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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> | |
41 | #include <linux/inetdevice.h> | |
42 | #include <linux/inet_diag.h> | |
43 | ||
44 | #include <net/snmp.h> | |
45 | #include <net/tls.h> | |
46 | #include <net/tls_toe.h> | |
47 | ||
48 | MODULE_AUTHOR("Mellanox Technologies"); | |
49 | MODULE_DESCRIPTION("Transport Layer Security Support"); | |
50 | MODULE_LICENSE("Dual BSD/GPL"); | |
51 | MODULE_ALIAS_TCP_ULP("tls"); | |
52 | ||
53 | enum { | |
54 | TLSV4, | |
55 | TLSV6, | |
56 | TLS_NUM_PROTS, | |
57 | }; | |
58 | ||
59 | static struct proto *saved_tcpv6_prot; | |
60 | static DEFINE_MUTEX(tcpv6_prot_mutex); | |
61 | static struct proto *saved_tcpv4_prot; | |
62 | static DEFINE_MUTEX(tcpv4_prot_mutex); | |
63 | static struct proto tls_prots[TLS_NUM_PROTS][TLS_NUM_CONFIG][TLS_NUM_CONFIG]; | |
64 | static struct proto_ops tls_sw_proto_ops; | |
65 | static void build_protos(struct proto prot[TLS_NUM_CONFIG][TLS_NUM_CONFIG], | |
66 | struct proto *base); | |
67 | ||
68 | void update_sk_prot(struct sock *sk, struct tls_context *ctx) | |
69 | { | |
70 | int ip_ver = sk->sk_family == AF_INET6 ? TLSV6 : TLSV4; | |
71 | ||
72 | sk->sk_prot = &tls_prots[ip_ver][ctx->tx_conf][ctx->rx_conf]; | |
73 | } | |
74 | ||
75 | int wait_on_pending_writer(struct sock *sk, long *timeo) | |
76 | { | |
77 | int rc = 0; | |
78 | DEFINE_WAIT_FUNC(wait, woken_wake_function); | |
79 | ||
80 | add_wait_queue(sk_sleep(sk), &wait); | |
81 | while (1) { | |
82 | if (!*timeo) { | |
83 | rc = -EAGAIN; | |
84 | break; | |
85 | } | |
86 | ||
87 | if (signal_pending(current)) { | |
88 | rc = sock_intr_errno(*timeo); | |
89 | break; | |
90 | } | |
91 | ||
92 | if (sk_wait_event(sk, timeo, !sk->sk_write_pending, &wait)) | |
93 | break; | |
94 | } | |
95 | remove_wait_queue(sk_sleep(sk), &wait); | |
96 | return rc; | |
97 | } | |
98 | ||
99 | int tls_push_sg(struct sock *sk, | |
100 | struct tls_context *ctx, | |
101 | struct scatterlist *sg, | |
102 | u16 first_offset, | |
103 | int flags) | |
104 | { | |
105 | int sendpage_flags = flags | MSG_SENDPAGE_NOTLAST; | |
106 | int ret = 0; | |
107 | struct page *p; | |
108 | size_t size; | |
109 | int offset = first_offset; | |
110 | ||
111 | size = sg->length - offset; | |
112 | offset += sg->offset; | |
113 | ||
114 | ctx->in_tcp_sendpages = true; | |
115 | while (1) { | |
116 | if (sg_is_last(sg)) | |
117 | sendpage_flags = flags; | |
118 | ||
119 | /* is sending application-limited? */ | |
120 | tcp_rate_check_app_limited(sk); | |
121 | p = sg_page(sg); | |
122 | retry: | |
123 | ret = do_tcp_sendpages(sk, p, offset, size, sendpage_flags); | |
124 | ||
125 | if (ret != size) { | |
126 | if (ret > 0) { | |
127 | offset += ret; | |
128 | size -= ret; | |
129 | goto retry; | |
130 | } | |
131 | ||
132 | offset -= sg->offset; | |
133 | ctx->partially_sent_offset = offset; | |
134 | ctx->partially_sent_record = (void *)sg; | |
135 | ctx->in_tcp_sendpages = false; | |
136 | return ret; | |
137 | } | |
138 | ||
139 | put_page(p); | |
140 | sk_mem_uncharge(sk, sg->length); | |
141 | sg = sg_next(sg); | |
142 | if (!sg) | |
143 | break; | |
