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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 | #include <linux/module.h> | |
35 | ||
36 | #include <net/tcp.h> | |
37 | #include <net/inet_common.h> | |
38 | #include <linux/highmem.h> | |
39 | #include <linux/netdevice.h> | |
40 | #include <linux/sched/signal.h> | |
dd0bed16 | 41 | #include <linux/inetdevice.h> |
3c4d7559 DW |
42 | |
43 | #include <net/tls.h> | |
44 | ||
45 | MODULE_AUTHOR("Mellanox Technologies"); | |
46 | MODULE_DESCRIPTION("Transport Layer Security Support"); | |
47 | MODULE_LICENSE("Dual BSD/GPL"); | |
037b0b86 | 48 | MODULE_ALIAS_TCP_ULP("tls"); |
3c4d7559 | 49 | |
c113187d BP |
50 | enum { |
51 | TLSV4, | |
52 | TLSV6, | |
53 | TLS_NUM_PROTS, | |
54 | }; | |
6d88207f | 55 | |
c113187d BP |
56 | static struct proto *saved_tcpv6_prot; |
57 | static DEFINE_MUTEX(tcpv6_prot_mutex); | |
28cb6f1e JF |
58 | static struct proto *saved_tcpv4_prot; |
59 | static DEFINE_MUTEX(tcpv4_prot_mutex); | |
dd0bed16 AG |
60 | static LIST_HEAD(device_list); |
61 | static DEFINE_MUTEX(device_mutex); | |
f66de3ee | 62 | static struct proto tls_prots[TLS_NUM_PROTS][TLS_NUM_CONFIG][TLS_NUM_CONFIG]; |
c46234eb | 63 | static struct proto_ops tls_sw_proto_ops; |
6d88207f | 64 | |
f66de3ee | 65 | static void update_sk_prot(struct sock *sk, struct tls_context *ctx) |
6d88207f | 66 | { |
c113187d BP |
67 | int ip_ver = sk->sk_family == AF_INET6 ? TLSV6 : TLSV4; |
68 | ||
f66de3ee | 69 | sk->sk_prot = &tls_prots[ip_ver][ctx->tx_conf][ctx->rx_conf]; |
6d88207f | 70 | } |
3c4d7559 DW |
71 | |
72 | int wait_on_pending_writer(struct sock *sk, long *timeo) | |
73 | { | |
74 | int rc = 0; | |
75 | DEFINE_WAIT_FUNC(wait, woken_wake_function); | |
76 | ||
77 | add_wait_queue(sk_sleep(sk), &wait); | |
78 | while (1) { | |
79 | if (!*timeo) { | |
80 | rc = -EAGAIN; | |
81 | break; | |
82 | } | |
83 | ||
84 | if (signal_pending(current)) { | |
85 | rc = sock_intr_errno(*timeo); | |
86 | break; | |
87 | } | |
88 | ||
89 | if (sk_wait_event(sk, timeo, !sk->sk_write_pending, &wait)) | |
90 | break; | |
91 | } | |
92 | remove_wait_queue(sk_sleep(sk), &wait); | |
93 | return rc; | |
94 | } | |
95 | ||
96 | int tls_push_sg(struct sock *sk, | |
97 | struct tls_context *ctx, | |
98 | struct scatterlist *sg, | |
99 | u16 first_offset, | |
100 | int flags) | |
101 | { | |
102 | int sendpage_flags = flags | MSG_SENDPAGE_NOTLAST; | |
103 | int ret = 0; | |
104 | struct page *p; | |
105 | size_t size; | |
106 | int offset = first_offset; | |
107 | ||
108 | size = sg->length - offset; | |
109 | offset += sg->offset; | |
110 | ||
c212d2c7 | 111 | ctx->in_tcp_sendpages = true; |
3c4d7559 DW |
112 | while (1) { |
113 | if (sg_is_last(sg)) | |
114 | sendpage_flags = flags; | |
115 | ||
116 | /* is sending application-limited? */ | |
117 | tcp_rate_check_app_limited(sk); | |
118 | p = sg_page(sg); | |
119 | retry: | |
120 | ret = do_tcp_sendpages(sk, p, offset, size, sendpage_flags); | |
121 | ||
122 | if (ret != size) { | |
123 | if (ret > 0) { | |
