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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]; |
00e5a19b | 64 | static struct proto_ops tls_proto_ops[TLS_NUM_PROTS][TLS_NUM_CONFIG][TLS_NUM_CONFIG]; |
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]); | |
00e5a19b JK |
74 | WRITE_ONCE(sk->sk_socket->ops, |
75 | &tls_proto_ops[ip_ver][ctx->tx_conf][ctx->rx_conf]); | |
6d88207f | 76 | } |
3c4d7559 DW |
77 | |
78 | int wait_on_pending_writer(struct sock *sk, long *timeo) | |
79 | { | |
80 | int rc = 0; | |
81 | DEFINE_WAIT_FUNC(wait, woken_wake_function); | |
82 | ||
83 | add_wait_queue(sk_sleep(sk), &wait); | |
84 | while (1) { | |
85 | if (!*timeo) { | |
86 | rc = -EAGAIN; | |
87 | break; | |
88 | } | |
89 | ||
90 | if (signal_pending(current)) { | |
91 | rc = sock_intr_errno(*timeo); | |
92 | break; | |
93 | } | |
94 | ||
95 | if (sk_wait_event(sk, timeo, !sk->sk_write_pending, &wait)) | |
96 | break; | |
97 | } | |
98 | remove_wait_queue(sk_sleep(sk), &wait); | |
99 | return rc; | |
100 | } | |
101 | ||
102 | int tls_push_sg(struct sock *sk, | |
103 | struct tls_context *ctx, | |
104 | struct scatterlist *sg, | |
105 | u16 first_offset, | |
106 | int flags) | |
107 | { | |
108 | int sendpage_flags = flags | MSG_SENDPAGE_NOTLAST; | |
109 | int ret = 0; | |
110 | struct page *p; | |
111 | size_t size; | |
112 | int offset = first_offset; | |
113 | ||
114 | size = sg->length - offset; | |
115 | offset += sg->offset; | |
116 | ||
c212d2c7 | 117 | ctx->in_tcp_sendpages = true; |
3c4d7559 DW |
118 | while (1) { |
119 | if (sg_is_last(sg)) | |
120 | sendpage_flags = flags; | |
121 | ||
122 | /* is sending application-limited? */ | |
123 | tcp_rate_check_app_limited(sk); | |
124 | p = sg_page(sg); | |
125 | retry: | |
126 | ret = do_tcp_sendpages(sk, p, offset, size, sendpage_flags); | |
127 | ||
128 | if (ret != size) { | |
129 | if (ret > 0) { | |
130 | offset += ret; | |
131 | size -= ret; | |
132 | goto retry; | |
133 | } | |
134 | ||
135 | offset -= sg->offset; | |
136 | ctx->partially_sent_offset = offset; | |
137 | ctx->partially_sent_record = (void *)sg; | |
080324c3 | 138 | ctx->in_tcp_sendpages = false; |
3c4d7559 DW |
139 | return ret; |
140 | } | |
141 | ||
142 | put_page(p); | |
143 | sk_mem_uncharge(sk, sg->length); | |
144 | sg = sg_next(sg); | |
145 | if (!sg) | |
146 | break; | |
147 | ||
148 | offset = sg->offset; | |
149 | size = sg->length; | |
150 | } | |
151 | ||
c212d2c7 | 152 | ctx->in_tcp_sendpages = false; |
3c4d7559 DW |
153 | |
154 | return 0; | |
155 | } | |
156 | ||
157 | static int tls_handle_open_record(struct sock *sk, int flags) | |
158 | { | |
159 | struct tls_context *ctx = tls_get_ctx(sk); | |
160 | ||
161 | if (tls_is_pending_open_record(ctx)) | |
162 | return ctx->push_pending_record(sk, flags); | |
163 | ||
164 | return 0; | |
165 | } | |
166 | ||
167 | int tls_proccess_cmsg(struct sock *sk, struct msghdr *msg, | |
168 | unsigned char *record_type) | |