144 | ||
145 | offset = sg->offset; | |
146 | size = sg->length; | |
147 | } | |
148 | ||
149 | ctx->in_tcp_sendpages = false; | |
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 | ||
199 | int tls_push_partial_record(struct sock *sk, struct tls_context *ctx, | |
200 | int flags) | |
201 | { | |
202 | struct scatterlist *sg; | |
203 | u16 offset; | |
204 | ||
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 | bool tls_free_partial_record(struct sock *sk, struct tls_context *ctx) | |
213 | { | |
214 | struct scatterlist *sg; | |
215 | ||
216 | sg = ctx->partially_sent_record; | |
217 | if (!sg) | |
218 | return false; | |
219 | ||
220 | while (1) { | |
221 | put_page(sg_page(sg)); | |
222 | sk_mem_uncharge(sk, sg->length); | |
223 | ||
224 | if (sg_is_last(sg)) | |
225 | break; | |
226 | sg++; | |
227 | } | |
228 | ctx->partially_sent_record = NULL; | |
229 | return true; | |
230 | } | |
231 | ||
232 | static void tls_write_space(struct sock *sk) | |
233 | { | |
234 | struct tls_context *ctx = tls_get_ctx(sk); | |
235 | ||
236 | /* If in_tcp_sendpages call lower protocol write space handler | |
237 | * to ensure we wake up any waiting operations there. For example | |
238 | * if do_tcp_sendpages where to call sk_wait_event. | |
239 | */ | |
240 | if (ctx->in_tcp_sendpages) { | |
241 | ctx->sk_write_space(sk); | |
242 | return; | |
243 | } | |
244 | ||
245 | #ifdef CONFIG_TLS_DEVICE | |
246 | if (ctx->tx_conf == TLS_HW) | |
247 | tls_device_write_space(sk, ctx); | |
248 | else | |
249 | #endif | |
250 | tls_sw_write_space(sk, ctx); | |
251 | ||
252 | ctx->sk_write_space(sk); | |
253 | } | |
254 | ||
255 | /** | |
256 | * tls_ctx_free() - free TLS ULP context | |
257 | * @sk: socket to with @ctx is attached | |
258 | * @ctx: TLS context structure | |
259 | * | |
260 | * Free TLS context. If @sk is %NULL caller guarantees that the socket | |
261 | * to which @ctx was attached has no outstanding references. | |
262 | */ | |
263 | void tls_ctx_free(struct sock *sk, struct tls_context *ctx) | |
264 | { | |
265 | if (!ctx) | |
266 | return; | |
267 | ||
268 | memzero_explicit(&ctx->crypto_send, sizeof(ctx->crypto_send)); | |
269 | memzero_explicit(&ctx->crypto_recv, sizeof(ctx->crypto_recv)); | |
270 | mutex_destroy(&ctx->tx_lock); | |
271 | ||
272 | if (sk) | |
273 | kfree_rcu(ctx, rcu); | |
274 | else | |
275 | kfree(ctx); | |
276 | } | |
277 | ||
278 | static void tls_sk_proto_cleanup(struct sock *sk, | |
279 | struct tls_context *ctx, long timeo) | |
280 | { | |
281 | if (unlikely(sk->sk_write_pending) && | |
282 | !wait_on_pending_writer(sk, &timeo)) | |
283 | tls_handle_open_record(sk, 0); | |
284 | ||
285 | /* We need these for tls_sw_fallback handling of other packets */ | |
286 | if (ctx->tx_conf == TLS_SW) { | |
287 | kfree(ctx->tx.rec_seq); | |
288 | kfree(ctx->tx.iv); | |
289 | tls_sw_release_resources_tx(sk); | |
290 | TLS_DEC_STATS(sock_net(sk), LINUX_MIB_TLSCURRTXSW); | |
291 | } else if (ctx->tx_conf == TLS_HW) { | |
292 | tls_device_free_resources_tx(sk); | |
293 | TLS_DEC_STATS(sock_net(sk), LINUX_MIB_TLSCURRTXDEVICE); | |
294 | } | |
295 | ||
296 | if (ctx->rx_conf == TLS_SW) { | |
