Commit | Line | Data |
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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 | 60 | static LIST_HEAD(device_list); |
df9d4a17 | 61 | static DEFINE_SPINLOCK(device_spinlock); |
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; |
63a6b3fe AG |
64 | static void build_protos(struct proto prot[TLS_NUM_CONFIG][TLS_NUM_CONFIG], |
65 | struct proto *base); | |
6d88207f | 66 | |
f66de3ee | 67 | static void update_sk_prot(struct sock *sk, struct tls_context *ctx) |
6d88207f | 68 | { |
c113187d BP |
69 | int ip_ver = sk->sk_family == AF_INET6 ? TLSV6 : TLSV4; |
70 | ||
f66de3ee | 71 | sk->sk_prot = &tls_prots[ip_ver][ctx->tx_conf][ctx->rx_conf]; |
6d88207f | 72 | } |
3c4d7559 DW |
73 | |
74 | int wait_on_pending_writer(struct sock *sk, long *timeo) | |
75 | { | |
76 | int rc = 0; | |
77 | DEFINE_WAIT_FUNC(wait, woken_wake_function); | |
78 | ||
79 | add_wait_queue(sk_sleep(sk), &wait); | |
80 | while (1) { | |
81 | if (!*timeo) { | |
82 | rc = -EAGAIN; | |
83 | break; | |
84 | } | |
85 | ||
86 | if (signal_pending(current)) { | |
87 | rc = sock_intr_errno(*timeo); | |
88 | break; | |
89 | } | |
90 | ||
91 | if (sk_wait_event(sk, timeo, !sk->sk_write_pending, &wait)) | |
92 | break; | |
93 | } | |
94 | remove_wait_queue(sk_sleep(sk), &wait); | |
95 | return rc; | |
96 | } | |
97 | ||
98 | int tls_push_sg(struct sock *sk, | |
99 | struct tls_context *ctx, | |
100 | struct scatterlist *sg, | |
101 | u16 first_offset, | |
102 | int flags) | |
103 | { | |
104 | int sendpage_flags = flags | MSG_SENDPAGE_NOTLAST; | |
105 | int ret = 0; | |
106 | struct page *p; | |
107 | size_t size; | |
108 | int offset = first_offset; | |
109 | ||
110 | size = sg->length - offset; | |
111 | offset += sg->offset; | |
112 | ||
c212d2c7 | 113 | ctx->in_tcp_sendpages = true; |
3c4d7559 DW |
114 | while (1) { |
115 | if (sg_is_last(sg)) | |
116 | sendpage_flags = flags; | |
117 | ||
118 | /* is sending application-limited? */ | |
119 | tcp_rate_check_app_limited(sk); | |
120 | p = sg_page(sg); | |
121 | retry: | |
122 | ret = do_tcp_sendpages(sk, p, offset, size, sendpage_flags); | |
123 | ||
124 | if (ret != size) { | |
125 | if (ret > 0) { | |
126 | offset += ret; | |
127 | size -= ret; | |
128 | goto retry; | |
129 | } | |
130 | ||
131 | offset -= sg->offset; | |
132 | ctx->partially_sent_offset = offset; | |
133 | ctx->partially_sent_record = (void *)sg; | |
080324c3 | 134 | ctx->in_tcp_sendpages = false; |
3c4d7559 DW |
135 | return ret; |
136 | } | |
137 | ||
138 | put_page(p); | |
139 | sk_mem_uncharge(sk, sg->length); | |
140 | sg = sg_next(sg); | |
141 | if (!sg) | |
142 | break; | |
143 | ||
144 | offset = sg->offset; | |
145 | size = sg->length; | |
146 | } | |
147 | ||
c212d2c7 DW |
148 | ctx->in_tcp_sendpages = false; |
149 | ctx->sk_write_space(sk); | |
3c4d7559 DW |
150 | |
151 | return 0; | |
152 | } | |
153 | ||
154 | static int tls_handle_open_record(struct sock *sk, int flags) | |
155 | { | |
156 | struct tls_context *ctx = tls_get_ctx(sk); | |
157 | ||
158 | if (tls_is_pending_open_record(ctx)) | |
159 | return ctx->push_pending_record(sk, flags); | |
160 | ||
161 | return 0; | |
162 | } | |
163 | ||
164 | int tls_proccess_cmsg(struct sock *sk, struct msghdr *msg, | |