169 | { | |
170 | struct cmsghdr *cmsg; | |
171 | int rc = -EINVAL; | |
172 | ||
173 | for_each_cmsghdr(cmsg, msg) { | |
174 | if (!CMSG_OK(msg, cmsg)) | |
175 | return -EINVAL; | |
176 | if (cmsg->cmsg_level != SOL_TLS) | |
177 | continue; | |
178 | ||
179 | switch (cmsg->cmsg_type) { | |
180 | case TLS_SET_RECORD_TYPE: | |
181 | if (cmsg->cmsg_len < CMSG_LEN(sizeof(*record_type))) | |
182 | return -EINVAL; | |
183 | ||
184 | if (msg->msg_flags & MSG_MORE) | |
185 | return -EINVAL; | |
186 | ||
187 | rc = tls_handle_open_record(sk, msg->msg_flags); | |
188 | if (rc) | |
189 | return rc; | |
190 | ||
191 | *record_type = *(unsigned char *)CMSG_DATA(cmsg); | |
192 | rc = 0; | |
193 | break; | |
194 | default: | |
195 | return -EINVAL; | |
196 | } | |
197 | } | |
198 | ||
199 | return rc; | |
200 | } | |
201 | ||
a42055e8 VG |
202 | int tls_push_partial_record(struct sock *sk, struct tls_context *ctx, |
203 | int flags) | |
3c4d7559 DW |
204 | { |
205 | struct scatterlist *sg; | |
206 | u16 offset; | |
207 | ||
3c4d7559 DW |
208 | sg = ctx->partially_sent_record; |
209 | offset = ctx->partially_sent_offset; | |
210 | ||
211 | ctx->partially_sent_record = NULL; | |
212 | return tls_push_sg(sk, ctx, sg, offset, flags); | |
213 | } | |
214 | ||
c5daa6cc | 215 | void tls_free_partial_record(struct sock *sk, struct tls_context *ctx) |
35b71a34 JK |
216 | { |
217 | struct scatterlist *sg; | |
218 | ||
c5daa6cc | 219 | for (sg = ctx->partially_sent_record; sg; sg = sg_next(sg)) { |
35b71a34 JK |
220 | put_page(sg_page(sg)); |
221 | sk_mem_uncharge(sk, sg->length); | |
35b71a34 JK |
222 | } |
223 | ctx->partially_sent_record = NULL; | |
35b71a34 JK |
224 | } |
225 | ||
3c4d7559 DW |
226 | static void tls_write_space(struct sock *sk) |
227 | { | |
228 | struct tls_context *ctx = tls_get_ctx(sk); | |
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 | |
7463d3a2 BP |
239 | #ifdef CONFIG_TLS_DEVICE |
240 | if (ctx->tx_conf == TLS_HW) | |
241 | tls_device_write_space(sk, ctx); | |
242 | else | |
243 | #endif | |
244 | tls_sw_write_space(sk, ctx); | |
4504ab0e VG |
245 | |
246 | ctx->sk_write_space(sk); | |
3c4d7559 DW |
247 | } |
248 | ||
15a7dea7 JK |
249 | /** |
250 | * tls_ctx_free() - free TLS ULP context | |
251 | * @sk: socket to with @ctx is attached | |
252 | * @ctx: TLS context structure | |
253 | * | |
254 | * Free TLS context. If @sk is %NULL caller guarantees that the socket | |
255 | * to which @ctx was attached has no outstanding references. | |
256 | */ | |
257 | void tls_ctx_free(struct sock *sk, struct tls_context *ctx) | |
86029d10 SD |
258 | { |
259 | if (!ctx) | |
260 | return; | |
261 | ||
262 | memzero_explicit(&ctx->crypto_send, sizeof(ctx->crypto_send)); | |
263 | memzero_explicit(&ctx->crypto_recv, sizeof(ctx->crypto_recv)); | |
79ffe608 | 264 | mutex_destroy(&ctx->tx_lock); |
15a7dea7 JK |
265 | |
266 | if (sk) | |
267 | kfree_rcu(ctx, rcu); | |
268 | else | |
269 | kfree(ctx); | |
86029d10 SD |
