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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 | ||
313ab004 JF |
264 | static void tls_sk_proto_cleanup(struct sock *sk, |
265 | struct tls_context *ctx, long timeo) | |
3c4d7559 | 266 | { |
9354544c DM |
267 | if (unlikely(sk->sk_write_pending) && |
268 | !wait_on_pending_writer(sk, &timeo)) | |
3c4d7559 DW |
269 | tls_handle_open_record(sk, 0); |
270 | ||
f66de3ee BP |
271 | /* We need these for tls_sw_fallback handling of other packets */ |
272 | if (ctx->tx_conf == TLS_SW) { | |
273 | kfree(ctx->tx.rec_seq); | |
274 | kfree(ctx->tx.iv); | |
313ab004 | 275 | tls_sw_release_resources_tx(sk); |
903f1a18 | 276 | #ifdef CONFIG_TLS_DEVICE |
35b71a34 JK |
277 | } else if (ctx->tx_conf == TLS_HW) { |
278 | tls_device_free_resources_tx(sk); | |
903f1a18 | 279 | #endif |
f66de3ee | 280 | } |
3c4d7559 | 281 | |
12c76861 | 282 | if (ctx->rx_conf == TLS_SW) |
313ab004 | 283 | tls_sw_release_resources_rx(sk); |
3c4d7559 | 284 | |
e8f69799 | 285 | #ifdef CONFIG_TLS_DEVICE |
4799ac81 BP |
286 | if (ctx->rx_conf == TLS_HW) |
287 | tls_device_offload_cleanup_rx(sk); | |
e8f69799 | 288 | #endif |
313ab004 JF |
289 | } |
290 | ||
291 | static void tls_sk_proto_close(struct sock *sk, long timeout) | |
292 | { | |
95fa1454 | 293 | struct inet_connection_sock *icsk = inet_csk(sk); |
313ab004 JF |
294 | struct tls_context *ctx = tls_get_ctx(sk); |
295 | long timeo = sock_sndtimeo(sk, 0); | |
296 | bool free_ctx; | |
297 | ||
298 | if (ctx->tx_conf == TLS_SW) | |
299 | tls_sw_cancel_work_tx(ctx); | |
300 | ||
301 | lock_sock(sk); | |
302 | free_ctx = ctx->tx_conf != TLS_HW && ctx->rx_conf != TLS_HW; | |
313ab004 JF |
303 | |
304 | if (ctx->tx_conf != TLS_BASE || ctx->rx_conf != TLS_BASE) | |
305 | tls_sk_proto_cleanup(sk, ctx, timeo); | |
e8f69799 | 306 | |
95fa1454 JF |
307 | write_lock_bh(&sk->sk_callback_lock); |
308 | if (free_ctx) | |
309 | icsk->icsk_ulp_data = NULL; | |
32857cf5 | 310 | sk->sk_prot = ctx->sk_proto; |
57c722e9 | 311 | sk->sk_write_space = ctx->sk_write_space; |
95fa1454 | 312 | write_unlock_bh(&sk->sk_callback_lock); |
3c4d7559 | 313 | release_sock(sk); |
313ab004 JF |
314 | if (ctx->tx_conf == TLS_SW) |
315 | tls_sw_free_ctx_tx(ctx); | |
316 | if (ctx->rx_conf == TLS_SW || ctx->rx_conf == TLS_HW) | |
317 | tls_sw_strparser_done(ctx); | |
318 | if (ctx->rx_conf == TLS_SW) | |
319 | tls_sw_free_ctx_rx(ctx); | |
95fa1454 | 320 | ctx->sk_proto_close(sk, timeout); |
313ab004 | 321 | |
98f0a395 | 322 | if (free_ctx) |
86029d10 | 323 | tls_ctx_free(ctx); |
3c4d7559 DW |
324 | } |
325 | ||
326 | static int do_tls_getsockopt_tx(struct sock *sk, char __user *optval, | |
327 | int __user *optlen) | |
