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3c4d7559 DW |
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> | |
b9f3eb49 | 38 | #include <asm/byteorder.h> |
a54667f6 | 39 | #include <linux/crypto.h> |
b9f3eb49 DL |
40 | #include <linux/socket.h> |
41 | #include <linux/tcp.h> | |
d829e9c4 | 42 | #include <linux/skmsg.h> |
79ffe608 | 43 | #include <linux/mutex.h> |
2e361176 | 44 | #include <linux/netdevice.h> |
15a7dea7 | 45 | #include <linux/rcupdate.h> |
d829e9c4 | 46 | |
d26b698d | 47 | #include <net/net_namespace.h> |
b9f3eb49 | 48 | #include <net/tcp.h> |
c46234eb | 49 | #include <net/strparser.h> |
a42055e8 | 50 | #include <crypto/aead.h> |
3c4d7559 DW |
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 | |
dd0bed16 | 65 | |
f295b3ae | 66 | #define MAX_IV_SIZE 16 |
89fec474 | 67 | #define TLS_MAX_REC_SEQ_SIZE 8 |
f295b3ae | 68 | |
128cfb88 | 69 | /* For CCM mode, the full 16-bytes of IV is made of '4' fields of given sizes. |
f295b3ae VG |
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 | |
128cfb88 | 77 | #define TLS_SM4_CCM_IV_B0_BYTE 2 |
f295b3ae | 78 | |
d26b698d JK |
79 | #define __TLS_INC_STATS(net, field) \ |
80 | __SNMP_INC_STATS((net)->mib.tls_statistics, field) | |
81 | #define TLS_INC_STATS(net, field) \ | |
82 | SNMP_INC_STATS((net)->mib.tls_statistics, field) | |
d26b698d JK |
83 | #define TLS_DEC_STATS(net, field) \ |
84 | SNMP_DEC_STATS((net)->mib.tls_statistics, field) | |
85 | ||
4799ac81 BP |
86 | enum { |
87 | TLS_BASE, | |
88 | TLS_SW, | |
4799ac81 | 89 | TLS_HW, |
4799ac81 BP |
90 | TLS_HW_RECORD, |
91 | TLS_NUM_CONFIG, | |
92 | }; | |
93 | ||
a42055e8 VG |
94 | /* TLS records are maintained in 'struct tls_rec'. It stores the memory pages |
95 | * allocated or mapped for each TLS record. After encryption, the records are | |
96 | * stores in a linked list. | |
97 | */ | |
98 | struct tls_rec { | |
99 | struct list_head list; | |
9932a29a | 100 | int tx_ready; |
a42055e8 | 101 | int tx_flags; |
3c4d7559 | 102 | |
d829e9c4 DB |
103 | struct sk_msg msg_plaintext; |
104 | struct sk_msg msg_encrypted; | |
a42055e8 | 105 | |
d829e9c4 DB |
106 | /* AAD | msg_plaintext.sg.data | sg_tag */ |
107 | struct scatterlist sg_aead_in[2]; | |
108 | /* AAD | msg_encrypted.sg.data (data contains overhead for hdr & iv & tag) */ | |
109 | struct scatterlist sg_aead_out[2]; | |
a42055e8 | 110 | |
130b392c DW |
111 | char content_type; |
112 | struct scatterlist sg_content_type; | |
113 | ||
a42055e8 | 114 | char aad_space[TLS_AAD_SPACE_SIZE]; |
f295b3ae | 115 | u8 iv_data[MAX_IV_SIZE]; |
a42055e8 VG |
116 | struct aead_request aead_req; |
117 | u8 aead_req_ctx[]; | |
118 | }; | |
119 | ||
2b794c40 VG |
120 | struct tls_msg { |
121 | struct strp_msg rxm; | |
122 | u8 control; | |
123 | }; | |
124 | ||
a42055e8 VG |
125 | struct tx_work { |
126 | struct delayed_work work; | |
127 | struct sock *sk; | |
128 | }; | |
129 | ||
130 | struct tls_sw_context_tx { | |
131 | struct crypto_aead *aead_send; | |
132 | struct crypto_wait async_wait; | |
133 | struct tx_work tx_work; | |
134 | struct tls_rec *open_rec; | |
9932a29a | 135 | struct list_head tx_list; |
a42055e8 | 136 | atomic_t encrypt_pending; |
0cada332 VKY |
137 | /* protect crypto_wait with encrypt_pending */ |
138 | spinlock_t encrypt_compl_lock; | |
a42055e8 | 139 | int async_notify; |
5c5458ec | 140 | u8 async_capable:1; |
a42055e8 VG |
141 | |
142 | #define BIT_TX_SCHEDULED 0 | |
f87e62d4 | 143 | #define BIT_TX_CLOSING 1 |
a42055e8 | 144 | unsigned long tx_bitmask; |
3c4d7559 DW |
145 | }; |
146 | ||
f66de3ee BP |