297 | tls_sw_release_resources_rx(sk); | |
298 | TLS_DEC_STATS(sock_net(sk), LINUX_MIB_TLSCURRRXSW); | |
299 | } else if (ctx->rx_conf == TLS_HW) { | |
300 | tls_device_offload_cleanup_rx(sk); | |
301 | TLS_DEC_STATS(sock_net(sk), LINUX_MIB_TLSCURRRXDEVICE); | |
302 | } | |
303 | } | |
304 | ||
305 | static void tls_sk_proto_close(struct sock *sk, long timeout) | |
306 | { | |
307 | struct inet_connection_sock *icsk = inet_csk(sk); | |
308 | struct tls_context *ctx = tls_get_ctx(sk); | |
309 | long timeo = sock_sndtimeo(sk, 0); | |
310 | bool free_ctx; | |
311 | ||
312 | if (ctx->tx_conf == TLS_SW) | |
313 | tls_sw_cancel_work_tx(ctx); | |
314 | ||
315 | lock_sock(sk); | |
316 | free_ctx = ctx->tx_conf != TLS_HW && ctx->rx_conf != TLS_HW; | |
317 | ||
318 | if (ctx->tx_conf != TLS_BASE || ctx->rx_conf != TLS_BASE) | |
319 | tls_sk_proto_cleanup(sk, ctx, timeo); | |
320 | ||
321 | write_lock_bh(&sk->sk_callback_lock); | |
322 | if (free_ctx) | |
323 | rcu_assign_pointer(icsk->icsk_ulp_data, NULL); | |
324 | sk->sk_prot = ctx->sk_proto; | |
325 | if (sk->sk_write_space == tls_write_space) | |
326 | sk->sk_write_space = ctx->sk_write_space; | |
327 | write_unlock_bh(&sk->sk_callback_lock); | |
328 | release_sock(sk); | |
329 | if (ctx->tx_conf == TLS_SW) | |
330 | tls_sw_free_ctx_tx(ctx); | |
331 | if (ctx->rx_conf == TLS_SW || ctx->rx_conf == TLS_HW) | |
332 | tls_sw_strparser_done(ctx); | |
333 | if (ctx->rx_conf == TLS_SW) | |
334 | tls_sw_free_ctx_rx(ctx); | |
335 | ctx->sk_proto->close(sk, timeout); | |
336 | ||
337 | if (free_ctx) | |
338 | tls_ctx_free(sk, ctx); | |
339 | } | |
340 | ||
341 | static int do_tls_getsockopt_tx(struct sock *sk, char __user *optval, | |
342 | int __user *optlen) | |
343 | { | |
344 | int rc = 0; | |
345 | struct tls_context *ctx = tls_get_ctx(sk); | |
346 | struct tls_crypto_info *crypto_info; | |
347 | int len; | |
348 | ||
349 | if (get_user(len, optlen)) | |
350 | return -EFAULT; | |
351 | ||
352 | if (!optval || (len < sizeof(*crypto_info))) { | |
353 | rc = -EINVAL; | |
354 | goto out; | |
355 | } | |
356 | ||
357 | if (!ctx) { | |
358 | rc = -EBUSY; | |
359 | goto out; | |
360 | } | |
361 | ||
362 | /* get user crypto info */ | |
363 | crypto_info = &ctx->crypto_send.info; | |
364 | ||
365 | if (!TLS_CRYPTO_INFO_READY(crypto_info)) { | |
366 | rc = -EBUSY; | |
367 | goto out; | |
368 | } | |
369 | ||
370 | if (len == sizeof(*crypto_info)) { | |
371 | if (copy_to_user(optval, crypto_info, sizeof(*crypto_info))) | |
372 | rc = -EFAULT; | |
373 | goto out; | |
374 | } | |
375 | ||
376 | switch (crypto_info->cipher_type) { | |
377 | case TLS_CIPHER_AES_GCM_128: { | |
378 | struct tls12_crypto_info_aes_gcm_128 * | |
379 | crypto_info_aes_gcm_128 = | |
380 | container_of(crypto_info, | |
381 | struct tls12_crypto_info_aes_gcm_128, | |
382 | info); | |
383 | ||
384 | if (len != sizeof(*crypto_info_aes_gcm_128)) { | |
385 | rc = -EINVAL; | |
386 | goto out; | |
387 | } | |
388 | lock_sock(sk); | |
389 | memcpy(crypto_info_aes_gcm_128->iv, | |
390 | ctx->tx.iv + TLS_CIPHER_AES_GCM_128_SALT_SIZE, | |
391 | TLS_CIPHER_AES_GCM_128_IV_SIZE); | |
392 | memcpy(crypto_info_aes_gcm_128->rec_seq, ctx->tx.rec_seq, | |