165 | unsigned char *record_type) | |
166 | { | |
167 | struct cmsghdr *cmsg; | |
168 | int rc = -EINVAL; | |
169 | ||
170 | for_each_cmsghdr(cmsg, msg) { | |
171 | if (!CMSG_OK(msg, cmsg)) | |
172 | return -EINVAL; | |
173 | if (cmsg->cmsg_level != SOL_TLS) | |
174 | continue; | |
175 | ||
176 | switch (cmsg->cmsg_type) { | |
177 | case TLS_SET_RECORD_TYPE: | |
178 | if (cmsg->cmsg_len < CMSG_LEN(sizeof(*record_type))) | |
179 | return -EINVAL; | |
180 | ||
181 | if (msg->msg_flags & MSG_MORE) | |
182 | return -EINVAL; | |
183 | ||
184 | rc = tls_handle_open_record(sk, msg->msg_flags); | |
185 | if (rc) | |
186 | return rc; | |
187 | ||
188 | *record_type = *(unsigned char *)CMSG_DATA(cmsg); | |
189 | rc = 0; | |
190 | break; | |
191 | default: | |
192 | return -EINVAL; | |
193 | } | |
194 | } | |
195 | ||
196 | return rc; | |
197 | } | |
198 | ||
a42055e8 VG |
199 | int tls_push_partial_record(struct sock *sk, struct tls_context *ctx, |
200 | int flags) | |
3c4d7559 DW |
201 | { |
202 | struct scatterlist *sg; | |
203 | u16 offset; | |
204 | ||
3c4d7559 DW |
205 | sg = ctx->partially_sent_record; |
206 | offset = ctx->partially_sent_offset; | |
207 | ||
208 | ctx->partially_sent_record = NULL; | |
209 | return tls_push_sg(sk, ctx, sg, offset, flags); | |
210 | } | |
211 | ||
212 | static void tls_write_space(struct sock *sk) | |
213 | { | |
214 | struct tls_context *ctx = tls_get_ctx(sk); | |
a42055e8 | 215 | struct tls_sw_context_tx *tx_ctx = tls_sw_ctx_tx(ctx); |
3c4d7559 | 216 | |
67db7cd2 JF |
217 | /* If in_tcp_sendpages call lower protocol write space handler |
218 | * to ensure we wake up any waiting operations there. For example | |
219 | * if do_tcp_sendpages where to call sk_wait_event. | |
220 | */ | |
221 | if (ctx->in_tcp_sendpages) { | |
222 | ctx->sk_write_space(sk); | |
c212d2c7 | 223 | return; |
67db7cd2 | 224 | } |
c212d2c7 | 225 | |
a42055e8 | 226 | /* Schedule the transmission if tx list is ready */ |
9932a29a | 227 | if (is_tx_ready(tx_ctx) && !sk->sk_write_pending) { |
a42055e8 VG |
228 | /* Schedule the transmission */ |
229 | if (!test_and_set_bit(BIT_TX_SCHEDULED, &tx_ctx->tx_bitmask)) | |
230 | schedule_delayed_work(&tx_ctx->tx_work.work, 0); | |
3c4d7559 DW |
231 | } |
232 | ||
233 | ctx->sk_write_space(sk); | |
234 | } | |
235 | ||
86029d10 SD |
236 | static void tls_ctx_free(struct tls_context *ctx) |
237 | { | |
238 | if (!ctx) | |
239 | return; | |
240 | ||
241 | memzero_explicit(&ctx->crypto_send, sizeof(ctx->crypto_send)); | |
242 | memzero_explicit(&ctx->crypto_recv, sizeof(ctx->crypto_recv)); | |
243 | kfree(ctx); | |
244 | } | |
245 | ||
3c4d7559 DW |
246 | static void tls_sk_proto_close(struct sock *sk, long timeout) |
247 | { | |
248 | struct tls_context *ctx = tls_get_ctx(sk); | |
249 | long timeo = sock_sndtimeo(sk, 0); | |
250 | void (*sk_proto_close)(struct sock *sk, long timeout); | |
98f0a395 | 251 | bool free_ctx = false; |
3c4d7559 DW |
252 | |
253 | lock_sock(sk); | |
ff45d820 IL |
254 | sk_proto_close = ctx->sk_proto_close; |
255 | ||
76f7164d AG |
256 | if (ctx->tx_conf == TLS_HW_RECORD && ctx->rx_conf == TLS_HW_RECORD) |
257 | goto skip_tx_cleanup; | |
258 | ||
259 | if (ctx->tx_conf == TLS_BASE && ctx->rx_conf == TLS_BASE) { | |