147 | struct tls_sw_context_rx { |
148 | struct crypto_aead *aead_recv; | |
149 | struct crypto_wait async_wait; | |
f66de3ee | 150 | struct strparser strp; |
692d7b5d | 151 | struct sk_buff_head rx_list; /* list of decrypted 'data' records */ |
f66de3ee | 152 | void (*saved_data_ready)(struct sock *sk); |
924ad65e | 153 | |
f66de3ee BP |
154 | struct sk_buff *recv_pkt; |
155 | u8 control; | |
5c5458ec | 156 | u8 async_capable:1; |
bc76e5bb | 157 | u8 decrypted:1; |
94524d8f | 158 | atomic_t decrypt_pending; |
0cada332 VKY |
159 | /* protect crypto_wait with decrypt_pending*/ |
160 | spinlock_t decrypt_compl_lock; | |
94524d8f VG |
161 | bool async_notify; |
162 | }; | |
163 | ||
e8f69799 IL |
164 | struct tls_record_info { |
165 | struct list_head list; | |
166 | u32 end_seq; | |
167 | int len; | |
168 | int num_frags; | |
169 | skb_frag_t frags[MAX_SKB_FRAGS]; | |
170 | }; | |
171 | ||
d80a1b9d | 172 | struct tls_offload_context_tx { |
e8f69799 IL |
173 | struct crypto_aead *aead_send; |
174 | spinlock_t lock; /* protects records list */ | |
175 | struct list_head records_list; | |
176 | struct tls_record_info *open_record; | |
177 | struct tls_record_info *retransmit_hint; | |
178 | u64 hint_record_sn; | |
179 | u64 unacked_record_sn; | |
180 | ||
181 | struct scatterlist sg_tx_data[MAX_SKB_FRAGS]; | |
182 | void (*sk_destruct)(struct sock *sk); | |
2e361176 | 183 | u8 driver_state[] __aligned(8); |
e8f69799 IL |
184 | /* The TLS layer reserves room for driver specific state |
185 | * Currently the belief is that there is not enough | |
186 | * driver specific state to justify another layer of indirection | |
187 | */ | |
2d6b51c6 | 188 | #define TLS_DRIVER_STATE_SIZE_TX 16 |
e8f69799 IL |
189 | }; |
190 | ||
d80a1b9d | 191 | #define TLS_OFFLOAD_CONTEXT_SIZE_TX \ |
2e361176 | 192 | (sizeof(struct tls_offload_context_tx) + TLS_DRIVER_STATE_SIZE_TX) |
e8f69799 | 193 | |
e52972c1 | 194 | enum tls_context_flags { |
c55dcdd4 MM |
195 | /* tls_device_down was called after the netdev went down, device state |
196 | * was released, and kTLS works in software, even though rx_conf is | |
197 | * still TLS_HW (needed for transition). | |
198 | */ | |
199 | TLS_RX_DEV_DEGRADED = 0, | |
50180074 JK |
200 | /* Unlike RX where resync is driven entirely by the core in TX only |
201 | * the driver knows when things went out of sync, so we need the flag | |
202 | * to be atomic. | |
203 | */ | |
204 | TLS_TX_SYNC_SCHED = 1, | |
025cc2fb MM |
205 | /* tls_dev_del was called for the RX side, device state was released, |
206 | * but tls_ctx->netdev might still be kept, because TX-side driver | |
207 | * resources might not be released yet. Used to prevent the second | |
208 | * tls_dev_del call in tls_device_down if it happens simultaneously. | |
209 | */ | |
210 | TLS_RX_DEV_CLOSED = 2, | |
e52972c1 JK |
211 | }; |
212 | ||
dbe42559 | 213 | struct cipher_context { |
dbe42559 | 214 | char *iv; |
dbe42559 DW |
215 | char *rec_seq; |
216 | }; | |
217 | ||
86029d10 SD |
218 | union tls_crypto_context { |
219 | struct tls_crypto_info info; | |
fb99bce7 DW |
220 | union { |
221 | struct tls12_crypto_info_aes_gcm_128 aes_gcm_128; | |
222 | struct tls12_crypto_info_aes_gcm_256 aes_gcm_256; | |
923c40c4 | 223 | struct tls12_crypto_info_chacha20_poly1305 chacha20_poly1305; |
39d8fb96 TZ |
224 | struct tls12_crypto_info_sm4_gcm sm4_gcm; |
225 | struct tls12_crypto_info_sm4_ccm sm4_ccm; | |
fb99bce7 | 226 | }; |
86029d10 SD |
227 | }; |
228 | ||
4509de14 VG |
229 | struct tls_prot_info { |
230 | u16 version; | |
231 | u16 cipher_type; | |
232 | u16 prepend_size; | |
