2 * Copyright (c) 2016-2017, Mellanox Technologies. All rights reserved.
3 * Copyright (c) 2016-2017, Dave Watson <davejwatson@fb.com>. All rights reserved.
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:
11 * Redistribution and use in source and binary forms, with or
12 * without modification, are permitted provided that the following
15 * - Redistributions of source code must retain the above
16 * copyright notice, this list of conditions and the following
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.
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
34 #ifndef _TLS_OFFLOAD_H
35 #define _TLS_OFFLOAD_H
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>
43 #include <net/strparser.h>
45 #include <uapi/linux/tls.h>
48 /* Maximum data size carried in a TLS record */
49 #define TLS_MAX_PAYLOAD_SIZE ((size_t)1 << 14)
51 #define TLS_HEADER_SIZE 5
52 #define TLS_NONCE_OFFSET TLS_HEADER_SIZE
54 #define TLS_CRYPTO_INFO_READY(info) ((info)->cipher_type)
56 #define TLS_RECORD_TYPE_DATA 0x17
58 #define TLS_AAD_SPACE_SIZE 13
59 #define TLS_DEVICE_NAME_MAX 32
62 * This structure defines the routines for Inline TLS driver.
63 * The following routines are optional and filled with a
64 * null pointer if not defined.
66 * @name: Its the name of registered Inline tls device
67 * @dev_list: Inline tls device list
68 * int (*feature)(struct tls_device *device);
69 * Called to return Inline TLS driver capability
71 * int (*hash)(struct tls_device *device, struct sock *sk);
72 * This function sets Inline driver for listen and program
73 * device specific functioanlity as required
75 * void (*unhash)(struct tls_device *device, struct sock *sk);
76 * This function cleans listen state set by Inline TLS driver
79 char name[TLS_DEVICE_NAME_MAX];
80 struct list_head dev_list;
81 int (*feature)(struct tls_device *device);
82 int (*hash)(struct tls_device *device, struct sock *sk);
83 void (*unhash)(struct tls_device *device, struct sock *sk);
89 #ifdef CONFIG_TLS_DEVICE
96 struct tls_sw_context_tx {
97 struct crypto_aead *aead_send;
98 struct crypto_wait async_wait;
100 char aad_space[TLS_AAD_SPACE_SIZE];
102 unsigned int sg_plaintext_size;
103 int sg_plaintext_num_elem;
104 struct scatterlist sg_plaintext_data[MAX_SKB_FRAGS];
106 unsigned int sg_encrypted_size;
107 int sg_encrypted_num_elem;
108 struct scatterlist sg_encrypted_data[MAX_SKB_FRAGS];
110 /* AAD | sg_plaintext_data | sg_tag */
111 struct scatterlist sg_aead_in[2];
112 /* AAD | sg_encrypted_data (data contain overhead for hdr&iv&tag) */
113 struct scatterlist sg_aead_out[2];
116 struct tls_sw_context_rx {
117 struct crypto_aead *aead_recv;
118 struct crypto_wait async_wait;
120 struct strparser strp;
121 void (*saved_data_ready)(struct sock *sk);
122 unsigned int (*sk_poll)(struct file *file, struct socket *sock,
123 struct poll_table_struct *wait);
124 struct sk_buff *recv_pkt;
129 struct tls_record_info {
130 struct list_head list;
134 skb_frag_t frags[MAX_SKB_FRAGS];
137 struct tls_offload_context_tx {
138 struct crypto_aead *aead_send;
139 spinlock_t lock; /* protects records list */
140 struct list_head records_list;
141 struct tls_record_info *open_record;
142 struct tls_record_info *retransmit_hint;
144 u64 unacked_record_sn;
146 struct scatterlist sg_tx_data[MAX_SKB_FRAGS];
147 void (*sk_destruct)(struct sock *sk);
149 /* The TLS layer reserves room for driver specific state
150 * Currently the belief is that there is not enough
151 * driver specific state to justify another layer of indirection
153 #define TLS_DRIVER_STATE_SIZE (max_t(size_t, 8, sizeof(void *)))
156 #define TLS_OFFLOAD_CONTEXT_SIZE_TX \
157 (ALIGN(sizeof(struct tls_offload_context_tx), sizeof(void *)) + \
158 TLS_DRIVER_STATE_SIZE)
161 TLS_PENDING_CLOSED_RECORD
164 struct cipher_context {
174 union tls_crypto_context {
175 struct tls_crypto_info info;
176 struct tls12_crypto_info_aes_gcm_128 aes_gcm_128;