393 | TLS_CIPHER_AES_GCM_128_REC_SEQ_SIZE); | |
394 | release_sock(sk); | |
395 | if (copy_to_user(optval, | |
396 | crypto_info_aes_gcm_128, | |
397 | sizeof(*crypto_info_aes_gcm_128))) | |
398 | rc = -EFAULT; | |
399 | break; | |
400 | } | |
401 | case TLS_CIPHER_AES_GCM_256: { | |
402 | struct tls12_crypto_info_aes_gcm_256 * | |
403 | crypto_info_aes_gcm_256 = | |
404 | container_of(crypto_info, | |
405 | struct tls12_crypto_info_aes_gcm_256, | |
406 | info); | |
407 | ||
408 | if (len != sizeof(*crypto_info_aes_gcm_256)) { | |
409 | rc = -EINVAL; | |
410 | goto out; | |
411 | } | |
412 | lock_sock(sk); | |
413 | memcpy(crypto_info_aes_gcm_256->iv, | |
414 | ctx->tx.iv + TLS_CIPHER_AES_GCM_256_SALT_SIZE, | |
415 | TLS_CIPHER_AES_GCM_256_IV_SIZE); | |
416 | memcpy(crypto_info_aes_gcm_256->rec_seq, ctx->tx.rec_seq, | |
417 | TLS_CIPHER_AES_GCM_256_REC_SEQ_SIZE); | |
418 | release_sock(sk); | |
419 | if (copy_to_user(optval, | |
420 | crypto_info_aes_gcm_256, | |
421 | sizeof(*crypto_info_aes_gcm_256))) | |
422 | rc = -EFAULT; | |
423 | break; | |
424 | } | |
425 | default: | |
426 | rc = -EINVAL; | |
427 | } | |
428 | ||
429 | out: | |
430 | return rc; | |
431 | } | |
432 | ||
433 | static int do_tls_getsockopt(struct sock *sk, int optname, | |
434 | char __user *optval, int __user *optlen) | |
435 | { | |
436 | int rc = 0; | |
437 | ||
438 | switch (optname) { | |
439 | case TLS_TX: | |
440 | rc = do_tls_getsockopt_tx(sk, optval, optlen); | |
441 | break; | |
442 | default: | |
443 | rc = -ENOPROTOOPT; | |
444 | break; | |
445 | } | |
446 | return rc; | |
447 | } | |
448 | ||
449 | static int tls_getsockopt(struct sock *sk, int level, int optname, | |
450 | char __user *optval, int __user *optlen) | |
451 | { | |
452 | struct tls_context *ctx = tls_get_ctx(sk); | |
453 | ||
454 | if (level != SOL_TLS) | |
455 | return ctx->sk_proto->getsockopt(sk, level, | |
456 | optname, optval, optlen); | |
457 | ||
458 | return do_tls_getsockopt(sk, optname, optval, optlen); | |
459 | } | |
460 | ||
461 | static int do_tls_setsockopt_conf(struct sock *sk, char __user *optval, | |
462 | unsigned int optlen, int tx) | |
463 | { | |
464 | struct tls_crypto_info *crypto_info; | |
465 | struct tls_crypto_info *alt_crypto_info; | |
466 | struct tls_context *ctx = tls_get_ctx(sk); | |
467 | size_t optsize; | |
468 | int rc = 0; | |
469 | int conf; | |
470 | ||
471 | if (!optval || (optlen < sizeof(*crypto_info))) { | |
472 | rc = -EINVAL; | |
473 | goto out; | |
474 | } | |
475 | ||
476 | if (tx) { | |
477 | crypto_info = &ctx->crypto_send.info; | |
478 | alt_crypto_info = &ctx->crypto_recv.info; | |
479 | } else { | |
480 | crypto_info = &ctx->crypto_recv.info; | |
481 | alt_crypto_info = &ctx->crypto_send.info; | |
482 | } | |
483 | ||
484 | /* Currently we don't support set crypto info more than one time */ | |
485 | if (TLS_CRYPTO_INFO_READY(crypto_info)) { | |
486 | rc = -EBUSY; | |
487 | goto out; | |
488 | } | |
489 | ||
490 | rc = copy_from_user(crypto_info, optval, sizeof(*crypto_info)); | |
491 | if (rc) { | |
492 | rc = -EFAULT; | |
493 | goto err_crypto_info; | |
494 | } | |
495 | ||