233 | u16 tag_size; | |
234 | u16 overhead_size; | |
235 | u16 iv_size; | |
f295b3ae | 236 | u16 salt_size; |
4509de14 VG |
237 | u16 rec_seq_size; |
238 | u16 aad_size; | |
239 | u16 tail_size; | |
240 | }; | |
241 | ||
3c4d7559 | 242 | struct tls_context { |
f0aaa2c9 | 243 | /* read-only cache line */ |
4509de14 VG |
244 | struct tls_prot_info prot_info; |
245 | ||
f0aaa2c9 JK |
246 | u8 tx_conf:3; |
247 | u8 rx_conf:3; | |
3c4d7559 | 248 | |
f0aaa2c9 JK |
249 | int (*push_pending_record)(struct sock *sk, int flags); |
250 | void (*sk_write_space)(struct sock *sk); | |
f66de3ee BP |
251 | |
252 | void *priv_ctx_tx; | |
253 | void *priv_ctx_rx; | |
3c4d7559 | 254 | |
f0aaa2c9 | 255 | struct net_device *netdev; |
6d88207f | 256 | |
f0aaa2c9 | 257 | /* rw cache line */ |
dbe42559 | 258 | struct cipher_context tx; |
c46234eb | 259 | struct cipher_context rx; |
3c4d7559 DW |
260 | |
261 | struct scatterlist *partially_sent_record; | |
262 | u16 partially_sent_offset; | |
a42055e8 | 263 | |
c212d2c7 | 264 | bool in_tcp_sendpages; |
d829e9c4 | 265 | bool pending_open_record_frags; |
79ffe608 JK |
266 | |
267 | struct mutex tx_lock; /* protects partially_sent_* fields and | |
268 | * per-type TX fields | |
269 | */ | |
f0aaa2c9 | 270 | unsigned long flags; |
3c4d7559 | 271 | |
f0aaa2c9 | 272 | /* cache cold stuff */ |
32857cf5 | 273 | struct proto *sk_proto; |
c55dcdd4 | 274 | struct sock *sk; |
32857cf5 | 275 | |
4799ac81 | 276 | void (*sk_destruct)(struct sock *sk); |
f0aaa2c9 JK |
277 | |
278 | union tls_crypto_context crypto_send; | |
279 | union tls_crypto_context crypto_recv; | |
280 | ||
281 | struct list_head list; | |
282 | refcount_t refcount; | |
15a7dea7 | 283 | struct rcu_head rcu; |
3c4d7559 DW |
284 | }; |
285 | ||
da68b4ad JK |
286 | enum tls_offload_ctx_dir { |
287 | TLS_OFFLOAD_CTX_DIR_RX, | |
288 | TLS_OFFLOAD_CTX_DIR_TX, | |
289 | }; | |
290 | ||
291 | struct tlsdev_ops { | |
292 | int (*tls_dev_add)(struct net_device *netdev, struct sock *sk, | |
293 | enum tls_offload_ctx_dir direction, | |
294 | struct tls_crypto_info *crypto_info, | |
295 | u32 start_offload_tcp_sn); | |
296 | void (*tls_dev_del)(struct net_device *netdev, | |
297 | struct tls_context *ctx, | |
298 | enum tls_offload_ctx_dir direction); | |
b5d9a834 DM |
299 | int (*tls_dev_resync)(struct net_device *netdev, |
300 | struct sock *sk, u32 seq, u8 *rcd_sn, | |
301 | enum tls_offload_ctx_dir direction); | |
da68b4ad JK |
302 | }; |
303 | ||
f953d33b JK |
304 | enum tls_offload_sync_type { |
305 | TLS_OFFLOAD_SYNC_TYPE_DRIVER_REQ = 0, | |
306 | TLS_OFFLOAD_SYNC_TYPE_CORE_NEXT_HINT = 1, | |
ed9b7646 | 307 | TLS_OFFLOAD_SYNC_TYPE_DRIVER_REQ_ASYNC = 2, |
f953d33b JK |
308 | }; |
309 | ||
310 | #define TLS_DEVICE_RESYNC_NH_START_IVAL 2 | |
311 | #define TLS_DEVICE_RESYNC_NH_MAX_IVAL 128 | |
312 | ||
ed9b7646 BP |
313 | #define TLS_DEVICE_RESYNC_ASYNC_LOGMAX 13 |
314 | struct tls_offload_resync_async { | |
315 | atomic64_t req; | |
138559b9 TT |
316 | u16 loglen; |
317 | u16 rcd_delta; | |
ed9b7646 BP |
318 | u32 log[TLS_DEVICE_RESYNC_ASYNC_LOGMAX]; |
319 | }; | |
320 | ||
4799ac81 BP |
321 | struct tls_offload_context_rx { |
322 | /* sw must be the first member of tls_offload_context_rx */ | |
323 | struct tls_sw_context_rx sw; | |
f953d33b JK |
324 | enum tls_offload_sync_type resync_type; |
325 | /* this member is set regardless of resync_type, to avoid branches */ | |
326 | u8 resync_nh_reset:1; | |
327 | /* CORE_NEXT_HINT-only member, but use the hole here */ | |
328 | u8 resync_nh_do_now:1; | |
329 | union { | |
