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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> |
26811cc9 | 42 | #include <linux/inet_diag.h> |
3c4d7559 | 43 | |
d26b698d | 44 | #include <net/snmp.h> |
3c4d7559 | 45 | #include <net/tls.h> |
25a3cd81 | 46 | #include <net/tls_toe.h> |
3c4d7559 DW |
47 | |
48 | MODULE_AUTHOR("Mellanox Technologies"); | |
49 | MODULE_DESCRIPTION("Transport Layer Security Support"); | |
50 | MODULE_LICENSE("Dual BSD/GPL"); | |
037b0b86 | 51 | MODULE_ALIAS_TCP_ULP("tls"); |
3c4d7559 | 52 | |
c113187d BP |
53 | enum { |
54 | TLSV4, | |
55 | TLSV6, | |
56 | TLS_NUM_PROTS, | |
57 | }; | |
6d88207f | 58 | |
f691a25c | 59 | static const struct proto *saved_tcpv6_prot; |
c113187d | 60 | static DEFINE_MUTEX(tcpv6_prot_mutex); |
f691a25c | 61 | static const struct proto *saved_tcpv4_prot; |
28cb6f1e | 62 | static DEFINE_MUTEX(tcpv4_prot_mutex); |
f66de3ee | 63 | static struct proto tls_prots[TLS_NUM_PROTS][TLS_NUM_CONFIG][TLS_NUM_CONFIG]; |
c46234eb | 64 | static struct proto_ops tls_sw_proto_ops; |
63a6b3fe | 65 | static void build_protos(struct proto prot[TLS_NUM_CONFIG][TLS_NUM_CONFIG], |
f13fe3e6 | 66 | const struct proto *base); |
6d88207f | 67 | |
08700dab | 68 | void update_sk_prot(struct sock *sk, struct tls_context *ctx) |
6d88207f | 69 | { |
c113187d BP |
70 | int ip_ver = sk->sk_family == AF_INET6 ? TLSV6 : TLSV4; |
71 | ||
d5bee737 JS |
72 | WRITE_ONCE(sk->sk_prot, |
73 | &tls_prots[ip_ver][ctx->tx_conf][ctx->rx_conf]); | |
6d88207f | 74 | } |
3c4d7559 DW |
75 | |
76 | int wait_on_pending_writer(struct sock *sk, long *timeo) | |
77 | { | |
78 | int rc = 0; | |
79 | DEFINE_WAIT_FUNC(wait, woken_wake_function); | |
80 | ||
81 | add_wait_queue(sk_sleep(sk), &wait); | |
82 | while (1) { | |
83 | if (!*timeo) { | |
84 | rc = -EAGAIN; | |
85 | break; | |
86 | } | |
87 | ||
88 | if (signal_pending(current)) { | |
89 | rc = sock_intr_errno(*timeo); | |
90 | break; | |
91 | } | |
92 | ||
93 | if (sk_wait_event(sk, timeo, !sk->sk_write_pending, &wait)) | |
94 | break; | |
95 | } | |
96 | remove_wait_queue(sk_sleep(sk), &wait); | |
97 | return rc; | |
98 | } | |
99 | ||
100 | int tls_push_sg(struct sock *sk, | |
101 | struct tls_context *ctx, | |
102 | struct scatterlist *sg, | |
103 | u16 first_offset, | |
104 | int flags) | |
105 | { | |
106 | int sendpage_flags = flags | MSG_SENDPAGE_NOTLAST; | |
107 | int ret = 0; | |
108 | struct page *p; | |
109 | size_t size; | |
110 | int offset = first_offset; | |
111 | ||
112 | size = sg->length - offset; | |
113 | offset += sg->offset; | |
114 | ||
c212d2c7 | 115 | ctx->in_tcp_sendpages = true; |
3c4d7559 DW |
116 | while (1) { |
117 | if (sg_is_last(sg)) | |
118 | sendpage_flags = flags; | |
119 | ||
120 | /* is sending application-limited? */ | |
121 | tcp_rate_check_app_limited(sk); | |
122 | p = sg_page(sg); | |
123 | retry: | |
124 | ret = do_tcp_sendpages(sk, p, offset, size, sendpage_flags); | |
125 | ||
126 | if (ret != size) { | |
127 | if (ret > 0) { | |
128 | offset += ret; | |
129 | size -= ret; | |
130 | goto retry; | |
131 | } | |
132 | ||
133 | offset -= sg->offset; | |
134 | ctx->partially_sent_offset = offset; | |
135 | ctx->partially_sent_record = (void *)sg; | |
080324c3 | 136 | ctx->in_tcp_sendpages = false; |
3c4d7559 DW |
137 | return ret; |
138 | } | |
139 | ||
140 | put_page(p); | |
141 | sk_mem_uncharge(sk, sg->length); | |
142 | sg = sg_next(sg); | |
143 | if (!sg) | |
144 | break; | |
145 | ||
146 | offset = sg->offset; | |
147 | size = sg->length; | |
148 | } | |
149 | ||
c212d2c7 | 150 | ctx->in_tcp_sendpages = false; |
3c4d7559 DW |
151 | |
152 | return 0; | |
153 | } | |
154 | ||
155 | static int tls_handle_open_record(struct sock *sk, int flags) | |
156 | { | |
