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TOMOYO Linux Cross Reference
Linux/include/net/tls.h

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  1 /*
  2  * Copyright (c) 2016-2017, Mellanox Technologies. All rights reserved.
  3  * Copyright (c) 2016-2017, Dave Watson <davejwatson@fb.com>. All rights reserved.
  4  *
  5  * This software is available to you under a choice of one of two
  6  * licenses.  You may choose to be licensed under the terms of the GNU
  7  * General Public License (GPL) Version 2, available from the file
  8  * COPYING in the main directory of this source tree, or the
  9  * OpenIB.org BSD license below:
 10  *
 11  *     Redistribution and use in source and binary forms, with or
 12  *     without modification, are permitted provided that the following
 13  *     conditions are met:
 14  *
 15  *      - Redistributions of source code must retain the above
 16  *        copyright notice, this list of conditions and the following
 17  *        disclaimer.
 18  *
 19  *      - Redistributions in binary form must reproduce the above
 20  *        copyright notice, this list of conditions and the following
 21  *        disclaimer in the documentation and/or other materials
 22  *        provided with the distribution.
 23  *
 24  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 25  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 26  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 27  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 28  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 29  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 30  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 31  * SOFTWARE.
 32  */
 33 
 34 #ifndef _TLS_OFFLOAD_H
 35 #define _TLS_OFFLOAD_H
 36 
 37 #include <linux/types.h>
 38 #include <asm/byteorder.h>
 39 #include <linux/crypto.h>
 40 #include <linux/socket.h>
 41 #include <linux/tcp.h>
 42 #include <linux/skmsg.h>
 43 #include <linux/mutex.h>
 44 #include <linux/netdevice.h>
 45 #include <linux/rcupdate.h>
 46 
 47 #include <net/net_namespace.h>
 48 #include <net/tcp.h>
 49 #include <net/strparser.h>
 50 #include <crypto/aead.h>
 51 #include <uapi/linux/tls.h>
 52 
 53 
 54 /* Maximum data size carried in a TLS record */
 55 #define TLS_MAX_PAYLOAD_SIZE            ((size_t)1 << 14)
 56 
 57 #define TLS_HEADER_SIZE                 5
 58 #define TLS_NONCE_OFFSET                TLS_HEADER_SIZE
 59 
 60 #define TLS_CRYPTO_INFO_READY(info)     ((info)->cipher_type)
 61 
 62 #define TLS_RECORD_TYPE_DATA            0x17
 63 
 64 #define TLS_AAD_SPACE_SIZE              13
 65 
 66 #define MAX_IV_SIZE                     16
 67 #define TLS_MAX_REC_SEQ_SIZE            8
 68 
 69 /* For AES-CCM, the full 16-bytes of IV is made of '4' fields of given sizes.
 70  *
 71  * IV[16] = b0[1] || implicit nonce[4] || explicit nonce[8] || length[3]
 72  *
 73  * The field 'length' is encoded in field 'b0' as '(length width - 1)'.
 74  * Hence b0 contains (3 - 1) = 2.
 75  */
 76 #define TLS_AES_CCM_IV_B0_BYTE          2
 77 
 78 #define __TLS_INC_STATS(net, field)                             \
 79         __SNMP_INC_STATS((net)->mib.tls_statistics, field)
 80 #define TLS_INC_STATS(net, field)                               \
 81         SNMP_INC_STATS((net)->mib.tls_statistics, field)
 82 #define __TLS_DEC_STATS(net, field)                             \
 83         __SNMP_DEC_STATS((net)->mib.tls_statistics, field)
 84 #define TLS_DEC_STATS(net, field)                               \
 85         SNMP_DEC_STATS((net)->mib.tls_statistics, field)
 86 
 87 enum {
 88         TLS_BASE,
 89         TLS_SW,
 90         TLS_HW,
 91         TLS_HW_RECORD,
 92         TLS_NUM_CONFIG,
 93 };
 94 
 95 /* TLS records are maintained in 'struct tls_rec'. It stores the memory pages
 96  * allocated or mapped for each TLS record. After encryption, the records are
 97  * stores in a linked list.