330 | /* TLS_OFFLOAD_SYNC_TYPE_DRIVER_REQ */ | |
331 | struct { | |
332 | atomic64_t resync_req; | |
333 | }; | |
334 | /* TLS_OFFLOAD_SYNC_TYPE_CORE_NEXT_HINT */ | |
335 | struct { | |
336 | u32 decrypted_failed; | |
337 | u32 decrypted_tgt; | |
338 | } resync_nh; | |
ed9b7646 BP |
339 | /* TLS_OFFLOAD_SYNC_TYPE_DRIVER_REQ_ASYNC */ |
340 | struct { | |
341 | struct tls_offload_resync_async *resync_async; | |
342 | }; | |
f953d33b | 343 | }; |
2e361176 | 344 | u8 driver_state[] __aligned(8); |
4799ac81 BP |
345 | /* The TLS layer reserves room for driver specific state |
346 | * Currently the belief is that there is not enough | |
347 | * driver specific state to justify another layer of indirection | |
348 | */ | |
2d6b51c6 | 349 | #define TLS_DRIVER_STATE_SIZE_RX 8 |
4799ac81 BP |
350 | }; |
351 | ||
352 | #define TLS_OFFLOAD_CONTEXT_SIZE_RX \ | |
2e361176 | 353 | (sizeof(struct tls_offload_context_rx) + TLS_DRIVER_STATE_SIZE_RX) |
4799ac81 | 354 | |
08700dab | 355 | struct tls_context *tls_ctx_create(struct sock *sk); |
15a7dea7 | 356 | void tls_ctx_free(struct sock *sk, struct tls_context *ctx); |
08700dab JK |
357 | void update_sk_prot(struct sock *sk, struct tls_context *ctx); |
358 | ||
3c4d7559 DW |
359 | int wait_on_pending_writer(struct sock *sk, long *timeo); |
360 | int tls_sk_query(struct sock *sk, int optname, char __user *optval, | |
361 | int __user *optlen); | |
362 | int tls_sk_attach(struct sock *sk, int optname, char __user *optval, | |
363 | unsigned int optlen); | |
da353fac | 364 | void tls_err_abort(struct sock *sk, int err); |
3c4d7559 | 365 | |
c46234eb | 366 | int tls_set_sw_offload(struct sock *sk, struct tls_context *ctx, int tx); |
318892ac | 367 | void tls_sw_strparser_arm(struct sock *sk, struct tls_context *ctx); |
313ab004 | 368 | void tls_sw_strparser_done(struct tls_context *tls_ctx); |
3c4d7559 | 369 | int tls_sw_sendmsg(struct sock *sk, struct msghdr *msg, size_t size); |
d4ffb02d WB |
370 | int tls_sw_sendpage_locked(struct sock *sk, struct page *page, |
371 | int offset, size_t size, int flags); | |
3c4d7559 DW |
372 | int tls_sw_sendpage(struct sock *sk, struct page *page, |
373 | int offset, size_t size, int flags); | |
f87e62d4 | 374 | void tls_sw_cancel_work_tx(struct tls_context *tls_ctx); |
313ab004 JF |
375 | void tls_sw_release_resources_tx(struct sock *sk); |
376 | void tls_sw_free_ctx_tx(struct tls_context *tls_ctx); | |
f66de3ee | 377 | void tls_sw_free_resources_rx(struct sock *sk); |
39f56e1a | 378 | void tls_sw_release_resources_rx(struct sock *sk); |
313ab004 | 379 | void tls_sw_free_ctx_rx(struct tls_context *tls_ctx); |
c46234eb DW |
380 | int tls_sw_recvmsg(struct sock *sk, struct msghdr *msg, size_t len, |
381 | int nonblock, int flags, int *addr_len); | |
7b50ecfc | 382 | bool tls_sw_sock_is_readable(struct sock *sk); |
c46234eb DW |
383 | ssize_t tls_sw_splice_read(struct socket *sock, loff_t *ppos, |
384 | struct pipe_inode_info *pipe, | |
385 | size_t len, unsigned int flags); | |
3c4d7559 | 386 | |
e8f69799 IL |
387 | int tls_device_sendmsg(struct sock *sk, struct msghdr *msg, size_t size); |
388 | int tls_device_sendpage(struct sock *sk, struct page *page, | |
389 | int offset, size_t size, int flags); | |
a42055e8 | 390 | int tls_tx_records(struct sock *sk, int flags); |
e8f69799 | 391 | |
d80a1b9d | 392 | struct tls_record_info *tls_get_record(struct tls_offload_context_tx *context, |
e8f69799 IL |
393 | u32 seq, u64 *p_record_sn); |
394 | ||
395 | static inline bool tls_record_is_start_marker(struct tls_record_info *rec) | |
396 | { | |
397 | return rec->len == 0; | |