124 | offset += ret; | |
125 | size -= ret; | |
126 | goto retry; | |
127 | } | |
128 | ||
129 | offset -= sg->offset; | |
130 | ctx->partially_sent_offset = offset; | |
131 | ctx->partially_sent_record = (void *)sg; | |
080324c3 | 132 | ctx->in_tcp_sendpages = false; |
3c4d7559 DW |
133 | return ret; |
134 | } | |
135 | ||
136 | put_page(p); | |
137 | sk_mem_uncharge(sk, sg->length); | |
138 | sg = sg_next(sg); | |
139 | if (!sg) | |
140 | break; | |
141 | ||
142 | offset = sg->offset; | |
143 | size = sg->length; | |
144 | } | |
145 | ||
c212d2c7 DW |
146 | ctx->in_tcp_sendpages = false; |
147 | ctx->sk_write_space(sk); | |
3c4d7559 DW |
148 | |
149 | return 0; | |
150 | } | |
151 | ||
152 | static int tls_handle_open_record(struct sock *sk, int flags) | |
153 | { | |
154 | struct tls_context *ctx = tls_get_ctx(sk); | |
155 | ||
156 | if (tls_is_pending_open_record(ctx)) | |
157 | return ctx->push_pending_record(sk, flags); | |
158 | ||
159 | return 0; | |
160 | } | |
161 | ||
162 | int tls_proccess_cmsg(struct sock *sk, struct msghdr *msg, | |
163 | unsigned char *record_type) | |
164 | { | |
165 | struct cmsghdr *cmsg; | |
166 | int rc = -EINVAL; | |
167 | ||
168 | for_each_cmsghdr(cmsg, msg) { | |
169 | if (!CMSG_OK(msg, cmsg)) | |
170 | return -EINVAL; | |
171 | if (cmsg->cmsg_level != SOL_TLS) | |
172 | continue; | |
173 | ||
174 | switch (cmsg->cmsg_type) { | |
175 | case TLS_SET_RECORD_TYPE: | |
176 | if (cmsg->cmsg_len < CMSG_LEN(sizeof(*record_type))) | |
177 | return -EINVAL; | |
178 | ||
179 | if (msg->msg_flags & MSG_MORE) | |
180 | return -EINVAL; | |
181 | ||
182 | rc = tls_handle_open_record(sk, msg->msg_flags); | |
183 | if (rc) | |
184 | return rc; | |
185 | ||
186 | *record_type = *(unsigned char *)CMSG_DATA(cmsg); | |
187 | rc = 0; | |
188 | break; | |
189 | default: | |
190 | return -EINVAL; | |
191 | } | |
192 | } | |
193 | ||
194 | return rc; | |
195 | } | |
196 | ||
a42055e8 VG |
197 | int tls_push_partial_record(struct sock *sk, struct tls_context *ctx, |
198 | int flags) | |
3c4d7559 DW |
199 | { |
200 | struct scatterlist *sg; | |
201 | u16 offset; | |
202 | ||
3c4d7559 DW |
203 | sg = ctx->partially_sent_record; |
204 | offset = ctx->partially_sent_offset; | |
205 | ||
206 | ctx->partially_sent_record = NULL; | |
207 | return tls_push_sg(sk, ctx, sg, offset, flags); | |
208 | } | |
209 | ||
a42055e8 VG |
210 | int tls_push_pending_closed_record(struct sock *sk, |
211 | struct tls_context *tls_ctx, | |
212 | int flags, long *timeo) | |
213 | { | |
214 | struct tls_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx); | |
215 | ||
216 | if (tls_is_partially_sent_record(tls_ctx) || | |
9932a29a | 217 | !list_empty(&ctx->tx_list)) |
a42055e8 VG |
218 | return tls_tx_records(sk, flags); |
219 | else | |
220 | return tls_ctx->push_pending_record(sk, flags); | |
221 | } | |
222 | ||
3c4d7559 DW |
223 | static void tls_write_space(struct sock *sk) |
224 | { | |
225 | struct tls_context *ctx = tls_get_ctx(sk); | |
