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 | 148 | ctx->in_tcp_sendpages = false; |
3c4d7559 DW |
149 | |
150 | return 0; | |
151 | } | |
152 | ||
153 | static int tls_handle_open_record(struct sock *sk, int flags) | |
154 | { | |
155 | struct tls_context *ctx = tls_get_ctx(sk); | |
156 | ||
157 | if (tls_is_pending_open_record(ctx)) | |
158 | return ctx->push_pending_record(sk, flags); | |
159 | ||
160 | return 0; | |
161 | } | |
162 | ||
163 | int tls_proccess_cmsg(struct sock *sk, struct msghdr *msg, | |
164 | unsigned char *record_type) | |
165 | { | |
166 | struct cmsghdr *cmsg; | |
167 | int rc = -EINVAL; | |
168 | ||
169 | for_each_cmsghdr(cmsg, msg) { | |
170 | if (!CMSG_OK(msg, cmsg)) | |
171 | return -EINVAL; | |
172 | if (cmsg->cmsg_level != SOL_TLS) | |
173 | continue; | |
174 | ||
175 | switch (cmsg->cmsg_type) { | |
176 | case TLS_SET_RECORD_TYPE: | |
177 | if (cmsg->cmsg_len < CMSG_LEN(sizeof(*record_type))) | |
178 | return -EINVAL; | |
179 | ||
180 | if (msg->msg_flags & MSG_MORE) | |
181 | return -EINVAL; | |
182 | ||
183 | rc = tls_handle_open_record(sk, msg->msg_flags); | |
184 | if (rc) | |
185 | return rc; | |
186 | ||
187 | *record_type = *(unsigned char *)CMSG_DATA(cmsg); | |
188 | rc = 0; | |
189 | break; | |
190 | default: | |
191 | return -EINVAL; | |
192 | } | |
193 | } | |
194 | ||
195 | return rc; | |
196 | } | |
197 | ||
a42055e8 VG |
198 | int tls_push_partial_record(struct sock *sk, struct tls_context *ctx, |
199 | int flags) | |
3c4d7559 DW |
200 | { |
201 | struct scatterlist *sg; | |
202 | u16 offset; | |
203 | ||
3c4d7559 DW |
204 | sg = ctx->partially_sent_record; |
205 | offset = ctx->partially_sent_offset; | |
206 | ||
207 | ctx->partially_sent_record = NULL; | |
208 | return tls_push_sg(sk, ctx, sg, offset, flags); | |
209 | } | |
210 | ||
35b71a34 JK |
211 | bool tls_free_partial_record(struct sock *sk, struct tls_context *ctx) |
212 | { | |
213 | struct scatterlist *sg; | |
214 | ||
215 | sg = ctx->partially_sent_record; | |
216 | if (!sg) | |
217 | return false; | |
218 | ||
219 | while (1) { | |
220 | put_page(sg_page(sg)); | |
221 | sk_mem_uncharge(sk, sg->length); | |
222 | ||
223 | if (sg_is_last(sg)) | |
224 | break; | |
225 | sg++; | |
226 | } | |
227 | ctx->partially_sent_record = NULL; | |
228 | return true; | |
229 | } | |
230 | ||
3c4d7559 DW |
231 | static void tls_write_space(struct sock *sk) |
232 | { | |
233 | struct tls_context *ctx = tls_get_ctx(sk); | |
234 | ||
67db7cd2 JF |
235 | /* If in_tcp_sendpages call lower protocol write space handler |
236 | * to ensure we wake up any waiting operations there. For example | |
237 | * if do_tcp_sendpages where to call sk_wait_event. | |
238 | */ | |
239 | if (ctx->in_tcp_sendpages) { | |
240 | ctx->sk_write_space(sk); | |
c212d2c7 | 241 | return; |
67db7cd2 | 242 | } |
c212d2c7 | 243 | |
7463d3a2 BP |
244 | #ifdef CONFIG_TLS_DEVICE |
245 | if (ctx->tx_conf == TLS_HW) | |
246 | tls_device_write_space(sk, ctx); | |
