]>
Commit | Line | Data |
---|---|---|
3c4d7559 DW |
1 | /* |
2 | * Copyright (c) 2016-2017, Mellanox Technologies. All rights reserved. | |
3 | * Copyright (c) 2016-2017, Dave Watson <davejwatson@fb.com>. All rights reserved. | |
4 | * | |
5 | * This software is available to you under a choice of one of two | |
6 | * licenses. You may choose to be licensed under the terms of the GNU | |
7 | * General Public License (GPL) Version 2, available from the file | |
8 | * COPYING in the main directory of this source tree, or the | |
9 | * OpenIB.org BSD license below: | |
10 | * | |
11 | * Redistribution and use in source and binary forms, with or | |
12 | * without modification, are permitted provided that the following | |
13 | * conditions are met: | |
14 | * | |
15 | * - Redistributions of source code must retain the above | |
16 | * copyright notice, this list of conditions and the following | |
17 | * disclaimer. | |
18 | * | |
19 | * - Redistributions in binary form must reproduce the above | |
20 | * copyright notice, this list of conditions and the following | |
21 | * disclaimer in the documentation and/or other materials | |
22 | * provided with the distribution. | |
23 | * | |
24 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, | |
25 | * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF | |
26 | * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND | |
27 | * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS | |
28 | * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN | |
29 | * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN | |
30 | * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE | |
31 | * SOFTWARE. | |
32 | */ | |
33 | ||
34 | #include <linux/module.h> | |
35 | ||
36 | #include <net/tcp.h> | |
37 | #include <net/inet_common.h> | |
38 | #include <linux/highmem.h> | |
39 | #include <linux/netdevice.h> | |
40 | #include <linux/sched/signal.h> | |
dd0bed16 | 41 | #include <linux/inetdevice.h> |
3c4d7559 DW |
42 | |
43 | #include <net/tls.h> | |
44 | ||
45 | MODULE_AUTHOR("Mellanox Technologies"); | |
46 | MODULE_DESCRIPTION("Transport Layer Security Support"); | |
47 | MODULE_LICENSE("Dual BSD/GPL"); | |
037b0b86 | 48 | MODULE_ALIAS_TCP_ULP("tls"); |
3c4d7559 | 49 | |
c113187d BP |
50 | enum { |
51 | TLSV4, | |
52 | TLSV6, | |
53 | TLS_NUM_PROTS, | |
54 | }; | |
6d88207f | 55 | |
c113187d BP |
56 | static struct proto *saved_tcpv6_prot; |
57 | static DEFINE_MUTEX(tcpv6_prot_mutex); | |
28cb6f1e JF |
58 | static struct proto *saved_tcpv4_prot; |
59 | static DEFINE_MUTEX(tcpv4_prot_mutex); | |
dd0bed16 | 60 | static LIST_HEAD(device_list); |
df9d4a17 | 61 | static DEFINE_SPINLOCK(device_spinlock); |
f66de3ee | 62 | static struct proto tls_prots[TLS_NUM_PROTS][TLS_NUM_CONFIG][TLS_NUM_CONFIG]; |
c46234eb | 63 | static struct proto_ops tls_sw_proto_ops; |
63a6b3fe AG |
64 | static void build_protos(struct proto prot[TLS_NUM_CONFIG][TLS_NUM_CONFIG], |
65 | struct proto *base); | |
6d88207f | 66 | |
f66de3ee | 67 | static void update_sk_prot(struct sock *sk, struct tls_context *ctx) |
6d88207f | 68 | { |
c113187d BP |
69 | int ip_ver = sk->sk_family == AF_INET6 ? TLSV6 : TLSV4; |
70 | ||
f66de3ee | 71 | sk->sk_prot = &tls_prots[ip_ver][ctx->tx_conf][ctx->rx_conf]; |
6d88207f | 72 | } |
3c4d7559 DW |
73 | |
74 | int wait_on_pending_writer(struct sock *sk, long *timeo) | |
75 | { | |
76 | int rc = 0; | |