328 | { | |
329 | int rc = 0; | |
330 | struct tls_context *ctx = tls_get_ctx(sk); | |
331 | struct tls_crypto_info *crypto_info; | |
332 | int len; | |
333 | ||
334 | if (get_user(len, optlen)) | |
335 | return -EFAULT; | |
336 | ||
337 | if (!optval || (len < sizeof(*crypto_info))) { | |
338 | rc = -EINVAL; | |
339 | goto out; | |
340 | } | |
341 | ||
342 | if (!ctx) { | |
343 | rc = -EBUSY; | |
344 | goto out; | |
345 | } | |
346 | ||
347 | /* get user crypto info */ | |
86029d10 | 348 | crypto_info = &ctx->crypto_send.info; |
3c4d7559 DW |
349 | |
350 | if (!TLS_CRYPTO_INFO_READY(crypto_info)) { | |
351 | rc = -EBUSY; | |
352 | goto out; | |
353 | } | |
354 | ||
5a3b886c | 355 | if (len == sizeof(*crypto_info)) { |
ac55cd61 DC |
356 | if (copy_to_user(optval, crypto_info, sizeof(*crypto_info))) |
357 | rc = -EFAULT; | |
3c4d7559 DW |
358 | goto out; |
359 | } | |
360 | ||
361 | switch (crypto_info->cipher_type) { | |
362 | case TLS_CIPHER_AES_GCM_128: { | |
363 | struct tls12_crypto_info_aes_gcm_128 * | |
364 | crypto_info_aes_gcm_128 = | |
365 | container_of(crypto_info, | |
366 | struct tls12_crypto_info_aes_gcm_128, | |
367 | info); | |
368 | ||
369 | if (len != sizeof(*crypto_info_aes_gcm_128)) { | |
370 | rc = -EINVAL; | |
371 | goto out; | |
372 | } | |
373 | lock_sock(sk); | |
a1dfa681 | 374 | memcpy(crypto_info_aes_gcm_128->iv, |
dbe42559 | 375 | ctx->tx.iv + TLS_CIPHER_AES_GCM_128_SALT_SIZE, |
3c4d7559 | 376 | TLS_CIPHER_AES_GCM_128_IV_SIZE); |
dbe42559 | 377 | memcpy(crypto_info_aes_gcm_128->rec_seq, ctx->tx.rec_seq, |
c410c196 | 378 | TLS_CIPHER_AES_GCM_128_REC_SEQ_SIZE); |
3c4d7559 | 379 | release_sock(sk); |
ac55cd61 DC |
380 | if (copy_to_user(optval, |
381 | crypto_info_aes_gcm_128, | |
382 | sizeof(*crypto_info_aes_gcm_128))) | |
383 | rc = -EFAULT; | |
3c4d7559 DW |
384 | break; |
385 | } | |
fb99bce7 DW |
386 | case TLS_CIPHER_AES_GCM_256: { |
387 | struct tls12_crypto_info_aes_gcm_256 * | |
388 | crypto_info_aes_gcm_256 = | |
389 | container_of(crypto_info, | |
390 | struct tls12_crypto_info_aes_gcm_256, | |
391 | info); | |
392 | ||
393 | if (len != sizeof(*crypto_info_aes_gcm_256)) { | |
394 | rc = -EINVAL; | |
395 | goto out; | |
396 | } | |
397 | lock_sock(sk); | |
398 | memcpy(crypto_info_aes_gcm_256->iv, | |
399 | ctx->tx.iv + TLS_CIPHER_AES_GCM_256_SALT_SIZE, | |
400 | TLS_CIPHER_AES_GCM_256_IV_SIZE); | |
401 | memcpy(crypto_info_aes_gcm_256->rec_seq, ctx->tx.rec_seq, | |
402 | TLS_CIPHER_AES_GCM_256_REC_SEQ_SIZE); | |
403 | release_sock(sk); | |
404 | if (copy_to_user(optval, | |
405 | crypto_info_aes_gcm_256, | |
406 | sizeof(*crypto_info_aes_gcm_256))) | |
407 | rc = -EFAULT; | |
408 | break; | |
409 | } | |