398 | } | |
399 | ||
400 | static inline u32 tls_record_start_seq(struct tls_record_info *rec) | |
401 | { | |
402 | return rec->end_seq - rec->len; | |
403 | } | |
3c4d7559 DW |
404 | |
405 | int tls_push_sg(struct sock *sk, struct tls_context *ctx, | |
406 | struct scatterlist *sg, u16 first_offset, | |
407 | int flags); | |
a42055e8 VG |
408 | int tls_push_partial_record(struct sock *sk, struct tls_context *ctx, |
409 | int flags); | |
c5daa6cc | 410 | void tls_free_partial_record(struct sock *sk, struct tls_context *ctx); |
a42055e8 | 411 | |
2b794c40 VG |
412 | static inline struct tls_msg *tls_msg(struct sk_buff *skb) |
413 | { | |
414 | return (struct tls_msg *)strp_msg(skb); | |
415 | } | |
416 | ||
94850257 | 417 | static inline bool tls_is_partially_sent_record(struct tls_context *ctx) |
3c4d7559 | 418 | { |
94850257 | 419 | return !!ctx->partially_sent_record; |
3c4d7559 DW |
420 | } |
421 | ||
3c4d7559 DW |
422 | static inline bool tls_is_pending_open_record(struct tls_context *tls_ctx) |
423 | { | |
424 | return tls_ctx->pending_open_record_frags; | |
425 | } | |
426 | ||
9932a29a | 427 | static inline bool is_tx_ready(struct tls_sw_context_tx *ctx) |
a42055e8 VG |
428 | { |
429 | struct tls_rec *rec; | |
a42055e8 | 430 | |
9932a29a | 431 | rec = list_first_entry(&ctx->tx_list, struct tls_rec, list); |
a42055e8 VG |
432 | if (!rec) |
433 | return false; | |
434 | ||
9932a29a | 435 | return READ_ONCE(rec->tx_ready); |
a42055e8 VG |
436 | } |
437 | ||
26811cc9 DC |
438 | static inline u16 tls_user_config(struct tls_context *ctx, bool tx) |
439 | { | |
440 | u16 config = tx ? ctx->tx_conf : ctx->rx_conf; | |
441 | ||
442 | switch (config) { | |
443 | case TLS_BASE: | |
444 | return TLS_CONF_BASE; | |
445 | case TLS_SW: | |
446 | return TLS_CONF_SW; | |
447 | case TLS_HW: | |
448 | return TLS_CONF_HW; | |
449 | case TLS_HW_RECORD: | |
450 | return TLS_CONF_HW_RECORD; | |
451 | } | |
452 | return 0; | |
453 | } | |
454 | ||
4799ac81 BP |
455 | struct sk_buff * |
456 | tls_validate_xmit_skb(struct sock *sk, struct net_device *dev, | |
457 | struct sk_buff *skb); | |
c55dcdd4 MM |
458 | struct sk_buff * |
459 | tls_validate_xmit_skb_sw(struct sock *sk, struct net_device *dev, | |
460 | struct sk_buff *skb); | |
4799ac81 | 461 | |
e8f69799 IL |
462 | static inline bool tls_is_sk_tx_device_offloaded(struct sock *sk) |
463 | { | |
4799ac81 | 464 | #ifdef CONFIG_SOCK_VALIDATE_XMIT |
b4f47f38 | 465 | return sk_fullsock(sk) && |
4799ac81 BP |
466 | (smp_load_acquire(&sk->sk_validate_xmit_skb) == |
467 | &tls_validate_xmit_skb); | |
468 | #else | |
469 | return false; | |
470 | #endif | |
e8f69799 IL |
471 | } |
472 | ||
3c4d7559 DW |
473 | static inline bool tls_bigint_increment(unsigned char *seq, int len) |
474 | { | |
475 | int i; | |
476 | ||
477 | for (i = len - 1; i >= 0; i--) { | |
478 | ++seq[i]; | |
479 | if (seq[i] != 0) | |
480 | break; | |
481 | } | |
482 | ||
483 | return (i == -1); | |
484 | } | |
485 | ||
138559b9 TT |
486 | static inline void tls_bigint_subtract(unsigned char *seq, int n) |
487 | { | |
488 | u64 rcd_sn; | |
489 | __be64 *p; | |
490 | ||
491 | BUILD_BUG_ON(TLS_MAX_REC_SEQ_SIZE != 8); | |
492 | ||
493 | p = (__be64 *)seq; | |
494 | rcd_sn = be64_to_cpu(*p); | |
495 | *p = cpu_to_be64(rcd_sn - n); | |
496 | } | |
497 | ||
4509de14 VG |
498 | static inline struct tls_context *tls_get_ctx(const struct sock *sk) |
499 | { | |
500 | struct inet_connection_sock *icsk = inet_csk(sk); | |
501 | ||
15a7dea7 JK |
502 | /* Use RCU on icsk_ulp_data only for sock diag code, |