270 | } |
271 | ||
313ab004 JF |
272 | static void tls_sk_proto_cleanup(struct sock *sk, |
273 | struct tls_context *ctx, long timeo) | |
3c4d7559 | 274 | { |
9354544c DM |
275 | if (unlikely(sk->sk_write_pending) && |
276 | !wait_on_pending_writer(sk, &timeo)) | |
3c4d7559 DW |
277 | tls_handle_open_record(sk, 0); |
278 | ||
f66de3ee BP |
279 | /* We need these for tls_sw_fallback handling of other packets */ |
280 | if (ctx->tx_conf == TLS_SW) { | |
281 | kfree(ctx->tx.rec_seq); | |
282 | kfree(ctx->tx.iv); | |
313ab004 | 283 | tls_sw_release_resources_tx(sk); |
b32fd3cc | 284 | TLS_DEC_STATS(sock_net(sk), LINUX_MIB_TLSCURRTXSW); |
35b71a34 JK |
285 | } else if (ctx->tx_conf == TLS_HW) { |
286 | tls_device_free_resources_tx(sk); | |
b32fd3cc | 287 | TLS_DEC_STATS(sock_net(sk), LINUX_MIB_TLSCURRTXDEVICE); |
f66de3ee | 288 | } |
3c4d7559 | 289 | |
b32fd3cc | 290 | if (ctx->rx_conf == TLS_SW) { |
313ab004 | 291 | tls_sw_release_resources_rx(sk); |
b32fd3cc JK |
292 | TLS_DEC_STATS(sock_net(sk), LINUX_MIB_TLSCURRRXSW); |
293 | } else if (ctx->rx_conf == TLS_HW) { | |
4799ac81 | 294 | tls_device_offload_cleanup_rx(sk); |
b32fd3cc JK |
295 | TLS_DEC_STATS(sock_net(sk), LINUX_MIB_TLSCURRRXDEVICE); |
296 | } | |
313ab004 JF |
297 | } |
298 | ||
299 | static void tls_sk_proto_close(struct sock *sk, long timeout) | |
300 | { | |
95fa1454 | 301 | struct inet_connection_sock *icsk = inet_csk(sk); |
313ab004 JF |
302 | struct tls_context *ctx = tls_get_ctx(sk); |
303 | long timeo = sock_sndtimeo(sk, 0); | |
304 | bool free_ctx; | |
305 | ||
306 | if (ctx->tx_conf == TLS_SW) | |
307 | tls_sw_cancel_work_tx(ctx); | |
308 | ||
309 | lock_sock(sk); | |
310 | free_ctx = ctx->tx_conf != TLS_HW && ctx->rx_conf != TLS_HW; | |
313ab004 JF |
311 | |
312 | if (ctx->tx_conf != TLS_BASE || ctx->rx_conf != TLS_BASE) | |
313 | tls_sk_proto_cleanup(sk, ctx, timeo); | |
e8f69799 | 314 | |
95fa1454 JF |
315 | write_lock_bh(&sk->sk_callback_lock); |
316 | if (free_ctx) | |
15a7dea7 | 317 | rcu_assign_pointer(icsk->icsk_ulp_data, NULL); |
d5bee737 | 318 | WRITE_ONCE(sk->sk_prot, ctx->sk_proto); |
d85f0177 JF |
319 | if (sk->sk_write_space == tls_write_space) |
320 | sk->sk_write_space = ctx->sk_write_space; | |
95fa1454 | 321 | write_unlock_bh(&sk->sk_callback_lock); |
3c4d7559 | 322 | release_sock(sk); |
313ab004 JF |
323 | if (ctx->tx_conf == TLS_SW) |
324 | tls_sw_free_ctx_tx(ctx); | |
325 | if (ctx->rx_conf == TLS_SW || ctx->rx_conf == TLS_HW) | |
326 | tls_sw_strparser_done(ctx); | |
327 | if (ctx->rx_conf == TLS_SW) | |
328 | tls_sw_free_ctx_rx(ctx); | |
be7bbea1 | 329 | ctx->sk_proto->close(sk, timeout); |
313ab004 | 330 | |
98f0a395 | 331 | if (free_ctx) |
15a7dea7 | 332 | tls_ctx_free(sk, ctx); |
3c4d7559 DW |
333 | } |
334 | ||
ffa81fa4 YH |
335 | static int do_tls_getsockopt_conf(struct sock *sk, char __user *optval, |
336 | int __user *optlen, int tx) | |
3c4d7559 DW |
337 | { |
338 | int rc = 0; | |
