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