drivers/crypto/chelsio/chtls/chtls.h

   1 /*
   2  * Copyright (c) 2018 Chelsio Communications, Inc.
   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.
   7  */
   8
   9 #ifndef __CHTLS_H__
  10 #define __CHTLS_H__
  11
  12 #include <crypto/aes.h>
  13 #include <crypto/algapi.h>
  14 #include <crypto/hash.h>
  15 #include <crypto/sha.h>
  16 #include <crypto/authenc.h>
  17 #include <crypto/ctr.h>
  18 #include <crypto/gf128mul.h>
  19 #include <crypto/internal/aead.h>
  20 #include <crypto/null.h>
  21 #include <crypto/internal/skcipher.h>
  22 #include <crypto/aead.h>
  23 #include <crypto/scatterwalk.h>
  24 #include <crypto/internal/hash.h>
  25 #include <linux/tls.h>
  26 #include <net/tls.h>
  27
  28 #include "t4fw_api.h"
  29 #include "t4_msg.h"
  30 #include "cxgb4.h"
  31 #include "cxgb4_uld.h"
  32 #include "l2t.h"
  33 #include "chcr_algo.h"
  34 #include "chcr_core.h"
  35 #include "chcr_crypto.h"
  36
  37 #define MAX_IVS_PAGE                    256
  38 #define TLS_KEY_CONTEXT_SZ              64
  39 #define CIPHER_BLOCK_SIZE               16
  40 #define GCM_TAG_SIZE                    16
  41 #define KEY_ON_MEM_SZ                   16
  42 #define AEAD_EXPLICIT_DATA_SIZE         8
  43 #define TLS_HEADER_LENGTH               5
  44 #define SCMD_CIPH_MODE_AES_GCM          2
  45 /* Any MFS size should work and come from openssl */
  46 #define TLS_MFS                         16384
  47
  48 #define RSS_HDR sizeof(struct rss_header)
  49 #define TLS_WR_CPL_LEN \
  50         (sizeof(struct fw_tlstx_data_wr) + sizeof(struct cpl_tx_tls_sfo))
  51
  52 enum {
  53         CHTLS_KEY_CONTEXT_DSGL,
  54         CHTLS_KEY_CONTEXT_IMM,
  55         CHTLS_KEY_CONTEXT_DDR,
  56 };
  57
  58 enum {
  59         CHTLS_LISTEN_START,
  60         CHTLS_LISTEN_STOP,
  61 };
  62
  63 /* Flags for return value of CPL message handlers */
  64 enum {
  65         CPL_RET_BUF_DONE =    1,   /* buffer processing done */
  66         CPL_RET_BAD_MSG =     2,   /* bad CPL message */
  67         CPL_RET_UNKNOWN_TID = 4    /* unexpected unknown TID */
  68 };
  69
  70 #define LISTEN_INFO_HASH_SIZE 32
  71 #define RSPQ_HASH_BITS 5
  72 struct listen_info {
  73         struct listen_info *next;  /* Link to next entry */
  74         struct sock *sk;           /* The listening socket */
  75         unsigned int stid;         /* The server TID */
  76 };
  77
  78 enum {
  79         T4_LISTEN_START_PENDING,
  80         T4_LISTEN_STARTED
  81 };
  82
  83 enum csk_flags {
  84         CSK_CALLBACKS_CHKD,     /* socket callbacks have been sanitized */
  85         CSK_ABORT_REQ_RCVD,     /* received one ABORT_REQ_RSS message */
  86         CSK_TX_MORE_DATA,       /* sending ULP data; don't set SHOVE bit */
  87         CSK_TX_WAIT_IDLE,       /* suspend Tx until in-flight data is ACKed */
  88         CSK_ABORT_SHUTDOWN,     /* shouldn't send more abort requests */
  89         CSK_ABORT_RPL_PENDING,  /* expecting an abort reply */
  90         CSK_CLOSE_CON_REQUESTED,/* we've sent a close_conn_req */
  91         CSK_TX_DATA_SENT,       /* sent a TX_DATA WR on this connection */
  92         CSK_TX_FAILOVER,        /* Tx traffic failing over */
  93         CSK_UPDATE_RCV_WND,     /* Need to update rcv window */
  94         CSK_RST_ABORTED,        /* outgoing RST was aborted */
  95         CSK_TLS_HANDSHK,        /* TLS Handshake */
  96         CSK_CONN_INLINE,        /* Connection on HW */
  97 };
  98
  99 enum chtls_cdev_state {