 98  */
 99 struct tls_rec {
100         struct list_head list;
101         int tx_ready;
102         int tx_flags;
103 
104         struct sk_msg msg_plaintext;
105         struct sk_msg msg_encrypted;
106 
107         /* AAD | msg_plaintext.sg.data | sg_tag */
108         struct scatterlist sg_aead_in[2];
109         /* AAD | msg_encrypted.sg.data (data contains overhead for hdr & iv & tag) */
110         struct scatterlist sg_aead_out[2];
111 
112         char content_type;
113         struct scatterlist sg_content_type;
114 
115         char aad_space[TLS_AAD_SPACE_SIZE];
116         u8 iv_data[MAX_IV_SIZE];
117         struct aead_request aead_req;
118         u8 aead_req_ctx[];
119 };
120 
121 struct tls_msg {
122         struct strp_msg rxm;
123         u8 control;
124 };
125 
126 struct tx_work {
127         struct delayed_work work;
128         struct sock *sk;
129 };
130 
131 struct tls_sw_context_tx {
132         struct crypto_aead *aead_send;
133         struct crypto_wait async_wait;
134         struct tx_work tx_work;
135         struct tls_rec *open_rec;
136         struct list_head tx_list;
137         atomic_t encrypt_pending;
138         /* protect crypto_wait with encrypt_pending */
139         spinlock_t encrypt_compl_lock;
140         int async_notify;
141         u8 async_capable:1;
142 
143 #define BIT_TX_SCHEDULED        0
144 #define BIT_TX_CLOSING          1
145         unsigned long tx_bitmask;
146 };
147 
148 struct tls_sw_context_rx {
149         struct crypto_aead *aead_recv;
150         struct crypto_wait async_wait;
151         struct strparser strp;
152         struct sk_buff_head rx_list;    /* list of decrypted 'data' records */
153         void (*saved_data_ready)(struct sock *sk);
154 
155         struct sk_buff *recv_pkt;
156         u8 control;
157         u8 async_capable:1;
158         u8 decrypted:1;
159         atomic_t decrypt_pending;
160         /* protect crypto_wait with decrypt_pending*/
161         spinlock_t decrypt_compl_lock;
162         bool async_notify;
163 };
164 
165 struct tls_record_info {
166         struct list_head list;
167         u32 end_seq;
168         int len;
169         int num_frags;
170         skb_frag_t frags[MAX_SKB_FRAGS];
171 };
172 
173 struct tls_offload_context_tx {
174         struct crypto_aead *aead_send;
175         spinlock_t lock;        /* protects records list */
176         struct list_head records_list;
177         struct tls_record_info *open_record;
178         struct tls_record_info *retransmit_hint;
179         u64 hint_record_sn;
180         u64 unacked_record_sn;
181 
182         struct scatterlist sg_tx_data[MAX_SKB_FRAGS];
183         void (*sk_destruct)(struct sock *sk);
184         u8 driver_state[] __aligned(8);
185         /* The TLS layer reserves room for driver specific state
186          * Currently the belief is that there is not enough
187          * driver specific state to justify another layer of indirection
188          */
189 #define TLS_DRIVER_STATE_SIZE_TX        16
190 };
191 
192 #define TLS_OFFLOAD_CONTEXT_SIZE_TX                                            \
193         (sizeof(struct tls_offload_context_tx) + TLS_DRIVER_STATE_SIZE_TX)
194 
195 enum tls_context_flags {
196         TLS_RX_SYNC_RUNNING = 0,
197         /* Unlike RX where resync is driven entirely by the core in TX only
198          * the driver knows when things went out of sync, so we need the flag
199          * to be atomic.