a42055e8 | 226 | struct tls_sw_context_tx *tx_ctx = tls_sw_ctx_tx(ctx); |
3c4d7559 | 227 | |
67db7cd2 JF |
228 | /* If in_tcp_sendpages call lower protocol write space handler |
229 | * to ensure we wake up any waiting operations there. For example | |
230 | * if do_tcp_sendpages where to call sk_wait_event. | |
231 | */ | |
232 | if (ctx->in_tcp_sendpages) { | |
233 | ctx->sk_write_space(sk); | |
c212d2c7 | 234 | return; |
67db7cd2 | 235 | } |
c212d2c7 | 236 | |
a42055e8 | 237 | /* Schedule the transmission if tx list is ready */ |
9932a29a | 238 | if (is_tx_ready(tx_ctx) && !sk->sk_write_pending) { |
a42055e8 VG |
239 | /* Schedule the transmission */ |
240 | if (!test_and_set_bit(BIT_TX_SCHEDULED, &tx_ctx->tx_bitmask)) | |
241 | schedule_delayed_work(&tx_ctx->tx_work.work, 0); | |
3c4d7559 DW |
242 | } |
243 | ||
244 | ctx->sk_write_space(sk); | |
245 | } | |
246 | ||
86029d10 SD |
247 | static void tls_ctx_free(struct tls_context *ctx) |
248 | { | |
249 | if (!ctx) | |
250 | return; | |
251 | ||
252 | memzero_explicit(&ctx->crypto_send, sizeof(ctx->crypto_send)); | |
253 | memzero_explicit(&ctx->crypto_recv, sizeof(ctx->crypto_recv)); | |
254 | kfree(ctx); | |
255 | } | |
256 | ||
3c4d7559 DW |
257 | static void tls_sk_proto_close(struct sock *sk, long timeout) |
258 | { | |
259 | struct tls_context *ctx = tls_get_ctx(sk); | |
260 | long timeo = sock_sndtimeo(sk, 0); | |
261 | void (*sk_proto_close)(struct sock *sk, long timeout); | |
98f0a395 | 262 | bool free_ctx = false; |
3c4d7559 DW |
263 | |
264 | lock_sock(sk); | |
ff45d820 IL |
265 | sk_proto_close = ctx->sk_proto_close; |
266 | ||
b2d6cee1 DM |
267 | if ((ctx->tx_conf == TLS_HW_RECORD && ctx->rx_conf == TLS_HW_RECORD) || |
268 | (ctx->tx_conf == TLS_BASE && ctx->rx_conf == TLS_BASE)) { | |
98f0a395 | 269 | free_ctx = true; |
ff45d820 IL |
270 | goto skip_tx_cleanup; |
271 | } | |
3c4d7559 DW |
272 | |
273 | if (!tls_complete_pending_work(sk, ctx, 0, &timeo)) | |
274 | tls_handle_open_record(sk, 0); | |
275 | ||
f66de3ee BP |
276 | /* We need these for tls_sw_fallback handling of other packets */ |
277 | if (ctx->tx_conf == TLS_SW) { | |
278 | kfree(ctx->tx.rec_seq); | |
279 | kfree(ctx->tx.iv); | |
280 | tls_sw_free_resources_tx(sk); | |
281 | } | |
3c4d7559 | 282 | |
f66de3ee BP |
283 | if (ctx->rx_conf == TLS_SW) { |
284 | kfree(ctx->rx.rec_seq); | |
285 | kfree(ctx->rx.iv); | |
286 | tls_sw_free_resources_rx(sk); | |
c46234eb | 287 | } |
3c4d7559 | 288 | |
e8f69799 | 289 | #ifdef CONFIG_TLS_DEVICE |
4799ac81 BP |
290 | if (ctx->rx_conf == TLS_HW) |
291 | tls_device_offload_cleanup_rx(sk); | |
292 | ||
293 | if (ctx->tx_conf != TLS_HW && ctx->rx_conf != TLS_HW) { | |
e8f69799 IL |
294 | #else |
295 | { | |
296 | #endif | |
86029d10 | 297 | tls_ctx_free(ctx); |
e8f69799 IL |
298 | ctx = NULL; |
299 | } | |
300 | ||
ff45d820 | 301 | skip_tx_cleanup: |
3c4d7559 DW |
302 | release_sock(sk); |
303 | sk_proto_close(sk, timeout); | |
dd0bed16 AG |
304 | /* free ctx for TLS_HW_RECORD, used by tcp_set_state |