247 | else | |
248 | #endif | |
249 | tls_sw_write_space(sk, ctx); | |
4504ab0e VG |
250 | |
251 | ctx->sk_write_space(sk); | |
3c4d7559 DW |
252 | } |
253 | ||
acd3e96d | 254 | void tls_ctx_free(struct tls_context *ctx) |
86029d10 SD |
255 | { |
256 | if (!ctx) | |
257 | return; | |
258 | ||
259 | memzero_explicit(&ctx->crypto_send, sizeof(ctx->crypto_send)); | |
260 | memzero_explicit(&ctx->crypto_recv, sizeof(ctx->crypto_recv)); | |
261 | kfree(ctx); | |
262 | } | |
263 | ||
3c4d7559 DW |
264 | static void tls_sk_proto_close(struct sock *sk, long timeout) |
265 | { | |
266 | struct tls_context *ctx = tls_get_ctx(sk); | |
267 | long timeo = sock_sndtimeo(sk, 0); | |
268 | void (*sk_proto_close)(struct sock *sk, long timeout); | |
98f0a395 | 269 | bool free_ctx = false; |
3c4d7559 DW |
270 | |
271 | lock_sock(sk); | |
ff45d820 IL |
272 | sk_proto_close = ctx->sk_proto_close; |
273 | ||
76f7164d AG |
274 | if (ctx->tx_conf == TLS_HW_RECORD && ctx->rx_conf == TLS_HW_RECORD) |
275 | goto skip_tx_cleanup; | |
276 | ||
277 | if (ctx->tx_conf == TLS_BASE && ctx->rx_conf == TLS_BASE) { | |
98f0a395 | 278 | free_ctx = true; |
ff45d820 IL |
279 | goto skip_tx_cleanup; |
280 | } | |
3c4d7559 | 281 | |
9354544c DM |
282 | if (unlikely(sk->sk_write_pending) && |
283 | !wait_on_pending_writer(sk, &timeo)) | |
3c4d7559 DW |
284 | tls_handle_open_record(sk, 0); |
285 | ||
f66de3ee BP |
286 | /* We need these for tls_sw_fallback handling of other packets */ |
287 | if (ctx->tx_conf == TLS_SW) { | |
288 | kfree(ctx->tx.rec_seq); | |
289 | kfree(ctx->tx.iv); | |
290 | tls_sw_free_resources_tx(sk); | |
903f1a18 | 291 | #ifdef CONFIG_TLS_DEVICE |
35b71a34 JK |
292 | } else if (ctx->tx_conf == TLS_HW) { |
293 | tls_device_free_resources_tx(sk); | |
903f1a18 | 294 | #endif |
f66de3ee | 295 | } |
3c4d7559 | 296 | |
12c76861 | 297 | if (ctx->rx_conf == TLS_SW) |
f66de3ee | 298 | tls_sw_free_resources_rx(sk); |
3c4d7559 | 299 | |
e8f69799 | 300 | #ifdef CONFIG_TLS_DEVICE |
4799ac81 BP |
301 | if (ctx->rx_conf == TLS_HW) |
302 | tls_device_offload_cleanup_rx(sk); | |
303 | ||
304 | if (ctx->tx_conf != TLS_HW && ctx->rx_conf != TLS_HW) { | |
e8f69799 IL |
305 | #else |
306 | { | |
307 | #endif | |
86029d10 | 308 | tls_ctx_free(ctx); |
e8f69799 IL |
309 | ctx = NULL; |
310 | } | |
311 | ||
ff45d820 | 312 | skip_tx_cleanup: |
3c4d7559 DW |
313 | release_sock(sk); |
314 | sk_proto_close(sk, timeout); | |
dd0bed16 AG |
315 | /* free ctx for TLS_HW_RECORD, used by tcp_set_state |
316 | * for sk->sk_prot->unhash [tls_hw_unhash] | |
317 | */ | |
98f0a395 | 318 | if (free_ctx) |
86029d10 | 319 | tls_ctx_free(ctx); |
3c4d7559 DW |
320 | } |
321 | ||
322 | static int do_tls_getsockopt_tx(struct sock *sk, char __user *optval, | |
323 | int __user *optlen) | |
324 | { | |
325 | int rc = 0; | |
326 | struct tls_context *ctx = tls_get_ctx(sk); | |
327 | struct tls_crypto_info *crypto_info; | |
328 | int len; | |
329 | ||
330 | if (get_user(len, optlen)) | |
331 | return -EFAULT; | |