98f0a395 | 260 | free_ctx = true; |
ff45d820 IL |
261 | goto skip_tx_cleanup; |
262 | } | |
3c4d7559 DW |
263 | |
264 | if (!tls_complete_pending_work(sk, ctx, 0, &timeo)) | |
265 | tls_handle_open_record(sk, 0); | |
266 | ||
f66de3ee BP |
267 | /* We need these for tls_sw_fallback handling of other packets */ |
268 | if (ctx->tx_conf == TLS_SW) { | |
269 | kfree(ctx->tx.rec_seq); | |
270 | kfree(ctx->tx.iv); | |
271 | tls_sw_free_resources_tx(sk); | |
272 | } | |
3c4d7559 | 273 | |
f66de3ee BP |
274 | if (ctx->rx_conf == TLS_SW) { |
275 | kfree(ctx->rx.rec_seq); | |
276 | kfree(ctx->rx.iv); | |
277 | tls_sw_free_resources_rx(sk); | |
c46234eb | 278 | } |
3c4d7559 | 279 | |
e8f69799 | 280 | #ifdef CONFIG_TLS_DEVICE |
4799ac81 BP |
281 | if (ctx->rx_conf == TLS_HW) |
282 | tls_device_offload_cleanup_rx(sk); | |
283 | ||
284 | if (ctx->tx_conf != TLS_HW && ctx->rx_conf != TLS_HW) { | |
e8f69799 IL |
285 | #else |
286 | { | |
287 | #endif | |
86029d10 | 288 | tls_ctx_free(ctx); |
e8f69799 IL |
289 | ctx = NULL; |
290 | } | |
291 | ||
ff45d820 | 292 | skip_tx_cleanup: |
3c4d7559 DW |
293 | release_sock(sk); |
294 | sk_proto_close(sk, timeout); | |
dd0bed16 AG |
295 | /* free ctx for TLS_HW_RECORD, used by tcp_set_state |
296 | * for sk->sk_prot->unhash [tls_hw_unhash] | |
297 | */ | |
98f0a395 | 298 | if (free_ctx) |
86029d10 | 299 | tls_ctx_free(ctx); |
3c4d7559 DW |
300 | } |
301 | ||
302 | static int do_tls_getsockopt_tx(struct sock *sk, char __user *optval, | |
303 | int __user *optlen) | |
304 | { | |
305 | int rc = 0; | |
306 | struct tls_context *ctx = tls_get_ctx(sk); | |
307 | struct tls_crypto_info *crypto_info; | |
308 | int len; | |
309 | ||
310 | if (get_user(len, optlen)) | |
311 | return -EFAULT; | |
312 | ||
313 | if (!optval || (len < sizeof(*crypto_info))) { | |
314 | rc = -EINVAL; | |
315 | goto out; | |
316 | } | |
317 | ||
318 | if (!ctx) { | |
319 | rc = -EBUSY; | |
320 | goto out; | |
321 | } | |
322 | ||
323 | /* get user crypto info */ | |
86029d10 | 324 | crypto_info = &ctx->crypto_send.info; |
3c4d7559 DW |
325 | |
326 | if (!TLS_CRYPTO_INFO_READY(crypto_info)) { | |
327 | rc = -EBUSY; | |
328 | goto out; | |
329 | } | |
330 | ||
5a3b886c | 331 | if (len == sizeof(*crypto_info)) { |
ac55cd61 DC |
332 | if (copy_to_user(optval, crypto_info, sizeof(*crypto_info))) |
333 | rc = -EFAULT; | |
3c4d7559 DW |
334 | goto out; |
335 | } | |
336 | ||
337 | switch (crypto_info->cipher_type) { | |
338 | case TLS_CIPHER_AES_GCM_128: { | |
339 | struct tls12_crypto_info_aes_gcm_128 * | |
340 | crypto_info_aes_gcm_128 = | |
341 | container_of(crypto_info, | |
342 | struct tls12_crypto_info_aes_gcm_128, | |
343 | info); | |
344 | ||
345 | if (len != sizeof(*crypto_info_aes_gcm_128)) { | |
346 | rc = -EINVAL; | |
347 | goto out; | |
348 | } | |
349 | lock_sock(sk); | |
a1dfa681 | 350 | memcpy(crypto_info_aes_gcm_128->iv, |
dbe42559 | 351 | ctx->tx.iv + TLS_CIPHER_AES_GCM_128_SALT_SIZE, |
3c4d7559 | 352 | TLS_CIPHER_AES_GCM_128_IV_SIZE); |
dbe42559 | 353 | memcpy(crypto_info_aes_gcm_128->rec_seq, ctx->tx.rec_seq, |
c410c196 | 354 | TLS_CIPHER_AES_GCM_128_REC_SEQ_SIZE); |
3c4d7559 | 355 | release_sock(sk); |
ac55cd61 DC |
356 | if (copy_to_user(optval, |
357 | crypto_info_aes_gcm_128, | |