 100         CHTLS_CDEV_STATE_UP = 1
 101 };
 102
 103 struct listen_ctx {
 104         struct sock *lsk;
 105         struct chtls_dev *cdev;
 106         struct sk_buff_head synq;
 107         u32 state;
 108 };
 109
 110 struct key_map {
 111         unsigned long *addr;
 112         unsigned int start;
 113         unsigned int available;
 114         unsigned int size;
 115         spinlock_t lock; /* lock for key id request from map */
 116 } __packed;
 117
 118 struct tls_scmd {
 119         u32 seqno_numivs;
 120         u32 ivgen_hdrlen;
 121 };
 122
 123 struct chtls_dev {
 124         struct tls_device tlsdev;
 125         struct list_head list;
 126         struct cxgb4_lld_info *lldi;
 127         struct pci_dev *pdev;
 128         struct listen_info *listen_hash_tab[LISTEN_INFO_HASH_SIZE];
 129         spinlock_t listen_lock; /* lock for listen list */
 130         struct net_device **ports;
 131         struct tid_info *tids;
 132         unsigned int pfvf;
 133         const unsigned short *mtus;
 134
 135         struct idr hwtid_idr;
 136         struct idr stid_idr;
 137
 138         spinlock_t idr_lock ____cacheline_aligned_in_smp;
 139
 140         struct net_device *egr_dev[NCHAN * 2];
 141         struct sk_buff *rspq_skb_cache[1 << RSPQ_HASH_BITS];
 142         struct sk_buff *askb;
 143
 144         struct sk_buff_head deferq;
 145         struct work_struct deferq_task;
 146
 147         struct list_head list_node;
 148         struct list_head rcu_node;
 149         struct list_head na_node;
 150         unsigned int send_page_order;
 151         int max_host_sndbuf;
 152         struct key_map kmap;
 153         unsigned int cdev_state;
 154 };
 155
 156 struct chtls_hws {
 157         struct sk_buff_head sk_recv_queue;
 158         u8 txqid;
 159         u8 ofld;
 160         u16 type;
 161         u16 rstate;
 162         u16 keyrpl;
 163         u16 pldlen;
 164         u16 rcvpld;
 165         u16 compute;
 166         u16 expansion;
 167         u16 keylen;
 168         u16 pdus;
 169         u16 adjustlen;
 170         u16 ivsize;
 171         u16 txleft;
 172         u32 mfs;
 173         s32 txkey;
 174         s32 rxkey;
 175         u32 fcplenmax;
 176         u32 copied_seq;
 177         u64 tx_seq_no;
 178         struct tls_scmd scmd;
 179         struct tls12_crypto_info_aes_gcm_128 crypto_info;
 180 };
 181
 182 struct chtls_sock {
 183         struct sock *sk;
 184         struct chtls_dev *cdev;
 185         struct l2t_entry *l2t_entry;    /* pointer to the L2T entry */
 186         struct net_device *egress_dev;  /* TX_CHAN for act open retry */
 187
 188         struct sk_buff_head txq;
 189         struct sk_buff *wr_skb_head;
 190         struct sk_buff *wr_skb_tail;
 191         struct sk_buff *ctrl_skb_cache;
 192         struct sk_buff *txdata_skb_cache; /* abort path messages */
 193         struct kref kref;
 194         unsigned long flags;
 195         u32 opt2;
 196         u32 wr_credits;
 197         u32 wr_unacked;
 198         u32 wr_max_credits;
 199         u32 wr_nondata;
 200         u32 hwtid;               /* TCP Control Block ID */
 201         u32 txq_idx;
 202         u32 rss_qid;
 203         u32 tid;
 204         u32 idr;
 205         u32 mss;
 206         u32 ulp_mode;
 207         u32 tx_chan;
 208         u32 rx_chan;
 209         u32 sndbuf;
 210         u32 txplen_max;
 211         u32 mtu_idx;           /* MTU table index */
 212         u32 smac_idx;
 213         u8 port_id;