77 | DEFINE_WAIT_FUNC(wait, woken_wake_function); | |
78 | ||
79 | add_wait_queue(sk_sleep(sk), &wait); | |
80 | while (1) { | |
81 | if (!*timeo) { | |
82 | rc = -EAGAIN; | |
83 | break; | |
84 | } | |
85 | ||
86 | if (signal_pending(current)) { | |
87 | rc = sock_intr_errno(*timeo); | |
88 | break; | |
89 | } | |
90 | ||
91 | if (sk_wait_event(sk, timeo, !sk->sk_write_pending, &wait)) | |
92 | break; | |
93 | } | |
94 | remove_wait_queue(sk_sleep(sk), &wait); | |
95 | return rc; | |
96 | } | |
97 | ||
98 | int tls_push_sg(struct sock *sk, | |
99 | struct tls_context *ctx, | |
100 | struct scatterlist *sg, | |
101 | u16 first_offset, | |
102 | int flags) | |
103 | { | |
104 | int sendpage_flags = flags | MSG_SENDPAGE_NOTLAST; | |
105 | int ret = 0; | |
106 | struct page *p; | |
107 | size_t size; | |
108 | int offset = first_offset; | |
109 | ||
110 | size = sg->length - offset; | |
111 | offset += sg->offset; | |
112 | ||
c212d2c7 | 113 | ctx->in_tcp_sendpages = true; |
3c4d7559 DW |
114 | while (1) { |
115 | if (sg_is_last(sg)) | |
116 | sendpage_flags = flags; | |
117 | ||
118 | /* is sending application-limited? */ | |
119 | tcp_rate_check_app_limited(sk); | |
120 | p = sg_page(sg); | |
121 | retry: | |
122 | ret = do_tcp_sendpages(sk, p, offset, size, sendpage_flags); | |
123 | ||
124 | if (ret != size) { | |
125 | if (ret > 0) { | |
126 | offset += ret; | |
127 | size -= ret; | |
128 | goto retry; | |
129 | } | |
130 | ||
131 | offset -= sg->offset; | |
132 | ctx->partially_sent_offset = offset; | |
133 | ctx->partially_sent_record = (void *)sg; | |
080324c3 | 134 | ctx->in_tcp_sendpages = false; |
3c4d7559 DW |
135 | return ret; |
136 | } | |
137 | ||
138 | put_page(p); | |
139 | sk_mem_uncharge(sk, sg->length); | |
140 | sg = sg_next(sg); | |
141 | if (!sg) | |
142 | break; | |
143 | ||
144 | offset = sg->offset; | |
145 | size = sg->length; | |
146 | } | |
147 | ||
c212d2c7 DW |
148 | ctx->in_tcp_sendpages = false; |
149 | ctx->sk_write_space(sk); | |
3c4d7559 DW |
150 | |
151 | return 0; | |
152 | } | |
153 | ||
154 | static int tls_handle_open_record(struct sock *sk, int flags) | |
155 | { | |
156 | struct tls_context *ctx = tls_get_ctx(sk); | |
157 | ||
158 | if (tls_is_pending_open_record(ctx)) | |
159 | return ctx->push_pending_record(sk, flags); | |
160 | ||
161 | return 0; | |
162 | } | |
163 | ||
164 | int tls_proccess_cmsg(struct sock *sk, struct msghdr *msg, | |
165 | unsigned char *record_type) | |
166 | { | |
167 | struct cmsghdr *cmsg; | |
168 | int rc = -EINVAL; | |
169 | ||
170 | for_each_cmsghdr(cmsg, msg) { | |
171 | if (!CMSG_OK(msg, cmsg)) | |
172 | return -EINVAL; | |
173 | if (cmsg->cmsg_level != SOL_TLS) | |
174 | continue; | |
175 | ||
176 | switch (cmsg->cmsg_type) { | |
177 | case TLS_SET_RECORD_TYPE: | |
178 | if (cmsg->cmsg_len < CMSG_LEN(sizeof(*record_type))) | |
179 | return -EINVAL; | |
180 | ||
181 | if (msg->msg_flags & MSG_MORE) | |
182 | return -EINVAL; | |
183 | ||
184 | rc = tls_handle_open_record(sk, msg->msg_flags); | |
185 | if (rc) | |
186 | return rc; | |
187 | ||
188 | *record_type = *(unsigned char *)CMSG_DATA(cmsg); | |
189 | rc = 0; | |
190 | break; | |
191 | default: | |
192 | return -EINVAL; | |
193 | } | |
194 | } | |
195 | ||
196 | return rc; | |
197 | } | |
198 | ||
a42055e8 VG |
199 | int tls_push_partial_record(struct sock *sk, struct tls_context *ctx, |
200 | int flags) | |
3c4d7559 DW |
201 | { |
202 | struct scatterlist *sg; | |