305 | * for sk->sk_prot->unhash [tls_hw_unhash] | |
306 | */ | |
98f0a395 | 307 | if (free_ctx) |
86029d10 | 308 | tls_ctx_free(ctx); |
3c4d7559 DW |
309 | } |
310 | ||
311 | static int do_tls_getsockopt_tx(struct sock *sk, char __user *optval, | |
312 | int __user *optlen) | |
313 | { | |
314 | int rc = 0; | |
315 | struct tls_context *ctx = tls_get_ctx(sk); | |
316 | struct tls_crypto_info *crypto_info; | |
317 | int len; | |
318 | ||
319 | if (get_user(len, optlen)) | |
320 | return -EFAULT; | |
321 | ||
322 | if (!optval || (len < sizeof(*crypto_info))) { | |
323 | rc = -EINVAL; | |
324 | goto out; | |
325 | } | |
326 | ||
327 | if (!ctx) { | |
328 | rc = -EBUSY; | |
329 | goto out; | |
330 | } | |
331 | ||
332 | /* get user crypto info */ | |
86029d10 | 333 | crypto_info = &ctx->crypto_send.info; |
3c4d7559 DW |
334 | |
335 | if (!TLS_CRYPTO_INFO_READY(crypto_info)) { | |
336 | rc = -EBUSY; | |
337 | goto out; | |
338 | } | |
339 | ||
5a3b886c | 340 | if (len == sizeof(*crypto_info)) { |
ac55cd61 DC |
341 | if (copy_to_user(optval, crypto_info, sizeof(*crypto_info))) |
342 | rc = -EFAULT; | |
3c4d7559 DW |
343 | goto out; |
344 | } | |
345 | ||
346 | switch (crypto_info->cipher_type) { | |
347 | case TLS_CIPHER_AES_GCM_128: { | |
348 | struct tls12_crypto_info_aes_gcm_128 * | |
349 | crypto_info_aes_gcm_128 = | |
350 | container_of(crypto_info, | |
351 | struct tls12_crypto_info_aes_gcm_128, | |
352 | info); | |
353 | ||
354 | if (len != sizeof(*crypto_info_aes_gcm_128)) { | |
355 | rc = -EINVAL; | |
356 | goto out; | |
357 | } | |
358 | lock_sock(sk); | |
a1dfa681 | 359 | memcpy(crypto_info_aes_gcm_128->iv, |
dbe42559 | 360 | ctx->tx.iv + TLS_CIPHER_AES_GCM_128_SALT_SIZE, |
3c4d7559 | 361 | TLS_CIPHER_AES_GCM_128_IV_SIZE); |
dbe42559 | 362 | memcpy(crypto_info_aes_gcm_128->rec_seq, ctx->tx.rec_seq, |
c410c196 | 363 | TLS_CIPHER_AES_GCM_128_REC_SEQ_SIZE); |
3c4d7559 | 364 | release_sock(sk); |
ac55cd61 DC |
365 | if (copy_to_user(optval, |
366 | crypto_info_aes_gcm_128, | |
367 | sizeof(*crypto_info_aes_gcm_128))) | |
368 | rc = -EFAULT; | |
3c4d7559 DW |
369 | break; |
370 | } | |
371 | default: | |
372 | rc = -EINVAL; | |
373 | } | |
374 | ||
375 | out: | |
376 | return rc; | |
377 | } | |
378 | ||
379 | static int do_tls_getsockopt(struct sock *sk, int optname, | |
380 | char __user *optval, int __user *optlen) | |
381 | { | |
382 | int rc = 0; | |
383 | ||
384 | switch (optname) { | |
385 | case TLS_TX: | |
386 | rc = do_tls_getsockopt_tx(sk, optval, optlen); | |
387 | break; | |
388 | default: | |
389 | rc = -ENOPROTOOPT; | |
390 | break; | |
391 | } | |
392 | return rc; | |
393 | } | |
394 | ||
395 | static int tls_getsockopt(struct sock *sk, int level, int optname, | |
396 | char __user *optval, int __user *optlen) | |
397 | { | |
398 | struct tls_context *ctx = tls_get_ctx(sk); | |
399 | ||
400 | if (level != SOL_TLS) | |
401 | return ctx->getsockopt(sk, level, optname, optval, optlen); | |
402 | ||
403 | return do_tls_getsockopt(sk, optname, optval, optlen); | |
404 | } | |