3c4d7559 DW |
410 | default: |
411 | rc = -EINVAL; | |
412 | } | |
413 | ||
414 | out: | |
415 | return rc; | |
416 | } | |
417 | ||
418 | static int do_tls_getsockopt(struct sock *sk, int optname, | |
419 | char __user *optval, int __user *optlen) | |
420 | { | |
421 | int rc = 0; | |
422 | ||
423 | switch (optname) { | |
424 | case TLS_TX: | |
425 | rc = do_tls_getsockopt_tx(sk, optval, optlen); | |
426 | break; | |
427 | default: | |
428 | rc = -ENOPROTOOPT; | |
429 | break; | |
430 | } | |
431 | return rc; | |
432 | } | |
433 | ||
434 | static int tls_getsockopt(struct sock *sk, int level, int optname, | |
435 | char __user *optval, int __user *optlen) | |
436 | { | |
437 | struct tls_context *ctx = tls_get_ctx(sk); | |
438 | ||
439 | if (level != SOL_TLS) | |
440 | return ctx->getsockopt(sk, level, optname, optval, optlen); | |
441 | ||
442 | return do_tls_getsockopt(sk, optname, optval, optlen); | |
443 | } | |
444 | ||
c46234eb DW |
445 | static int do_tls_setsockopt_conf(struct sock *sk, char __user *optval, |
446 | unsigned int optlen, int tx) | |
3c4d7559 | 447 | { |
196c31b4 | 448 | struct tls_crypto_info *crypto_info; |
4509de14 | 449 | struct tls_crypto_info *alt_crypto_info; |
3c4d7559 | 450 | struct tls_context *ctx = tls_get_ctx(sk); |
fb99bce7 | 451 | size_t optsize; |
3c4d7559 | 452 | int rc = 0; |
58371585 | 453 | int conf; |
3c4d7559 DW |
454 | |
455 | if (!optval || (optlen < sizeof(*crypto_info))) { | |
456 | rc = -EINVAL; | |
457 | goto out; | |
458 | } | |
459 | ||
4509de14 | 460 | if (tx) { |
86029d10 | 461 | crypto_info = &ctx->crypto_send.info; |
4509de14 VG |
462 | alt_crypto_info = &ctx->crypto_recv.info; |
463 | } else { | |
86029d10 | 464 | crypto_info = &ctx->crypto_recv.info; |
4509de14 VG |
465 | alt_crypto_info = &ctx->crypto_send.info; |
466 | } | |
c46234eb | 467 | |
196c31b4 | 468 | /* Currently we don't support set crypto info more than one time */ |
877d17c7 SD |
469 | if (TLS_CRYPTO_INFO_READY(crypto_info)) { |
470 | rc = -EBUSY; | |
196c31b4 | 471 | goto out; |
877d17c7 | 472 | } |
196c31b4 IL |
473 | |
474 | rc = copy_from_user(crypto_info, optval, sizeof(*crypto_info)); | |
3c4d7559 DW |
475 | if (rc) { |
476 | rc = -EFAULT; | |
257082e6 | 477 | goto err_crypto_info; |
3c4d7559 DW |
478 | } |
479 | ||
480 | /* check version */ | |
130b392c DW |
481 | if (crypto_info->version != TLS_1_2_VERSION && |
482 | crypto_info->version != TLS_1_3_VERSION) { | |
3c4d7559 | 483 | rc = -ENOTSUPP; |
196c31b4 | 484 | goto err_crypto_info; |
3c4d7559 DW |
485 | } |
486 | ||
4509de14 VG |
487 | /* Ensure that TLS version and ciphers are same in both directions */ |
488 | if (TLS_CRYPTO_INFO_READY(alt_crypto_info)) { | |