200          */
201         TLS_TX_SYNC_SCHED = 1,
202 };
203 
204 struct cipher_context {
205         char *iv;
206         char *rec_seq;
207 };
208 
209 union tls_crypto_context {
210         struct tls_crypto_info info;
211         union {
212                 struct tls12_crypto_info_aes_gcm_128 aes_gcm_128;
213                 struct tls12_crypto_info_aes_gcm_256 aes_gcm_256;
214         };
215 };
216 
217 struct tls_prot_info {
218         u16 version;
219         u16 cipher_type;
220         u16 prepend_size;
221         u16 tag_size;
222         u16 overhead_size;
223         u16 iv_size;
224         u16 salt_size;
225         u16 rec_seq_size;
226         u16 aad_size;
227         u16 tail_size;
228 };
229 
230 struct tls_context {
231         /* read-only cache line */
232         struct tls_prot_info prot_info;
233 
234         u8 tx_conf:3;
235         u8 rx_conf:3;
236 
237         int (*push_pending_record)(struct sock *sk, int flags);
238         void (*sk_write_space)(struct sock *sk);
239 
240         void *priv_ctx_tx;
241         void *priv_ctx_rx;
242 
243         struct net_device *netdev;
244 
245         /* rw cache line */
246         struct cipher_context tx;
247         struct cipher_context rx;
248 
249         struct scatterlist *partially_sent_record;
250         u16 partially_sent_offset;
251 
252         bool in_tcp_sendpages;
253         bool pending_open_record_frags;
254 
255         struct mutex tx_lock; /* protects partially_sent_* fields and
256                                * per-type TX fields
257                                */
258         unsigned long flags;
259 
260         /* cache cold stuff */
261         struct proto *sk_proto;
262 
263         void (*sk_destruct)(struct sock *sk);
264 
265         union tls_crypto_context crypto_send;
266         union tls_crypto_context crypto_recv;
267 
268         struct list_head list;
269         refcount_t refcount;
270         struct rcu_head rcu;
271 };
272 
273 enum tls_offload_ctx_dir {
274         TLS_OFFLOAD_CTX_DIR_RX,
275         TLS_OFFLOAD_CTX_DIR_TX,
276 };
277 
278 struct tlsdev_ops {
279         int (*tls_dev_add)(struct net_device *netdev, struct sock *sk,
280                            enum tls_offload_ctx_dir direction,
281                            struct tls_crypto_info *crypto_info,
282                            u32 start_offload_tcp_sn);
283         void (*tls_dev_del)(struct net_device *netdev,
284                             struct tls_context *ctx,
285                             enum tls_offload_ctx_dir direction);
286         int (*tls_dev_resync)(struct net_device *netdev,
287                               struct sock *sk, u32 seq, u8 *rcd_sn,
288                               enum tls_offload_ctx_dir direction);
289 };
290 
291 enum tls_offload_sync_type {
292         TLS_OFFLOAD_SYNC_TYPE_DRIVER_REQ = 0,
293         TLS_OFFLOAD_SYNC_TYPE_CORE_NEXT_HINT = 1,
294 };
295 
296 #define TLS_DEVICE_RESYNC_NH_START_IVAL         2
297 #define TLS_DEVICE_RESYNC_NH_MAX_IVAL           128
298 
299 struct tls_offload_context_rx {
300         /* sw must be the first member of tls_offload_context_rx */
301         struct tls_sw_context_rx sw;
302         enum tls_offload_sync_type resync_type;
303         /* this member is set regardless of resync_type, to avoid branches */
304         u8 resync_nh_reset:1;
305         /* CORE_NEXT_HINT-only member, but use the hole here */
306         u8 resync_nh_do_now:1;
307         union {
308                 /* TLS_OFFLOAD_SYNC_TYPE_DRIVER_REQ */
309                 struct {
310                         atomic64_t resync_req;
311                 };
312                 /* TLS_OFFLOAD_SYNC_TYPE_CORE_NEXT_HINT */