496 | /* check version */ | |
497 | if (crypto_info->version != TLS_1_2_VERSION && | |
498 | crypto_info->version != TLS_1_3_VERSION) { | |
499 | rc = -ENOTSUPP; | |
500 | goto err_crypto_info; | |
501 | } | |
502 | ||
503 | /* Ensure that TLS version and ciphers are same in both directions */ | |
504 | if (TLS_CRYPTO_INFO_READY(alt_crypto_info)) { | |
505 | if (alt_crypto_info->version != crypto_info->version || | |
506 | alt_crypto_info->cipher_type != crypto_info->cipher_type) { | |
507 | rc = -EINVAL; | |
508 | goto err_crypto_info; | |
509 | } | |
510 | } | |
511 | ||
512 | switch (crypto_info->cipher_type) { | |
513 | case TLS_CIPHER_AES_GCM_128: | |
514 | optsize = sizeof(struct tls12_crypto_info_aes_gcm_128); | |
515 | break; | |
516 | case TLS_CIPHER_AES_GCM_256: { | |
517 | optsize = sizeof(struct tls12_crypto_info_aes_gcm_256); | |
518 | break; | |
519 | } | |
520 | case TLS_CIPHER_AES_CCM_128: | |
521 | optsize = sizeof(struct tls12_crypto_info_aes_ccm_128); | |
522 | break; | |
523 | default: | |
524 | rc = -EINVAL; | |
525 | goto err_crypto_info; | |
526 | } | |
527 | ||
528 | if (optlen != optsize) { | |
529 | rc = -EINVAL; | |
530 | goto err_crypto_info; | |
531 | } | |
532 | ||
533 | rc = copy_from_user(crypto_info + 1, optval + sizeof(*crypto_info), | |
534 | optlen - sizeof(*crypto_info)); | |
535 | if (rc) { | |
536 | rc = -EFAULT; | |
537 | goto err_crypto_info; | |
538 | } | |
539 | ||
540 | if (tx) { | |
541 | rc = tls_set_device_offload(sk, ctx); | |
542 | conf = TLS_HW; | |
543 | if (!rc) { | |
544 | TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSTXDEVICE); | |
545 | TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSCURRTXDEVICE); | |
546 | } else { | |
547 | rc = tls_set_sw_offload(sk, ctx, 1); | |
548 | if (rc) | |
549 | goto err_crypto_info; | |
550 | TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSTXSW); | |
551 | TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSCURRTXSW); | |
552 | conf = TLS_SW; | |
553 | } | |
554 | } else { | |
555 | rc = tls_set_device_offload_rx(sk, ctx); | |
556 | conf = TLS_HW; | |
557 | if (!rc) { | |
558 | TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSRXDEVICE); | |
559 | TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSCURRRXDEVICE); | |
560 | } else { | |
561 | rc = tls_set_sw_offload(sk, ctx, 0); | |
562 | if (rc) | |
563 | goto err_crypto_info; | |
564 | TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSRXSW); | |
565 | TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSCURRRXSW); | |
566 | conf = TLS_SW; | |
567 | } | |
568 | tls_sw_strparser_arm(sk, ctx); | |
569 | } | |
570 | ||
571 | if (tx) | |
572 | ctx->tx_conf = conf; | |
573 | else | |
574 | ctx->rx_conf = conf; | |
575 | update_sk_prot(sk, ctx); | |
576 | if (tx) { | |
577 | ctx->sk_write_space = sk->sk_write_space; | |
578 | sk->sk_write_space = tls_write_space; | |
579 | } else { | |
580 | sk->sk_socket->ops = &tls_sw_proto_ops; | |
581 | } | |
582 | goto out; | |
583 | ||
584 | err_crypto_info: | |
585 | memzero_explicit(crypto_info, sizeof(union tls_crypto_context)); | |
586 | out: | |
587 | return rc; | |
588 | } | |
589 | ||