489 | if (alt_crypto_info->version != crypto_info->version || | |
490 | alt_crypto_info->cipher_type != crypto_info->cipher_type) { | |
491 | rc = -EINVAL; | |
492 | goto err_crypto_info; | |
493 | } | |
494 | } | |
495 | ||
196c31b4 | 496 | switch (crypto_info->cipher_type) { |
fb99bce7 | 497 | case TLS_CIPHER_AES_GCM_128: |
f295b3ae VG |
498 | optsize = sizeof(struct tls12_crypto_info_aes_gcm_128); |
499 | break; | |
fb99bce7 | 500 | case TLS_CIPHER_AES_GCM_256: { |
f295b3ae | 501 | optsize = sizeof(struct tls12_crypto_info_aes_gcm_256); |
3c4d7559 DW |
502 | break; |
503 | } | |
f295b3ae VG |
504 | case TLS_CIPHER_AES_CCM_128: |
505 | optsize = sizeof(struct tls12_crypto_info_aes_ccm_128); | |
506 | break; | |
3c4d7559 DW |
507 | default: |
508 | rc = -EINVAL; | |
6db959c8 | 509 | goto err_crypto_info; |
3c4d7559 DW |
510 | } |
511 | ||
f295b3ae VG |
512 | if (optlen != optsize) { |
513 | rc = -EINVAL; | |
514 | goto err_crypto_info; | |
515 | } | |
516 | ||
517 | rc = copy_from_user(crypto_info + 1, optval + sizeof(*crypto_info), | |
518 | optlen - sizeof(*crypto_info)); | |
519 | if (rc) { | |
520 | rc = -EFAULT; | |
521 | goto err_crypto_info; | |
522 | } | |
523 | ||
c46234eb | 524 | if (tx) { |
e8f69799 IL |
525 | #ifdef CONFIG_TLS_DEVICE |
526 | rc = tls_set_device_offload(sk, ctx); | |
527 | conf = TLS_HW; | |
528 | if (rc) { | |
529 | #else | |
530 | { | |
531 | #endif | |
532 | rc = tls_set_sw_offload(sk, ctx, 1); | |
318892ac JK |
533 | if (rc) |
534 | goto err_crypto_info; | |
e8f69799 IL |
535 | conf = TLS_SW; |
536 | } | |
c46234eb | 537 | } else { |
4799ac81 BP |
538 | #ifdef CONFIG_TLS_DEVICE |
539 | rc = tls_set_device_offload_rx(sk, ctx); | |
540 | conf = TLS_HW; | |
541 | if (rc) { | |
542 | #else | |
543 | { | |
544 | #endif | |
545 | rc = tls_set_sw_offload(sk, ctx, 0); | |
318892ac JK |
546 | if (rc) |
547 | goto err_crypto_info; | |
4799ac81 BP |
548 | conf = TLS_SW; |
549 | } | |
313ab004 | 550 | tls_sw_strparser_arm(sk, ctx); |
c46234eb DW |
551 | } |
552 | ||
f66de3ee BP |
553 | if (tx) |
554 | ctx->tx_conf = conf; | |
555 | else | |
556 | ctx->rx_conf = conf; | |
6d88207f | 557 | update_sk_prot(sk, ctx); |
c46234eb DW |
558 | if (tx) { |
559 | ctx->sk_write_space = sk->sk_write_space; | |
560 | sk->sk_write_space = tls_write_space; | |
561 | } else { | |
562 | sk->sk_socket->ops = &tls_sw_proto_ops; | |
563 | } | |
3c4d7559 DW |
564 | goto out; |
565 | ||
566 | err_crypto_info: | |
c844eb46 | 567 | memzero_explicit(crypto_info, sizeof(union tls_crypto_context)); |
3c4d7559 DW |
568 | out: |
569 | return rc; | |
570 | } | |
571 | ||
572 | static int do_tls_setsockopt(struct sock *sk, int optname, | |