203 | u16 offset; | |
204 | ||
3c4d7559 DW |
205 | sg = ctx->partially_sent_record; |
206 | offset = ctx->partially_sent_offset; | |
207 | ||
208 | ctx->partially_sent_record = NULL; | |
209 | return tls_push_sg(sk, ctx, sg, offset, flags); | |
210 | } | |
211 | ||
a42055e8 VG |
212 | int tls_push_pending_closed_record(struct sock *sk, |
213 | struct tls_context *tls_ctx, | |
214 | int flags, long *timeo) | |
215 | { | |
216 | struct tls_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx); | |
217 | ||
218 | if (tls_is_partially_sent_record(tls_ctx) || | |
9932a29a | 219 | !list_empty(&ctx->tx_list)) |
a42055e8 VG |
220 | return tls_tx_records(sk, flags); |
221 | else | |
222 | return tls_ctx->push_pending_record(sk, flags); | |
223 | } | |
224 | ||
3c4d7559 DW |
225 | static void tls_write_space(struct sock *sk) |
226 | { | |
227 | struct tls_context *ctx = tls_get_ctx(sk); | |
a42055e8 | 228 | struct tls_sw_context_tx *tx_ctx = tls_sw_ctx_tx(ctx); |
3c4d7559 | 229 | |
67db7cd2 JF |
230 | /* If in_tcp_sendpages call lower protocol write space handler |
231 | * to ensure we wake up any waiting operations there. For example | |
232 | * if do_tcp_sendpages where to call sk_wait_event. | |
233 | */ | |
234 | if (ctx->in_tcp_sendpages) { | |
235 | ctx->sk_write_space(sk); | |
c212d2c7 | 236 | return; |
67db7cd2 | 237 | } |
c212d2c7 | 238 | |
a42055e8 | 239 | /* Schedule the transmission if tx list is ready */ |
9932a29a | 240 | if (is_tx_ready(tx_ctx) && !sk->sk_write_pending) { |
a42055e8 VG |
241 | /* Schedule the transmission */ |
242 | if (!test_and_set_bit(BIT_TX_SCHEDULED, &tx_ctx->tx_bitmask)) | |
243 | schedule_delayed_work(&tx_ctx->tx_work.work, 0); | |
3c4d7559 DW |
244 | } |
245 | ||
246 | ctx->sk_write_space(sk); | |
247 | } | |
248 | ||
86029d10 SD |
249 | static void tls_ctx_free(struct tls_context *ctx) |
250 | { | |
251 | if (!ctx) | |
252 | return; | |
253 | ||
254 | memzero_explicit(&ctx->crypto_send, sizeof(ctx->crypto_send)); | |
255 | memzero_explicit(&ctx->crypto_recv, sizeof(ctx->crypto_recv)); | |
256 | kfree(ctx); | |
257 | } | |
258 | ||
3c4d7559 DW |
259 | static void tls_sk_proto_close(struct sock *sk, long timeout) |
260 | { | |
261 | struct tls_context *ctx = tls_get_ctx(sk); | |
262 | long timeo = sock_sndtimeo(sk, 0); | |
263 | void (*sk_proto_close)(struct sock *sk, long timeout); | |
98f0a395 | 264 | bool free_ctx = false; |
3c4d7559 DW |
265 | |
266 | lock_sock(sk); | |
ff45d820 IL |
267 | sk_proto_close = ctx->sk_proto_close; |
268 | ||
76f7164d AG |
269 | if (ctx->tx_conf == TLS_HW_RECORD && ctx->rx_conf == TLS_HW_RECORD) |
270 | goto skip_tx_cleanup; | |
271 | ||
272 | if (ctx->tx_conf == TLS_BASE && ctx->rx_conf == TLS_BASE) { | |
98f0a395 | 273 | free_ctx = true; |
ff45d820 IL |
274 | goto skip_tx_cleanup; |
275 | } | |
3c4d7559 DW |
276 | |
277 | if (!tls_complete_pending_work(sk, ctx, 0, &timeo)) | |
278 | tls_handle_open_record(sk, 0); | |
279 | ||
f66de3ee BP |
280 | /* We need these for tls_sw_fallback handling of other packets */ |
281 | if (ctx->tx_conf == TLS_SW) { | |
282 | kfree(ctx->tx.rec_seq); | |
283 | kfree(ctx->tx.iv); | |
284 | tls_sw_free_resources_tx(sk); | |
285 | } | |
3c4d7559 | 286 | |
f66de3ee BP |
287 | if (ctx->rx_conf == TLS_SW) { |
288 | kfree(ctx->rx.rec_seq); | |
289 | kfree(ctx->rx.iv); | |
290 | tls_sw_free_resources_rx(sk); | |
c46234eb | 291 | } |
3c4d7559 | 292 | |