180 union tls_crypto_context crypto_send;
181 union tls_crypto_context crypto_recv;
183 struct list_head list;
184 struct net_device *netdev;
193 struct cipher_context tx;
194 struct cipher_context rx;
196 struct scatterlist *partially_sent_record;
197 u16 partially_sent_offset;
199 bool in_tcp_sendpages;
201 u16 pending_open_record_frags;
202 int (*push_pending_record)(struct sock *sk, int flags);
204 void (*sk_write_space)(struct sock *sk);
205 void (*sk_destruct)(struct sock *sk);
206 void (*sk_proto_close)(struct sock *sk, long timeout);
208 int (*setsockopt)(struct sock *sk, int level,
209 int optname, char __user *optval,
210 unsigned int optlen);
211 int (*getsockopt)(struct sock *sk, int level,
212 int optname, char __user *optval,
214 int (*hash)(struct sock *sk);
215 void (*unhash)(struct sock *sk);
218 struct tls_offload_context_rx {
219 /* sw must be the first member of tls_offload_context_rx */
220 struct tls_sw_context_rx sw;
221 atomic64_t resync_req;
223 /* The TLS layer reserves room for driver specific state
224 * Currently the belief is that there is not enough
225 * driver specific state to justify another layer of indirection
229 #define TLS_OFFLOAD_CONTEXT_SIZE_RX \
230 (ALIGN(sizeof(struct tls_offload_context_rx), sizeof(void *)) + \
231 TLS_DRIVER_STATE_SIZE)
233 int wait_on_pending_writer(struct sock *sk, long *timeo);
234 int tls_sk_query(struct sock *sk, int optname, char __user *optval,
236 int tls_sk_attach(struct sock *sk, int optname, char __user *optval,
237 unsigned int optlen);
239 int tls_set_sw_offload(struct sock *sk, struct tls_context *ctx, int tx);
240 int tls_sw_sendmsg(struct sock *sk, struct msghdr *msg, size_t size);
241 int tls_sw_sendpage(struct sock *sk, struct page *page,
242 int offset, size_t size, int flags);
243 void tls_sw_close(struct sock *sk, long timeout);
244 void tls_sw_free_resources_tx(struct sock *sk);
245 void tls_sw_free_resources_rx(struct sock *sk);
246 void tls_sw_release_resources_rx(struct sock *sk);
247 int tls_sw_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
248 int nonblock, int flags, int *addr_len);
249 unsigned int tls_sw_poll(struct file *file, struct socket *sock,
250 struct poll_table_struct *wait);
251 ssize_t tls_sw_splice_read(struct socket *sock, loff_t *ppos,
252 struct pipe_inode_info *pipe,
253 size_t len, unsigned int flags);
255 int tls_set_device_offload(struct sock *sk, struct tls_context *ctx);
256 int tls_device_sendmsg(struct sock *sk, struct msghdr *msg, size_t size);
257 int tls_device_sendpage(struct sock *sk, struct page *page,
258 int offset, size_t size, int flags);
259 void tls_device_sk_destruct(struct sock *sk);
260 void tls_device_init(void);
261 void tls_device_cleanup(void);
263 struct tls_record_info *tls_get_record(struct tls_offload_context_tx *context,
264 u32 seq, u64 *p_record_sn);
266 static inline bool tls_record_is_start_marker(struct tls_record_info *rec)
268 return rec->len == 0;
271 static inline u32 tls_record_start_seq(struct tls_record_info *rec)
273 return rec->end_seq - rec->len;
276 void tls_sk_destruct(struct sock *sk, struct tls_context *ctx);
277 int tls_push_sg(struct sock *sk, struct tls_context *ctx,
278 struct scatterlist *sg, u16 first_offset,
280 int tls_push_pending_closed_record(struct sock *sk, struct tls_context *ctx,
281 int flags, long *timeo);
283 static inline bool tls_is_pending_closed_record(struct tls_context *ctx)
285 return test_bit(TLS_PENDING_CLOSED_RECORD, &ctx->flags);
288 static inline int tls_complete_pending_work(struct sock *sk,
289 struct tls_context *ctx,
290 int flags, long *timeo)
294 if (unlikely(sk->sk_write_pending))
295 rc = wait_on_pending_writer(sk, timeo);
297 if (!rc && tls_is_pending_closed_record(ctx))
298 rc = tls_push_pending_closed_record(sk, ctx, flags, timeo);
303 static inline bool tls_is_partially_sent_record(struct tls_context *ctx)
305 return !!ctx->partially_sent_record;