573 | char __user *optval, unsigned int optlen) | |
574 | { | |
575 | int rc = 0; | |
576 | ||
577 | switch (optname) { | |
578 | case TLS_TX: | |
c46234eb | 579 | case TLS_RX: |
3c4d7559 | 580 | lock_sock(sk); |
c46234eb DW |
581 | rc = do_tls_setsockopt_conf(sk, optval, optlen, |
582 | optname == TLS_TX); | |
3c4d7559 DW |
583 | release_sock(sk); |
584 | break; | |
585 | default: | |
586 | rc = -ENOPROTOOPT; | |
587 | break; | |
588 | } | |
589 | return rc; | |
590 | } | |
591 | ||
592 | static int tls_setsockopt(struct sock *sk, int level, int optname, | |
593 | char __user *optval, unsigned int optlen) | |
594 | { | |
595 | struct tls_context *ctx = tls_get_ctx(sk); | |
596 | ||
597 | if (level != SOL_TLS) | |
598 | return ctx->setsockopt(sk, level, optname, optval, optlen); | |
599 | ||
600 | return do_tls_setsockopt(sk, optname, optval, optlen); | |
601 | } | |
602 | ||
dd0bed16 AG |
603 | static struct tls_context *create_ctx(struct sock *sk) |
604 | { | |
605 | struct inet_connection_sock *icsk = inet_csk(sk); | |
606 | struct tls_context *ctx; | |
607 | ||
c6ec179a | 608 | ctx = kzalloc(sizeof(*ctx), GFP_ATOMIC); |
dd0bed16 AG |
609 | if (!ctx) |
610 | return NULL; | |
611 | ||
612 | icsk->icsk_ulp_data = ctx; | |
6c0563e4 AG |
613 | ctx->setsockopt = sk->sk_prot->setsockopt; |
614 | ctx->getsockopt = sk->sk_prot->getsockopt; | |
615 | ctx->sk_proto_close = sk->sk_prot->close; | |
32857cf5 | 616 | ctx->unhash = sk->sk_prot->unhash; |
dd0bed16 AG |
617 | return ctx; |
618 | } | |
619 | ||
63a6b3fe AG |
620 | static void tls_build_proto(struct sock *sk) |
621 | { | |
622 | int ip_ver = sk->sk_family == AF_INET6 ? TLSV6 : TLSV4; | |
623 | ||
624 | /* Build IPv6 TLS whenever the address of tcpv6 _prot changes */ | |
625 | if (ip_ver == TLSV6 && | |
626 | unlikely(sk->sk_prot != smp_load_acquire(&saved_tcpv6_prot))) { | |
627 | mutex_lock(&tcpv6_prot_mutex); | |
628 | if (likely(sk->sk_prot != saved_tcpv6_prot)) { | |
629 | build_protos(tls_prots[TLSV6], sk->sk_prot); | |
630 | smp_store_release(&saved_tcpv6_prot, sk->sk_prot); | |
631 | } | |
632 | mutex_unlock(&tcpv6_prot_mutex); | |
633 | } | |
634 | ||
635 | if (ip_ver == TLSV4 && | |
636 | unlikely(sk->sk_prot != smp_load_acquire(&saved_tcpv4_prot))) { | |
637 | mutex_lock(&tcpv4_prot_mutex); | |
638 | if (likely(sk->sk_prot != saved_tcpv4_prot)) { | |
639 | build_protos(tls_prots[TLSV4], sk->sk_prot); | |
640 | smp_store_release(&saved_tcpv4_prot, sk->sk_prot); | |
641 | } | |
642 | mutex_unlock(&tcpv4_prot_mutex); | |
643 | } | |
644 | } | |
645 | ||
76f7164d AG |
646 | static void tls_hw_sk_destruct(struct sock *sk) |
647 | { | |
648 | struct tls_context *ctx = tls_get_ctx(sk); | |