590 | static int do_tls_setsockopt(struct sock *sk, int optname, | |
591 | char __user *optval, unsigned int optlen) | |
592 | { | |
593 | int rc = 0; | |
594 | ||
595 | switch (optname) { | |
596 | case TLS_TX: | |
597 | case TLS_RX: | |
598 | lock_sock(sk); | |
599 | rc = do_tls_setsockopt_conf(sk, optval, optlen, | |
600 | optname == TLS_TX); | |
601 | release_sock(sk); | |
602 | break; | |
603 | default: | |
604 | rc = -ENOPROTOOPT; | |
605 | break; | |
606 | } | |
607 | return rc; | |
608 | } | |
609 | ||
610 | static int tls_setsockopt(struct sock *sk, int level, int optname, | |
611 | char __user *optval, unsigned int optlen) | |
612 | { | |
613 | struct tls_context *ctx = tls_get_ctx(sk); | |
614 | ||
615 | if (level != SOL_TLS) | |
616 | return ctx->sk_proto->setsockopt(sk, level, optname, optval, | |
617 | optlen); | |
618 | ||
619 | return do_tls_setsockopt(sk, optname, optval, optlen); | |
620 | } | |
621 | ||
622 | struct tls_context *tls_ctx_create(struct sock *sk) | |
623 | { | |
624 | struct inet_connection_sock *icsk = inet_csk(sk); | |
625 | struct tls_context *ctx; | |
626 | ||
627 | ctx = kzalloc(sizeof(*ctx), GFP_ATOMIC); | |
628 | if (!ctx) | |
629 | return NULL; | |
630 | ||
631 | mutex_init(&ctx->tx_lock); | |
632 | rcu_assign_pointer(icsk->icsk_ulp_data, ctx); | |
633 | ctx->sk_proto = sk->sk_prot; | |
634 | return ctx; | |
635 | } | |
636 | ||
637 | static void tls_build_proto(struct sock *sk) | |
638 | { | |
639 | int ip_ver = sk->sk_family == AF_INET6 ? TLSV6 : TLSV4; | |
640 | ||
641 | /* Build IPv6 TLS whenever the address of tcpv6 _prot changes */ | |
642 | if (ip_ver == TLSV6 && | |
643 | unlikely(sk->sk_prot != smp_load_acquire(&saved_tcpv6_prot))) { | |
644 | mutex_lock(&tcpv6_prot_mutex); | |
645 | if (likely(sk->sk_prot != saved_tcpv6_prot)) { | |
646 | build_protos(tls_prots[TLSV6], sk->sk_prot); | |
647 | smp_store_release(&saved_tcpv6_prot, sk->sk_prot); | |
648 | } | |
649 | mutex_unlock(&tcpv6_prot_mutex); | |
650 | } | |
651 | ||
652 | if (ip_ver == TLSV4 && | |
653 | unlikely(sk->sk_prot != smp_load_acquire(&saved_tcpv4_prot))) { | |
654 | mutex_lock(&tcpv4_prot_mutex); | |
655 | if (likely(sk->sk_prot != saved_tcpv4_prot)) { | |
656 | build_protos(tls_prots[TLSV4], sk->sk_prot); | |
657 | smp_store_release(&saved_tcpv4_prot, sk->sk_prot); | |
658 | } | |
659 | mutex_unlock(&tcpv4_prot_mutex); | |
660 | } | |
661 | } | |
662 | ||
663 | static void build_protos(struct proto prot[TLS_NUM_CONFIG][TLS_NUM_CONFIG], | |
664 | struct proto *base) | |
665 | { | |
666 | prot[TLS_BASE][TLS_BASE] = *base; | |
667 | prot[TLS_BASE][TLS_BASE].setsockopt = tls_setsockopt; | |
668 | prot[TLS_BASE][TLS_BASE].getsockopt = tls_getsockopt; | |
669 | prot[TLS_BASE][TLS_BASE].close = tls_sk_proto_close; | |
670 | ||
671 | prot[TLS_SW][TLS_BASE] = prot[TLS_BASE][TLS_BASE]; | |
672 | prot[TLS_SW][TLS_BASE].sendmsg = tls_sw_sendmsg; | |
673 | prot[TLS_SW][TLS_BASE].sendpage = tls_sw_sendpage; | |
674 | ||
675 | prot[TLS_BASE][TLS_SW] = prot[TLS_BASE][TLS_BASE]; | |
676 | prot[TLS_BASE][TLS_SW].recvmsg = tls_sw_recvmsg; | |
677 | prot[TLS_BASE][TLS_SW].stream_memory_read = tls_sw_stream_read; | |