405 | ||
c46234eb DW |
406 | static int do_tls_setsockopt_conf(struct sock *sk, char __user *optval, |
407 | unsigned int optlen, int tx) | |
3c4d7559 | 408 | { |
196c31b4 | 409 | struct tls_crypto_info *crypto_info; |
3c4d7559 | 410 | struct tls_context *ctx = tls_get_ctx(sk); |
3c4d7559 | 411 | int rc = 0; |
58371585 | 412 | int conf; |
3c4d7559 DW |
413 | |
414 | if (!optval || (optlen < sizeof(*crypto_info))) { | |
415 | rc = -EINVAL; | |
416 | goto out; | |
417 | } | |
418 | ||
c46234eb | 419 | if (tx) |
86029d10 | 420 | crypto_info = &ctx->crypto_send.info; |
c46234eb | 421 | else |
86029d10 | 422 | crypto_info = &ctx->crypto_recv.info; |
c46234eb | 423 | |
196c31b4 | 424 | /* Currently we don't support set crypto info more than one time */ |
877d17c7 SD |
425 | if (TLS_CRYPTO_INFO_READY(crypto_info)) { |
426 | rc = -EBUSY; | |
196c31b4 | 427 | goto out; |
877d17c7 | 428 | } |
196c31b4 IL |
429 | |
430 | rc = copy_from_user(crypto_info, optval, sizeof(*crypto_info)); | |
3c4d7559 DW |
431 | if (rc) { |
432 | rc = -EFAULT; | |
257082e6 | 433 | goto err_crypto_info; |
3c4d7559 DW |
434 | } |
435 | ||
436 | /* check version */ | |
196c31b4 | 437 | if (crypto_info->version != TLS_1_2_VERSION) { |
3c4d7559 | 438 | rc = -ENOTSUPP; |
196c31b4 | 439 | goto err_crypto_info; |
3c4d7559 DW |
440 | } |
441 | ||
196c31b4 | 442 | switch (crypto_info->cipher_type) { |
3c4d7559 DW |
443 | case TLS_CIPHER_AES_GCM_128: { |
444 | if (optlen != sizeof(struct tls12_crypto_info_aes_gcm_128)) { | |
445 | rc = -EINVAL; | |
6db959c8 | 446 | goto err_crypto_info; |
3c4d7559 | 447 | } |
196c31b4 IL |
448 | rc = copy_from_user(crypto_info + 1, optval + sizeof(*crypto_info), |
449 | optlen - sizeof(*crypto_info)); | |
3c4d7559 DW |
450 | if (rc) { |
451 | rc = -EFAULT; | |
452 | goto err_crypto_info; | |
453 | } | |
454 | break; | |
455 | } | |
456 | default: | |
457 | rc = -EINVAL; | |
6db959c8 | 458 | goto err_crypto_info; |
3c4d7559 DW |
459 | } |
460 | ||
c46234eb | 461 | if (tx) { |
e8f69799 IL |
462 | #ifdef CONFIG_TLS_DEVICE |
463 | rc = tls_set_device_offload(sk, ctx); | |
464 | conf = TLS_HW; | |
465 | if (rc) { | |
466 | #else | |
467 | { | |
468 | #endif | |
469 | rc = tls_set_sw_offload(sk, ctx, 1); | |
470 | conf = TLS_SW; | |
471 | } | |
c46234eb | 472 | } else { |
4799ac81 BP |
473 | #ifdef CONFIG_TLS_DEVICE |
474 | rc = tls_set_device_offload_rx(sk, ctx); | |
475 | conf = TLS_HW; | |
476 | if (rc) { | |
477 | #else | |
478 | { | |
479 | #endif | |
480 | rc = tls_set_sw_offload(sk, ctx, 0); | |
481 | conf = TLS_SW; | |
482 | } | |
c46234eb DW |
483 | } |
484 | ||
3c4d7559 DW |
485 | if (rc) |
486 | goto err_crypto_info; | |
487 | ||
f66de3ee BP |
488 | if (tx) |
489 | ctx->tx_conf = conf; | |
490 | else | |
491 | ctx->rx_conf = conf; | |
6d88207f | 492 | update_sk_prot(sk, ctx); |
c46234eb DW |
493 | if (tx) { |
494 | ctx->sk_write_space = sk->sk_write_space; | |
495 | sk->sk_write_space = tls_write_space; | |
496 | } else { | |
497 | sk->sk_socket->ops = &tls_sw_proto_ops; | |