157 | struct tls_context *ctx = tls_get_ctx(sk); | |
158 | ||
159 | if (tls_is_pending_open_record(ctx)) | |
160 | return ctx->push_pending_record(sk, flags); | |
161 | ||
162 | return 0; | |
163 | } | |
164 | ||
165 | int tls_proccess_cmsg(struct sock *sk, struct msghdr *msg, | |
166 | unsigned char *record_type) | |
167 | { | |
168 | struct cmsghdr *cmsg; | |
169 | int rc = -EINVAL; | |
170 | ||
171 | for_each_cmsghdr(cmsg, msg) { | |
172 | if (!CMSG_OK(msg, cmsg)) | |
173 | return -EINVAL; | |
174 | if (cmsg->cmsg_level != SOL_TLS) | |
175 | continue; | |
176 | ||
177 | switch (cmsg->cmsg_type) { | |
178 | case TLS_SET_RECORD_TYPE: | |
179 | if (cmsg->cmsg_len < CMSG_LEN(sizeof(*record_type))) | |
180 | return -EINVAL; | |
181 | ||
182 | if (msg->msg_flags & MSG_MORE) | |
183 | return -EINVAL; | |
184 | ||
185 | rc = tls_handle_open_record(sk, msg->msg_flags); | |
186 | if (rc) | |
187 | return rc; | |
188 | ||
189 | *record_type = *(unsigned char *)CMSG_DATA(cmsg); | |
190 | rc = 0; | |
191 | break; | |
192 | default: | |
193 | return -EINVAL; | |
194 | } | |
195 | } | |
196 | ||
197 | return rc; | |
198 | } | |
199 | ||
a42055e8 VG |
200 | int tls_push_partial_record(struct sock *sk, struct tls_context *ctx, |
201 | int flags) | |
3c4d7559 DW |
202 | { |
203 | struct scatterlist *sg; | |
204 | u16 offset; | |
205 | ||
3c4d7559 DW |
206 | sg = ctx->partially_sent_record; |
207 | offset = ctx->partially_sent_offset; | |
208 | ||
209 | ctx->partially_sent_record = NULL; | |
210 | return tls_push_sg(sk, ctx, sg, offset, flags); | |
211 | } | |
212 | ||
c5daa6cc | 213 | void tls_free_partial_record(struct sock *sk, struct tls_context *ctx) |
35b71a34 JK |
214 | { |
215 | struct scatterlist *sg; | |
216 | ||
c5daa6cc | 217 | for (sg = ctx->partially_sent_record; sg; sg = sg_next(sg)) { |
35b71a34 JK |
218 | put_page(sg_page(sg)); |
219 | sk_mem_uncharge(sk, sg->length); | |
35b71a34 JK |
220 | } |
221 | ctx->partially_sent_record = NULL; | |
35b71a34 JK |
222 | } |
223 | ||
3c4d7559 DW |
224 | static void tls_write_space(struct sock *sk) |
225 | { | |
226 | struct tls_context *ctx = tls_get_ctx(sk); | |
227 | ||
67db7cd2 JF |
228 | /* If in_tcp_sendpages call lower protocol write space handler |
229 | * to ensure we wake up any waiting operations there. For example | |
230 | * if do_tcp_sendpages where to call sk_wait_event. | |
231 | */ | |
232 | if (ctx->in_tcp_sendpages) { | |
233 | ctx->sk_write_space(sk); | |
c212d2c7 | 234 | return; |
67db7cd2 | 235 | } |
c212d2c7 | 236 | |
7463d3a2 BP |
237 | #ifdef CONFIG_TLS_DEVICE |
238 | if (ctx->tx_conf == TLS_HW) | |
239 | tls_device_write_space(sk, ctx); | |
240 | else | |
241 | #endif | |
242 | tls_sw_write_space(sk, ctx); | |
4504ab0e VG |
243 | |
244 | ctx->sk_write_space(sk); | |
3c4d7559 DW |
245 | } |
246 | ||
15a7dea7 JK |
247 | /** |
248 | * tls_ctx_free() - free TLS ULP context | |
249 | * @sk: socket to with @ctx is attached | |
250 | * @ctx: TLS context structure | |
251 | * | |
252 | * Free TLS context. If @sk is %NULL caller guarantees that the socket | |
253 | * to which @ctx was attached has no outstanding references. | |
254 | */ | |
255 | void tls_ctx_free(struct sock *sk, struct tls_context *ctx) | |
86029d10 SD |
256 | { |
257 | if (!ctx) | |
258 | return; | |
259 | ||
260 | memzero_explicit(&ctx->crypto_send, sizeof(ctx->crypto_send)); | |
261 | memzero_explicit(&ctx->crypto_recv, sizeof(ctx->crypto_recv)); | |
79ffe608 | 262 | mutex_destroy(&ctx->tx_lock); |
15a7dea7 JK |
263 | |
264 | if (sk) | |
265 | kfree_rcu(ctx, rcu); | |
266 | else | |
267 | kfree(ctx); | |
86029d10 SD |
268 | } |
269 | ||
313ab004 JF |
270 | static void tls_sk_proto_cleanup(struct sock *sk, |
271 | struct tls_context *ctx, long timeo) | |
3c4d7559 | 272 | { |
9354544c DM |