313                 struct {
314                         u32 decrypted_failed;
315                         u32 decrypted_tgt;
316                 } resync_nh;
317         };
318         u8 driver_state[] __aligned(8);
319         /* The TLS layer reserves room for driver specific state
320          * Currently the belief is that there is not enough
321          * driver specific state to justify another layer of indirection
322          */
323 #define TLS_DRIVER_STATE_SIZE_RX        8
324 };
325 
326 #define TLS_OFFLOAD_CONTEXT_SIZE_RX                                     \
327         (sizeof(struct tls_offload_context_rx) + TLS_DRIVER_STATE_SIZE_RX)
328 
329 struct tls_context *tls_ctx_create(struct sock *sk);
330 void tls_ctx_free(struct sock *sk, struct tls_context *ctx);
331 void update_sk_prot(struct sock *sk, struct tls_context *ctx);
332 
333 int wait_on_pending_writer(struct sock *sk, long *timeo);
334 int tls_sk_query(struct sock *sk, int optname, char __user *optval,
335                 int __user *optlen);
336 int tls_sk_attach(struct sock *sk, int optname, char __user *optval,
337                   unsigned int optlen);
338 
339 int tls_set_sw_offload(struct sock *sk, struct tls_context *ctx, int tx);
340 void tls_sw_strparser_arm(struct sock *sk, struct tls_context *ctx);
341 void tls_sw_strparser_done(struct tls_context *tls_ctx);
342 int tls_sw_sendmsg(struct sock *sk, struct msghdr *msg, size_t size);
343 int tls_sw_sendpage_locked(struct sock *sk, struct page *page,
344                            int offset, size_t size, int flags);
345 int tls_sw_sendpage(struct sock *sk, struct page *page,
346                     int offset, size_t size, int flags);
347 void tls_sw_cancel_work_tx(struct tls_context *tls_ctx);
348 void tls_sw_release_resources_tx(struct sock *sk);
349 void tls_sw_free_ctx_tx(struct tls_context *tls_ctx);
350 void tls_sw_free_resources_rx(struct sock *sk);
351 void tls_sw_release_resources_rx(struct sock *sk);
352 void tls_sw_free_ctx_rx(struct tls_context *tls_ctx);
353 int tls_sw_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
354                    int nonblock, int flags, int *addr_len);
355 bool tls_sw_stream_read(const struct sock *sk);
356 ssize_t tls_sw_splice_read(struct socket *sock, loff_t *ppos,
357                            struct pipe_inode_info *pipe,
358                            size_t len, unsigned int flags);
359 
360 int tls_device_sendmsg(struct sock *sk, struct msghdr *msg, size_t size);
361 int tls_device_sendpage(struct sock *sk, struct page *page,
362                         int offset, size_t size, int flags);
363 int tls_tx_records(struct sock *sk, int flags);
364 
365 struct tls_record_info *tls_get_record(struct tls_offload_context_tx *context,
366                                        u32 seq, u64 *p_record_sn);
367 
368 static inline bool tls_record_is_start_marker(struct tls_record_info *rec)
369 {
370         return rec->len == 0;
371 }
372 
373 static inline u32 tls_record_start_seq(struct tls_record_info *rec)
374 {
375         return rec->end_seq - rec->len;
376 }
377 
378 int tls_push_sg(struct sock *sk, struct tls_context *ctx,
379                 struct scatterlist *sg, u16 first_offset,
380                 int flags);
381 int tls_push_partial_record(struct sock *sk, struct tls_context *ctx,
382                             int flags);
383 void tls_free_partial_record(struct sock *sk, struct tls_context *ctx);
384 
385 static inline struct tls_msg *tls_msg(struct sk_buff *skb)
386 {
387         return (struct tls_msg *)strp_msg(skb);
388 }
389 
390 static inline bool tls_is_partially_sent_record(struct tls_context *ctx)
391 {