 214         u8 tos;
 215         u16 resv2;
 216         u32 delack_mode;
 217         u32 delack_seq;
 218
 219         void *passive_reap_next;        /* placeholder for passive */
 220         struct chtls_hws tlshws;
 221         struct synq {
 222                 struct sk_buff *next;
 223                 struct sk_buff *prev;
 224         } synq;
 225         struct listen_ctx *listen_ctx;
 226 };
 227
 228 struct tls_hdr {
 229         u8  type;
 230         u16 version;
 231         u16 length;
 232 } __packed;
 233
 234 struct tlsrx_cmp_hdr {
 235         u8  type;
 236         u16 version;
 237         u16 length;
 238
 239         u64 tls_seq;
 240         u16 reserved1;
 241         u8  res_to_mac_error;
 242 } __packed;
 243
 244 /* res_to_mac_error fields */
 245 #define TLSRX_HDR_PKT_INT_ERROR_S   4
 246 #define TLSRX_HDR_PKT_INT_ERROR_M   0x1
 247 #define TLSRX_HDR_PKT_INT_ERROR_V(x) \
 248         ((x) << TLSRX_HDR_PKT_INT_ERROR_S)
 249 #define TLSRX_HDR_PKT_INT_ERROR_G(x) \
 250         (((x) >> TLSRX_HDR_PKT_INT_ERROR_S) & TLSRX_HDR_PKT_INT_ERROR_M)
 251 #define TLSRX_HDR_PKT_INT_ERROR_F   TLSRX_HDR_PKT_INT_ERROR_V(1U)
 252
 253 #define TLSRX_HDR_PKT_SPP_ERROR_S        3
 254 #define TLSRX_HDR_PKT_SPP_ERROR_M        0x1
 255 #define TLSRX_HDR_PKT_SPP_ERROR_V(x)     ((x) << TLSRX_HDR_PKT_SPP_ERROR)
 256 #define TLSRX_HDR_PKT_SPP_ERROR_G(x)     \
 257         (((x) >> TLSRX_HDR_PKT_SPP_ERROR_S) & TLSRX_HDR_PKT_SPP_ERROR_M)
 258 #define TLSRX_HDR_PKT_SPP_ERROR_F        TLSRX_HDR_PKT_SPP_ERROR_V(1U)
 259
 260 #define TLSRX_HDR_PKT_CCDX_ERROR_S       2
 261 #define TLSRX_HDR_PKT_CCDX_ERROR_M       0x1
 262 #define TLSRX_HDR_PKT_CCDX_ERROR_V(x)    ((x) << TLSRX_HDR_PKT_CCDX_ERROR_S)
 263 #define TLSRX_HDR_PKT_CCDX_ERROR_G(x)    \
 264         (((x) >> TLSRX_HDR_PKT_CCDX_ERROR_S) & TLSRX_HDR_PKT_CCDX_ERROR_M)
 265 #define TLSRX_HDR_PKT_CCDX_ERROR_F       TLSRX_HDR_PKT_CCDX_ERROR_V(1U)
 266
 267 #define TLSRX_HDR_PKT_PAD_ERROR_S        1
 268 #define TLSRX_HDR_PKT_PAD_ERROR_M        0x1
 269 #define TLSRX_HDR_PKT_PAD_ERROR_V(x)     ((x) << TLSRX_HDR_PKT_PAD_ERROR_S)
 270 #define TLSRX_HDR_PKT_PAD_ERROR_G(x)     \
 271         (((x) >> TLSRX_HDR_PKT_PAD_ERROR_S) & TLSRX_HDR_PKT_PAD_ERROR_M)
 272 #define TLSRX_HDR_PKT_PAD_ERROR_F        TLSRX_HDR_PKT_PAD_ERROR_V(1U)
 273
 274 #define TLSRX_HDR_PKT_MAC_ERROR_S        0
 275 #define TLSRX_HDR_PKT_MAC_ERROR_M        0x1
 276 #define TLSRX_HDR_PKT_MAC_ERROR_V(x)     ((x) << TLSRX_HDR_PKT_MAC_ERROR)
 277 #define TLSRX_HDR_PKT_MAC_ERROR_G(x)     \
 278         (((x) >> S_TLSRX_HDR_PKT_MAC_ERROR_S) & TLSRX_HDR_PKT_MAC_ERROR_M)
 279 #define TLSRX_HDR_PKT_MAC_ERROR_F        TLSRX_HDR_PKT_MAC_ERROR_V(1U)
 280
 281 #define TLSRX_HDR_PKT_ERROR_M           0x1F
 282 #define CONTENT_TYPE_ERROR              0x7F
 283
 284 struct ulp_mem_rw {
 285         __be32 cmd;
 286         __be32 len16;             /* command length */
 287         __be32 dlen;              /* data length in 32-byte units */
 288         __be32 lock_addr;
 289 };
 290
 291 struct tls_key_wr {
 292         __be32 op_to_compl;
 293         __be32 flowid_len16;
 294         __be32 ftid;
 295         u8   reneg_to_write_rx;
 296         u8   protocol;
 297         __be16 mfs;
 298 };
 299
 300 struct tls_key_req {
 301         struct tls_key_wr wr;
 302         struct ulp_mem_rw req;
 303         struct ulptx_idata sc_imm;
 304 };
 305
 306 /*
 307  * This lives in skb->cb and is used to chain WRs in a linked list.