332 | ||
333 | if (!optval || (len < sizeof(*crypto_info))) { | |
334 | rc = -EINVAL; | |
335 | goto out; | |
336 | } | |
337 | ||
338 | if (!ctx) { | |
339 | rc = -EBUSY; | |
340 | goto out; | |
341 | } | |
342 | ||
343 | /* get user crypto info */ | |
86029d10 | 344 | crypto_info = &ctx->crypto_send.info; |
3c4d7559 DW |
345 | |
346 | if (!TLS_CRYPTO_INFO_READY(crypto_info)) { | |
347 | rc = -EBUSY; | |
348 | goto out; | |
349 | } | |
350 | ||
5a3b886c | 351 | if (len == sizeof(*crypto_info)) { |
ac55cd61 DC |
352 | if (copy_to_user(optval, crypto_info, sizeof(*crypto_info))) |
353 | rc = -EFAULT; | |
3c4d7559 DW |
354 | goto out; |
355 | } | |
356 | ||
357 | switch (crypto_info->cipher_type) { | |
358 | case TLS_CIPHER_AES_GCM_128: { | |
359 | struct tls12_crypto_info_aes_gcm_128 * | |
360 | crypto_info_aes_gcm_128 = | |
361 | container_of(crypto_info, | |
362 | struct tls12_crypto_info_aes_gcm_128, | |
363 | info); | |
364 | ||
365 | if (len != sizeof(*crypto_info_aes_gcm_128)) { | |
366 | rc = -EINVAL; | |
367 | goto out; | |
368 | } | |
369 | lock_sock(sk); | |
a1dfa681 | 370 | memcpy(crypto_info_aes_gcm_128->iv, |
dbe42559 | 371 | ctx->tx.iv + TLS_CIPHER_AES_GCM_128_SALT_SIZE, |
3c4d7559 | 372 | TLS_CIPHER_AES_GCM_128_IV_SIZE); |
dbe42559 | 373 | memcpy(crypto_info_aes_gcm_128->rec_seq, ctx->tx.rec_seq, |
c410c196 | 374 | TLS_CIPHER_AES_GCM_128_REC_SEQ_SIZE); |
3c4d7559 | 375 | release_sock(sk); |
ac55cd61 DC |
376 | if (copy_to_user(optval, |
377 | crypto_info_aes_gcm_128, | |
378 | sizeof(*crypto_info_aes_gcm_128))) | |
379 | rc = -EFAULT; | |
3c4d7559 DW |
380 | break; |
381 | } | |
fb99bce7 DW |
382 | case TLS_CIPHER_AES_GCM_256: { |
383 | struct tls12_crypto_info_aes_gcm_256 * | |
384 | crypto_info_aes_gcm_256 = | |
385 | container_of(crypto_info, | |
386 | struct tls12_crypto_info_aes_gcm_256, | |
387 | info); | |
388 | ||
389 | if (len != sizeof(*crypto_info_aes_gcm_256)) { | |
390 | rc = -EINVAL; | |
391 | goto out; | |
392 | } | |
393 | lock_sock(sk); | |
394 | memcpy(crypto_info_aes_gcm_256->iv, | |
395 | ctx->tx.iv + TLS_CIPHER_AES_GCM_256_SALT_SIZE, | |
396 | TLS_CIPHER_AES_GCM_256_IV_SIZE); | |
397 | memcpy(crypto_info_aes_gcm_256->rec_seq, ctx->tx.rec_seq, | |
398 | TLS_CIPHER_AES_GCM_256_REC_SEQ_SIZE); | |
399 | release_sock(sk); | |
400 | if (copy_to_user(optval, | |
401 | crypto_info_aes_gcm_256, | |
402 | sizeof(*crypto_info_aes_gcm_256))) | |
403 | rc = -EFAULT; | |
404 | break; | |
405 | } | |
3c4d7559 DW |
406 | default: |
407 | rc = -EINVAL; | |
408 | } | |
409 | ||
410 | out: | |
411 | return rc; | |
412 | } | |
413 | ||
414 | static int do_tls_getsockopt(struct sock *sk, int optname, | |
415 | char __user *optval, int __user *optlen) | |
416 | { | |
417 | int rc = 0; | |
418 | ||
419 | switch (optname) { | |
420 | case TLS_TX: | |
421 | rc = do_tls_getsockopt_tx(sk, optval, optlen); | |
422 | break; | |
423 | default: | |
424 | rc = -ENOPROTOOPT; | |
425 | break; | |
426 | } | |
427 | return rc; | |