503 | * TLS data path doesn't need rcu_dereference(). | |
504 | */ | |
505 | return (__force void *)icsk->icsk_ulp_data; | |
4509de14 VG |
506 | } |
507 | ||
3c4d7559 | 508 | static inline void tls_advance_record_sn(struct sock *sk, |
fb0f886f JK |
509 | struct tls_prot_info *prot, |
510 | struct cipher_context *ctx) | |
3c4d7559 | 511 | { |
4509de14 | 512 | if (tls_bigint_increment(ctx->rec_seq, prot->rec_seq_size)) |
da353fac | 513 | tls_err_abort(sk, -EBADMSG); |
130b392c | 514 | |
a6acbe62 VF |
515 | if (prot->version != TLS_1_3_VERSION && |
516 | prot->cipher_type != TLS_CIPHER_CHACHA20_POLY1305) | |
6942a284 | 517 | tls_bigint_increment(ctx->iv + prot->salt_size, |
4509de14 | 518 | prot->iv_size); |
3c4d7559 DW |
519 | } |
520 | ||
521 | static inline void tls_fill_prepend(struct tls_context *ctx, | |
522 | char *buf, | |
523 | size_t plaintext_len, | |
6942a284 | 524 | unsigned char record_type) |
3c4d7559 | 525 | { |
4509de14 VG |
526 | struct tls_prot_info *prot = &ctx->prot_info; |
527 | size_t pkt_len, iv_size = prot->iv_size; | |
3c4d7559 | 528 | |
4509de14 | 529 | pkt_len = plaintext_len + prot->tag_size; |
a6acbe62 VF |
530 | if (prot->version != TLS_1_3_VERSION && |
531 | prot->cipher_type != TLS_CIPHER_CHACHA20_POLY1305) { | |
130b392c DW |
532 | pkt_len += iv_size; |
533 | ||
534 | memcpy(buf + TLS_NONCE_OFFSET, | |
6942a284 | 535 | ctx->tx.iv + prot->salt_size, iv_size); |
130b392c | 536 | } |
3c4d7559 DW |
537 | |
538 | /* we cover nonce explicit here as well, so buf should be of | |
539 | * size KTLS_DTLS_HEADER_SIZE + KTLS_DTLS_NONCE_EXPLICIT_SIZE | |
540 | */ | |
6942a284 | 541 | buf[0] = prot->version == TLS_1_3_VERSION ? |
130b392c DW |
542 | TLS_RECORD_TYPE_DATA : record_type; |
543 | /* Note that VERSION must be TLS_1_2 for both TLS1.2 and TLS1.3 */ | |
544 | buf[1] = TLS_1_2_VERSION_MINOR; | |
545 | buf[2] = TLS_1_2_VERSION_MAJOR; | |
3c4d7559 DW |
546 | /* we can use IV for nonce explicit according to spec */ |
547 | buf[3] = pkt_len >> 8; | |
548 | buf[4] = pkt_len & 0xFF; | |
3c4d7559 DW |
549 | } |
550 | ||
213ef6e7 IL |
551 | static inline void tls_make_aad(char *buf, |
552 | size_t size, | |
553 | char *record_sequence, | |
130b392c | 554 | unsigned char record_type, |
6942a284 | 555 | struct tls_prot_info *prot) |
130b392c | 556 | { |
6942a284 VF |
557 | if (prot->version != TLS_1_3_VERSION) { |
558 | memcpy(buf, record_sequence, prot->rec_seq_size); | |
130b392c DW |
559 | buf += 8; |
560 | } else { | |
6942a284 | 561 | size += prot->tag_size; |
130b392c DW |
562 | } |
563 | ||
6942a284 | 564 | buf[0] = prot->version == TLS_1_3_VERSION ? |
130b392c DW |
565 | TLS_RECORD_TYPE_DATA : record_type; |
566 | buf[1] = TLS_1_2_VERSION_MAJOR; | |
567 | buf[2] = TLS_1_2_VERSION_MINOR; | |
568 | buf[3] = size >> 8; | |
569 | buf[4] = size & 0xFF; | |
570 | } | |
571 | ||
6942a284 | 572 | static inline void xor_iv_with_seq(struct tls_prot_info *prot, char *iv, char *seq) |
213ef6e7 | 573 | { |
130b392c | 574 | int i; |
213ef6e7 | 575 | |
a6acbe62 VF |
576 | if (prot->version == TLS_1_3_VERSION || |
577 | prot->cipher_type == TLS_CIPHER_CHACHA20_POLY1305) { | |
130b392c DW |
578 | for (i = 0; i < 8; i++) |
579 | iv[i + 4] ^= seq[i]; | |
580 | } | |
213ef6e7 IL |
581 | } |
582 | ||
3c4d7559 | 583 | |
f66de3ee BP |
584 | static inline struct tls_sw_context_rx *tls_sw_ctx_rx( |
585 | const struct tls_context *tls_ctx) | |
586 | { | |
587 | return (struct tls_sw_context_rx *)tls_ctx->priv_ctx_rx; | |
588 | } | |
589 | ||
590 | static inline struct tls_sw_context_tx *tls_sw_ctx_tx( | |
3c4d7559 DW |