358 | sizeof(*crypto_info_aes_gcm_128))) | |
359 | rc = -EFAULT; | |
3c4d7559 DW |
360 | break; |
361 | } | |
fb99bce7 DW |
362 | case TLS_CIPHER_AES_GCM_256: { |
363 | struct tls12_crypto_info_aes_gcm_256 * | |
364 | crypto_info_aes_gcm_256 = | |
365 | container_of(crypto_info, | |
366 | struct tls12_crypto_info_aes_gcm_256, | |
367 | info); | |
368 | ||
369 | if (len != sizeof(*crypto_info_aes_gcm_256)) { | |
370 | rc = -EINVAL; | |
371 | goto out; | |
372 | } | |
373 | lock_sock(sk); | |
374 | memcpy(crypto_info_aes_gcm_256->iv, | |
375 | ctx->tx.iv + TLS_CIPHER_AES_GCM_256_SALT_SIZE, | |
376 | TLS_CIPHER_AES_GCM_256_IV_SIZE); | |
377 | memcpy(crypto_info_aes_gcm_256->rec_seq, ctx->tx.rec_seq, | |
378 | TLS_CIPHER_AES_GCM_256_REC_SEQ_SIZE); | |
379 | release_sock(sk); | |
380 | if (copy_to_user(optval, | |
381 | crypto_info_aes_gcm_256, | |
382 | sizeof(*crypto_info_aes_gcm_256))) | |
383 | rc = -EFAULT; | |
384 | break; | |
385 | } | |
3c4d7559 DW |
386 | default: |
387 | rc = -EINVAL; | |
388 | } | |
389 | ||
390 | out: | |
391 | return rc; | |
392 | } | |
393 | ||
394 | static int do_tls_getsockopt(struct sock *sk, int optname, | |
395 | char __user *optval, int __user *optlen) | |
396 | { | |
397 | int rc = 0; | |
398 | ||
399 | switch (optname) { | |
400 | case TLS_TX: | |
401 | rc = do_tls_getsockopt_tx(sk, optval, optlen); | |
402 | break; | |
403 | default: | |
404 | rc = -ENOPROTOOPT; | |
405 | break; | |
406 | } | |
407 | return rc; | |
408 | } | |
409 | ||
410 | static int tls_getsockopt(struct sock *sk, int level, int optname, | |
411 | char __user *optval, int __user *optlen) | |
412 | { | |
413 | struct tls_context *ctx = tls_get_ctx(sk); | |
414 | ||
415 | if (level != SOL_TLS) | |
416 | return ctx->getsockopt(sk, level, optname, optval, optlen); | |
417 | ||
418 | return do_tls_getsockopt(sk, optname, optval, optlen); | |
419 | } | |
420 | ||
c46234eb DW |
421 | static int do_tls_setsockopt_conf(struct sock *sk, char __user *optval, |
422 | unsigned int optlen, int tx) | |
3c4d7559 | 423 | { |
196c31b4 | 424 | struct tls_crypto_info *crypto_info; |
4509de14 | 425 | struct tls_crypto_info *alt_crypto_info; |
3c4d7559 | 426 | struct tls_context *ctx = tls_get_ctx(sk); |
fb99bce7 | 427 | size_t optsize; |
3c4d7559 | 428 | int rc = 0; |
58371585 | 429 | int conf; |
3c4d7559 DW |
430 | |
431 | if (!optval || (optlen < sizeof(*crypto_info))) { | |
432 | rc = -EINVAL; | |
433 | goto out; | |
434 | } | |
435 | ||
4509de14 | 436 | if (tx) { |
86029d10 | 437 | crypto_info = &ctx->crypto_send.info; |
4509de14 VG |
438 | alt_crypto_info = &ctx->crypto_recv.info; |
439 | } else { | |
86029d10 | 440 | crypto_info = &ctx->crypto_recv.info; |
4509de14 VG |
441 | alt_crypto_info = &ctx->crypto_send.info; |
442 | } | |
c46234eb | 443 | |
196c31b4 | 444 | /* Currently we don't support set crypto info more than one time */ |
877d17c7 SD |
445 | if (TLS_CRYPTO_INFO_READY(crypto_info)) { |
446 | rc = -EBUSY; | |
196c31b4 | 447 | goto out; |
877d17c7 | 448 | } |
196c31b4 IL |
449 | |
450 | rc = copy_from_user(crypto_info, optval, sizeof(*crypto_info)); | |
3c4d7559 DW |
451 | if (rc) { |
452 | rc = -EFAULT; | |
257082e6 | 453 | goto err_crypto_info; |
3c4d7559 DW |
454 | } |
455 | ||