e8f69799 | 293 | #ifdef CONFIG_TLS_DEVICE |
4799ac81 BP |
294 | if (ctx->rx_conf == TLS_HW) |
295 | tls_device_offload_cleanup_rx(sk); | |
296 | ||
297 | if (ctx->tx_conf != TLS_HW && ctx->rx_conf != TLS_HW) { | |
e8f69799 IL |
298 | #else |
299 | { | |
300 | #endif | |
86029d10 | 301 | tls_ctx_free(ctx); |
e8f69799 IL |
302 | ctx = NULL; |
303 | } | |
304 | ||
ff45d820 | 305 | skip_tx_cleanup: |
3c4d7559 DW |
306 | release_sock(sk); |
307 | sk_proto_close(sk, timeout); | |
dd0bed16 AG |
308 | /* free ctx for TLS_HW_RECORD, used by tcp_set_state |
309 | * for sk->sk_prot->unhash [tls_hw_unhash] | |
310 | */ | |
98f0a395 | 311 | if (free_ctx) |
86029d10 | 312 | tls_ctx_free(ctx); |
3c4d7559 DW |
313 | } |
314 | ||
315 | static int do_tls_getsockopt_tx(struct sock *sk, char __user *optval, | |
316 | int __user *optlen) | |
317 | { | |
318 | int rc = 0; | |
319 | struct tls_context *ctx = tls_get_ctx(sk); | |
320 | struct tls_crypto_info *crypto_info; | |
321 | int len; | |
322 | ||
323 | if (get_user(len, optlen)) | |
324 | return -EFAULT; | |
325 | ||
326 | if (!optval || (len < sizeof(*crypto_info))) { | |
327 | rc = -EINVAL; | |
328 | goto out; | |
329 | } | |
330 | ||
331 | if (!ctx) { | |
332 | rc = -EBUSY; | |
333 | goto out; | |
334 | } | |
335 | ||
336 | /* get user crypto info */ | |
86029d10 | 337 | crypto_info = &ctx->crypto_send.info; |
3c4d7559 DW |
338 | |
339 | if (!TLS_CRYPTO_INFO_READY(crypto_info)) { | |
340 | rc = -EBUSY; | |
341 | goto out; | |
342 | } | |
343 | ||
5a3b886c | 344 | if (len == sizeof(*crypto_info)) { |
ac55cd61 DC |
345 | if (copy_to_user(optval, crypto_info, sizeof(*crypto_info))) |
346 | rc = -EFAULT; | |
3c4d7559 DW |
347 | goto out; |
348 | } | |
349 | ||
350 | switch (crypto_info->cipher_type) { | |
351 | case TLS_CIPHER_AES_GCM_128: { | |
352 | struct tls12_crypto_info_aes_gcm_128 * | |
353 | crypto_info_aes_gcm_128 = | |
354 | container_of(crypto_info, | |
355 | struct tls12_crypto_info_aes_gcm_128, | |
356 | info); | |
357 | ||
358 | if (len != sizeof(*crypto_info_aes_gcm_128)) { | |
359 | rc = -EINVAL; | |
360 | goto out; | |
361 | } | |
362 | lock_sock(sk); | |
a1dfa681 | 363 | memcpy(crypto_info_aes_gcm_128->iv, |
dbe42559 | 364 | ctx->tx.iv + TLS_CIPHER_AES_GCM_128_SALT_SIZE, |
3c4d7559 | 365 | TLS_CIPHER_AES_GCM_128_IV_SIZE); |
dbe42559 | 366 | memcpy(crypto_info_aes_gcm_128->rec_seq, ctx->tx.rec_seq, |
c410c196 | 367 | TLS_CIPHER_AES_GCM_128_REC_SEQ_SIZE); |
3c4d7559 | 368 | release_sock(sk); |
ac55cd61 DC |
369 | if (copy_to_user(optval, |
370 | crypto_info_aes_gcm_128, | |
371 | sizeof(*crypto_info_aes_gcm_128))) | |
372 | rc = -EFAULT; | |
3c4d7559 DW |
373 | break; |
374 | } | |
375 | default: | |
376 | rc = -EINVAL; | |
377 | } | |
378 | ||
379 | out: | |
380 | return rc; | |
381 | } | |
382 | ||
383 | static int do_tls_getsockopt(struct sock *sk, int optname, | |
384 | char __user *optval, int __user *optlen) | |
385 | { | |
386 | int rc = 0; | |
387 | ||
388 | switch (optname) { | |
389 | case TLS_TX: | |
390 | rc = do_tls_getsockopt_tx(sk, optval, optlen); | |
391 | break; | |
392 | default: | |
393 | rc = -ENOPROTOOPT; | |
394 | break; | |
395 | } | |
396 | return rc; | |
397 | } | |
398 | ||
399 | static int tls_getsockopt(struct sock *sk, int level, int optname, | |
400 | char __user *optval, int __user *optlen) | |
401 | { | |
402 | struct tls_context *ctx = tls_get_ctx(sk); | |
403 | ||
404 | if (level != SOL_TLS) | |