591 | const struct tls_context *tls_ctx) |
592 | { | |
f66de3ee | 593 | return (struct tls_sw_context_tx *)tls_ctx->priv_ctx_tx; |
3c4d7559 DW |
594 | } |
595 | ||
d80a1b9d BP |
596 | static inline struct tls_offload_context_tx * |
597 | tls_offload_ctx_tx(const struct tls_context *tls_ctx) | |
3c4d7559 | 598 | { |
d80a1b9d | 599 | return (struct tls_offload_context_tx *)tls_ctx->priv_ctx_tx; |
3c4d7559 DW |
600 | } |
601 | ||
0608c69c JF |
602 | static inline bool tls_sw_has_ctx_tx(const struct sock *sk) |
603 | { | |
604 | struct tls_context *ctx = tls_get_ctx(sk); | |
605 | ||
606 | if (!ctx) | |
607 | return false; | |
608 | return !!tls_sw_ctx_tx(ctx); | |
609 | } | |
610 | ||
e91de6af JF |
611 | static inline bool tls_sw_has_ctx_rx(const struct sock *sk) |
612 | { | |
613 | struct tls_context *ctx = tls_get_ctx(sk); | |
614 | ||
615 | if (!ctx) | |
616 | return false; | |
617 | return !!tls_sw_ctx_rx(ctx); | |
618 | } | |
619 | ||
7463d3a2 BP |
620 | void tls_sw_write_space(struct sock *sk, struct tls_context *ctx); |
621 | void tls_device_write_space(struct sock *sk, struct tls_context *ctx); | |
622 | ||
4799ac81 BP |
623 | static inline struct tls_offload_context_rx * |
624 | tls_offload_ctx_rx(const struct tls_context *tls_ctx) | |
625 | { | |
626 | return (struct tls_offload_context_rx *)tls_ctx->priv_ctx_rx; | |
627 | } | |
628 | ||
2e361176 JK |
629 | #if IS_ENABLED(CONFIG_TLS_DEVICE) |
630 | static inline void *__tls_driver_ctx(struct tls_context *tls_ctx, | |
631 | enum tls_offload_ctx_dir direction) | |
632 | { | |
633 | if (direction == TLS_OFFLOAD_CTX_DIR_TX) | |
634 | return tls_offload_ctx_tx(tls_ctx)->driver_state; | |
635 | else | |
636 | return tls_offload_ctx_rx(tls_ctx)->driver_state; | |
637 | } | |
638 | ||
639 | static inline void * | |
640 | tls_driver_ctx(const struct sock *sk, enum tls_offload_ctx_dir direction) | |
641 | { | |
642 | return __tls_driver_ctx(tls_get_ctx(sk), direction); | |
643 | } | |
644 | #endif | |
645 | ||
ed9b7646 BP |
646 | #define RESYNC_REQ BIT(0) |
647 | #define RESYNC_REQ_ASYNC BIT(1) | |
4799ac81 BP |
648 | /* The TLS context is valid until sk_destruct is called */ |
649 | static inline void tls_offload_rx_resync_request(struct sock *sk, __be32 seq) | |
650 | { | |
651 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
652 | struct tls_offload_context_rx *rx_ctx = tls_offload_ctx_rx(tls_ctx); | |
653 | ||
ed9b7646 BP |
654 | atomic64_set(&rx_ctx->resync_req, ((u64)ntohl(seq) << 32) | RESYNC_REQ); |
655 | } | |
656 | ||
657 | /* Log all TLS record header TCP sequences in [seq, seq+len] */ | |
658 | static inline void | |
659 | tls_offload_rx_resync_async_request_start(struct sock *sk, __be32 seq, u16 len) | |
660 | { | |
661 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
662 | struct tls_offload_context_rx *rx_ctx = tls_offload_ctx_rx(tls_ctx); | |
663 | ||
664 | atomic64_set(&rx_ctx->resync_async->req, ((u64)ntohl(seq) << 32) | | |
a6ed3ebc | 665 | ((u64)len << 16) | RESYNC_REQ | RESYNC_REQ_ASYNC); |
ed9b7646 | 666 | rx_ctx->resync_async->loglen = 0; |
138559b9 | 667 | rx_ctx->resync_async->rcd_delta = 0; |
ed9b7646 BP |
668 | } |
669 | ||
670 | static inline void | |
671 | tls_offload_rx_resync_async_request_end(struct sock *sk, __be32 seq) | |
672 | { | |
673 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
674 | struct tls_offload_context_rx *rx_ctx = tls_offload_ctx_rx(tls_ctx); | |
675 | ||
676 | atomic64_set(&rx_ctx->resync_async->req, | |
677 | ((u64)ntohl(seq) << 32) | RESYNC_REQ); | |
4799ac81 BP |
678 | } |
679 | ||
f953d33b JK |