273 | if (unlikely(sk->sk_write_pending) && |
274 | !wait_on_pending_writer(sk, &timeo)) | |
3c4d7559 DW |
275 | tls_handle_open_record(sk, 0); |
276 | ||
f66de3ee BP |
277 | /* We need these for tls_sw_fallback handling of other packets */ |
278 | if (ctx->tx_conf == TLS_SW) { | |
279 | kfree(ctx->tx.rec_seq); | |
280 | kfree(ctx->tx.iv); | |
313ab004 | 281 | tls_sw_release_resources_tx(sk); |
b32fd3cc | 282 | TLS_DEC_STATS(sock_net(sk), LINUX_MIB_TLSCURRTXSW); |
35b71a34 JK |
283 | } else if (ctx->tx_conf == TLS_HW) { |
284 | tls_device_free_resources_tx(sk); | |
b32fd3cc | 285 | TLS_DEC_STATS(sock_net(sk), LINUX_MIB_TLSCURRTXDEVICE); |
f66de3ee | 286 | } |
3c4d7559 | 287 | |
b32fd3cc | 288 | if (ctx->rx_conf == TLS_SW) { |
313ab004 | 289 | tls_sw_release_resources_rx(sk); |
b32fd3cc JK |
290 | TLS_DEC_STATS(sock_net(sk), LINUX_MIB_TLSCURRRXSW); |
291 | } else if (ctx->rx_conf == TLS_HW) { | |
4799ac81 | 292 | tls_device_offload_cleanup_rx(sk); |
b32fd3cc JK |
293 | TLS_DEC_STATS(sock_net(sk), LINUX_MIB_TLSCURRRXDEVICE); |
294 | } | |
313ab004 JF |
295 | } |
296 | ||
297 | static void tls_sk_proto_close(struct sock *sk, long timeout) | |
298 | { | |
95fa1454 | 299 | struct inet_connection_sock *icsk = inet_csk(sk); |
313ab004 JF |
300 | struct tls_context *ctx = tls_get_ctx(sk); |
301 | long timeo = sock_sndtimeo(sk, 0); | |
302 | bool free_ctx; | |
303 | ||
304 | if (ctx->tx_conf == TLS_SW) | |
305 | tls_sw_cancel_work_tx(ctx); | |
306 | ||
307 | lock_sock(sk); | |
308 | free_ctx = ctx->tx_conf != TLS_HW && ctx->rx_conf != TLS_HW; | |
313ab004 JF |
309 | |
310 | if (ctx->tx_conf != TLS_BASE || ctx->rx_conf != TLS_BASE) | |
311 | tls_sk_proto_cleanup(sk, ctx, timeo); | |
e8f69799 | 312 | |
95fa1454 JF |
313 | write_lock_bh(&sk->sk_callback_lock); |
314 | if (free_ctx) | |
15a7dea7 | 315 | rcu_assign_pointer(icsk->icsk_ulp_data, NULL); |
d5bee737 | 316 | WRITE_ONCE(sk->sk_prot, ctx->sk_proto); |
d85f0177 JF |
317 | if (sk->sk_write_space == tls_write_space) |
318 | sk->sk_write_space = ctx->sk_write_space; | |
95fa1454 | 319 | write_unlock_bh(&sk->sk_callback_lock); |
3c4d7559 | 320 | release_sock(sk); |
313ab004 JF |
321 | if (ctx->tx_conf == TLS_SW) |
322 | tls_sw_free_ctx_tx(ctx); | |
323 | if (ctx->rx_conf == TLS_SW || ctx->rx_conf == TLS_HW) | |
324 | tls_sw_strparser_done(ctx); | |
325 | if (ctx->rx_conf == TLS_SW) | |
326 | tls_sw_free_ctx_rx(ctx); | |
be7bbea1 | 327 | ctx->sk_proto->close(sk, timeout); |
313ab004 | 328 | |
98f0a395 | 329 | if (free_ctx) |
15a7dea7 | 330 | tls_ctx_free(sk, ctx); |
3c4d7559 DW |
331 | } |
332 | ||
ffa81fa4 YH |
333 | static int do_tls_getsockopt_conf(struct sock *sk, char __user *optval, |
334 | int __user *optlen, int tx) | |
3c4d7559 DW |
335 | { |
336 | int rc = 0; | |
337 | struct tls_context *ctx = tls_get_ctx(sk); | |
338 | struct tls_crypto_info *crypto_info; | |
ffa81fa4 | 339 | struct cipher_context *cctx; |
3c4d7559 DW |
340 | int len; |
341 | ||
342 | if (get_user(len, optlen)) | |
343 | return -EFAULT; | |
344 | ||
345 | if (!optval || (len < sizeof(*crypto_info))) { | |
346 | rc = -EINVAL; | |
347 | goto out; | |
348 | } | |
349 | ||
350 | if (!ctx) { | |
351 | rc = -EBUSY; | |
352 | goto out; | |
353 | } | |
354 | ||
355 | /* get user crypto info */ | |
ffa81fa4 YH |
356 | if (tx) { |
357 | crypto_info = &ctx->crypto_send.info; | |
358 | cctx = &ctx->tx; | |
359 | } else { | |
360 | crypto_info = &ctx->crypto_recv.info; | |
361 | cctx = &ctx->rx; | |
362 | } | |
3c4d7559 DW |
363 | |
364 | if (!TLS_CRYPTO_INFO_READY(crypto_info)) { | |
365 | rc = -EBUSY; | |
366 | goto out; | |
367 | } | |
368 | ||
5a3b886c | 369 | if (len == sizeof(*crypto_info)) { |
ac55cd61 DC |
370 | if (copy_to_user(optval, crypto_info, sizeof(*crypto_info))) |