392         return !!ctx->partially_sent_record;
393 }
394 
395 static inline bool tls_is_pending_open_record(struct tls_context *tls_ctx)
396 {
397         return tls_ctx->pending_open_record_frags;
398 }
399 
400 static inline bool is_tx_ready(struct tls_sw_context_tx *ctx)
401 {
402         struct tls_rec *rec;
403 
404         rec = list_first_entry(&ctx->tx_list, struct tls_rec, list);
405         if (!rec)
406                 return false;
407 
408         return READ_ONCE(rec->tx_ready);
409 }
410 
411 static inline u16 tls_user_config(struct tls_context *ctx, bool tx)
412 {
413         u16 config = tx ? ctx->tx_conf : ctx->rx_conf;
414 
415         switch (config) {
416         case TLS_BASE:
417                 return TLS_CONF_BASE;
418         case TLS_SW:
419                 return TLS_CONF_SW;
420         case TLS_HW:
421                 return TLS_CONF_HW;
422         case TLS_HW_RECORD:
423                 return TLS_CONF_HW_RECORD;
424         }
425         return 0;
426 }
427 
428 struct sk_buff *
429 tls_validate_xmit_skb(struct sock *sk, struct net_device *dev,
430                       struct sk_buff *skb);
431 
432 static inline bool tls_is_sk_tx_device_offloaded(struct sock *sk)
433 {
434 #ifdef CONFIG_SOCK_VALIDATE_XMIT
435         return sk_fullsock(sk) &&
436                (smp_load_acquire(&sk->sk_validate_xmit_skb) ==
437                &tls_validate_xmit_skb);
438 #else
439         return false;
440 #endif
441 }
442 
443 static inline void tls_err_abort(struct sock *sk, int err)
444 {
445         sk->sk_err = err;
446         sk->sk_error_report(sk);
447 }
448 
449 static inline bool tls_bigint_increment(unsigned char *seq, int len)
450 {
451         int i;
452 
453         for (i = len - 1; i >= 0; i--) {
454                 ++seq[i];
455                 if (seq[i] != 0)
456                         break;
457         }
458 
459         return (i == -1);
460 }
461 
462 static inline struct tls_context *tls_get_ctx(const struct sock *sk)
463 {
464         struct inet_connection_sock *icsk = inet_csk(sk);
465 
466         /* Use RCU on icsk_ulp_data only for sock diag code,
467          * TLS data path doesn't need rcu_dereference().
468          */
469         return (__force void *)icsk->icsk_ulp_data;
470 }
471 
472 static inline void tls_advance_record_sn(struct sock *sk,
473                                          struct tls_prot_info *prot,
474                                          struct cipher_context *ctx)
475 {
476         if (tls_bigint_increment(ctx->rec_seq, prot->rec_seq_size))
477                 tls_err_abort(sk, EBADMSG);
478 
479         if (prot->version != TLS_1_3_VERSION)
480                 tls_bigint_increment(ctx->iv + TLS_CIPHER_AES_GCM_128_SALT_SIZE,
481                                      prot->iv_size);
482 }
483 
484 static inline void tls_fill_prepend(struct tls_context *ctx,
485                              char *buf,
486                              size_t plaintext_len,
487                              unsigned char record_type,
488                              int version)
489 {
490         struct tls_prot_info *prot = &ctx->prot_info;
491         size_t pkt_len, iv_size = prot->iv_size;
492 
493         pkt_len = plaintext_len + prot->tag_size;
494         if (version != TLS_1_3_VERSION) {
495                 pkt_len += iv_size;
496 
497                 memcpy(buf + TLS_NONCE_OFFSET,
498                        ctx->tx.iv + TLS_CIPHER_AES_GCM_128_SALT_SIZE, iv_size);
499         }
500 
501         /* we cover nonce explicit here as well, so buf should be of
502          * size KTLS_DTLS_HEADER_SIZE + KTLS_DTLS_NONCE_EXPLICIT_SIZE
503          */
504         buf[0] = version == TLS_1_3_VERSION ?