456 | /* check version */ | |
130b392c DW |
457 | if (crypto_info->version != TLS_1_2_VERSION && |
458 | crypto_info->version != TLS_1_3_VERSION) { | |
3c4d7559 | 459 | rc = -ENOTSUPP; |
196c31b4 | 460 | goto err_crypto_info; |
3c4d7559 DW |
461 | } |
462 | ||
4509de14 VG |
463 | /* Ensure that TLS version and ciphers are same in both directions */ |
464 | if (TLS_CRYPTO_INFO_READY(alt_crypto_info)) { | |
465 | if (alt_crypto_info->version != crypto_info->version || | |
466 | alt_crypto_info->cipher_type != crypto_info->cipher_type) { | |
467 | rc = -EINVAL; | |
468 | goto err_crypto_info; | |
469 | } | |
470 | } | |
471 | ||
196c31b4 | 472 | switch (crypto_info->cipher_type) { |
fb99bce7 DW |
473 | case TLS_CIPHER_AES_GCM_128: |
474 | case TLS_CIPHER_AES_GCM_256: { | |
475 | optsize = crypto_info->cipher_type == TLS_CIPHER_AES_GCM_128 ? | |
476 | sizeof(struct tls12_crypto_info_aes_gcm_128) : | |
477 | sizeof(struct tls12_crypto_info_aes_gcm_256); | |
478 | if (optlen != optsize) { | |
3c4d7559 | 479 | rc = -EINVAL; |
6db959c8 | 480 | goto err_crypto_info; |
3c4d7559 | 481 | } |
196c31b4 IL |
482 | rc = copy_from_user(crypto_info + 1, optval + sizeof(*crypto_info), |
483 | optlen - sizeof(*crypto_info)); | |
3c4d7559 DW |
484 | if (rc) { |
485 | rc = -EFAULT; | |
486 | goto err_crypto_info; | |
487 | } | |
488 | break; | |
489 | } | |
490 | default: | |
491 | rc = -EINVAL; | |
6db959c8 | 492 | goto err_crypto_info; |
3c4d7559 DW |
493 | } |
494 | ||
c46234eb | 495 | if (tx) { |
e8f69799 IL |
496 | #ifdef CONFIG_TLS_DEVICE |
497 | rc = tls_set_device_offload(sk, ctx); | |
498 | conf = TLS_HW; | |
499 | if (rc) { | |
500 | #else | |
501 | { | |
502 | #endif | |
503 | rc = tls_set_sw_offload(sk, ctx, 1); | |
504 | conf = TLS_SW; | |
505 | } | |
c46234eb | 506 | } else { |
4799ac81 BP |
507 | #ifdef CONFIG_TLS_DEVICE |
508 | rc = tls_set_device_offload_rx(sk, ctx); | |
509 | conf = TLS_HW; | |
510 | if (rc) { | |
511 | #else | |
512 | { | |
513 | #endif | |
514 | rc = tls_set_sw_offload(sk, ctx, 0); | |
515 | conf = TLS_SW; | |
516 | } | |
c46234eb DW |
517 | } |
518 | ||
3c4d7559 DW |
519 | if (rc) |
520 | goto err_crypto_info; | |
521 | ||
f66de3ee BP |
522 | if (tx) |
523 | ctx->tx_conf = conf; | |
524 | else | |
525 | ctx->rx_conf = conf; | |
6d88207f | 526 | update_sk_prot(sk, ctx); |
c46234eb DW |
527 | if (tx) { |
528 | ctx->sk_write_space = sk->sk_write_space; | |
529 | sk->sk_write_space = tls_write_space; | |
530 | } else { | |
531 | sk->sk_socket->ops = &tls_sw_proto_ops; | |
532 | } | |
3c4d7559 DW |
533 | goto out; |
534 | ||
535 | err_crypto_info: | |
c844eb46 | 536 | memzero_explicit(crypto_info, sizeof(union tls_crypto_context)); |
3c4d7559 DW |
537 | out: |
538 | return rc; | |
539 | } | |
540 | ||
541 | static int do_tls_setsockopt(struct sock *sk, int optname, | |
542 | char __user *optval, unsigned int optlen) | |
543 | { | |
544 | int rc = 0; | |
545 | ||
546 | switch (optname) { | |
547 | case TLS_TX: | |
c46234eb | 548 | case TLS_RX: |
3c4d7559 | 549 | lock_sock(sk); |
c46234eb DW |
550 | rc = do_tls_setsockopt_conf(sk, optval, optlen, |
551 | optname == TLS_TX); | |
3c4d7559 DW |
552 | release_sock(sk); |
553 | break; | |
554 | default: | |
555 | rc = -ENOPROTOOPT; | |
556 | break; | |