428 | } | |
429 | ||
430 | static int tls_getsockopt(struct sock *sk, int level, int optname, | |
431 | char __user *optval, int __user *optlen) | |
432 | { | |
433 | struct tls_context *ctx = tls_get_ctx(sk); | |
434 | ||
435 | if (level != SOL_TLS) | |
436 | return ctx->getsockopt(sk, level, optname, optval, optlen); | |
437 | ||
438 | return do_tls_getsockopt(sk, optname, optval, optlen); | |
439 | } | |
440 | ||
c46234eb DW |
441 | static int do_tls_setsockopt_conf(struct sock *sk, char __user *optval, |
442 | unsigned int optlen, int tx) | |
3c4d7559 | 443 | { |
196c31b4 | 444 | struct tls_crypto_info *crypto_info; |
4509de14 | 445 | struct tls_crypto_info *alt_crypto_info; |
3c4d7559 | 446 | struct tls_context *ctx = tls_get_ctx(sk); |
fb99bce7 | 447 | size_t optsize; |
3c4d7559 | 448 | int rc = 0; |
58371585 | 449 | int conf; |
3c4d7559 DW |
450 | |
451 | if (!optval || (optlen < sizeof(*crypto_info))) { | |
452 | rc = -EINVAL; | |
453 | goto out; | |
454 | } | |
455 | ||
4509de14 | 456 | if (tx) { |
86029d10 | 457 | crypto_info = &ctx->crypto_send.info; |
4509de14 VG |
458 | alt_crypto_info = &ctx->crypto_recv.info; |
459 | } else { | |
86029d10 | 460 | crypto_info = &ctx->crypto_recv.info; |
4509de14 VG |
461 | alt_crypto_info = &ctx->crypto_send.info; |
462 | } | |
c46234eb | 463 | |
196c31b4 | 464 | /* Currently we don't support set crypto info more than one time */ |
877d17c7 SD |
465 | if (TLS_CRYPTO_INFO_READY(crypto_info)) { |
466 | rc = -EBUSY; | |
196c31b4 | 467 | goto out; |
877d17c7 | 468 | } |
196c31b4 IL |
469 | |
470 | rc = copy_from_user(crypto_info, optval, sizeof(*crypto_info)); | |
3c4d7559 DW |
471 | if (rc) { |
472 | rc = -EFAULT; | |
257082e6 | 473 | goto err_crypto_info; |
3c4d7559 DW |
474 | } |
475 | ||
476 | /* check version */ | |
130b392c DW |
477 | if (crypto_info->version != TLS_1_2_VERSION && |
478 | crypto_info->version != TLS_1_3_VERSION) { | |
3c4d7559 | 479 | rc = -ENOTSUPP; |
196c31b4 | 480 | goto err_crypto_info; |
3c4d7559 DW |
481 | } |
482 | ||
4509de14 VG |
483 | /* Ensure that TLS version and ciphers are same in both directions */ |
484 | if (TLS_CRYPTO_INFO_READY(alt_crypto_info)) { | |
485 | if (alt_crypto_info->version != crypto_info->version || | |
486 | alt_crypto_info->cipher_type != crypto_info->cipher_type) { | |
487 | rc = -EINVAL; | |
488 | goto err_crypto_info; | |
489 | } | |
490 | } | |
491 | ||
196c31b4 | 492 | switch (crypto_info->cipher_type) { |
fb99bce7 | 493 | case TLS_CIPHER_AES_GCM_128: |
f295b3ae VG |
494 | optsize = sizeof(struct tls12_crypto_info_aes_gcm_128); |
495 | break; | |
fb99bce7 | 496 | case TLS_CIPHER_AES_GCM_256: { |
f295b3ae | 497 | optsize = sizeof(struct tls12_crypto_info_aes_gcm_256); |
3c4d7559 DW |
498 | break; |
499 | } | |
f295b3ae VG |
500 | case TLS_CIPHER_AES_CCM_128: |
501 | optsize = sizeof(struct tls12_crypto_info_aes_ccm_128); | |
502 | break; | |
3c4d7559 DW |
503 | default: |
504 | rc = -EINVAL; | |
6db959c8 | 505 | goto err_crypto_info; |