405 | return ctx->getsockopt(sk, level, optname, optval, optlen); | |
406 | ||
407 | return do_tls_getsockopt(sk, optname, optval, optlen); | |
408 | } | |
409 | ||
c46234eb DW |
410 | static int do_tls_setsockopt_conf(struct sock *sk, char __user *optval, |
411 | unsigned int optlen, int tx) | |
3c4d7559 | 412 | { |
196c31b4 | 413 | struct tls_crypto_info *crypto_info; |
3c4d7559 | 414 | struct tls_context *ctx = tls_get_ctx(sk); |
3c4d7559 | 415 | int rc = 0; |
58371585 | 416 | int conf; |
3c4d7559 DW |
417 | |
418 | if (!optval || (optlen < sizeof(*crypto_info))) { | |
419 | rc = -EINVAL; | |
420 | goto out; | |
421 | } | |
422 | ||
c46234eb | 423 | if (tx) |
86029d10 | 424 | crypto_info = &ctx->crypto_send.info; |
c46234eb | 425 | else |
86029d10 | 426 | crypto_info = &ctx->crypto_recv.info; |
c46234eb | 427 | |
196c31b4 | 428 | /* Currently we don't support set crypto info more than one time */ |
877d17c7 SD |
429 | if (TLS_CRYPTO_INFO_READY(crypto_info)) { |
430 | rc = -EBUSY; | |
196c31b4 | 431 | goto out; |
877d17c7 | 432 | } |
196c31b4 IL |
433 | |
434 | rc = copy_from_user(crypto_info, optval, sizeof(*crypto_info)); | |
3c4d7559 DW |
435 | if (rc) { |
436 | rc = -EFAULT; | |
257082e6 | 437 | goto err_crypto_info; |
3c4d7559 DW |
438 | } |
439 | ||
440 | /* check version */ | |
196c31b4 | 441 | if (crypto_info->version != TLS_1_2_VERSION) { |
3c4d7559 | 442 | rc = -ENOTSUPP; |
196c31b4 | 443 | goto err_crypto_info; |
3c4d7559 DW |
444 | } |
445 | ||
196c31b4 | 446 | switch (crypto_info->cipher_type) { |
3c4d7559 DW |
447 | case TLS_CIPHER_AES_GCM_128: { |
448 | if (optlen != sizeof(struct tls12_crypto_info_aes_gcm_128)) { | |
449 | rc = -EINVAL; | |
6db959c8 | 450 | goto err_crypto_info; |
3c4d7559 | 451 | } |
196c31b4 IL |
452 | rc = copy_from_user(crypto_info + 1, optval + sizeof(*crypto_info), |
453 | optlen - sizeof(*crypto_info)); | |
3c4d7559 DW |
454 | if (rc) { |
455 | rc = -EFAULT; | |
456 | goto err_crypto_info; | |
457 | } | |
458 | break; | |
459 | } | |
460 | default: | |
461 | rc = -EINVAL; | |
6db959c8 | 462 | goto err_crypto_info; |
3c4d7559 DW |
463 | } |
464 | ||
c46234eb | 465 | if (tx) { |
e8f69799 IL |
466 | #ifdef CONFIG_TLS_DEVICE |
467 | rc = tls_set_device_offload(sk, ctx); | |
468 | conf = TLS_HW; | |
469 | if (rc) { | |
470 | #else | |
471 | { | |
472 | #endif | |
473 | rc = tls_set_sw_offload(sk, ctx, 1); | |
474 | conf = TLS_SW; | |
475 | } | |
c46234eb | 476 | } else { |
4799ac81 BP |
477 | #ifdef CONFIG_TLS_DEVICE |
478 | rc = tls_set_device_offload_rx(sk, ctx); | |
479 | conf = TLS_HW; | |
480 | if (rc) { | |
481 | #else | |
482 | { | |
483 | #endif | |
484 | rc = tls_set_sw_offload(sk, ctx, 0); | |
485 | conf = TLS_SW; | |
486 | } | |
c46234eb DW |
487 | } |
488 | ||
3c4d7559 DW |
489 | if (rc) |
490 | goto err_crypto_info; | |
491 | ||
f66de3ee BP |
492 | if (tx) |
493 | ctx->tx_conf = conf; | |
494 | else | |
495 | ctx->rx_conf = conf; | |
6d88207f | 496 | update_sk_prot(sk, ctx); |
c46234eb DW |
497 | if (tx) { |
498 | ctx->sk_write_space = sk->sk_write_space; | |
499 | sk->sk_write_space = tls_write_space; | |
500 | } else { | |
501 | sk->sk_socket->ops = &tls_sw_proto_ops; | |
502 | } | |
3c4d7559 DW |
503 | goto out; |
504 | ||
505 | err_crypto_info: | |
c844eb46 | 506 | memzero_explicit(crypto_info, sizeof(union tls_crypto_context)); |
3c4d7559 DW |
507 | out: |
508 | return rc; | |
509 | } | |