557 | } | |
558 | return rc; | |
559 | } | |
560 | ||
561 | static int tls_setsockopt(struct sock *sk, int level, int optname, | |
562 | char __user *optval, unsigned int optlen) | |
563 | { | |
564 | struct tls_context *ctx = tls_get_ctx(sk); | |
565 | ||
566 | if (level != SOL_TLS) | |
567 | return ctx->setsockopt(sk, level, optname, optval, optlen); | |
568 | ||
569 | return do_tls_setsockopt(sk, optname, optval, optlen); | |
570 | } | |
571 | ||
dd0bed16 AG |
572 | static struct tls_context *create_ctx(struct sock *sk) |
573 | { | |
574 | struct inet_connection_sock *icsk = inet_csk(sk); | |
575 | struct tls_context *ctx; | |
576 | ||
c6ec179a | 577 | ctx = kzalloc(sizeof(*ctx), GFP_ATOMIC); |
dd0bed16 AG |
578 | if (!ctx) |
579 | return NULL; | |
580 | ||
581 | icsk->icsk_ulp_data = ctx; | |
6c0563e4 AG |
582 | ctx->setsockopt = sk->sk_prot->setsockopt; |
583 | ctx->getsockopt = sk->sk_prot->getsockopt; | |
584 | ctx->sk_proto_close = sk->sk_prot->close; | |
dd0bed16 AG |
585 | return ctx; |
586 | } | |
587 | ||
63a6b3fe AG |
588 | static void tls_build_proto(struct sock *sk) |
589 | { | |
590 | int ip_ver = sk->sk_family == AF_INET6 ? TLSV6 : TLSV4; | |
591 | ||
592 | /* Build IPv6 TLS whenever the address of tcpv6 _prot changes */ | |
593 | if (ip_ver == TLSV6 && | |
594 | unlikely(sk->sk_prot != smp_load_acquire(&saved_tcpv6_prot))) { | |
595 | mutex_lock(&tcpv6_prot_mutex); | |
596 | if (likely(sk->sk_prot != saved_tcpv6_prot)) { | |
597 | build_protos(tls_prots[TLSV6], sk->sk_prot); | |
598 | smp_store_release(&saved_tcpv6_prot, sk->sk_prot); | |
599 | } | |
600 | mutex_unlock(&tcpv6_prot_mutex); | |
601 | } | |
602 | ||
603 | if (ip_ver == TLSV4 && | |
604 | unlikely(sk->sk_prot != smp_load_acquire(&saved_tcpv4_prot))) { | |
605 | mutex_lock(&tcpv4_prot_mutex); | |
606 | if (likely(sk->sk_prot != saved_tcpv4_prot)) { | |
607 | build_protos(tls_prots[TLSV4], sk->sk_prot); | |
608 | smp_store_release(&saved_tcpv4_prot, sk->sk_prot); | |
609 | } | |
610 | mutex_unlock(&tcpv4_prot_mutex); | |
611 | } | |
612 | } | |
613 | ||
76f7164d AG |
614 | static void tls_hw_sk_destruct(struct sock *sk) |
615 | { | |
616 | struct tls_context *ctx = tls_get_ctx(sk); | |
617 | struct inet_connection_sock *icsk = inet_csk(sk); | |
618 | ||
619 | ctx->sk_destruct(sk); | |
620 | /* Free ctx */ | |
621 | kfree(ctx); | |
622 | icsk->icsk_ulp_data = NULL; | |
623 | } | |
624 | ||
dd0bed16 AG |
625 | static int tls_hw_prot(struct sock *sk) |
626 | { | |
627 | struct tls_context *ctx; | |
628 | struct tls_device *dev; | |
629 | int rc = 0; | |
630 | ||
df9d4a17 | 631 | spin_lock_bh(&device_spinlock); |
dd0bed16 AG |
632 | list_for_each_entry(dev, &device_list, dev_list) { |
633 | if (dev->feature && dev->feature(dev)) { | |
634 | ctx = create_ctx(sk); | |
635 | if (!ctx) | |
636 | goto out; | |
637 | ||
63a6b3fe AG |
638 | spin_unlock_bh(&device_spinlock); |
639 | tls_build_proto(sk); | |
dd0bed16 AG |
640 | ctx->hash = sk->sk_prot->hash; |
641 | ctx->unhash = sk->sk_prot->unhash; | |
642 | ctx->sk_proto_close = sk->sk_prot->close; | |
76f7164d AG |
643 | ctx->sk_destruct = sk->sk_destruct; |
644 | sk->sk_destruct = tls_hw_sk_destruct; | |
f66de3ee BP |
645 | ctx->rx_conf = TLS_HW_RECORD; |