3c4d7559 DW |
506 | } |
507 | ||
f295b3ae VG |
508 | if (optlen != optsize) { |
509 | rc = -EINVAL; | |
510 | goto err_crypto_info; | |
511 | } | |
512 | ||
513 | rc = copy_from_user(crypto_info + 1, optval + sizeof(*crypto_info), | |
514 | optlen - sizeof(*crypto_info)); | |
515 | if (rc) { | |
516 | rc = -EFAULT; | |
517 | goto err_crypto_info; | |
518 | } | |
519 | ||
c46234eb | 520 | if (tx) { |
e8f69799 IL |
521 | #ifdef CONFIG_TLS_DEVICE |
522 | rc = tls_set_device_offload(sk, ctx); | |
523 | conf = TLS_HW; | |
524 | if (rc) { | |
525 | #else | |
526 | { | |
527 | #endif | |
528 | rc = tls_set_sw_offload(sk, ctx, 1); | |
529 | conf = TLS_SW; | |
530 | } | |
c46234eb | 531 | } else { |
4799ac81 BP |
532 | #ifdef CONFIG_TLS_DEVICE |
533 | rc = tls_set_device_offload_rx(sk, ctx); | |
534 | conf = TLS_HW; | |
535 | if (rc) { | |
536 | #else | |
537 | { | |
538 | #endif | |
539 | rc = tls_set_sw_offload(sk, ctx, 0); | |
540 | conf = TLS_SW; | |
541 | } | |
c46234eb DW |
542 | } |
543 | ||
3c4d7559 DW |
544 | if (rc) |
545 | goto err_crypto_info; | |
546 | ||
f66de3ee BP |
547 | if (tx) |
548 | ctx->tx_conf = conf; | |
549 | else | |
550 | ctx->rx_conf = conf; | |
6d88207f | 551 | update_sk_prot(sk, ctx); |
c46234eb DW |
552 | if (tx) { |
553 | ctx->sk_write_space = sk->sk_write_space; | |
554 | sk->sk_write_space = tls_write_space; | |
555 | } else { | |
556 | sk->sk_socket->ops = &tls_sw_proto_ops; | |
557 | } | |
3c4d7559 DW |
558 | goto out; |
559 | ||
560 | err_crypto_info: | |
c844eb46 | 561 | memzero_explicit(crypto_info, sizeof(union tls_crypto_context)); |
3c4d7559 DW |
562 | out: |
563 | return rc; | |
564 | } | |
565 | ||
566 | static int do_tls_setsockopt(struct sock *sk, int optname, | |
567 | char __user *optval, unsigned int optlen) | |
568 | { | |
569 | int rc = 0; | |
570 | ||
571 | switch (optname) { | |
572 | case TLS_TX: | |
c46234eb | 573 | case TLS_RX: |
3c4d7559 | 574 | lock_sock(sk); |
c46234eb DW |
575 | rc = do_tls_setsockopt_conf(sk, optval, optlen, |
576 | optname == TLS_TX); | |
3c4d7559 DW |
577 | release_sock(sk); |
578 | break; | |
579 | default: | |
580 | rc = -ENOPROTOOPT; | |
581 | break; | |
582 | } | |
583 | return rc; | |
584 | } | |
585 | ||
586 | static int tls_setsockopt(struct sock *sk, int level, int optname, | |
587 | char __user *optval, unsigned int optlen) | |
588 | { | |
589 | struct tls_context *ctx = tls_get_ctx(sk); | |
590 | ||
591 | if (level != SOL_TLS) | |
592 | return ctx->setsockopt(sk, level, optname, optval, optlen); | |
593 | ||
594 | return do_tls_setsockopt(sk, optname, optval, optlen); | |
595 | } | |
596 | ||
dd0bed16 AG |
597 | static struct tls_context *create_ctx(struct sock *sk) |
598 | { | |
599 | struct inet_connection_sock *icsk = inet_csk(sk); | |
600 | struct tls_context *ctx; | |
601 | ||
c6ec179a | 602 | ctx = kzalloc(sizeof(*ctx), GFP_ATOMIC); |
dd0bed16 AG |
603 | if (!ctx) |
604 | return NULL; | |
605 | ||
606 | icsk->icsk_ulp_data = ctx; | |
6c0563e4 AG |