510 | ||
511 | static int do_tls_setsockopt(struct sock *sk, int optname, | |
512 | char __user *optval, unsigned int optlen) | |
513 | { | |
514 | int rc = 0; | |
515 | ||
516 | switch (optname) { | |
517 | case TLS_TX: | |
c46234eb | 518 | case TLS_RX: |
3c4d7559 | 519 | lock_sock(sk); |
c46234eb DW |
520 | rc = do_tls_setsockopt_conf(sk, optval, optlen, |
521 | optname == TLS_TX); | |
3c4d7559 DW |
522 | release_sock(sk); |
523 | break; | |
524 | default: | |
525 | rc = -ENOPROTOOPT; | |
526 | break; | |
527 | } | |
528 | return rc; | |
529 | } | |
530 | ||
531 | static int tls_setsockopt(struct sock *sk, int level, int optname, | |
532 | char __user *optval, unsigned int optlen) | |
533 | { | |
534 | struct tls_context *ctx = tls_get_ctx(sk); | |
535 | ||
536 | if (level != SOL_TLS) | |
537 | return ctx->setsockopt(sk, level, optname, optval, optlen); | |
538 | ||
539 | return do_tls_setsockopt(sk, optname, optval, optlen); | |
540 | } | |
541 | ||
dd0bed16 AG |
542 | static struct tls_context *create_ctx(struct sock *sk) |
543 | { | |
544 | struct inet_connection_sock *icsk = inet_csk(sk); | |
545 | struct tls_context *ctx; | |
546 | ||
c6ec179a | 547 | ctx = kzalloc(sizeof(*ctx), GFP_ATOMIC); |
dd0bed16 AG |
548 | if (!ctx) |
549 | return NULL; | |
550 | ||
551 | icsk->icsk_ulp_data = ctx; | |
6c0563e4 AG |
552 | ctx->setsockopt = sk->sk_prot->setsockopt; |
553 | ctx->getsockopt = sk->sk_prot->getsockopt; | |
554 | ctx->sk_proto_close = sk->sk_prot->close; | |
dd0bed16 AG |
555 | return ctx; |
556 | } | |
557 | ||
63a6b3fe AG |
558 | static void tls_build_proto(struct sock *sk) |
559 | { | |
560 | int ip_ver = sk->sk_family == AF_INET6 ? TLSV6 : TLSV4; | |
561 | ||
562 | /* Build IPv6 TLS whenever the address of tcpv6 _prot changes */ | |
563 | if (ip_ver == TLSV6 && | |
564 | unlikely(sk->sk_prot != smp_load_acquire(&saved_tcpv6_prot))) { | |
565 | mutex_lock(&tcpv6_prot_mutex); | |
566 | if (likely(sk->sk_prot != saved_tcpv6_prot)) { | |
567 | build_protos(tls_prots[TLSV6], sk->sk_prot); | |
568 | smp_store_release(&saved_tcpv6_prot, sk->sk_prot); | |
569 | } | |
570 | mutex_unlock(&tcpv6_prot_mutex); | |
571 | } | |
572 | ||
573 | if (ip_ver == TLSV4 && | |
574 | unlikely(sk->sk_prot != smp_load_acquire(&saved_tcpv4_prot))) { | |
575 | mutex_lock(&tcpv4_prot_mutex); | |
576 | if (likely(sk->sk_prot != saved_tcpv4_prot)) { | |
577 | build_protos(tls_prots[TLSV4], sk->sk_prot); | |
578 | smp_store_release(&saved_tcpv4_prot, sk->sk_prot); | |
579 | } | |
580 | mutex_unlock(&tcpv4_prot_mutex); | |
581 | } | |
582 | } | |
583 | ||
76f7164d AG |
584 | static void tls_hw_sk_destruct(struct sock *sk) |
585 | { | |
586 | struct tls_context *ctx = tls_get_ctx(sk); | |
587 | struct inet_connection_sock *icsk = inet_csk(sk); | |
588 | ||
589 | ctx->sk_destruct(sk); | |
590 | /* Free ctx */ | |
591 | kfree(ctx); | |
592 | icsk->icsk_ulp_data = NULL; | |
593 | } | |
594 | ||
dd0bed16 AG |
595 | static int tls_hw_prot(struct sock *sk) |
596 | { | |
597 | struct tls_context *ctx; | |
598 | struct tls_device *dev; | |
599 | int rc = 0; | |
600 | ||
df9d4a17 | 601 | spin_lock_bh(&device_spinlock); |
dd0bed16 AG |
602 | list_for_each_entry(dev, &device_list, dev_list) { |
603 | if (dev->feature && dev->feature(dev)) { | |
604 | ctx = create_ctx(sk); | |
605 | if (!ctx) | |
606 | goto out; | |
607 | ||
63a6b3fe AG |
608 | spin_unlock_bh(&device_spinlock); |