498 | } | |
3c4d7559 DW |
499 | goto out; |
500 | ||
501 | err_crypto_info: | |
c844eb46 | 502 | memzero_explicit(crypto_info, sizeof(union tls_crypto_context)); |
3c4d7559 DW |
503 | out: |
504 | return rc; | |
505 | } | |
506 | ||
507 | static int do_tls_setsockopt(struct sock *sk, int optname, | |
508 | char __user *optval, unsigned int optlen) | |
509 | { | |
510 | int rc = 0; | |
511 | ||
512 | switch (optname) { | |
513 | case TLS_TX: | |
c46234eb | 514 | case TLS_RX: |
3c4d7559 | 515 | lock_sock(sk); |
c46234eb DW |
516 | rc = do_tls_setsockopt_conf(sk, optval, optlen, |
517 | optname == TLS_TX); | |
3c4d7559 DW |
518 | release_sock(sk); |
519 | break; | |
520 | default: | |
521 | rc = -ENOPROTOOPT; | |
522 | break; | |
523 | } | |
524 | return rc; | |
525 | } | |
526 | ||
527 | static int tls_setsockopt(struct sock *sk, int level, int optname, | |
528 | char __user *optval, unsigned int optlen) | |
529 | { | |
530 | struct tls_context *ctx = tls_get_ctx(sk); | |
531 | ||
532 | if (level != SOL_TLS) | |
533 | return ctx->setsockopt(sk, level, optname, optval, optlen); | |
534 | ||
535 | return do_tls_setsockopt(sk, optname, optval, optlen); | |
536 | } | |
537 | ||
dd0bed16 AG |
538 | static struct tls_context *create_ctx(struct sock *sk) |
539 | { | |
540 | struct inet_connection_sock *icsk = inet_csk(sk); | |
541 | struct tls_context *ctx; | |
542 | ||
543 | ctx = kzalloc(sizeof(*ctx), GFP_KERNEL); | |
544 | if (!ctx) | |
545 | return NULL; | |
546 | ||
547 | icsk->icsk_ulp_data = ctx; | |
548 | return ctx; | |
549 | } | |
550 | ||
551 | static int tls_hw_prot(struct sock *sk) | |
552 | { | |
553 | struct tls_context *ctx; | |
554 | struct tls_device *dev; | |
555 | int rc = 0; | |
556 | ||
557 | mutex_lock(&device_mutex); | |
558 | list_for_each_entry(dev, &device_list, dev_list) { | |
559 | if (dev->feature && dev->feature(dev)) { | |
560 | ctx = create_ctx(sk); | |
561 | if (!ctx) | |
562 | goto out; | |
563 | ||
564 | ctx->hash = sk->sk_prot->hash; | |
565 | ctx->unhash = sk->sk_prot->unhash; | |
566 | ctx->sk_proto_close = sk->sk_prot->close; | |
f66de3ee BP |
567 | ctx->rx_conf = TLS_HW_RECORD; |
568 | ctx->tx_conf = TLS_HW_RECORD; | |
dd0bed16 AG |
569 | update_sk_prot(sk, ctx); |
570 | rc = 1; | |
571 | break; | |
572 | } | |
573 | } | |
574 | out: | |
575 | mutex_unlock(&device_mutex); | |
576 | return rc; | |
577 | } | |
578 | ||
579 | static void tls_hw_unhash(struct sock *sk) | |
580 | { | |
581 | struct tls_context *ctx = tls_get_ctx(sk); | |
582 | struct tls_device *dev; | |
583 | ||
584 | mutex_lock(&device_mutex); | |
585 | list_for_each_entry(dev, &device_list, dev_list) { | |
586 | if (dev->unhash) | |
587 | dev->unhash(dev, sk); | |
588 | } | |
589 | mutex_unlock(&device_mutex); | |
590 | ctx->unhash(sk); | |
591 | } | |
592 | ||
593 | static int tls_hw_hash(struct sock *sk) | |
594 | { | |
595 | struct tls_context *ctx = tls_get_ctx(sk); | |
596 | struct tls_device *dev; | |
597 | int err; | |
598 | ||
599 | err = ctx->hash(sk); | |