339 | struct tls_context *ctx = tls_get_ctx(sk); | |
340 | struct tls_crypto_info *crypto_info; | |
ffa81fa4 | 341 | struct cipher_context *cctx; |
3c4d7559 DW |
342 | int len; |
343 | ||
344 | if (get_user(len, optlen)) | |
345 | return -EFAULT; | |
346 | ||
347 | if (!optval || (len < sizeof(*crypto_info))) { | |
348 | rc = -EINVAL; | |
349 | goto out; | |
350 | } | |
351 | ||
352 | if (!ctx) { | |
353 | rc = -EBUSY; | |
354 | goto out; | |
355 | } | |
356 | ||
357 | /* get user crypto info */ | |
ffa81fa4 YH |
358 | if (tx) { |
359 | crypto_info = &ctx->crypto_send.info; | |
360 | cctx = &ctx->tx; | |
361 | } else { | |
362 | crypto_info = &ctx->crypto_recv.info; | |
363 | cctx = &ctx->rx; | |
364 | } | |
3c4d7559 DW |
365 | |
366 | if (!TLS_CRYPTO_INFO_READY(crypto_info)) { | |
367 | rc = -EBUSY; | |
368 | goto out; | |
369 | } | |
370 | ||
5a3b886c | 371 | if (len == sizeof(*crypto_info)) { |
ac55cd61 DC |
372 | if (copy_to_user(optval, crypto_info, sizeof(*crypto_info))) |
373 | rc = -EFAULT; | |
3c4d7559 DW |
374 | goto out; |
375 | } | |
376 | ||
377 | switch (crypto_info->cipher_type) { | |
378 | case TLS_CIPHER_AES_GCM_128: { | |
379 | struct tls12_crypto_info_aes_gcm_128 * | |
380 | crypto_info_aes_gcm_128 = | |
381 | container_of(crypto_info, | |
382 | struct tls12_crypto_info_aes_gcm_128, | |
383 | info); | |
384 | ||
385 | if (len != sizeof(*crypto_info_aes_gcm_128)) { | |
386 | rc = -EINVAL; | |
387 | goto out; | |
388 | } | |
389 | lock_sock(sk); | |
a1dfa681 | 390 | memcpy(crypto_info_aes_gcm_128->iv, |
ffa81fa4 | 391 | cctx->iv + TLS_CIPHER_AES_GCM_128_SALT_SIZE, |
3c4d7559 | 392 | TLS_CIPHER_AES_GCM_128_IV_SIZE); |
ffa81fa4 | 393 | memcpy(crypto_info_aes_gcm_128->rec_seq, cctx->rec_seq, |
c410c196 | 394 | TLS_CIPHER_AES_GCM_128_REC_SEQ_SIZE); |
3c4d7559 | 395 | release_sock(sk); |
ac55cd61 DC |
396 | if (copy_to_user(optval, |
397 | crypto_info_aes_gcm_128, | |
398 | sizeof(*crypto_info_aes_gcm_128))) | |
399 | rc = -EFAULT; | |
3c4d7559 DW |
400 | break; |
401 | } | |
fb99bce7 DW |
402 | case TLS_CIPHER_AES_GCM_256: { |
403 | struct tls12_crypto_info_aes_gcm_256 * | |
404 | crypto_info_aes_gcm_256 = | |
405 | container_of(crypto_info, | |
406 | struct tls12_crypto_info_aes_gcm_256, | |
407 | info); | |
408 | ||
409 | if (len != sizeof(*crypto_info_aes_gcm_256)) { | |
410 | rc = -EINVAL; | |
411 | goto out; | |
412 | } | |
413 | lock_sock(sk); | |
414 | memcpy(crypto_info_aes_gcm_256->iv, | |
ffa81fa4 | 415 | cctx->iv + TLS_CIPHER_AES_GCM_256_SALT_SIZE, |
fb99bce7 | 416 | TLS_CIPHER_AES_GCM_256_IV_SIZE); |
ffa81fa4 | 417 | memcpy(crypto_info_aes_gcm_256->rec_seq, cctx->rec_seq, |
fb99bce7 DW |
418 | TLS_CIPHER_AES_GCM_256_REC_SEQ_SIZE); |
419 | release_sock(sk); | |
420 | if (copy_to_user(optval, | |
421 | crypto_info_aes_gcm_256, | |
422 | sizeof(*crypto_info_aes_gcm_256))) | |
423 | rc = -EFAULT; | |
424 | break; | |
425 | } | |
3c4d7559 DW |
426 | default: |
427 | rc = -EINVAL; | |
428 | } | |
429 | ||