609 | tls_build_proto(sk); | |
dd0bed16 AG |
610 | ctx->hash = sk->sk_prot->hash; |
611 | ctx->unhash = sk->sk_prot->unhash; | |
612 | ctx->sk_proto_close = sk->sk_prot->close; | |
76f7164d AG |
613 | ctx->sk_destruct = sk->sk_destruct; |
614 | sk->sk_destruct = tls_hw_sk_destruct; | |
f66de3ee BP |
615 | ctx->rx_conf = TLS_HW_RECORD; |
616 | ctx->tx_conf = TLS_HW_RECORD; | |
dd0bed16 | 617 | update_sk_prot(sk, ctx); |
63a6b3fe | 618 | spin_lock_bh(&device_spinlock); |
dd0bed16 AG |
619 | rc = 1; |
620 | break; | |
621 | } | |
622 | } | |
623 | out: | |
df9d4a17 | 624 | spin_unlock_bh(&device_spinlock); |
dd0bed16 AG |
625 | return rc; |
626 | } | |
627 | ||
628 | static void tls_hw_unhash(struct sock *sk) | |
629 | { | |
630 | struct tls_context *ctx = tls_get_ctx(sk); | |
631 | struct tls_device *dev; | |
632 | ||
df9d4a17 | 633 | spin_lock_bh(&device_spinlock); |
dd0bed16 | 634 | list_for_each_entry(dev, &device_list, dev_list) { |
df9d4a17 AG |
635 | if (dev->unhash) { |
636 | kref_get(&dev->kref); | |
637 | spin_unlock_bh(&device_spinlock); | |
dd0bed16 | 638 | dev->unhash(dev, sk); |
df9d4a17 AG |
639 | kref_put(&dev->kref, dev->release); |
640 | spin_lock_bh(&device_spinlock); | |
641 | } | |
dd0bed16 | 642 | } |
df9d4a17 | 643 | spin_unlock_bh(&device_spinlock); |
dd0bed16 AG |
644 | ctx->unhash(sk); |
645 | } | |
646 | ||
647 | static int tls_hw_hash(struct sock *sk) | |
648 | { | |
649 | struct tls_context *ctx = tls_get_ctx(sk); | |
650 | struct tls_device *dev; | |
651 | int err; | |
652 | ||
653 | err = ctx->hash(sk); | |
df9d4a17 | 654 | spin_lock_bh(&device_spinlock); |
dd0bed16 | 655 | list_for_each_entry(dev, &device_list, dev_list) { |
df9d4a17 AG |
656 | if (dev->hash) { |
657 | kref_get(&dev->kref); | |
658 | spin_unlock_bh(&device_spinlock); | |
dd0bed16 | 659 | err |= dev->hash(dev, sk); |
df9d4a17 AG |
660 | kref_put(&dev->kref, dev->release); |
661 | spin_lock_bh(&device_spinlock); | |
662 | } | |
dd0bed16 | 663 | } |
df9d4a17 | 664 | spin_unlock_bh(&device_spinlock); |
dd0bed16 AG |
665 | |
666 | if (err) | |
667 | tls_hw_unhash(sk); | |
668 | return err; | |
669 | } | |
670 | ||
f66de3ee BP |
671 | static void build_protos(struct proto prot[TLS_NUM_CONFIG][TLS_NUM_CONFIG], |
672 | struct proto *base) | |
c113187d | 673 | { |
f66de3ee BP |
674 | prot[TLS_BASE][TLS_BASE] = *base; |
675 | prot[TLS_BASE][TLS_BASE].setsockopt = tls_setsockopt; | |
676 | prot[TLS_BASE][TLS_BASE].getsockopt = tls_getsockopt; | |
677 | prot[TLS_BASE][TLS_BASE].close = tls_sk_proto_close; | |
678 | ||
679 | prot[TLS_SW][TLS_BASE] = prot[TLS_BASE][TLS_BASE]; | |
680 | prot[TLS_SW][TLS_BASE].sendmsg = tls_sw_sendmsg; | |
681 | prot[TLS_SW][TLS_BASE].sendpage = tls_sw_sendpage; | |
682 | ||
683 | prot[TLS_BASE][TLS_SW] = prot[TLS_BASE][TLS_BASE]; | |
924ad65e JF |
684 | prot[TLS_BASE][TLS_SW].recvmsg = tls_sw_recvmsg; |
685 | prot[TLS_BASE][TLS_SW].stream_memory_read = tls_sw_stream_read; | |
686 | prot[TLS_BASE][TLS_SW].close = tls_sk_proto_close; | |
f66de3ee BP |
687 | |
688 | prot[TLS_SW][TLS_SW] = prot[TLS_SW][TLS_BASE]; | |
924ad65e JF |
689 | prot[TLS_SW][TLS_SW].recvmsg = tls_sw_recvmsg; |
690 | prot[TLS_SW][TLS_SW].stream_memory_read = tls_sw_stream_read; | |
691 | prot[TLS_SW][TLS_SW].close = tls_sk_proto_close; | |
f66de3ee | 692 | |
e8f69799 IL |
693 | #ifdef CONFIG_TLS_DEVICE |
694 | prot[TLS_HW][TLS_BASE] = prot[TLS_BASE][TLS_BASE]; | |