600 | mutex_lock(&device_mutex); | |
601 | list_for_each_entry(dev, &device_list, dev_list) { | |
602 | if (dev->hash) | |
603 | err |= dev->hash(dev, sk); | |
604 | } | |
605 | mutex_unlock(&device_mutex); | |
606 | ||
607 | if (err) | |
608 | tls_hw_unhash(sk); | |
609 | return err; | |
610 | } | |
611 | ||
f66de3ee BP |
612 | static void build_protos(struct proto prot[TLS_NUM_CONFIG][TLS_NUM_CONFIG], |
613 | struct proto *base) | |
c113187d | 614 | { |
f66de3ee BP |
615 | prot[TLS_BASE][TLS_BASE] = *base; |
616 | prot[TLS_BASE][TLS_BASE].setsockopt = tls_setsockopt; | |
617 | prot[TLS_BASE][TLS_BASE].getsockopt = tls_getsockopt; | |
618 | prot[TLS_BASE][TLS_BASE].close = tls_sk_proto_close; | |
619 | ||
620 | prot[TLS_SW][TLS_BASE] = prot[TLS_BASE][TLS_BASE]; | |
621 | prot[TLS_SW][TLS_BASE].sendmsg = tls_sw_sendmsg; | |
622 | prot[TLS_SW][TLS_BASE].sendpage = tls_sw_sendpage; | |
623 | ||
624 | prot[TLS_BASE][TLS_SW] = prot[TLS_BASE][TLS_BASE]; | |
924ad65e JF |
625 | prot[TLS_BASE][TLS_SW].recvmsg = tls_sw_recvmsg; |
626 | prot[TLS_BASE][TLS_SW].stream_memory_read = tls_sw_stream_read; | |
627 | prot[TLS_BASE][TLS_SW].close = tls_sk_proto_close; | |
f66de3ee BP |
628 | |
629 | prot[TLS_SW][TLS_SW] = prot[TLS_SW][TLS_BASE]; | |
924ad65e JF |
630 | prot[TLS_SW][TLS_SW].recvmsg = tls_sw_recvmsg; |
631 | prot[TLS_SW][TLS_SW].stream_memory_read = tls_sw_stream_read; | |
632 | prot[TLS_SW][TLS_SW].close = tls_sk_proto_close; | |
f66de3ee | 633 | |
e8f69799 IL |
634 | #ifdef CONFIG_TLS_DEVICE |
635 | prot[TLS_HW][TLS_BASE] = prot[TLS_BASE][TLS_BASE]; | |
636 | prot[TLS_HW][TLS_BASE].sendmsg = tls_device_sendmsg; | |
637 | prot[TLS_HW][TLS_BASE].sendpage = tls_device_sendpage; | |
638 | ||
639 | prot[TLS_HW][TLS_SW] = prot[TLS_BASE][TLS_SW]; | |
640 | prot[TLS_HW][TLS_SW].sendmsg = tls_device_sendmsg; | |
641 | prot[TLS_HW][TLS_SW].sendpage = tls_device_sendpage; | |
4799ac81 BP |
642 | |
643 | prot[TLS_BASE][TLS_HW] = prot[TLS_BASE][TLS_SW]; | |
644 | ||
645 | prot[TLS_SW][TLS_HW] = prot[TLS_SW][TLS_SW]; | |
646 | ||
647 | prot[TLS_HW][TLS_HW] = prot[TLS_HW][TLS_SW]; | |
e8f69799 IL |
648 | #endif |
649 | ||
f66de3ee BP |
650 | prot[TLS_HW_RECORD][TLS_HW_RECORD] = *base; |
651 | prot[TLS_HW_RECORD][TLS_HW_RECORD].hash = tls_hw_hash; | |
652 | prot[TLS_HW_RECORD][TLS_HW_RECORD].unhash = tls_hw_unhash; | |
653 | prot[TLS_HW_RECORD][TLS_HW_RECORD].close = tls_sk_proto_close; | |
c113187d BP |
654 | } |
655 | ||
3c4d7559 DW |
656 | static int tls_init(struct sock *sk) |
657 | { | |
c113187d | 658 | int ip_ver = sk->sk_family == AF_INET6 ? TLSV6 : TLSV4; |
3c4d7559 DW |
659 | struct tls_context *ctx; |
660 | int rc = 0; | |
661 | ||
dd0bed16 AG |
662 | if (tls_hw_prot(sk)) |
663 | goto out; | |
664 | ||
d91c3e17 IL |
665 | /* The TLS ulp is currently supported only for TCP sockets |
666 | * in ESTABLISHED state. | |
667 | * Supporting sockets in LISTEN state will require us | |
668 | * to modify the accept implementation to clone rather then | |
669 | * share the ulp context. | |