430 | out: | |
431 | return rc; | |
432 | } | |
433 | ||
434 | static int do_tls_getsockopt(struct sock *sk, int optname, | |
435 | char __user *optval, int __user *optlen) | |
436 | { | |
437 | int rc = 0; | |
438 | ||
439 | switch (optname) { | |
440 | case TLS_TX: | |
ffa81fa4 YH |
441 | case TLS_RX: |
442 | rc = do_tls_getsockopt_conf(sk, optval, optlen, | |
443 | optname == TLS_TX); | |
3c4d7559 DW |
444 | break; |
445 | default: | |
446 | rc = -ENOPROTOOPT; | |
447 | break; | |
448 | } | |
449 | return rc; | |
450 | } | |
451 | ||
452 | static int tls_getsockopt(struct sock *sk, int level, int optname, | |
453 | char __user *optval, int __user *optlen) | |
454 | { | |
455 | struct tls_context *ctx = tls_get_ctx(sk); | |
456 | ||
457 | if (level != SOL_TLS) | |
be7bbea1 JK |
458 | return ctx->sk_proto->getsockopt(sk, level, |
459 | optname, optval, optlen); | |
3c4d7559 DW |
460 | |
461 | return do_tls_getsockopt(sk, optname, optval, optlen); | |
462 | } | |
463 | ||
a7b75c5a | 464 | static int do_tls_setsockopt_conf(struct sock *sk, sockptr_t optval, |
c46234eb | 465 | unsigned int optlen, int tx) |
3c4d7559 | 466 | { |
196c31b4 | 467 | struct tls_crypto_info *crypto_info; |
4509de14 | 468 | struct tls_crypto_info *alt_crypto_info; |
3c4d7559 | 469 | struct tls_context *ctx = tls_get_ctx(sk); |
fb99bce7 | 470 | size_t optsize; |
3c4d7559 | 471 | int rc = 0; |
58371585 | 472 | int conf; |
3c4d7559 | 473 | |
a7b75c5a | 474 | if (sockptr_is_null(optval) || (optlen < sizeof(*crypto_info))) { |
3c4d7559 DW |
475 | rc = -EINVAL; |
476 | goto out; | |
477 | } | |
478 | ||
4509de14 | 479 | if (tx) { |
86029d10 | 480 | crypto_info = &ctx->crypto_send.info; |
4509de14 VG |
481 | alt_crypto_info = &ctx->crypto_recv.info; |
482 | } else { | |
86029d10 | 483 | crypto_info = &ctx->crypto_recv.info; |
4509de14 VG |
484 | alt_crypto_info = &ctx->crypto_send.info; |
485 | } | |
c46234eb | 486 | |
196c31b4 | 487 | /* Currently we don't support set crypto info more than one time */ |
877d17c7 SD |
488 | if (TLS_CRYPTO_INFO_READY(crypto_info)) { |
489 | rc = -EBUSY; | |
196c31b4 | 490 | goto out; |
877d17c7 | 491 | } |
196c31b4 | 492 | |
a7b75c5a | 493 | rc = copy_from_sockptr(crypto_info, optval, sizeof(*crypto_info)); |
3c4d7559 DW |
494 | if (rc) { |
495 | rc = -EFAULT; | |
257082e6 | 496 | goto err_crypto_info; |
3c4d7559 DW |
497 | } |
498 | ||
499 | /* check version */ | |
130b392c DW |
500 | if (crypto_info->version != TLS_1_2_VERSION && |
501 | crypto_info->version != TLS_1_3_VERSION) { | |
4a5cdc60 | 502 | rc = -EINVAL; |
196c31b4 | 503 | goto err_crypto_info; |
3c4d7559 DW |
504 | } |
505 | ||
4509de14 VG |
506 | /* Ensure that TLS version and ciphers are same in both directions */ |
507 | if (TLS_CRYPTO_INFO_READY(alt_crypto_info)) { | |
508 | if (alt_crypto_info->version != crypto_info->version || | |
509 | alt_crypto_info->cipher_type != crypto_info->cipher_type) { | |
510 | rc = -EINVAL; | |