505                    TLS_RECORD_TYPE_DATA : record_type;
506         /* Note that VERSION must be TLS_1_2 for both TLS1.2 and TLS1.3 */
507         buf[1] = TLS_1_2_VERSION_MINOR;
508         buf[2] = TLS_1_2_VERSION_MAJOR;
509         /* we can use IV for nonce explicit according to spec */
510         buf[3] = pkt_len >> 8;
511         buf[4] = pkt_len & 0xFF;
512 }
513 
514 static inline void tls_make_aad(char *buf,
515                                 size_t size,
516                                 char *record_sequence,
517                                 int record_sequence_size,
518                                 unsigned char record_type,
519                                 int version)
520 {
521         if (version != TLS_1_3_VERSION) {
522                 memcpy(buf, record_sequence, record_sequence_size);
523                 buf += 8;
524         } else {
525                 size += TLS_CIPHER_AES_GCM_128_TAG_SIZE;
526         }
527 
528         buf[0] = version == TLS_1_3_VERSION ?
529                   TLS_RECORD_TYPE_DATA : record_type;
530         buf[1] = TLS_1_2_VERSION_MAJOR;
531         buf[2] = TLS_1_2_VERSION_MINOR;
532         buf[3] = size >> 8;
533         buf[4] = size & 0xFF;
534 }
535 
536 static inline void xor_iv_with_seq(int version, char *iv, char *seq)
537 {
538         int i;
539 
540         if (version == TLS_1_3_VERSION) {
541                 for (i = 0; i < 8; i++)
542                         iv[i + 4] ^= seq[i];
543         }
544 }
545 
546 
547 static inline struct tls_sw_context_rx *tls_sw_ctx_rx(
548                 const struct tls_context *tls_ctx)
549 {
550         return (struct tls_sw_context_rx *)tls_ctx->priv_ctx_rx;
551 }
552 
553 static inline struct tls_sw_context_tx *tls_sw_ctx_tx(
554                 const struct tls_context *tls_ctx)
555 {
556         return (struct tls_sw_context_tx *)tls_ctx->priv_ctx_tx;
557 }
558 
559 static inline struct tls_offload_context_tx *
560 tls_offload_ctx_tx(const struct tls_context *tls_ctx)
561 {
562         return (struct tls_offload_context_tx *)tls_ctx->priv_ctx_tx;
563 }
564 
565 static inline bool tls_sw_has_ctx_tx(const struct sock *sk)
566 {
567         struct tls_context *ctx = tls_get_ctx(sk);
568 
569         if (!ctx)
570                 return false;
571         return !!tls_sw_ctx_tx(ctx);
572 }
573 
574 static inline bool tls_sw_has_ctx_rx(const struct sock *sk)
575 {
576         struct tls_context *ctx = tls_get_ctx(sk);
577 
578         if (!ctx)
579                 return false;
580         return !!tls_sw_ctx_rx(ctx);
581 }
582 
583 void tls_sw_write_space(struct sock *sk, struct tls_context *ctx);
584 void tls_device_write_space(struct sock *sk, struct tls_context *ctx);
585 
586 static inline struct tls_offload_context_rx *
587 tls_offload_ctx_rx(const struct tls_context *tls_ctx)
588 {
589         return (struct tls_offload_context_rx *)tls_ctx->priv_ctx_rx;
590 }
591 
592 #if IS_ENABLED(CONFIG_TLS_DEVICE)
593 static inline void *__tls_driver_ctx(struct tls_context *tls_ctx,
594                                      enum tls_offload_ctx_dir direction)
595 {
596         if (direction == TLS_OFFLOAD_CTX_DIR_TX)
597                 return tls_offload_ctx_tx(tls_ctx)->driver_state;
598         else
599                 return tls_offload_ctx_rx(tls_ctx)->driver_state;
600 }
601 
602 static inline void *
603 tls_driver_ctx(const struct sock *sk, enum tls_offload_ctx_dir direction)
604 {
605         return __tls_driver_ctx(tls_get_ctx(sk), direction);
606 }
607 #endif
608 
609 /* The TLS context is valid until sk_destruct is called */
