_keyid(csk, optname);
 349         if (keyid < 0) {
 350                 ret = -ENOSPC;
 351                 goto out_nokey;
 352         }
 353
 354         kaddr = keyid_to_addr(cdev->kmap.start, keyid);
 355         kwr = (struct tls_key_req *)__skb_put_zero(skb, len);
 356         kwr->wr.op_to_compl =
 357                 cpu_to_be32(FW_WR_OP_V(FW_ULPTX_WR) | FW_WR_COMPL_F |
 358                       FW_WR_ATOMIC_V(1U));
 359         kwr->wr.flowid_len16 =
 360                 cpu_to_be32(FW_WR_LEN16_V(DIV_ROUND_UP(len, 16) |
 361                             FW_WR_FLOWID_V(csk->tid)));
 362         kwr->wr.protocol = 0;
 363         kwr->wr.mfs = htons(TLS_MFS);
 364         kwr->wr.reneg_to_write_rx = optname;
 365
 366         /* ulptx command */
 367         kwr->req.cmd = cpu_to_be32(ULPTX_CMD_V(ULP_TX_MEM_WRITE) |
 368                             T5_ULP_MEMIO_ORDER_V(1) |
 369                             T5_ULP_MEMIO_IMM_V(1));
 370         kwr->req.len16 = cpu_to_be32((csk->tid << 8) |
 371                               DIV_ROUND_UP(len - sizeof(kwr->wr), 16));
 372         kwr->req.dlen = cpu_to_be32(ULP_MEMIO_DATA_LEN_V(klen >> 5));
 373         kwr->req.lock_addr = cpu_to_be32(ULP_MEMIO_ADDR_V(kaddr));
 374
 375         /* sub command */
 376         kwr->sc_imm.cmd_more = cpu_to_be32(ULPTX_CMD_V(ULP_TX_SC_IMM));
 377         kwr->sc_imm.len = cpu_to_be32(klen);
 378
 379         lock_sock(sk);
 380         /* key info */
 381         kctx = (struct _key_ctx *)(kwr + 1);
 382         ret = chtls_key_info(csk, kctx, keylen, optname, cipher_type);
 383         if (ret)
 384                 goto out_notcb;
 385
 386         set_wr_txq(skb, CPL_PRIORITY_DATA, csk->tlshws.txqid);
 387         csk->wr_credits -= DIV_ROUND_UP(len, 16);
 388         csk->wr_unacked += DIV_ROUND_UP(len, 16);
 389         enqueue_wr(csk, skb);
 390         cxgb4_ofld_send(csk->egress_dev, skb);
 391
 392         chtls_set_scmd(csk);
 393         /* Clear quiesce for Rx key */
 394         if (optname == TLS_RX) {
 395                 ret = chtls_set_tcb_keyid(sk, keyid);
 396                 if (ret)
 397                         goto out_notcb;
 398                 ret = chtls_set_tcb_field(sk, 0,
 399                                           TCB_ULP_RAW_V(TCB_ULP_RAW_M),
 400                                           TCB_ULP_RAW_V((TF_TLS_KEY_SIZE_V(1) |
 401                                           TF_TLS_CONTROL_V(1) |
 402                                           TF_TLS_ACTIVE_V(1) |
 403                                           TF_TLS_ENABLE_V(1))));
 404                 if (ret)
 405                         goto out_notcb;
 406                 ret = chtls_set_tcb_seqno(sk);
 407                 if (ret)
 408                         goto out_notcb;
 409                 ret = chtls_set_tcb_quiesce(sk, 0);
 410                 if (ret)
 411                         goto out_notcb;
 412                 csk->tlshws.rxkey = keyid;
 413         } else {
 414                 csk->tlshws.tx_seq_no = 0;
 415                 csk->tlshws.txkey = keyid;
 416         }
 417
 418         release_sock(sk);
 419         return ret;
 420 out_notcb:
 421         release_sock(sk);
 422         free_tls_keyid(sk);
 423 out_nokey:
 424         kfree_skb(skb);
 425         return ret;
 426 }