511 | goto err_crypto_info; | |
512 | } | |
513 | } | |
514 | ||
196c31b4 | 515 | switch (crypto_info->cipher_type) { |
fb99bce7 | 516 | case TLS_CIPHER_AES_GCM_128: |
f295b3ae VG |
517 | optsize = sizeof(struct tls12_crypto_info_aes_gcm_128); |
518 | break; | |
fb99bce7 | 519 | case TLS_CIPHER_AES_GCM_256: { |
f295b3ae | 520 | optsize = sizeof(struct tls12_crypto_info_aes_gcm_256); |
3c4d7559 DW |
521 | break; |
522 | } | |
f295b3ae VG |
523 | case TLS_CIPHER_AES_CCM_128: |
524 | optsize = sizeof(struct tls12_crypto_info_aes_ccm_128); | |
525 | break; | |
74ea6106 VF |
526 | case TLS_CIPHER_CHACHA20_POLY1305: |
527 | optsize = sizeof(struct tls12_crypto_info_chacha20_poly1305); | |
528 | break; | |
3c4d7559 DW |
529 | default: |
530 | rc = -EINVAL; | |
6db959c8 | 531 | goto err_crypto_info; |
3c4d7559 DW |
532 | } |
533 | ||
f295b3ae VG |
534 | if (optlen != optsize) { |
535 | rc = -EINVAL; | |
536 | goto err_crypto_info; | |
537 | } | |
538 | ||
d3c48151 CH |
539 | rc = copy_from_sockptr_offset(crypto_info + 1, optval, |
540 | sizeof(*crypto_info), | |
541 | optlen - sizeof(*crypto_info)); | |
f295b3ae VG |
542 | if (rc) { |
543 | rc = -EFAULT; | |
544 | goto err_crypto_info; | |
545 | } | |
546 | ||
c46234eb | 547 | if (tx) { |
e8f69799 IL |
548 | rc = tls_set_device_offload(sk, ctx); |
549 | conf = TLS_HW; | |
b32fd3cc JK |
550 | if (!rc) { |
551 | TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSTXDEVICE); | |
552 | TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSCURRTXDEVICE); | |
553 | } else { | |
e8f69799 | 554 | rc = tls_set_sw_offload(sk, ctx, 1); |
318892ac JK |
555 | if (rc) |
556 | goto err_crypto_info; | |
b32fd3cc JK |
557 | TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSTXSW); |
558 | TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSCURRTXSW); | |
e8f69799 IL |
559 | conf = TLS_SW; |
560 | } | |
c46234eb | 561 | } else { |
4799ac81 BP |
562 | rc = tls_set_device_offload_rx(sk, ctx); |
563 | conf = TLS_HW; | |
b32fd3cc JK |
564 | if (!rc) { |
565 | TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSRXDEVICE); | |
566 | TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSCURRRXDEVICE); | |
567 | } else { | |
4799ac81 | 568 | rc = tls_set_sw_offload(sk, ctx, 0); |
318892ac JK |
569 | if (rc) |
570 | goto err_crypto_info; | |
b32fd3cc JK |
571 | TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSRXSW); |
572 | TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSCURRRXSW); | |
4799ac81 BP |
573 | conf = TLS_SW; |
574 | } | |
313ab004 | 575 | tls_sw_strparser_arm(sk, ctx); |
c46234eb DW |
576 | } |
577 | ||
f66de3ee BP |
578 | if (tx) |
579 | ctx->tx_conf = conf; | |
580 | else | |
581 | ctx->rx_conf = conf; | |
6d88207f | 582 | update_sk_prot(sk, ctx); |
c46234eb DW |
583 | if (tx) { |
584 | ctx->sk_write_space = sk->sk_write_space; | |
585 | sk->sk_write_space = tls_write_space; | |
c46234eb | 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); |