680 | static inline void |
681 | tls_offload_rx_resync_set_type(struct sock *sk, enum tls_offload_sync_type type) | |
682 | { | |
683 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
684 | ||
685 | tls_offload_ctx_rx(tls_ctx)->resync_type = type; | |
686 | } | |
4799ac81 | 687 | |
50180074 JK |
688 | /* Driver's seq tracking has to be disabled until resync succeeded */ |
689 | static inline bool tls_offload_tx_resync_pending(struct sock *sk) | |
690 | { | |
691 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
692 | bool ret; | |
693 | ||
694 | ret = test_bit(TLS_TX_SYNC_SCHED, &tls_ctx->flags); | |
695 | smp_mb__after_atomic(); | |
696 | return ret; | |
697 | } | |
698 | ||
d26b698d JK |
699 | int __net_init tls_proc_init(struct net *net); |
700 | void __net_exit tls_proc_fini(struct net *net); | |
701 | ||
3c4d7559 DW |
702 | int tls_proccess_cmsg(struct sock *sk, struct msghdr *msg, |
703 | unsigned char *record_type); | |
dafb67f3 BP |
704 | int decrypt_skb(struct sock *sk, struct sk_buff *skb, |
705 | struct scatterlist *sgout); | |
b9727d7f | 706 | struct sk_buff *tls_encrypt_skb(struct sk_buff *skb); |
3c4d7559 | 707 | |
e8f69799 | 708 | int tls_sw_fallback_init(struct sock *sk, |
d80a1b9d | 709 | struct tls_offload_context_tx *offload_ctx, |
e8f69799 IL |
710 | struct tls_crypto_info *crypto_info); |
711 | ||
be2fbc15 JK |
712 | #ifdef CONFIG_TLS_DEVICE |
713 | void tls_device_init(void); | |
714 | void tls_device_cleanup(void); | |
8d5a49e9 | 715 | void tls_device_sk_destruct(struct sock *sk); |
be2fbc15 JK |
716 | int tls_set_device_offload(struct sock *sk, struct tls_context *ctx); |
717 | void tls_device_free_resources_tx(struct sock *sk); | |
4799ac81 | 718 | int tls_set_device_offload_rx(struct sock *sk, struct tls_context *ctx); |
4799ac81 | 719 | void tls_device_offload_cleanup_rx(struct sock *sk); |
f953d33b | 720 | void tls_device_rx_resync_new_rec(struct sock *sk, u32 rcd_len, u32 seq); |
8538d29c | 721 | void tls_offload_tx_resync_request(struct sock *sk, u32 got_seq, u32 exp_seq); |
4de30a8d JK |
722 | int tls_device_decrypted(struct sock *sk, struct tls_context *tls_ctx, |
723 | struct sk_buff *skb, struct strp_msg *rxm); | |
8d5a49e9 JK |
724 | |
725 | static inline bool tls_is_sk_rx_device_offloaded(struct sock *sk) | |
726 | { | |
727 | if (!sk_fullsock(sk) || | |
728 | smp_load_acquire(&sk->sk_destruct) != tls_device_sk_destruct) | |
729 | return false; | |
730 | return tls_get_ctx(sk)->rx_conf == TLS_HW; | |
731 | } | |
be2fbc15 JK |
732 | #else |
733 | static inline void tls_device_init(void) {} | |
734 | static inline void tls_device_cleanup(void) {} | |
4799ac81 | 735 | |
be2fbc15 JK |
736 | static inline int |
737 | tls_set_device_offload(struct sock *sk, struct tls_context *ctx) | |
738 | { | |
739 | return -EOPNOTSUPP; | |
740 | } | |
741 | ||
742 | static inline void tls_device_free_resources_tx(struct sock *sk) {} | |
743 | ||
744 | static inline int | |
745 | tls_set_device_offload_rx(struct sock *sk, struct tls_context *ctx) | |
746 | { | |
747 | return -EOPNOTSUPP; | |
748 | } | |
749 | ||
750 | static inline void tls_device_offload_cleanup_rx(struct sock *sk) {} | |
751 | static inline void | |
752 | tls_device_rx_resync_new_rec(struct sock *sk, u32 rcd_len, u32 seq) {} | |
753 | ||
4de30a8d JK |
754 | static inline int |
755 | tls_device_decrypted(struct sock *sk, struct tls_context *tls_ctx, | |
756 | struct sk_buff *skb, struct strp_msg *rxm) | |
be2fbc15 JK |
757 | { |
758 | return 0; | |
759 | } | |
760 | #endif | |
3c4d7559 | 761 | #endif /* _TLS_OFFLOAD_H */ |