646 | ctx->tx_conf = TLS_HW_RECORD; | |
dd0bed16 | 647 | update_sk_prot(sk, ctx); |
63a6b3fe | 648 | spin_lock_bh(&device_spinlock); |
dd0bed16 AG |
649 | rc = 1; |
650 | break; | |
651 | } | |
652 | } | |
653 | out: | |
df9d4a17 | 654 | spin_unlock_bh(&device_spinlock); |
dd0bed16 AG |
655 | return rc; |
656 | } | |
657 | ||
658 | static void tls_hw_unhash(struct sock *sk) | |
659 | { | |
660 | struct tls_context *ctx = tls_get_ctx(sk); | |
661 | struct tls_device *dev; | |
662 | ||
df9d4a17 | 663 | spin_lock_bh(&device_spinlock); |
dd0bed16 | 664 | list_for_each_entry(dev, &device_list, dev_list) { |
df9d4a17 AG |
665 | if (dev->unhash) { |
666 | kref_get(&dev->kref); | |
667 | spin_unlock_bh(&device_spinlock); | |
dd0bed16 | 668 | dev->unhash(dev, sk); |
df9d4a17 AG |
669 | kref_put(&dev->kref, dev->release); |
670 | spin_lock_bh(&device_spinlock); | |
671 | } | |
dd0bed16 | 672 | } |
df9d4a17 | 673 | spin_unlock_bh(&device_spinlock); |
dd0bed16 AG |
674 | ctx->unhash(sk); |
675 | } | |
676 | ||
677 | static int tls_hw_hash(struct sock *sk) | |
678 | { | |
679 | struct tls_context *ctx = tls_get_ctx(sk); | |
680 | struct tls_device *dev; | |
681 | int err; | |
682 | ||
683 | err = ctx->hash(sk); | |
df9d4a17 | 684 | spin_lock_bh(&device_spinlock); |
dd0bed16 | 685 | list_for_each_entry(dev, &device_list, dev_list) { |
df9d4a17 AG |
686 | if (dev->hash) { |
687 | kref_get(&dev->kref); | |
688 | spin_unlock_bh(&device_spinlock); | |
dd0bed16 | 689 | err |= dev->hash(dev, sk); |
df9d4a17 AG |
690 | kref_put(&dev->kref, dev->release); |
691 | spin_lock_bh(&device_spinlock); | |
692 | } | |
dd0bed16 | 693 | } |
df9d4a17 | 694 | spin_unlock_bh(&device_spinlock); |
dd0bed16 AG |
695 | |
696 | if (err) | |
697 | tls_hw_unhash(sk); | |
698 | return err; | |
699 | } | |
700 | ||
f66de3ee BP |
701 | static void build_protos(struct proto prot[TLS_NUM_CONFIG][TLS_NUM_CONFIG], |
702 | struct proto *base) | |
c113187d | 703 | { |
f66de3ee BP |
704 | prot[TLS_BASE][TLS_BASE] = *base; |
705 | prot[TLS_BASE][TLS_BASE].setsockopt = tls_setsockopt; | |
706 | prot[TLS_BASE][TLS_BASE].getsockopt = tls_getsockopt; | |
707 | prot[TLS_BASE][TLS_BASE].close = tls_sk_proto_close; | |
708 | ||
709 | prot[TLS_SW][TLS_BASE] = prot[TLS_BASE][TLS_BASE]; | |
710 | prot[TLS_SW][TLS_BASE].sendmsg = tls_sw_sendmsg; | |
711 | prot[TLS_SW][TLS_BASE].sendpage = tls_sw_sendpage; | |
712 | ||
713 | prot[TLS_BASE][TLS_SW] = prot[TLS_BASE][TLS_BASE]; | |
924ad65e JF |
714 | prot[TLS_BASE][TLS_SW].recvmsg = tls_sw_recvmsg; |
715 | prot[TLS_BASE][TLS_SW].stream_memory_read = tls_sw_stream_read; | |
716 | prot[TLS_BASE][TLS_SW].close = tls_sk_proto_close; | |
f66de3ee BP |
717 | |
718 | prot[TLS_SW][TLS_SW] = prot[TLS_SW][TLS_BASE]; | |
924ad65e JF |
719 | prot[TLS_SW][TLS_SW].recvmsg = tls_sw_recvmsg; |
720 | prot[TLS_SW][TLS_SW].stream_memory_read = tls_sw_stream_read; | |
721 | prot[TLS_SW][TLS_SW].close = tls_sk_proto_close; | |
f66de3ee | 722 | |
e8f69799 IL |
723 | #ifdef CONFIG_TLS_DEVICE |
724 | prot[TLS_HW][TLS_BASE] = prot[TLS_BASE][TLS_BASE]; | |
725 | prot[TLS_HW][TLS_BASE].sendmsg = tls_device_sendmsg; | |
726 | prot[TLS_HW][TLS_BASE].sendpage = tls_device_sendpage; | |
727 | ||
728 | prot[TLS_HW][TLS_SW] = prot[TLS_BASE][TLS_SW]; | |