371 | rc = -EFAULT; | |
3c4d7559 DW |
372 | goto out; |
373 | } | |
374 | ||
375 | switch (crypto_info->cipher_type) { | |
376 | case TLS_CIPHER_AES_GCM_128: { | |
377 | struct tls12_crypto_info_aes_gcm_128 * | |
378 | crypto_info_aes_gcm_128 = | |
379 | container_of(crypto_info, | |
380 | struct tls12_crypto_info_aes_gcm_128, | |
381 | info); | |
382 | ||
383 | if (len != sizeof(*crypto_info_aes_gcm_128)) { | |
384 | rc = -EINVAL; | |
385 | goto out; | |
386 | } | |
387 | lock_sock(sk); | |
a1dfa681 | 388 | memcpy(crypto_info_aes_gcm_128->iv, |
ffa81fa4 | 389 | cctx->iv + TLS_CIPHER_AES_GCM_128_SALT_SIZE, |
3c4d7559 | 390 | TLS_CIPHER_AES_GCM_128_IV_SIZE); |
ffa81fa4 | 391 | memcpy(crypto_info_aes_gcm_128->rec_seq, cctx->rec_seq, |
c410c196 | 392 | TLS_CIPHER_AES_GCM_128_REC_SEQ_SIZE); |
3c4d7559 | 393 | release_sock(sk); |
ac55cd61 DC |
394 | if (copy_to_user(optval, |
395 | crypto_info_aes_gcm_128, | |
396 | sizeof(*crypto_info_aes_gcm_128))) | |
397 | rc = -EFAULT; | |
3c4d7559 DW |
398 | break; |
399 | } | |
fb99bce7 DW |
400 | case TLS_CIPHER_AES_GCM_256: { |
401 | struct tls12_crypto_info_aes_gcm_256 * | |
402 | crypto_info_aes_gcm_256 = | |
403 | container_of(crypto_info, | |
404 | struct tls12_crypto_info_aes_gcm_256, | |
405 | info); | |
406 | ||
407 | if (len != sizeof(*crypto_info_aes_gcm_256)) { | |
408 | rc = -EINVAL; | |
409 | goto out; | |
410 | } | |
411 | lock_sock(sk); | |
412 | memcpy(crypto_info_aes_gcm_256->iv, | |
ffa81fa4 | 413 | cctx->iv + TLS_CIPHER_AES_GCM_256_SALT_SIZE, |
fb99bce7 | 414 | TLS_CIPHER_AES_GCM_256_IV_SIZE); |
ffa81fa4 | 415 | memcpy(crypto_info_aes_gcm_256->rec_seq, cctx->rec_seq, |
fb99bce7 DW |
416 | TLS_CIPHER_AES_GCM_256_REC_SEQ_SIZE); |
417 | release_sock(sk); | |
418 | if (copy_to_user(optval, | |
419 | crypto_info_aes_gcm_256, | |
420 | sizeof(*crypto_info_aes_gcm_256))) | |
421 | rc = -EFAULT; | |
422 | break; | |
423 | } | |
3c4d7559 DW |
424 | default: |
425 | rc = -EINVAL; | |
426 | } | |
427 | ||
428 | out: | |
429 | return rc; | |
430 | } | |
431 | ||
432 | static int do_tls_getsockopt(struct sock *sk, int optname, | |
433 | char __user *optval, int __user *optlen) | |
434 | { | |
435 | int rc = 0; | |
436 | ||
437 | switch (optname) { | |
438 | case TLS_TX: | |
ffa81fa4 YH |
439 | case TLS_RX: |
440 | rc = do_tls_getsockopt_conf(sk, optval, optlen, | |
441 | optname == TLS_TX); | |
3c4d7559 DW |
442 | break; |
443 | default: | |
444 | rc = -ENOPROTOOPT; | |
445 | break; | |
446 | } | |
447 | return rc; | |
448 | } | |
449 | ||
450 | static int tls_getsockopt(struct sock *sk, int level, int optname, | |
451 | char __user *optval, int __user *optlen) | |
452 | { | |
453 | struct tls_context *ctx = tls_get_ctx(sk); | |
454 | ||
455 | if (level != SOL_TLS) | |
be7bbea1 JK |
456 | return ctx->sk_proto->getsockopt(sk, level, |
457 | optname, optval, optlen); | |
3c4d7559 DW |
458 | |
459 | return do_tls_getsockopt(sk, optname, optval, optlen); | |
460 | } | |
461 | ||
a7b75c5a | 462 | static int do_tls_setsockopt_conf(struct sock *sk, sockptr_t optval, |
c46234eb | 463 | unsigned int optlen, int tx) |
3c4d7559 | 464 | { |
196c31b4 | 465 | struct tls_crypto_info *crypto_info; |
4509de14 | 466 | struct tls_crypto_info *alt_crypto_info; |
3c4d7559 | 467 | struct tls_context *ctx = tls_get_ctx(sk); |
fb99bce7 | 468 | size_t optsize; |
3c4d7559 | 469 | int rc = 0; |
58371585 | 470 | int conf; |
3c4d7559 | 471 | |
a7b75c5a | 472 | if (sockptr_is_null(optval) || (optlen < sizeof(*crypto_info))) { |
3c4d7559 DW |
473 | rc = -EINVAL; |
474 | goto out; | |
475 | } | |
476 | ||
4509de14 | 477 | if (tx) { |
86029d10 | 478 | crypto_info = &ctx->crypto_send.info; |
4509de14 VG |
479 | alt_crypto_info = &ctx->crypto_recv.info; |
480 | } else { | |