607 | ctx->setsockopt = sk->sk_prot->setsockopt; |
608 | ctx->getsockopt = sk->sk_prot->getsockopt; | |
609 | ctx->sk_proto_close = sk->sk_prot->close; | |
dd0bed16 AG |
610 | return ctx; |
611 | } | |
612 | ||
63a6b3fe AG |
613 | static void tls_build_proto(struct sock *sk) |
614 | { | |
615 | int ip_ver = sk->sk_family == AF_INET6 ? TLSV6 : TLSV4; | |
616 | ||
617 | /* Build IPv6 TLS whenever the address of tcpv6 _prot changes */ | |
618 | if (ip_ver == TLSV6 && | |
619 | unlikely(sk->sk_prot != smp_load_acquire(&saved_tcpv6_prot))) { | |
620 | mutex_lock(&tcpv6_prot_mutex); | |
621 | if (likely(sk->sk_prot != saved_tcpv6_prot)) { | |
622 | build_protos(tls_prots[TLSV6], sk->sk_prot); | |
623 | smp_store_release(&saved_tcpv6_prot, sk->sk_prot); | |
624 | } | |
625 | mutex_unlock(&tcpv6_prot_mutex); | |
626 | } | |
627 | ||
628 | if (ip_ver == TLSV4 && | |
629 | unlikely(sk->sk_prot != smp_load_acquire(&saved_tcpv4_prot))) { | |
630 | mutex_lock(&tcpv4_prot_mutex); | |
631 | if (likely(sk->sk_prot != saved_tcpv4_prot)) { | |
632 | build_protos(tls_prots[TLSV4], sk->sk_prot); | |
633 | smp_store_release(&saved_tcpv4_prot, sk->sk_prot); | |
634 | } | |
635 | mutex_unlock(&tcpv4_prot_mutex); | |
636 | } | |
637 | } | |
638 | ||
76f7164d AG |
639 | static void tls_hw_sk_destruct(struct sock *sk) |
640 | { | |
641 | struct tls_context *ctx = tls_get_ctx(sk); | |
642 | struct inet_connection_sock *icsk = inet_csk(sk); | |
643 | ||
644 | ctx->sk_destruct(sk); | |
645 | /* Free ctx */ | |
acd3e96d | 646 | tls_ctx_free(ctx); |
76f7164d AG |
647 | icsk->icsk_ulp_data = NULL; |
648 | } | |
649 | ||
dd0bed16 AG |
650 | static int tls_hw_prot(struct sock *sk) |
651 | { | |
652 | struct tls_context *ctx; | |
653 | struct tls_device *dev; | |
654 | int rc = 0; | |
655 | ||
df9d4a17 | 656 | spin_lock_bh(&device_spinlock); |
dd0bed16 AG |
657 | list_for_each_entry(dev, &device_list, dev_list) { |
658 | if (dev->feature && dev->feature(dev)) { | |
659 | ctx = create_ctx(sk); | |
660 | if (!ctx) | |
661 | goto out; | |
662 | ||
63a6b3fe AG |
663 | spin_unlock_bh(&device_spinlock); |
664 | tls_build_proto(sk); | |
dd0bed16 AG |
665 | ctx->hash = sk->sk_prot->hash; |
666 | ctx->unhash = sk->sk_prot->unhash; | |
667 | ctx->sk_proto_close = sk->sk_prot->close; | |
76f7164d AG |
668 | ctx->sk_destruct = sk->sk_destruct; |
669 | sk->sk_destruct = tls_hw_sk_destruct; | |
f66de3ee BP |
670 | ctx->rx_conf = TLS_HW_RECORD; |
671 | ctx->tx_conf = TLS_HW_RECORD; | |
dd0bed16 | 672 | update_sk_prot(sk, ctx); |
63a6b3fe | 673 | spin_lock_bh(&device_spinlock); |
dd0bed16 AG |
674 | rc = 1; |
675 | break; | |
676 | } | |
677 | } | |
678 | out: | |
df9d4a17 | 679 | spin_unlock_bh(&device_spinlock); |
dd0bed16 AG |
680 | return rc; |
681 | } | |
682 | ||
683 | static void tls_hw_unhash(struct sock *sk) | |
684 | { | |
685 | struct tls_context *ctx = tls_get_ctx(sk); | |
686 | struct tls_device *dev; | |
687 | ||
df9d4a17 | 688 | spin_lock_bh(&device_spinlock); |