649 | struct inet_connection_sock *icsk = inet_csk(sk); | |
650 | ||
651 | ctx->sk_destruct(sk); | |
652 | /* Free ctx */ | |
acd3e96d | 653 | tls_ctx_free(ctx); |
76f7164d AG |
654 | icsk->icsk_ulp_data = NULL; |
655 | } | |
656 | ||
dd0bed16 AG |
657 | static int tls_hw_prot(struct sock *sk) |
658 | { | |
659 | struct tls_context *ctx; | |
660 | struct tls_device *dev; | |
661 | int rc = 0; | |
662 | ||
df9d4a17 | 663 | spin_lock_bh(&device_spinlock); |
dd0bed16 AG |
664 | list_for_each_entry(dev, &device_list, dev_list) { |
665 | if (dev->feature && dev->feature(dev)) { | |
666 | ctx = create_ctx(sk); | |
667 | if (!ctx) | |
668 | goto out; | |
669 | ||
63a6b3fe AG |
670 | spin_unlock_bh(&device_spinlock); |
671 | tls_build_proto(sk); | |
dd0bed16 AG |
672 | ctx->hash = sk->sk_prot->hash; |
673 | ctx->unhash = sk->sk_prot->unhash; | |
674 | ctx->sk_proto_close = sk->sk_prot->close; | |
76f7164d AG |
675 | ctx->sk_destruct = sk->sk_destruct; |
676 | sk->sk_destruct = tls_hw_sk_destruct; | |
f66de3ee BP |
677 | ctx->rx_conf = TLS_HW_RECORD; |
678 | ctx->tx_conf = TLS_HW_RECORD; | |
dd0bed16 | 679 | update_sk_prot(sk, ctx); |
63a6b3fe | 680 | spin_lock_bh(&device_spinlock); |
dd0bed16 AG |
681 | rc = 1; |
682 | break; | |
683 | } | |
684 | } | |
685 | out: | |
df9d4a17 | 686 | spin_unlock_bh(&device_spinlock); |
dd0bed16 AG |
687 | return rc; |
688 | } | |
689 | ||
690 | static void tls_hw_unhash(struct sock *sk) | |
691 | { | |
692 | struct tls_context *ctx = tls_get_ctx(sk); | |
693 | struct tls_device *dev; | |
694 | ||
df9d4a17 | 695 | spin_lock_bh(&device_spinlock); |
dd0bed16 | 696 | list_for_each_entry(dev, &device_list, dev_list) { |
df9d4a17 AG |
697 | if (dev->unhash) { |
698 | kref_get(&dev->kref); | |
699 | spin_unlock_bh(&device_spinlock); | |
dd0bed16 | 700 | dev->unhash(dev, sk); |
df9d4a17 AG |
701 | kref_put(&dev->kref, dev->release); |
702 | spin_lock_bh(&device_spinlock); | |
703 | } | |
dd0bed16 | 704 | } |
df9d4a17 | 705 | spin_unlock_bh(&device_spinlock); |
dd0bed16 AG |
706 | ctx->unhash(sk); |
707 | } | |
708 | ||
709 | static int tls_hw_hash(struct sock *sk) | |
710 | { | |
711 | struct tls_context *ctx = tls_get_ctx(sk); | |
712 | struct tls_device *dev; | |
713 | int err; | |
714 | ||
715 | err = ctx->hash(sk); | |
df9d4a17 | 716 | spin_lock_bh(&device_spinlock); |
dd0bed16 | 717 | list_for_each_entry(dev, &device_list, dev_list) { |
df9d4a17 AG |
718 | if (dev->hash) { |
719 | kref_get(&dev->kref); | |
720 | spin_unlock_bh(&device_spinlock); | |
dd0bed16 | 721 | err |= dev->hash(dev, sk); |
df9d4a17 AG |
722 | kref_put(&dev->kref, dev->release); |
723 | spin_lock_bh(&device_spinlock); | |
724 | } | |
dd0bed16 | 725 | } |