c55dcdd4 | 639 | ctx->sk = sk; |
dd0bed16 AG |
640 | return ctx; |
641 | } | |
642 | ||
00e5a19b JK |
643 | static void build_proto_ops(struct proto_ops ops[TLS_NUM_CONFIG][TLS_NUM_CONFIG], |
644 | const struct proto_ops *base) | |
645 | { | |
646 | ops[TLS_BASE][TLS_BASE] = *base; | |
647 | ||
648 | ops[TLS_SW ][TLS_BASE] = ops[TLS_BASE][TLS_BASE]; | |
649 | ops[TLS_SW ][TLS_BASE].sendpage_locked = tls_sw_sendpage_locked; | |
650 | ||
651 | ops[TLS_BASE][TLS_SW ] = ops[TLS_BASE][TLS_BASE]; | |
652 | ops[TLS_BASE][TLS_SW ].splice_read = tls_sw_splice_read; | |
653 | ||
654 | ops[TLS_SW ][TLS_SW ] = ops[TLS_SW ][TLS_BASE]; | |
655 | ops[TLS_SW ][TLS_SW ].splice_read = tls_sw_splice_read; | |
656 | ||
657 | #ifdef CONFIG_TLS_DEVICE | |
658 | ops[TLS_HW ][TLS_BASE] = ops[TLS_BASE][TLS_BASE]; | |
659 | ops[TLS_HW ][TLS_BASE].sendpage_locked = NULL; | |
660 | ||
661 | ops[TLS_HW ][TLS_SW ] = ops[TLS_BASE][TLS_SW ]; | |
662 | ops[TLS_HW ][TLS_SW ].sendpage_locked = NULL; | |
663 | ||
664 | ops[TLS_BASE][TLS_HW ] = ops[TLS_BASE][TLS_SW ]; | |
665 | ||
666 | ops[TLS_SW ][TLS_HW ] = ops[TLS_SW ][TLS_SW ]; | |
667 | ||
668 | ops[TLS_HW ][TLS_HW ] = ops[TLS_HW ][TLS_SW ]; | |
669 | ops[TLS_HW ][TLS_HW ].sendpage_locked = NULL; | |
670 | #endif | |
671 | #ifdef CONFIG_TLS_TOE | |
672 | ops[TLS_HW_RECORD][TLS_HW_RECORD] = *base; | |
673 | #endif | |
674 | } | |
675 | ||
63a6b3fe AG |
676 | static void tls_build_proto(struct sock *sk) |
677 | { | |
678 | int ip_ver = sk->sk_family == AF_INET6 ? TLSV6 : TLSV4; | |
9a893949 | 679 | struct proto *prot = READ_ONCE(sk->sk_prot); |
63a6b3fe AG |
680 | |
681 | /* Build IPv6 TLS whenever the address of tcpv6 _prot changes */ | |
682 | if (ip_ver == TLSV6 && | |
5bb4c45d | 683 | unlikely(prot != smp_load_acquire(&saved_tcpv6_prot))) { |
63a6b3fe | 684 | mutex_lock(&tcpv6_prot_mutex); |
5bb4c45d JS |
685 | if (likely(prot != saved_tcpv6_prot)) { |
686 | build_protos(tls_prots[TLSV6], prot); | |
00e5a19b JK |
687 | build_proto_ops(tls_proto_ops[TLSV6], |
688 | sk->sk_socket->ops); | |
5bb4c45d | 689 | smp_store_release(&saved_tcpv6_prot, prot); |
63a6b3fe AG |
690 | } |
691 | mutex_unlock(&tcpv6_prot_mutex); | |
692 | } | |
693 | ||
694 | if (ip_ver == TLSV4 && | |
5bb4c45d | 695 | unlikely(prot != smp_load_acquire(&saved_tcpv4_prot))) { |
63a6b3fe | 696 | mutex_lock(&tcpv4_prot_mutex); |
5bb4c45d JS |
697 | if (likely(prot != saved_tcpv4_prot)) { |
698 | build_protos(tls_prots[TLSV4], prot); | |
00e5a19b JK |
699 | build_proto_ops(tls_proto_ops[TLSV4], |
700 | sk->sk_socket->ops); | |
5bb4c45d | 701 | smp_store_release(&saved_tcpv4_prot, prot); |
63a6b3fe AG |
702 | } |
703 | mutex_unlock(&tcpv4_prot_mutex); | |
704 | } | |
705 | } | |
706 | ||
f66de3ee | 707 | static void build_protos(struct proto prot[TLS_NUM_CONFIG][TLS_NUM_CONFIG], |
f13fe3e6 | 708 | const struct proto *base) |
c113187d | 709 | { |
f66de3ee BP |
710 | prot[TLS_BASE][TLS_BASE] = *base; |
711 | prot[TLS_BASE][TLS_BASE].setsockopt = tls_setsockopt; | |