86029d10 | 481 | crypto_info = &ctx->crypto_recv.info; |
4509de14 VG |
482 | alt_crypto_info = &ctx->crypto_send.info; |
483 | } | |
c46234eb | 484 | |
196c31b4 | 485 | /* Currently we don't support set crypto info more than one time */ |
877d17c7 SD |
486 | if (TLS_CRYPTO_INFO_READY(crypto_info)) { |
487 | rc = -EBUSY; | |
196c31b4 | 488 | goto out; |
877d17c7 | 489 | } |
196c31b4 | 490 | |
a7b75c5a | 491 | rc = copy_from_sockptr(crypto_info, optval, sizeof(*crypto_info)); |
3c4d7559 DW |
492 | if (rc) { |
493 | rc = -EFAULT; | |
257082e6 | 494 | goto err_crypto_info; |
3c4d7559 DW |
495 | } |
496 | ||
497 | /* check version */ | |
130b392c DW |
498 | if (crypto_info->version != TLS_1_2_VERSION && |
499 | crypto_info->version != TLS_1_3_VERSION) { | |
4a5cdc60 | 500 | rc = -EINVAL; |
196c31b4 | 501 | goto err_crypto_info; |
3c4d7559 DW |
502 | } |
503 | ||
4509de14 VG |
504 | /* Ensure that TLS version and ciphers are same in both directions */ |
505 | if (TLS_CRYPTO_INFO_READY(alt_crypto_info)) { | |
506 | if (alt_crypto_info->version != crypto_info->version || | |
507 | alt_crypto_info->cipher_type != crypto_info->cipher_type) { | |
508 | rc = -EINVAL; | |
509 | goto err_crypto_info; | |
510 | } | |
511 | } | |
512 | ||
196c31b4 | 513 | switch (crypto_info->cipher_type) { |
fb99bce7 | 514 | case TLS_CIPHER_AES_GCM_128: |
f295b3ae VG |
515 | optsize = sizeof(struct tls12_crypto_info_aes_gcm_128); |
516 | break; | |
fb99bce7 | 517 | case TLS_CIPHER_AES_GCM_256: { |
f295b3ae | 518 | optsize = sizeof(struct tls12_crypto_info_aes_gcm_256); |
3c4d7559 DW |
519 | break; |
520 | } | |
f295b3ae VG |
521 | case TLS_CIPHER_AES_CCM_128: |
522 | optsize = sizeof(struct tls12_crypto_info_aes_ccm_128); | |
523 | break; | |
74ea6106 VF |
524 | case TLS_CIPHER_CHACHA20_POLY1305: |
525 | optsize = sizeof(struct tls12_crypto_info_chacha20_poly1305); | |
526 | break; | |
3c4d7559 DW |
527 | default: |
528 | rc = -EINVAL; | |
6db959c8 | 529 | goto err_crypto_info; |
3c4d7559 DW |
530 | } |
531 | ||
f295b3ae VG |
532 | if (optlen != optsize) { |
533 | rc = -EINVAL; | |
534 | goto err_crypto_info; | |
535 | } | |
536 | ||
d3c48151 CH |
537 | rc = copy_from_sockptr_offset(crypto_info + 1, optval, |
538 | sizeof(*crypto_info), | |
539 | optlen - sizeof(*crypto_info)); | |
f295b3ae VG |
540 | if (rc) { |
541 | rc = -EFAULT; | |
542 | goto err_crypto_info; | |
543 | } | |
544 | ||
c46234eb | 545 | if (tx) { |
e8f69799 IL |
546 | rc = tls_set_device_offload(sk, ctx); |
547 | conf = TLS_HW; | |
b32fd3cc JK |
548 | if (!rc) { |
549 | TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSTXDEVICE); | |
550 | TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSCURRTXDEVICE); | |
551 | } else { | |
e8f69799 | 552 | rc = tls_set_sw_offload(sk, ctx, 1); |
318892ac JK |
553 | if (rc) |
554 | goto err_crypto_info; | |
b32fd3cc JK |
555 | TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSTXSW); |
556 | TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSCURRTXSW); | |
e8f69799 IL |
557 | conf = TLS_SW; |
558 | } | |
c46234eb | 559 | } else { |
4799ac81 BP |
560 | rc = tls_set_device_offload_rx(sk, ctx); |
561 | conf = TLS_HW; | |
b32fd3cc JK |
562 | if (!rc) { |
563 | TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSRXDEVICE); | |
564 | TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSCURRRXDEVICE); | |
565 | } else { | |
4799ac81 | 566 | rc = tls_set_sw_offload(sk, ctx, 0); |
318892ac JK |
567 | if (rc) |
568 | goto err_crypto_info; | |
b32fd3cc JK |
569 | TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSRXSW); |
570 | TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSCURRRXSW); | |
4799ac81 BP |
571 | conf = TLS_SW; |
572 | } | |
313ab004 | 573 | tls_sw_strparser_arm(sk, ctx); |
c46234eb DW |
574 | } |