dd0bed16 | 689 | list_for_each_entry(dev, &device_list, dev_list) { |
df9d4a17 AG |
690 | if (dev->unhash) { |
691 | kref_get(&dev->kref); | |
692 | spin_unlock_bh(&device_spinlock); | |
dd0bed16 | 693 | dev->unhash(dev, sk); |
df9d4a17 AG |
694 | kref_put(&dev->kref, dev->release); |
695 | spin_lock_bh(&device_spinlock); | |
696 | } | |
dd0bed16 | 697 | } |
df9d4a17 | 698 | spin_unlock_bh(&device_spinlock); |
dd0bed16 AG |
699 | ctx->unhash(sk); |
700 | } | |
701 | ||
702 | static int tls_hw_hash(struct sock *sk) | |
703 | { | |
704 | struct tls_context *ctx = tls_get_ctx(sk); | |
705 | struct tls_device *dev; | |
706 | int err; | |
707 | ||
708 | err = ctx->hash(sk); | |
df9d4a17 | 709 | spin_lock_bh(&device_spinlock); |
dd0bed16 | 710 | list_for_each_entry(dev, &device_list, dev_list) { |
df9d4a17 AG |
711 | if (dev->hash) { |
712 | kref_get(&dev->kref); | |
713 | spin_unlock_bh(&device_spinlock); | |
dd0bed16 | 714 | err |= dev->hash(dev, sk); |
df9d4a17 AG |
715 | kref_put(&dev->kref, dev->release); |
716 | spin_lock_bh(&device_spinlock); | |
717 | } | |
dd0bed16 | 718 | } |
df9d4a17 | 719 | spin_unlock_bh(&device_spinlock); |
dd0bed16 AG |
720 | |
721 | if (err) | |
722 | tls_hw_unhash(sk); | |
723 | return err; | |
724 | } | |
725 | ||
f66de3ee BP |
726 | static void build_protos(struct proto prot[TLS_NUM_CONFIG][TLS_NUM_CONFIG], |
727 | struct proto *base) | |
c113187d | 728 | { |
f66de3ee BP |
729 | prot[TLS_BASE][TLS_BASE] = *base; |
730 | prot[TLS_BASE][TLS_BASE].setsockopt = tls_setsockopt; | |
731 | prot[TLS_BASE][TLS_BASE].getsockopt = tls_getsockopt; | |
732 | prot[TLS_BASE][TLS_BASE].close = tls_sk_proto_close; | |
733 | ||
734 | prot[TLS_SW][TLS_BASE] = prot[TLS_BASE][TLS_BASE]; | |
735 | prot[TLS_SW][TLS_BASE].sendmsg = tls_sw_sendmsg; | |
736 | prot[TLS_SW][TLS_BASE].sendpage = tls_sw_sendpage; | |
737 | ||
738 | prot[TLS_BASE][TLS_SW] = prot[TLS_BASE][TLS_BASE]; | |
924ad65e JF |
739 | prot[TLS_BASE][TLS_SW].recvmsg = tls_sw_recvmsg; |
740 | prot[TLS_BASE][TLS_SW].stream_memory_read = tls_sw_stream_read; | |
741 | prot[TLS_BASE][TLS_SW].close = tls_sk_proto_close; | |
f66de3ee BP |
742 | |
743 | prot[TLS_SW][TLS_SW] = prot[TLS_SW][TLS_BASE]; | |
924ad65e JF |
744 | prot[TLS_SW][TLS_SW].recvmsg = tls_sw_recvmsg; |
745 | prot[TLS_SW][TLS_SW].stream_memory_read = tls_sw_stream_read; | |
746 | prot[TLS_SW][TLS_SW].close = tls_sk_proto_close; | |
f66de3ee | 747 | |
e8f69799 IL |
748 | #ifdef CONFIG_TLS_DEVICE |
749 | prot[TLS_HW][TLS_BASE] = prot[TLS_BASE][TLS_BASE]; | |
750 | prot[TLS_HW][TLS_BASE].sendmsg = tls_device_sendmsg; | |
751 | prot[TLS_HW][TLS_BASE].sendpage = tls_device_sendpage; | |
752 | ||
753 | prot[TLS_HW][TLS_SW] = prot[TLS_BASE][TLS_SW]; | |
754 | prot[TLS_HW][TLS_SW].sendmsg = tls_device_sendmsg; | |
755 | prot[TLS_HW][TLS_SW].sendpage = tls_device_sendpage; | |
4799ac81 BP |
756 | |
757 | prot[TLS_BASE][TLS_HW] = prot[TLS_BASE][TLS_SW]; | |
758 | ||
759 | prot[TLS_SW][TLS_HW] = prot[TLS_SW][TLS_SW]; | |