670 | */ | |
671 | if (sk->sk_state != TCP_ESTABLISHED) | |
672 | return -ENOTSUPP; | |
673 | ||
3c4d7559 | 674 | /* allocate tls context */ |
dd0bed16 | 675 | ctx = create_ctx(sk); |
3c4d7559 DW |
676 | if (!ctx) { |
677 | rc = -ENOMEM; | |
678 | goto out; | |
679 | } | |
3c4d7559 DW |
680 | ctx->setsockopt = sk->sk_prot->setsockopt; |
681 | ctx->getsockopt = sk->sk_prot->getsockopt; | |
ff45d820 | 682 | ctx->sk_proto_close = sk->sk_prot->close; |
6d88207f | 683 | |
e8f69799 | 684 | /* Build IPv6 TLS whenever the address of tcpv6 _prot changes */ |
c113187d BP |
685 | if (ip_ver == TLSV6 && |
686 | unlikely(sk->sk_prot != smp_load_acquire(&saved_tcpv6_prot))) { | |
687 | mutex_lock(&tcpv6_prot_mutex); | |
688 | if (likely(sk->sk_prot != saved_tcpv6_prot)) { | |
689 | build_protos(tls_prots[TLSV6], sk->sk_prot); | |
690 | smp_store_release(&saved_tcpv6_prot, sk->sk_prot); | |
691 | } | |
692 | mutex_unlock(&tcpv6_prot_mutex); | |
693 | } | |
694 | ||
28cb6f1e JF |
695 | if (ip_ver == TLSV4 && |
696 | unlikely(sk->sk_prot != smp_load_acquire(&saved_tcpv4_prot))) { | |
697 | mutex_lock(&tcpv4_prot_mutex); | |
698 | if (likely(sk->sk_prot != saved_tcpv4_prot)) { | |
699 | build_protos(tls_prots[TLSV4], sk->sk_prot); | |
700 | smp_store_release(&saved_tcpv4_prot, sk->sk_prot); | |
701 | } | |
702 | mutex_unlock(&tcpv4_prot_mutex); | |
703 | } | |
704 | ||
f66de3ee BP |
705 | ctx->tx_conf = TLS_BASE; |
706 | ctx->rx_conf = TLS_BASE; | |
6d88207f | 707 | update_sk_prot(sk, ctx); |
3c4d7559 DW |
708 | out: |
709 | return rc; | |
710 | } | |
711 | ||
dd0bed16 AG |
712 | void tls_register_device(struct tls_device *device) |
713 | { | |
714 | mutex_lock(&device_mutex); | |
715 | list_add_tail(&device->dev_list, &device_list); | |
716 | mutex_unlock(&device_mutex); | |
717 | } | |
718 | EXPORT_SYMBOL(tls_register_device); | |
719 | ||
720 | void tls_unregister_device(struct tls_device *device) | |
721 | { | |
722 | mutex_lock(&device_mutex); | |
723 | list_del(&device->dev_list); | |
724 | mutex_unlock(&device_mutex); | |
725 | } | |
726 | EXPORT_SYMBOL(tls_unregister_device); | |
727 | ||
3c4d7559 DW |
728 | static struct tcp_ulp_ops tcp_tls_ulp_ops __read_mostly = { |
729 | .name = "tls", | |
730 | .owner = THIS_MODULE, | |
731 | .init = tls_init, | |
732 | }; | |
733 | ||
734 | static int __init tls_register(void) | |
735 | { | |
c46234eb | 736 | tls_sw_proto_ops = inet_stream_ops; |
c46234eb DW |
737 | tls_sw_proto_ops.splice_read = tls_sw_splice_read; |
738 | ||
e8f69799 IL |
739 | #ifdef CONFIG_TLS_DEVICE |
740 | tls_device_init(); | |
741 | #endif | |
3c4d7559 DW |
742 | tcp_register_ulp(&tcp_tls_ulp_ops); |
743 | ||
744 | return 0; | |
745 | } | |
746 | ||
747 | static void __exit tls_unregister(void) | |
748 | { | |
749 | tcp_unregister_ulp(&tcp_tls_ulp_ops); | |
e8f69799 IL |
750 | #ifdef CONFIG_TLS_DEVICE |
751 | tls_device_cleanup(); | |
752 | #endif | |
3c4d7559 DW |
753 | } |
754 | ||
755 | module_init(tls_register); | |
756 | module_exit(tls_unregister); |