678 | prot[TLS_BASE][TLS_SW].close = tls_sk_proto_close; | |
679 | ||
680 | prot[TLS_SW][TLS_SW] = prot[TLS_SW][TLS_BASE]; | |
681 | prot[TLS_SW][TLS_SW].recvmsg = tls_sw_recvmsg; | |
682 | prot[TLS_SW][TLS_SW].stream_memory_read = tls_sw_stream_read; | |
683 | prot[TLS_SW][TLS_SW].close = tls_sk_proto_close; | |
684 | ||
685 | #ifdef CONFIG_TLS_DEVICE | |
686 | prot[TLS_HW][TLS_BASE] = prot[TLS_BASE][TLS_BASE]; | |
687 | prot[TLS_HW][TLS_BASE].sendmsg = tls_device_sendmsg; | |
688 | prot[TLS_HW][TLS_BASE].sendpage = tls_device_sendpage; | |
689 | ||
690 | prot[TLS_HW][TLS_SW] = prot[TLS_BASE][TLS_SW]; | |
691 | prot[TLS_HW][TLS_SW].sendmsg = tls_device_sendmsg; | |
692 | prot[TLS_HW][TLS_SW].sendpage = tls_device_sendpage; | |
693 | ||
694 | prot[TLS_BASE][TLS_HW] = prot[TLS_BASE][TLS_SW]; | |
695 | ||
696 | prot[TLS_SW][TLS_HW] = prot[TLS_SW][TLS_SW]; | |
697 | ||
698 | prot[TLS_HW][TLS_HW] = prot[TLS_HW][TLS_SW]; | |
699 | #endif | |
700 | #ifdef CONFIG_TLS_TOE | |
701 | prot[TLS_HW_RECORD][TLS_HW_RECORD] = *base; | |
702 | prot[TLS_HW_RECORD][TLS_HW_RECORD].hash = tls_toe_hash; | |
703 | prot[TLS_HW_RECORD][TLS_HW_RECORD].unhash = tls_toe_unhash; | |
704 | #endif | |
705 | } | |
706 | ||
707 | static int tls_init(struct sock *sk) | |
708 | { | |
709 | struct tls_context *ctx; | |
710 | int rc = 0; | |
711 | ||
712 | tls_build_proto(sk); | |
713 | ||
714 | #ifdef CONFIG_TLS_TOE | |
715 | if (tls_toe_bypass(sk)) | |
716 | return 0; | |
717 | #endif | |
718 | ||
719 | /* The TLS ulp is currently supported only for TCP sockets | |
720 | * in ESTABLISHED state. | |
721 | * Supporting sockets in LISTEN state will require us | |
722 | * to modify the accept implementation to clone rather then | |
723 | * share the ulp context. | |
724 | */ | |
725 | if (sk->sk_state != TCP_ESTABLISHED) | |
726 | return -ENOTSUPP; | |
727 | ||
728 | /* allocate tls context */ | |
729 | write_lock_bh(&sk->sk_callback_lock); | |
730 | ctx = tls_ctx_create(sk); | |
731 | if (!ctx) { | |
732 | rc = -ENOMEM; | |
733 | goto out; | |
734 | } | |
735 | ||
736 | ctx->tx_conf = TLS_BASE; | |
737 | ctx->rx_conf = TLS_BASE; | |
738 | update_sk_prot(sk, ctx); | |
739 | out: | |
740 | write_unlock_bh(&sk->sk_callback_lock); | |
741 | return rc; | |
742 | } | |
743 | ||
744 | static void tls_update(struct sock *sk, struct proto *p) | |
745 | { | |
746 | struct tls_context *ctx; | |
747 | ||
748 | ctx = tls_get_ctx(sk); | |
749 | if (likely(ctx)) | |
750 | ctx->sk_proto = p; | |
751 | else | |
752 | sk->sk_prot = p; | |
753 | } | |
754 | ||
755 | static int tls_get_info(const struct sock *sk, struct sk_buff *skb) | |
756 | { | |
757 | u16 version, cipher_type; | |
758 | struct tls_context *ctx; | |
759 | struct nlattr *start; | |
760 | int err; | |
761 | ||
762 | start = nla_nest_start_noflag(skb, INET_ULP_INFO_TLS); | |
763 | if (!start) | |
764 | return -EMSGSIZE; | |
765 | ||
766 | rcu_read_lock(); | |
767 | ctx = rcu_dereference(inet_csk(sk)->icsk_ulp_data); | |
768 | if (!ctx) { | |
769 | err = 0; | |
770 | goto nla_failure; | |
771 | } | |
772 | version = ctx->prot_info.version; | |
773 | if (version) { | |