695 | prot[TLS_HW][TLS_BASE].sendmsg = tls_device_sendmsg; | |
696 | prot[TLS_HW][TLS_BASE].sendpage = tls_device_sendpage; | |
697 | ||
698 | prot[TLS_HW][TLS_SW] = prot[TLS_BASE][TLS_SW]; | |
699 | prot[TLS_HW][TLS_SW].sendmsg = tls_device_sendmsg; | |
700 | prot[TLS_HW][TLS_SW].sendpage = tls_device_sendpage; | |
4799ac81 BP |
701 | |
702 | prot[TLS_BASE][TLS_HW] = prot[TLS_BASE][TLS_SW]; | |
703 | ||
704 | prot[TLS_SW][TLS_HW] = prot[TLS_SW][TLS_SW]; | |
705 | ||
706 | prot[TLS_HW][TLS_HW] = prot[TLS_HW][TLS_SW]; | |
e8f69799 IL |
707 | #endif |
708 | ||
f66de3ee BP |
709 | prot[TLS_HW_RECORD][TLS_HW_RECORD] = *base; |
710 | prot[TLS_HW_RECORD][TLS_HW_RECORD].hash = tls_hw_hash; | |
711 | prot[TLS_HW_RECORD][TLS_HW_RECORD].unhash = tls_hw_unhash; | |
712 | prot[TLS_HW_RECORD][TLS_HW_RECORD].close = tls_sk_proto_close; | |
c113187d BP |
713 | } |
714 | ||
3c4d7559 DW |
715 | static int tls_init(struct sock *sk) |
716 | { | |
3c4d7559 DW |
717 | struct tls_context *ctx; |
718 | int rc = 0; | |
719 | ||
dd0bed16 AG |
720 | if (tls_hw_prot(sk)) |
721 | goto out; | |
722 | ||
d91c3e17 IL |
723 | /* The TLS ulp is currently supported only for TCP sockets |
724 | * in ESTABLISHED state. | |
725 | * Supporting sockets in LISTEN state will require us | |
726 | * to modify the accept implementation to clone rather then | |
727 | * share the ulp context. | |
728 | */ | |
729 | if (sk->sk_state != TCP_ESTABLISHED) | |
730 | return -ENOTSUPP; | |
731 | ||
3c4d7559 | 732 | /* allocate tls context */ |
dd0bed16 | 733 | ctx = create_ctx(sk); |
3c4d7559 DW |
734 | if (!ctx) { |
735 | rc = -ENOMEM; | |
736 | goto out; | |
737 | } | |
6d88207f | 738 | |
63a6b3fe | 739 | tls_build_proto(sk); |
f66de3ee BP |
740 | ctx->tx_conf = TLS_BASE; |
741 | ctx->rx_conf = TLS_BASE; | |
6d88207f | 742 | update_sk_prot(sk, ctx); |
3c4d7559 DW |
743 | out: |
744 | return rc; | |
745 | } | |
746 | ||
dd0bed16 AG |
747 | void tls_register_device(struct tls_device *device) |
748 | { | |
df9d4a17 | 749 | spin_lock_bh(&device_spinlock); |
dd0bed16 | 750 | list_add_tail(&device->dev_list, &device_list); |
df9d4a17 | 751 | spin_unlock_bh(&device_spinlock); |
dd0bed16 AG |
752 | } |
753 | EXPORT_SYMBOL(tls_register_device); | |
754 | ||
755 | void tls_unregister_device(struct tls_device *device) | |
756 | { | |
df9d4a17 | 757 | spin_lock_bh(&device_spinlock); |
dd0bed16 | 758 | list_del(&device->dev_list); |
df9d4a17 | 759 | spin_unlock_bh(&device_spinlock); |
dd0bed16 AG |
760 | } |
761 | EXPORT_SYMBOL(tls_unregister_device); | |
762 | ||
3c4d7559 DW |
763 | static struct tcp_ulp_ops tcp_tls_ulp_ops __read_mostly = { |
764 | .name = "tls", | |
765 | .owner = THIS_MODULE, | |
766 | .init = tls_init, | |
767 | }; | |
768 | ||
769 | static int __init tls_register(void) | |
770 | { | |
c46234eb | 771 | tls_sw_proto_ops = inet_stream_ops; |
c46234eb DW |
772 | tls_sw_proto_ops.splice_read = tls_sw_splice_read; |
773 | ||
e8f69799 IL |
774 | #ifdef CONFIG_TLS_DEVICE |
775 | tls_device_init(); | |
776 | #endif | |
3c4d7559 DW |
777 | tcp_register_ulp(&tcp_tls_ulp_ops); |
778 | ||
779 | return 0; | |
780 | } | |
781 | ||
782 | static void __exit tls_unregister(void) | |
783 | { | |
784 | tcp_unregister_ulp(&tcp_tls_ulp_ops); | |
e8f69799 IL |
785 | #ifdef CONFIG_TLS_DEVICE |
786 | tls_device_cleanup(); | |
787 | #endif | |
3c4d7559 DW |
788 | } |
789 | ||
790 | module_init(tls_register); | |
791 | module_exit(tls_unregister); |