575 | ||
f66de3ee BP |
576 | if (tx) |
577 | ctx->tx_conf = conf; | |
578 | else | |
579 | ctx->rx_conf = conf; | |
6d88207f | 580 | update_sk_prot(sk, ctx); |
c46234eb DW |
581 | if (tx) { |
582 | ctx->sk_write_space = sk->sk_write_space; | |
583 | sk->sk_write_space = tls_write_space; | |
584 | } else { | |
585 | sk->sk_socket->ops = &tls_sw_proto_ops; | |
586 | } | |
3c4d7559 DW |
587 | goto out; |
588 | ||
589 | err_crypto_info: | |
c844eb46 | 590 | memzero_explicit(crypto_info, sizeof(union tls_crypto_context)); |
3c4d7559 DW |
591 | out: |
592 | return rc; | |
593 | } | |
594 | ||
a7b75c5a CH |
595 | static int do_tls_setsockopt(struct sock *sk, int optname, sockptr_t optval, |
596 | unsigned int optlen) | |
3c4d7559 DW |
597 | { |
598 | int rc = 0; | |
599 | ||
600 | switch (optname) { | |
601 | case TLS_TX: | |
c46234eb | 602 | case TLS_RX: |
3c4d7559 | 603 | lock_sock(sk); |
c46234eb DW |
604 | rc = do_tls_setsockopt_conf(sk, optval, optlen, |
605 | optname == TLS_TX); | |
3c4d7559 DW |
606 | release_sock(sk); |
607 | break; | |
608 | default: | |
609 | rc = -ENOPROTOOPT; | |
610 | break; | |
611 | } | |
612 | return rc; | |
613 | } | |
614 | ||
615 | static int tls_setsockopt(struct sock *sk, int level, int optname, | |
a7b75c5a | 616 | sockptr_t optval, unsigned int optlen) |
3c4d7559 DW |
617 | { |
618 | struct tls_context *ctx = tls_get_ctx(sk); | |
619 | ||
620 | if (level != SOL_TLS) | |
be7bbea1 JK |
621 | return ctx->sk_proto->setsockopt(sk, level, optname, optval, |
622 | optlen); | |
3c4d7559 DW |
623 | |
624 | return do_tls_setsockopt(sk, optname, optval, optlen); | |
625 | } | |
626 | ||
08700dab | 627 | struct tls_context *tls_ctx_create(struct sock *sk) |
dd0bed16 AG |
628 | { |
629 | struct inet_connection_sock *icsk = inet_csk(sk); | |
630 | struct tls_context *ctx; | |
631 | ||
c6ec179a | 632 | ctx = kzalloc(sizeof(*ctx), GFP_ATOMIC); |
dd0bed16 AG |
633 | if (!ctx) |
634 | return NULL; | |
635 | ||
79ffe608 | 636 | mutex_init(&ctx->tx_lock); |
15a7dea7 | 637 | rcu_assign_pointer(icsk->icsk_ulp_data, ctx); |
d5bee737 | 638 | ctx->sk_proto = READ_ONCE(sk->sk_prot); |
dd0bed16 AG |
639 | return ctx; |
640 | } | |
641 | ||
63a6b3fe AG |
642 | static void tls_build_proto(struct sock *sk) |
643 | { | |
644 | int ip_ver = sk->sk_family == AF_INET6 ? TLSV6 : TLSV4; | |
9a893949 | 645 | struct proto *prot = READ_ONCE(sk->sk_prot); |
63a6b3fe AG |
646 | |
647 | /* Build IPv6 TLS whenever the address of tcpv6 _prot changes */ | |
648 | if (ip_ver == TLSV6 && | |
5bb4c45d | 649 | unlikely(prot != smp_load_acquire(&saved_tcpv6_prot))) { |
63a6b3fe | 650 | mutex_lock(&tcpv6_prot_mutex); |
5bb4c45d JS |
651 | if (likely(prot != saved_tcpv6_prot)) { |
652 | build_protos(tls_prots[TLSV6], prot); | |
653 | smp_store_release(&saved_tcpv6_prot, prot); | |
63a6b3fe AG |
654 | } |
655 | mutex_unlock(&tcpv6_prot_mutex); | |
656 | } | |
657 | ||
658 | if (ip_ver == TLSV4 && | |
5bb4c45d | 659 | unlikely(prot != smp_load_acquire(&saved_tcpv4_prot))) { |
63a6b3fe | 660 | mutex_lock(&tcpv4_prot_mutex); |
5bb4c45d JS |
661 | if (likely(prot != saved_tcpv4_prot)) { |
662 | build_protos(tls_prots[TLSV4], prot); | |
663 | smp_store_release(&saved_tcpv4_prot, prot); | |
63a6b3fe AG |
664 | } |
665 | mutex_unlock(&tcpv4_prot_mutex); | |
666 | } | |
667 | } | |
668 | ||
f66de3ee | 669 | static void build_protos(struct proto prot[TLS_NUM_CONFIG][TLS_NUM_CONFIG], |
f13fe3e6 | 670 | const struct proto *base) |
c113187d | 671 | { |
f66de3ee BP |
672 | prot[TLS_BASE][TLS_BASE] = *base; |
673 | prot[TLS_BASE][TLS_BASE].setsockopt = tls_setsockopt; | |
674 | prot[TLS_BASE][TLS_BASE].getsockopt = tls_getsockopt; | |
675 | prot[TLS_BASE][TLS_BASE].close = tls_sk_proto_close; | |
676 | ||