308 static inline bool tls_is_pending_open_record(struct tls_context *tls_ctx)
310 return tls_ctx->pending_open_record_frags;
314 tls_validate_xmit_skb(struct sock *sk, struct net_device *dev,
315 struct sk_buff *skb);
317 static inline bool tls_is_sk_tx_device_offloaded(struct sock *sk)
319 #ifdef CONFIG_SOCK_VALIDATE_XMIT
320 return sk_fullsock(sk) &
321 (smp_load_acquire(&sk->sk_validate_xmit_skb) ==
322 &tls_validate_xmit_skb);
328 static inline void tls_err_abort(struct sock *sk, int err)
331 sk->sk_error_report(sk);
334 static inline bool tls_bigint_increment(unsigned char *seq, int len)
338 for (i = len - 1; i >= 0; i--) {
347 static inline void tls_advance_record_sn(struct sock *sk,
348 struct cipher_context *ctx)
350 if (tls_bigint_increment(ctx->rec_seq, ctx->rec_seq_size))
351 tls_err_abort(sk, EBADMSG);
352 tls_bigint_increment(ctx->iv + TLS_CIPHER_AES_GCM_128_SALT_SIZE,
356 static inline void tls_fill_prepend(struct tls_context *ctx,
358 size_t plaintext_len,
359 unsigned char record_type)
361 size_t pkt_len, iv_size = ctx->tx.iv_size;
363 pkt_len = plaintext_len + iv_size + ctx->tx.tag_size;
365 /* we cover nonce explicit here as well, so buf should be of
366 * size KTLS_DTLS_HEADER_SIZE + KTLS_DTLS_NONCE_EXPLICIT_SIZE
368 buf[0] = record_type;
369 buf[1] = TLS_VERSION_MINOR(ctx->crypto_send.info.version);
370 buf[2] = TLS_VERSION_MAJOR(ctx->crypto_send.info.version);
371 /* we can use IV for nonce explicit according to spec */
372 buf[3] = pkt_len >> 8;
373 buf[4] = pkt_len & 0xFF;
374 memcpy(buf + TLS_NONCE_OFFSET,
375 ctx->tx.iv + TLS_CIPHER_AES_GCM_128_SALT_SIZE, iv_size);
378 static inline void tls_make_aad(char *buf,
380 char *record_sequence,
381 int record_sequence_size,
382 unsigned char record_type)
384 memcpy(buf, record_sequence, record_sequence_size);
386 buf[8] = record_type;
387 buf[9] = TLS_1_2_VERSION_MAJOR;
388 buf[10] = TLS_1_2_VERSION_MINOR;
390 buf[12] = size & 0xFF;
393 static inline struct tls_context *tls_get_ctx(const struct sock *sk)
395 struct inet_connection_sock *icsk = inet_csk(sk);
397 return icsk->icsk_ulp_data;
400 static inline struct tls_sw_context_rx *tls_sw_ctx_rx(
401 const struct tls_context *tls_ctx)
403 return (struct tls_sw_context_rx *)tls_ctx->priv_ctx_rx;
406 static inline struct tls_sw_context_tx *tls_sw_ctx_tx(
407 const struct tls_context *tls_ctx)
409 return (struct tls_sw_context_tx *)tls_ctx->priv_ctx_tx;
412 static inline struct tls_offload_context_tx *
413 tls_offload_ctx_tx(const struct tls_context *tls_ctx)
415 return (struct tls_offload_context_tx *)tls_ctx->priv_ctx_tx;
418 static inline struct tls_offload_context_rx *
419 tls_offload_ctx_rx(const struct tls_context *tls_ctx)
421 return (struct tls_offload_context_rx *)tls_ctx->priv_ctx_rx;
424 /* The TLS context is valid until sk_destruct is called */
425 static inline void tls_offload_rx_resync_request(struct sock *sk, __be32 seq)
427 struct tls_context *tls_ctx = tls_get_ctx(sk);
428 struct tls_offload_context_rx *rx_ctx = tls_offload_ctx_rx(tls_ctx);
430 atomic64_set(&rx_ctx->resync_req, ((((uint64_t)seq) << 32) | 1));
434 int tls_proccess_cmsg(struct sock *sk, struct msghdr *msg,
435 unsigned char *record_type);
436 void tls_register_device(struct tls_device *device);
437 void tls_unregister_device(struct tls_device *device);
438 int tls_device_decrypted(struct sock *sk, struct sk_buff *skb);
439 int decrypt_skb(struct sock *sk, struct sk_buff *skb,
440 struct scatterlist *sgout);
442 struct sk_buff *tls_validate_xmit_skb(struct sock *sk,
443 struct net_device *dev,
444 struct sk_buff *skb);
446 int tls_sw_fallback_init(struct sock *sk,
447 struct tls_offload_context_tx *offload_ctx,
448 struct tls_crypto_info *crypto_info);
450 int tls_set_device_offload_rx(struct sock *sk, struct tls_context *ctx);
452 void tls_device_offload_cleanup_rx(struct sock *sk);
453 void handle_device_resync(struct sock *sk, u32 seq, u64 rcd_sn);
455 #endif /* _TLS_OFFLOAD_H */