774 | err = nla_put_u16(skb, TLS_INFO_VERSION, version); | |
775 | if (err) | |
776 | goto nla_failure; | |
777 | } | |
778 | cipher_type = ctx->prot_info.cipher_type; | |
779 | if (cipher_type) { | |
780 | err = nla_put_u16(skb, TLS_INFO_CIPHER, cipher_type); | |
781 | if (err) | |
782 | goto nla_failure; | |
783 | } | |
784 | err = nla_put_u16(skb, TLS_INFO_TXCONF, tls_user_config(ctx, true)); | |
785 | if (err) | |
786 | goto nla_failure; | |
787 | ||
788 | err = nla_put_u16(skb, TLS_INFO_RXCONF, tls_user_config(ctx, false)); | |
789 | if (err) | |
790 | goto nla_failure; | |
791 | ||
792 | rcu_read_unlock(); | |
793 | nla_nest_end(skb, start); | |
794 | return 0; | |
795 | ||
796 | nla_failure: | |
797 | rcu_read_unlock(); | |
798 | nla_nest_cancel(skb, start); | |
799 | return err; | |
800 | } | |
801 | ||
802 | static size_t tls_get_info_size(const struct sock *sk) | |
803 | { | |
804 | size_t size = 0; | |
805 | ||
806 | size += nla_total_size(0) + /* INET_ULP_INFO_TLS */ | |
807 | nla_total_size(sizeof(u16)) + /* TLS_INFO_VERSION */ | |
808 | nla_total_size(sizeof(u16)) + /* TLS_INFO_CIPHER */ | |
809 | nla_total_size(sizeof(u16)) + /* TLS_INFO_RXCONF */ | |
810 | nla_total_size(sizeof(u16)) + /* TLS_INFO_TXCONF */ | |
811 | 0; | |
812 | ||
813 | return size; | |
814 | } | |
815 | ||
816 | static int __net_init tls_init_net(struct net *net) | |
817 | { | |
818 | int err; | |
819 | ||
820 | net->mib.tls_statistics = alloc_percpu(struct linux_tls_mib); | |
821 | if (!net->mib.tls_statistics) | |
822 | return -ENOMEM; | |
823 | ||
824 | err = tls_proc_init(net); | |
825 | if (err) | |
826 | goto err_free_stats; | |
827 | ||
828 | return 0; | |
829 | err_free_stats: | |
830 | free_percpu(net->mib.tls_statistics); | |
831 | return err; | |
832 | } | |
833 | ||
834 | static void __net_exit tls_exit_net(struct net *net) | |
835 | { | |
836 | tls_proc_fini(net); | |
837 | free_percpu(net->mib.tls_statistics); | |
838 | } | |
839 | ||
840 | static struct pernet_operations tls_proc_ops = { | |
841 | .init = tls_init_net, | |
842 | .exit = tls_exit_net, | |
843 | }; | |
844 | ||
845 | static struct tcp_ulp_ops tcp_tls_ulp_ops __read_mostly = { | |
846 | .name = "tls", | |
847 | .owner = THIS_MODULE, | |
848 | .init = tls_init, | |
849 | .update = tls_update, | |
850 | .get_info = tls_get_info, | |
851 | .get_info_size = tls_get_info_size, | |
852 | }; | |
853 | ||
854 | static int __init tls_register(void) | |
855 | { | |
856 | int err; | |
857 | ||
858 | err = register_pernet_subsys(&tls_proc_ops); | |
859 | if (err) | |
860 | return err; | |
861 | ||
862 | tls_sw_proto_ops = inet_stream_ops; | |
863 | tls_sw_proto_ops.splice_read = tls_sw_splice_read; | |
864 | tls_sw_proto_ops.sendpage_locked = tls_sw_sendpage_locked, | |
865 | ||
866 | tls_device_init(); | |
867 | tcp_register_ulp(&tcp_tls_ulp_ops); | |
868 | ||
869 | return 0; | |
870 | } | |
871 | ||
872 | static void __exit tls_unregister(void) | |
873 | { | |
874 | tcp_unregister_ulp(&tcp_tls_ulp_ops); | |
875 | tls_device_cleanup(); | |
876 | unregister_pernet_subsys(&tls_proc_ops); | |
877 | } | |
878 | ||
879 | module_init(tls_register); | |
880 | module_exit(tls_unregister); |