677 | prot[TLS_SW][TLS_BASE] = prot[TLS_BASE][TLS_BASE]; | |
678 | prot[TLS_SW][TLS_BASE].sendmsg = tls_sw_sendmsg; | |
679 | prot[TLS_SW][TLS_BASE].sendpage = tls_sw_sendpage; | |
680 | ||
681 | prot[TLS_BASE][TLS_SW] = prot[TLS_BASE][TLS_BASE]; | |
924ad65e JF |
682 | prot[TLS_BASE][TLS_SW].recvmsg = tls_sw_recvmsg; |
683 | prot[TLS_BASE][TLS_SW].stream_memory_read = tls_sw_stream_read; | |
684 | prot[TLS_BASE][TLS_SW].close = tls_sk_proto_close; | |
f66de3ee BP |
685 | |
686 | prot[TLS_SW][TLS_SW] = prot[TLS_SW][TLS_BASE]; | |
924ad65e JF |
687 | prot[TLS_SW][TLS_SW].recvmsg = tls_sw_recvmsg; |
688 | prot[TLS_SW][TLS_SW].stream_memory_read = tls_sw_stream_read; | |
689 | prot[TLS_SW][TLS_SW].close = tls_sk_proto_close; | |
f66de3ee | 690 | |
e8f69799 IL |
691 | #ifdef CONFIG_TLS_DEVICE |
692 | prot[TLS_HW][TLS_BASE] = prot[TLS_BASE][TLS_BASE]; | |
693 | prot[TLS_HW][TLS_BASE].sendmsg = tls_device_sendmsg; | |
694 | prot[TLS_HW][TLS_BASE].sendpage = tls_device_sendpage; | |
695 | ||
696 | prot[TLS_HW][TLS_SW] = prot[TLS_BASE][TLS_SW]; | |
697 | prot[TLS_HW][TLS_SW].sendmsg = tls_device_sendmsg; | |
698 | prot[TLS_HW][TLS_SW].sendpage = tls_device_sendpage; | |
4799ac81 BP |
699 | |
700 | prot[TLS_BASE][TLS_HW] = prot[TLS_BASE][TLS_SW]; | |
701 | ||
702 | prot[TLS_SW][TLS_HW] = prot[TLS_SW][TLS_SW]; | |
703 | ||
704 | prot[TLS_HW][TLS_HW] = prot[TLS_HW][TLS_SW]; | |
e8f69799 | 705 | #endif |
53b4414a | 706 | #ifdef CONFIG_TLS_TOE |
f66de3ee | 707 | prot[TLS_HW_RECORD][TLS_HW_RECORD] = *base; |
0eb8745e JK |
708 | prot[TLS_HW_RECORD][TLS_HW_RECORD].hash = tls_toe_hash; |
709 | prot[TLS_HW_RECORD][TLS_HW_RECORD].unhash = tls_toe_unhash; | |
53b4414a | 710 | #endif |
c113187d BP |
711 | } |
712 | ||
3c4d7559 DW |
713 | static int tls_init(struct sock *sk) |
714 | { | |
3c4d7559 DW |
715 | struct tls_context *ctx; |
716 | int rc = 0; | |
717 | ||
16bed0e6 JK |
718 | tls_build_proto(sk); |
719 | ||
53b4414a | 720 | #ifdef CONFIG_TLS_TOE |
0eb8745e | 721 | if (tls_toe_bypass(sk)) |
95fa1454 | 722 | return 0; |
53b4414a | 723 | #endif |
dd0bed16 | 724 | |
d91c3e17 IL |
725 | /* The TLS ulp is currently supported only for TCP sockets |
726 | * in ESTABLISHED state. | |
727 | * Supporting sockets in LISTEN state will require us | |
728 | * to modify the accept implementation to clone rather then | |
729 | * share the ulp context. | |
730 | */ | |
731 | if (sk->sk_state != TCP_ESTABLISHED) | |
4a5cdc60 | 732 | return -ENOTCONN; |
d91c3e17 | 733 | |
3c4d7559 | 734 | /* allocate tls context */ |
95fa1454 | 735 | write_lock_bh(&sk->sk_callback_lock); |
08700dab | 736 | ctx = tls_ctx_create(sk); |
3c4d7559 DW |
737 | if (!ctx) { |
738 | rc = -ENOMEM; | |
739 | goto out; | |
740 | } | |
6d88207f | 741 | |
f66de3ee BP |
742 | ctx->tx_conf = TLS_BASE; |
743 | ctx->rx_conf = TLS_BASE; | |
6d88207f | 744 | update_sk_prot(sk, ctx); |
3c4d7559 | 745 | out: |
95fa1454 | 746 | write_unlock_bh(&sk->sk_callback_lock); |
3c4d7559 DW |
747 | return rc; |
748 | } | |
749 | ||
33bfe20d JF |
750 | static void tls_update(struct sock *sk, struct proto *p, |
751 | void (*write_space)(struct sock *sk)) | |
95fa1454 JF |
752 | { |
753 | struct tls_context *ctx; | |
754 | ||
755 | ctx = tls_get_ctx(sk); | |
33bfe20d JF |
756 | if (likely(ctx)) { |
757 | ctx->sk_write_space = write_space; | |
95fa1454 | 758 | ctx->sk_proto = p; |
33bfe20d | 759 | } else { |
b8e202d1 JS |
760 | /* Pairs with lockless read in sk_clone_lock(). */ |
761 | WRITE_ONCE(sk->sk_prot, p); | |
33bfe20d JF |
762 | sk->sk_write_space = write_space; |
763 | } | |
95fa1454 JF |
764 | } |
765 | ||
26811cc9 DC |
766 | static int tls_get_info(const struct sock *sk, struct sk_buff *skb) |
767 | { | |
768 | u16 version, cipher_type; | |
769 | struct tls_context *ctx; | |