df9d4a17 | 726 | spin_unlock_bh(&device_spinlock); |
dd0bed16 AG |
727 | |
728 | if (err) | |
729 | tls_hw_unhash(sk); | |
730 | return err; | |
731 | } | |
732 | ||
f66de3ee BP |
733 | static void build_protos(struct proto prot[TLS_NUM_CONFIG][TLS_NUM_CONFIG], |
734 | struct proto *base) | |
c113187d | 735 | { |
f66de3ee BP |
736 | prot[TLS_BASE][TLS_BASE] = *base; |
737 | prot[TLS_BASE][TLS_BASE].setsockopt = tls_setsockopt; | |
738 | prot[TLS_BASE][TLS_BASE].getsockopt = tls_getsockopt; | |
739 | prot[TLS_BASE][TLS_BASE].close = tls_sk_proto_close; | |
740 | ||
741 | prot[TLS_SW][TLS_BASE] = prot[TLS_BASE][TLS_BASE]; | |
742 | prot[TLS_SW][TLS_BASE].sendmsg = tls_sw_sendmsg; | |
743 | prot[TLS_SW][TLS_BASE].sendpage = tls_sw_sendpage; | |
744 | ||
745 | prot[TLS_BASE][TLS_SW] = prot[TLS_BASE][TLS_BASE]; | |
924ad65e JF |
746 | prot[TLS_BASE][TLS_SW].recvmsg = tls_sw_recvmsg; |
747 | prot[TLS_BASE][TLS_SW].stream_memory_read = tls_sw_stream_read; | |
748 | prot[TLS_BASE][TLS_SW].close = tls_sk_proto_close; | |
f66de3ee BP |
749 | |
750 | prot[TLS_SW][TLS_SW] = prot[TLS_SW][TLS_BASE]; | |
924ad65e JF |
751 | prot[TLS_SW][TLS_SW].recvmsg = tls_sw_recvmsg; |
752 | prot[TLS_SW][TLS_SW].stream_memory_read = tls_sw_stream_read; | |
753 | prot[TLS_SW][TLS_SW].close = tls_sk_proto_close; | |
f66de3ee | 754 | |
e8f69799 IL |
755 | #ifdef CONFIG_TLS_DEVICE |
756 | prot[TLS_HW][TLS_BASE] = prot[TLS_BASE][TLS_BASE]; | |
757 | prot[TLS_HW][TLS_BASE].sendmsg = tls_device_sendmsg; | |
758 | prot[TLS_HW][TLS_BASE].sendpage = tls_device_sendpage; | |
759 | ||
760 | prot[TLS_HW][TLS_SW] = prot[TLS_BASE][TLS_SW]; | |
761 | prot[TLS_HW][TLS_SW].sendmsg = tls_device_sendmsg; | |
762 | prot[TLS_HW][TLS_SW].sendpage = tls_device_sendpage; | |
4799ac81 BP |
763 | |
764 | prot[TLS_BASE][TLS_HW] = prot[TLS_BASE][TLS_SW]; | |
765 | ||
766 | prot[TLS_SW][TLS_HW] = prot[TLS_SW][TLS_SW]; | |
767 | ||
768 | prot[TLS_HW][TLS_HW] = prot[TLS_HW][TLS_SW]; | |
e8f69799 IL |
769 | #endif |
770 | ||
f66de3ee BP |
771 | prot[TLS_HW_RECORD][TLS_HW_RECORD] = *base; |
772 | prot[TLS_HW_RECORD][TLS_HW_RECORD].hash = tls_hw_hash; | |
773 | prot[TLS_HW_RECORD][TLS_HW_RECORD].unhash = tls_hw_unhash; | |
c113187d BP |
774 | } |
775 | ||
3c4d7559 DW |
776 | static int tls_init(struct sock *sk) |
777 | { | |
3c4d7559 DW |
778 | struct tls_context *ctx; |
779 | int rc = 0; | |
780 | ||
dd0bed16 | 781 | if (tls_hw_prot(sk)) |
95fa1454 | 782 | return 0; |
dd0bed16 | 783 | |
d91c3e17 IL |
784 | /* The TLS ulp is currently supported only for TCP sockets |
785 | * in ESTABLISHED state. | |
786 | * Supporting sockets in LISTEN state will require us | |
787 | * to modify the accept implementation to clone rather then | |