729 | prot[TLS_HW][TLS_SW].sendmsg = tls_device_sendmsg; | |
730 | prot[TLS_HW][TLS_SW].sendpage = tls_device_sendpage; | |
4799ac81 BP |
731 | |
732 | prot[TLS_BASE][TLS_HW] = prot[TLS_BASE][TLS_SW]; | |
733 | ||
734 | prot[TLS_SW][TLS_HW] = prot[TLS_SW][TLS_SW]; | |
735 | ||
736 | prot[TLS_HW][TLS_HW] = prot[TLS_HW][TLS_SW]; | |
e8f69799 IL |
737 | #endif |
738 | ||
f66de3ee BP |
739 | prot[TLS_HW_RECORD][TLS_HW_RECORD] = *base; |
740 | prot[TLS_HW_RECORD][TLS_HW_RECORD].hash = tls_hw_hash; | |
741 | prot[TLS_HW_RECORD][TLS_HW_RECORD].unhash = tls_hw_unhash; | |
742 | prot[TLS_HW_RECORD][TLS_HW_RECORD].close = tls_sk_proto_close; | |
c113187d BP |
743 | } |
744 | ||
3c4d7559 DW |
745 | static int tls_init(struct sock *sk) |
746 | { | |
3c4d7559 DW |
747 | struct tls_context *ctx; |
748 | int rc = 0; | |
749 | ||
dd0bed16 AG |
750 | if (tls_hw_prot(sk)) |
751 | goto out; | |
752 | ||
d91c3e17 IL |
753 | /* The TLS ulp is currently supported only for TCP sockets |
754 | * in ESTABLISHED state. | |
755 | * Supporting sockets in LISTEN state will require us | |
756 | * to modify the accept implementation to clone rather then | |
757 | * share the ulp context. | |
758 | */ | |
759 | if (sk->sk_state != TCP_ESTABLISHED) | |
760 | return -ENOTSUPP; | |
761 | ||
3c4d7559 | 762 | /* allocate tls context */ |
dd0bed16 | 763 | ctx = create_ctx(sk); |
3c4d7559 DW |
764 | if (!ctx) { |
765 | rc = -ENOMEM; | |
766 | goto out; | |
767 | } | |
6d88207f | 768 | |
63a6b3fe | 769 | tls_build_proto(sk); |
f66de3ee BP |
770 | ctx->tx_conf = TLS_BASE; |
771 | ctx->rx_conf = TLS_BASE; | |
6d88207f | 772 | update_sk_prot(sk, ctx); |
3c4d7559 DW |
773 | out: |
774 | return rc; | |
775 | } | |
776 | ||
dd0bed16 AG |
777 | void tls_register_device(struct tls_device *device) |
778 | { | |
df9d4a17 | 779 | spin_lock_bh(&device_spinlock); |
dd0bed16 | 780 | list_add_tail(&device->dev_list, &device_list); |
df9d4a17 | 781 | spin_unlock_bh(&device_spinlock); |
dd0bed16 AG |
782 | } |
783 | EXPORT_SYMBOL(tls_register_device); | |
784 | ||
785 | void tls_unregister_device(struct tls_device *device) | |
786 | { | |
df9d4a17 | 787 | spin_lock_bh(&device_spinlock); |
dd0bed16 | 788 | list_del(&device->dev_list); |
df9d4a17 | 789 | spin_unlock_bh(&device_spinlock); |
dd0bed16 AG |
790 | } |
791 | EXPORT_SYMBOL(tls_unregister_device); | |
792 | ||
3c4d7559 DW |
793 | static struct tcp_ulp_ops tcp_tls_ulp_ops __read_mostly = { |
794 | .name = "tls", | |
795 | .owner = THIS_MODULE, | |
796 | .init = tls_init, | |
797 | }; | |
798 | ||
799 | static int __init tls_register(void) | |
800 | { | |
c46234eb | 801 | tls_sw_proto_ops = inet_stream_ops; |
c46234eb DW |
802 | tls_sw_proto_ops.splice_read = tls_sw_splice_read; |
803 | ||
e8f69799 IL |
804 | #ifdef CONFIG_TLS_DEVICE |
805 | tls_device_init(); | |
806 | #endif | |
3c4d7559 DW |
807 | tcp_register_ulp(&tcp_tls_ulp_ops); |
808 | ||
809 | return 0; | |
810 | } | |
811 | ||
812 | static void __exit tls_unregister(void) | |
813 | { | |
814 | tcp_unregister_ulp(&tcp_tls_ulp_ops); | |
e8f69799 IL |
815 | #ifdef CONFIG_TLS_DEVICE |
816 | tls_device_cleanup(); | |
817 | #endif | |
3c4d7559 DW |
818 | } |
819 | ||
820 | module_init(tls_register); | |
821 | module_exit(tls_unregister); |