 308  */
 309 struct wr_skb_cb {
 310         struct l2t_skb_cb l2t;          /* reserve space for l2t CB */
 311         struct sk_buff *next_wr;        /* next write request */
 312 };
 313
 314 /* Per-skb backlog handler.  Run when a socket's backlog is processed. */
 315 struct blog_skb_cb {
 316         void (*backlog_rcv)(struct sock *sk, struct sk_buff *skb);
 317         struct chtls_dev *cdev;
 318 };
 319
 320 /*
 321  * Similar to tcp_skb_cb but with ULP elements added to support TLS,
 322  * etc.
 323  */
 324 struct ulp_skb_cb {
 325         struct wr_skb_cb wr;            /* reserve space for write request */
 326         u16 flags;                      /* TCP-like flags */
 327         u8 psh;
 328         u8 ulp_mode;                    /* ULP mode/submode of sk_buff */
 329         u32 seq;                        /* TCP sequence number */
 330         union { /* ULP-specific fields */
 331                 struct {
 332                         u8  type;
 333                         u8  ofld;
 334                         u8  iv;
 335                 } tls;
 336         } ulp;
 337 };
 338
 339 #define ULP_SKB_CB(skb) ((struct ulp_skb_cb *)&((skb)->cb[0]))
 340 #define BLOG_SKB_CB(skb) ((struct blog_skb_cb *)(skb)->cb)
 341
 342 /*
 343  * Flags for ulp_skb_cb.flags.
 344  */
 345 enum {
 346         ULPCB_FLAG_NEED_HDR  = 1 << 0,  /* packet needs a TX_DATA_WR header */
 347         ULPCB_FLAG_NO_APPEND = 1 << 1,  /* don't grow this skb */
 348         ULPCB_FLAG_BARRIER   = 1 << 2,  /* set TX_WAIT_IDLE after sending */
 349         ULPCB_FLAG_HOLD      = 1 << 3,  /* skb not ready for Tx yet */
 350         ULPCB_FLAG_COMPL     = 1 << 4,  /* request WR completion */
 351         ULPCB_FLAG_URG       = 1 << 5,  /* urgent data */
 352         ULPCB_FLAG_TLS_HDR   = 1 << 6,  /* payload with tls hdr */
 353         ULPCB_FLAG_NO_HDR    = 1 << 7,  /* not a ofld wr */
 354 };
 355
 356 /* The ULP mode/submode of an skbuff */
 357 #define skb_ulp_mode(skb)  (ULP_SKB_CB(skb)->ulp_mode)
 358 #define TCP_PAGE(sk)   (sk->sk_frag.page)
 359 #define TCP_OFF(sk)    (sk->sk_frag.offset)
 360
 361 static inline struct chtls_dev *to_chtls_dev(struct tls_device *tlsdev)
 362 {
 363         return container_of(tlsdev, struct chtls_dev, tlsdev);
 364 }
 365
 366 static inline void csk_set_flag(struct chtls_sock *csk,
 367                                 enum csk_flags flag)
 368 {
 369         __set_bit(flag, &csk->flags);
 370 }
 371
 372 static inline void csk_reset_flag(struct chtls_sock *csk,
 373                                   enum csk_flags flag)
 374 {
 375         __clear_bit(flag, &csk->flags);
 376 }
 377
 378 static inline bool csk_conn_inline(const struct chtls_sock *csk)
 379 {
 380         return test_bit(CSK_CONN_INLINE, &csk->flags);
 381 }
 382
 383 static inline int csk_flag(const struct sock *sk, enum csk_flags flag)
 384 {
 385         struct chtls_sock *csk = rcu_dereference_sk_user_data(sk);
 386
 387         if (!csk_conn_inline(csk))
 388                 return 0;
 389         return test_bit(flag, &csk->flags);
 390 }
 391
 392 static inline int csk_flag_nochk(const struct chtls_sock *csk,
 393                                  enum csk_flags flag)
 394 {
 395         return test_bit(flag, &csk->flags);
 396 }
 397
 398 static inline void *cplhdr(struct sk_buff *skb)
 399 {
 400         return skb->data;
 401 }
 402
 403 static inline int is_neg_adv(unsigned int status)