788 | * share the ulp context. | |
789 | */ | |
790 | if (sk->sk_state != TCP_ESTABLISHED) | |
791 | return -ENOTSUPP; | |
792 | ||
95fa1454 JF |
793 | tls_build_proto(sk); |
794 | ||
3c4d7559 | 795 | /* allocate tls context */ |
95fa1454 | 796 | write_lock_bh(&sk->sk_callback_lock); |
dd0bed16 | 797 | ctx = create_ctx(sk); |
3c4d7559 DW |
798 | if (!ctx) { |
799 | rc = -ENOMEM; | |
800 | goto out; | |
801 | } | |
6d88207f | 802 | |
f66de3ee BP |
803 | ctx->tx_conf = TLS_BASE; |
804 | ctx->rx_conf = TLS_BASE; | |
32857cf5 | 805 | ctx->sk_proto = sk->sk_prot; |
6d88207f | 806 | update_sk_prot(sk, ctx); |
3c4d7559 | 807 | out: |
95fa1454 | 808 | write_unlock_bh(&sk->sk_callback_lock); |
3c4d7559 DW |
809 | return rc; |
810 | } | |
811 | ||
95fa1454 JF |
812 | static void tls_update(struct sock *sk, struct proto *p) |
813 | { | |
814 | struct tls_context *ctx; | |
815 | ||
816 | ctx = tls_get_ctx(sk); | |
817 | if (likely(ctx)) { | |
818 | ctx->sk_proto_close = p->close; | |
819 | ctx->sk_proto = p; | |
820 | } else { | |
821 | sk->sk_prot = p; | |
822 | } | |
823 | } | |
824 | ||
dd0bed16 AG |
825 | void tls_register_device(struct tls_device *device) |
826 | { | |
df9d4a17 | 827 | spin_lock_bh(&device_spinlock); |
dd0bed16 | 828 | list_add_tail(&device->dev_list, &device_list); |
df9d4a17 | 829 | spin_unlock_bh(&device_spinlock); |
dd0bed16 AG |
830 | } |
831 | EXPORT_SYMBOL(tls_register_device); | |
832 | ||
833 | void tls_unregister_device(struct tls_device *device) | |
834 | { | |
df9d4a17 | 835 | spin_lock_bh(&device_spinlock); |
dd0bed16 | 836 | list_del(&device->dev_list); |
df9d4a17 | 837 | spin_unlock_bh(&device_spinlock); |
dd0bed16 AG |
838 | } |
839 | EXPORT_SYMBOL(tls_unregister_device); | |
840 | ||
3c4d7559 DW |
841 | static struct tcp_ulp_ops tcp_tls_ulp_ops __read_mostly = { |
842 | .name = "tls", | |
843 | .owner = THIS_MODULE, | |
844 | .init = tls_init, | |
95fa1454 | 845 | .update = tls_update, |
3c4d7559 DW |
846 | }; |
847 | ||
848 | static int __init tls_register(void) | |
849 | { | |
c46234eb | 850 | tls_sw_proto_ops = inet_stream_ops; |
c46234eb DW |
851 | tls_sw_proto_ops.splice_read = tls_sw_splice_read; |
852 | ||
e8f69799 IL |
853 | #ifdef CONFIG_TLS_DEVICE |
854 | tls_device_init(); | |
855 | #endif | |
3c4d7559 DW |
856 | tcp_register_ulp(&tcp_tls_ulp_ops); |
857 | ||
858 | return 0; | |
859 | } | |
860 | ||
861 | static void __exit tls_unregister(void) | |
862 | { | |
863 | tcp_unregister_ulp(&tcp_tls_ulp_ops); | |
e8f69799 IL |
864 | #ifdef CONFIG_TLS_DEVICE |
865 | tls_device_cleanup(); | |
866 | #endif | |
3c4d7559 DW |
867 | } |
868 | ||
869 | module_init(tls_register); | |
870 | module_exit(tls_unregister); |