760 | ||
761 | prot[TLS_HW][TLS_HW] = prot[TLS_HW][TLS_SW]; | |
e8f69799 IL |
762 | #endif |
763 | ||
f66de3ee BP |
764 | prot[TLS_HW_RECORD][TLS_HW_RECORD] = *base; |
765 | prot[TLS_HW_RECORD][TLS_HW_RECORD].hash = tls_hw_hash; | |
766 | prot[TLS_HW_RECORD][TLS_HW_RECORD].unhash = tls_hw_unhash; | |
767 | prot[TLS_HW_RECORD][TLS_HW_RECORD].close = tls_sk_proto_close; | |
c113187d BP |
768 | } |
769 | ||
3c4d7559 DW |
770 | static int tls_init(struct sock *sk) |
771 | { | |
3c4d7559 DW |
772 | struct tls_context *ctx; |
773 | int rc = 0; | |
774 | ||
dd0bed16 AG |
775 | if (tls_hw_prot(sk)) |
776 | goto out; | |
777 | ||
d91c3e17 IL |
778 | /* The TLS ulp is currently supported only for TCP sockets |
779 | * in ESTABLISHED state. | |
780 | * Supporting sockets in LISTEN state will require us | |
781 | * to modify the accept implementation to clone rather then | |
782 | * share the ulp context. | |
783 | */ | |
784 | if (sk->sk_state != TCP_ESTABLISHED) | |
785 | return -ENOTSUPP; | |
786 | ||
3c4d7559 | 787 | /* allocate tls context */ |
dd0bed16 | 788 | ctx = create_ctx(sk); |
3c4d7559 DW |
789 | if (!ctx) { |
790 | rc = -ENOMEM; | |
791 | goto out; | |
792 | } | |
6d88207f | 793 | |
63a6b3fe | 794 | tls_build_proto(sk); |
f66de3ee BP |
795 | ctx->tx_conf = TLS_BASE; |
796 | ctx->rx_conf = TLS_BASE; | |
6d88207f | 797 | update_sk_prot(sk, ctx); |
3c4d7559 DW |
798 | out: |
799 | return rc; | |
800 | } | |
801 | ||
dd0bed16 AG |
802 | void tls_register_device(struct tls_device *device) |
803 | { | |
df9d4a17 | 804 | spin_lock_bh(&device_spinlock); |
dd0bed16 | 805 | list_add_tail(&device->dev_list, &device_list); |
df9d4a17 | 806 | spin_unlock_bh(&device_spinlock); |
dd0bed16 AG |
807 | } |
808 | EXPORT_SYMBOL(tls_register_device); | |
809 | ||
810 | void tls_unregister_device(struct tls_device *device) | |
811 | { | |
df9d4a17 | 812 | spin_lock_bh(&device_spinlock); |
dd0bed16 | 813 | list_del(&device->dev_list); |
df9d4a17 | 814 | spin_unlock_bh(&device_spinlock); |
dd0bed16 AG |
815 | } |
816 | EXPORT_SYMBOL(tls_unregister_device); | |
817 | ||
3c4d7559 DW |
818 | static struct tcp_ulp_ops tcp_tls_ulp_ops __read_mostly = { |
819 | .name = "tls", | |
820 | .owner = THIS_MODULE, | |
821 | .init = tls_init, | |
822 | }; | |
823 | ||
824 | static int __init tls_register(void) | |
825 | { | |
c46234eb | 826 | tls_sw_proto_ops = inet_stream_ops; |
c46234eb DW |
827 | tls_sw_proto_ops.splice_read = tls_sw_splice_read; |
828 | ||
e8f69799 IL |
829 | #ifdef CONFIG_TLS_DEVICE |
830 | tls_device_init(); | |
831 | #endif | |
3c4d7559 DW |
832 | tcp_register_ulp(&tcp_tls_ulp_ops); |
833 | ||
834 | return 0; | |
835 | } | |
836 | ||
837 | static void __exit tls_unregister(void) | |
838 | { | |
839 | tcp_unregister_ulp(&tcp_tls_ulp_ops); | |
e8f69799 IL |
840 | #ifdef CONFIG_TLS_DEVICE |
841 | tls_device_cleanup(); | |
842 | #endif | |
3c4d7559 DW |
843 | } |
844 | ||
845 | module_init(tls_register); | |
846 | module_exit(tls_unregister); |