770 | struct nlattr *start; | |
771 | int err; | |
772 | ||
773 | start = nla_nest_start_noflag(skb, INET_ULP_INFO_TLS); | |
774 | if (!start) | |
775 | return -EMSGSIZE; | |
776 | ||
777 | rcu_read_lock(); | |
778 | ctx = rcu_dereference(inet_csk(sk)->icsk_ulp_data); | |
779 | if (!ctx) { | |
780 | err = 0; | |
781 | goto nla_failure; | |
782 | } | |
783 | version = ctx->prot_info.version; | |
784 | if (version) { | |
785 | err = nla_put_u16(skb, TLS_INFO_VERSION, version); | |
786 | if (err) | |
787 | goto nla_failure; | |
788 | } | |
789 | cipher_type = ctx->prot_info.cipher_type; | |
790 | if (cipher_type) { | |
791 | err = nla_put_u16(skb, TLS_INFO_CIPHER, cipher_type); | |
792 | if (err) | |
793 | goto nla_failure; | |
794 | } | |
795 | err = nla_put_u16(skb, TLS_INFO_TXCONF, tls_user_config(ctx, true)); | |
796 | if (err) | |
797 | goto nla_failure; | |
798 | ||
799 | err = nla_put_u16(skb, TLS_INFO_RXCONF, tls_user_config(ctx, false)); | |
800 | if (err) | |
801 | goto nla_failure; | |
802 | ||
803 | rcu_read_unlock(); | |
804 | nla_nest_end(skb, start); | |
805 | return 0; | |
806 | ||
807 | nla_failure: | |
808 | rcu_read_unlock(); | |
809 | nla_nest_cancel(skb, start); | |
810 | return err; | |
811 | } | |
812 | ||
813 | static size_t tls_get_info_size(const struct sock *sk) | |
814 | { | |
815 | size_t size = 0; | |
816 | ||
817 | size += nla_total_size(0) + /* INET_ULP_INFO_TLS */ | |
818 | nla_total_size(sizeof(u16)) + /* TLS_INFO_VERSION */ | |
819 | nla_total_size(sizeof(u16)) + /* TLS_INFO_CIPHER */ | |
820 | nla_total_size(sizeof(u16)) + /* TLS_INFO_RXCONF */ | |
821 | nla_total_size(sizeof(u16)) + /* TLS_INFO_TXCONF */ | |
822 | 0; | |
823 | ||
824 | return size; | |
825 | } | |
826 | ||
d26b698d JK |
827 | static int __net_init tls_init_net(struct net *net) |
828 | { | |
829 | int err; | |
830 | ||
831 | net->mib.tls_statistics = alloc_percpu(struct linux_tls_mib); | |
832 | if (!net->mib.tls_statistics) | |
833 | return -ENOMEM; | |
834 | ||
835 | err = tls_proc_init(net); | |
836 | if (err) | |
837 | goto err_free_stats; | |
838 | ||
839 | return 0; | |
840 | err_free_stats: | |
841 | free_percpu(net->mib.tls_statistics); | |
842 | return err; | |
843 | } | |
844 | ||
845 | static void __net_exit tls_exit_net(struct net *net) | |
846 | { | |
847 | tls_proc_fini(net); | |
848 | free_percpu(net->mib.tls_statistics); | |
849 | } | |
850 | ||
851 | static struct pernet_operations tls_proc_ops = { | |
852 | .init = tls_init_net, | |
853 | .exit = tls_exit_net, | |
854 | }; | |
855 | ||
3c4d7559 DW |
856 | static struct tcp_ulp_ops tcp_tls_ulp_ops __read_mostly = { |
857 | .name = "tls", | |
858 | .owner = THIS_MODULE, | |
859 | .init = tls_init, | |
95fa1454 | 860 | .update = tls_update, |
26811cc9 DC |
861 | .get_info = tls_get_info, |
862 | .get_info_size = tls_get_info_size, | |
3c4d7559 DW |
863 | }; |
864 | ||
865 | static int __init tls_register(void) | |
866 | { | |
d26b698d JK |
867 | int err; |
868 | ||
869 | err = register_pernet_subsys(&tls_proc_ops); | |
870 | if (err) | |
871 | return err; | |
872 | ||
c46234eb | 873 | tls_sw_proto_ops = inet_stream_ops; |
c46234eb | 874 | tls_sw_proto_ops.splice_read = tls_sw_splice_read; |
0403a2b5 | 875 | tls_sw_proto_ops.sendpage_locked = tls_sw_sendpage_locked; |
c46234eb | 876 | |
e8f69799 | 877 | tls_device_init(); |
3c4d7559 DW |
878 | tcp_register_ulp(&tcp_tls_ulp_ops); |
879 | ||
880 | return 0; | |
881 | } | |
882 | ||
883 | static void __exit tls_unregister(void) | |
884 | { | |
885 | tcp_unregister_ulp(&tcp_tls_ulp_ops); | |
e8f69799 | 886 | tls_device_cleanup(); |
d26b698d | 887 | unregister_pernet_subsys(&tls_proc_ops); |
3c4d7559 DW |
888 | } |
889 | ||
890 | module_init(tls_register); | |
891 | module_exit(tls_unregister); |