 404 {
 405         return status == CPL_ERR_RTX_NEG_ADVICE ||
 406                status == CPL_ERR_KEEPALV_NEG_ADVICE ||
 407                status == CPL_ERR_PERSIST_NEG_ADVICE;
 408 }
 409
 410 static inline void process_cpl_msg(void (*fn)(struct sock *, struct sk_buff *),
 411                                    struct sock *sk,
 412                                    struct sk_buff *skb)
 413 {
 414         skb_reset_mac_header(skb);
 415         skb_reset_network_header(skb);
 416         skb_reset_transport_header(skb);
 417
 418         bh_lock_sock(sk);
 419         if (unlikely(sock_owned_by_user(sk))) {
 420                 BLOG_SKB_CB(skb)->backlog_rcv = fn;
 421                 __sk_add_backlog(sk, skb);
 422         } else {
 423                 fn(sk, skb);
 424         }
 425         bh_unlock_sock(sk);
 426 }
 427
 428 static inline void chtls_sock_free(struct kref *ref)
 429 {
 430         struct chtls_sock *csk = container_of(ref, struct chtls_sock,
 431                                               kref);
 432         kfree(csk);
 433 }
 434
 435 static inline void __chtls_sock_put(const char *fn, struct chtls_sock *csk)
 436 {
 437         kref_put(&csk->kref, chtls_sock_free);
 438 }
 439
 440 static inline void __chtls_sock_get(const char *fn,
 441                                     struct chtls_sock *csk)
 442 {
 443         kref_get(&csk->kref);
 444 }
 445
 446 static inline void send_or_defer(struct sock *sk, struct tcp_sock *tp,
 447                                  struct sk_buff *skb, int through_l2t)
 448 {
 449         struct chtls_sock *csk = rcu_dereference_sk_user_data(sk);
 450
 451         if (through_l2t) {
 452                 /* send through L2T */
 453                 cxgb4_l2t_send(csk->egress_dev, skb, csk->l2t_entry);
 454         } else {
 455                 /* send directly */
 456                 cxgb4_ofld_send(csk->egress_dev, skb);
 457         }
 458 }
 459
 460 typedef int (*chtls_handler_func)(struct chtls_dev *, struct sk_buff *);
 461 extern chtls_handler_func chtls_handlers[NUM_CPL_CMDS];
 462 void chtls_install_cpl_ops(struct sock *sk);
 463 int chtls_init_kmap(struct chtls_dev *cdev, struct cxgb4_lld_info *lldi);
 464 void chtls_listen_stop(struct chtls_dev *cdev, struct sock *sk);
 465 int chtls_listen_start(struct chtls_dev *cdev, struct sock *sk);
 466 void chtls_close(struct sock *sk, long timeout);
 467 int chtls_disconnect(struct sock *sk, int flags);
 468 void chtls_shutdown(struct sock *sk, int how);
 469 void chtls_destroy_sock(struct sock *sk);
 470 int chtls_sendmsg(struct sock *sk, struct msghdr *msg, size_t size);
 471 int chtls_recvmsg(struct sock *sk, struct msghdr *msg,
 472                   size_t len, int nonblock, int flags, int *addr_len);
 473 int chtls_sendpage(struct sock *sk, struct page *page,
 474                    int offset, size_t size, int flags);
 475 int send_tx_flowc_wr(struct sock *sk, int compl,
 476                      u32 snd_nxt, u32 rcv_nxt);
 477 void chtls_tcp_push(struct sock *sk, int flags);
 478 int chtls_push_frames(struct chtls_sock *csk, int comp);
 479 int chtls_set_tcb_tflag(struct sock *sk, unsigned int bit_pos, int val);
 480 int chtls_setkey(struct chtls_sock *csk, u32 keylen, u32 mode);
 481 void skb_entail(struct sock *sk, struct sk_buff *skb, int flags);
 482 unsigned int keyid_to_addr(int start_addr, int keyid);
 483 void free_tls_keyid(struct sock *sk);
 484 #endif