610 static inline void tls_offload_rx_resync_request(struct sock *sk, __be32 seq)
611 {
612         struct tls_context *tls_ctx = tls_get_ctx(sk);
613         struct tls_offload_context_rx *rx_ctx = tls_offload_ctx_rx(tls_ctx);
614 
615         atomic64_set(&rx_ctx->resync_req, ((u64)ntohl(seq) << 32) | 1);
616 }
617 
618 static inline void
619 tls_offload_rx_resync_set_type(struct sock *sk, enum tls_offload_sync_type type)
620 {
621         struct tls_context *tls_ctx = tls_get_ctx(sk);
622 
623         tls_offload_ctx_rx(tls_ctx)->resync_type = type;
624 }
625 
626 /* Driver's seq tracking has to be disabled until resync succeeded */
627 static inline bool tls_offload_tx_resync_pending(struct sock *sk)
628 {
629         struct tls_context *tls_ctx = tls_get_ctx(sk);
630         bool ret;
631 
632         ret = test_bit(TLS_TX_SYNC_SCHED, &tls_ctx->flags);
633         smp_mb__after_atomic();
634         return ret;
635 }
636 
637 int __net_init tls_proc_init(struct net *net);
638 void __net_exit tls_proc_fini(struct net *net);
639 
640 int tls_proccess_cmsg(struct sock *sk, struct msghdr *msg,
641                       unsigned char *record_type);
642 int decrypt_skb(struct sock *sk, struct sk_buff *skb,
643                 struct scatterlist *sgout);
644 struct sk_buff *tls_encrypt_skb(struct sk_buff *skb);
645 
646 struct sk_buff *tls_validate_xmit_skb(struct sock *sk,
647                                       struct net_device *dev,
648                                       struct sk_buff *skb);
649 
650 int tls_sw_fallback_init(struct sock *sk,
651                          struct tls_offload_context_tx *offload_ctx,
652                          struct tls_crypto_info *crypto_info);
653 
654 #ifdef CONFIG_TLS_DEVICE
655 void tls_device_init(void);
656 void tls_device_cleanup(void);
657 void tls_device_sk_destruct(struct sock *sk);
658 int tls_set_device_offload(struct sock *sk, struct tls_context *ctx);
659 void tls_device_free_resources_tx(struct sock *sk);
660 int tls_set_device_offload_rx(struct sock *sk, struct tls_context *ctx);
661 void tls_device_offload_cleanup_rx(struct sock *sk);
662 void tls_device_rx_resync_new_rec(struct sock *sk, u32 rcd_len, u32 seq);
663 void tls_offload_tx_resync_request(struct sock *sk, u32 got_seq, u32 exp_seq);
664 int tls_device_decrypted(struct sock *sk, struct tls_context *tls_ctx,
665                          struct sk_buff *skb, struct strp_msg *rxm);
666 
667 static inline bool tls_is_sk_rx_device_offloaded(struct sock *sk)
668 {
669         if (!sk_fullsock(sk) ||
670             smp_load_acquire(&sk->sk_destruct) != tls_device_sk_destruct)
671                 return false;
672         return tls_get_ctx(sk)->rx_conf == TLS_HW;
673 }
674 #else
675 static inline void tls_device_init(void) {}
676 static inline void tls_device_cleanup(void) {}
677 
678 static inline int
679 tls_set_device_offload(struct sock *sk, struct tls_context *ctx)
680 {
681         return -EOPNOTSUPP;
682 }
683 
684 static inline void tls_device_free_resources_tx(struct sock *sk) {}
685 
686 static inline int
687 tls_set_device_offload_rx(struct sock *sk, struct tls_context *ctx)
688 {
689         return -EOPNOTSUPP;
690 }
691 
692 static inline void tls_device_offload_cleanup_rx(struct sock *sk) {}
693 static inline void
694 tls_device_rx_resync_new_rec(struct sock *sk, u32 rcd_len, u32 seq) {}
695 
696 static inline int
697 tls_device_decrypted(struct sock *sk, struct tls_context *tls_ctx,
698                      struct sk_buff *skb, struct strp_msg *rxm)
699 {
700         return 0;
701 }
702 #endif
703 #endif /* _TLS_OFFLOAD_H */
704 

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