712 | prot[TLS_BASE][TLS_BASE].getsockopt = tls_getsockopt; | |
713 | prot[TLS_BASE][TLS_BASE].close = tls_sk_proto_close; | |
714 | ||
715 | prot[TLS_SW][TLS_BASE] = prot[TLS_BASE][TLS_BASE]; | |
716 | prot[TLS_SW][TLS_BASE].sendmsg = tls_sw_sendmsg; | |
717 | prot[TLS_SW][TLS_BASE].sendpage = tls_sw_sendpage; | |
718 | ||
719 | prot[TLS_BASE][TLS_SW] = prot[TLS_BASE][TLS_BASE]; | |
924ad65e | 720 | prot[TLS_BASE][TLS_SW].recvmsg = tls_sw_recvmsg; |
7b50ecfc | 721 | prot[TLS_BASE][TLS_SW].sock_is_readable = tls_sw_sock_is_readable; |
924ad65e | 722 | prot[TLS_BASE][TLS_SW].close = tls_sk_proto_close; |
f66de3ee BP |
723 | |
724 | prot[TLS_SW][TLS_SW] = prot[TLS_SW][TLS_BASE]; | |
924ad65e | 725 | prot[TLS_SW][TLS_SW].recvmsg = tls_sw_recvmsg; |
7b50ecfc | 726 | prot[TLS_SW][TLS_SW].sock_is_readable = tls_sw_sock_is_readable; |
924ad65e | 727 | prot[TLS_SW][TLS_SW].close = tls_sk_proto_close; |
f66de3ee | 728 | |
e8f69799 IL |
729 | #ifdef CONFIG_TLS_DEVICE |
730 | prot[TLS_HW][TLS_BASE] = prot[TLS_BASE][TLS_BASE]; | |
731 | prot[TLS_HW][TLS_BASE].sendmsg = tls_device_sendmsg; | |
732 | prot[TLS_HW][TLS_BASE].sendpage = tls_device_sendpage; | |
733 | ||
734 | prot[TLS_HW][TLS_SW] = prot[TLS_BASE][TLS_SW]; | |
735 | prot[TLS_HW][TLS_SW].sendmsg = tls_device_sendmsg; | |
736 | prot[TLS_HW][TLS_SW].sendpage = tls_device_sendpage; | |
4799ac81 BP |
737 | |
738 | prot[TLS_BASE][TLS_HW] = prot[TLS_BASE][TLS_SW]; | |
739 | ||
740 | prot[TLS_SW][TLS_HW] = prot[TLS_SW][TLS_SW]; | |
741 | ||
742 | prot[TLS_HW][TLS_HW] = prot[TLS_HW][TLS_SW]; | |
e8f69799 | 743 | #endif |
53b4414a | 744 | #ifdef CONFIG_TLS_TOE |
f66de3ee | 745 | prot[TLS_HW_RECORD][TLS_HW_RECORD] = *base; |
0eb8745e JK |
746 | prot[TLS_HW_RECORD][TLS_HW_RECORD].hash = tls_toe_hash; |
747 | prot[TLS_HW_RECORD][TLS_HW_RECORD].unhash = tls_toe_unhash; | |
53b4414a | 748 | #endif |
c113187d BP |
749 | } |
750 | ||
3c4d7559 DW |
751 | static int tls_init(struct sock *sk) |
752 | { | |
3c4d7559 DW |
753 | struct tls_context *ctx; |
754 | int rc = 0; | |
755 | ||
16bed0e6 JK |
756 | tls_build_proto(sk); |
757 | ||
53b4414a | 758 | #ifdef CONFIG_TLS_TOE |
0eb8745e | 759 | if (tls_toe_bypass(sk)) |
95fa1454 | 760 | return 0; |
53b4414a | 761 | #endif |
dd0bed16 | 762 | |
d91c3e17 IL |
763 | /* The TLS ulp is currently supported only for TCP sockets |
764 | * in ESTABLISHED state. | |
765 | * Supporting sockets in LISTEN state will require us | |
766 | * to modify the accept implementation to clone rather then | |
767 | * share the ulp context. | |
768 | */ | |
769 | if (sk->sk_state != TCP_ESTABLISHED) | |
4a5cdc60 | 770 | return -ENOTCONN; |
d91c3e17 | 771 | |
3c4d7559 | 772 | /* allocate tls context */ |
95fa1454 | 773 | write_lock_bh(&sk->sk_callback_lock); |
08700dab | 774 | ctx = tls_ctx_create(sk); |
3c4d7559 DW |
775 | if (!ctx) { |
776 | rc = -ENOMEM; | |
777 | goto out; | |
778 | } | |
6d88207f | 779 | |
f66de3ee BP |
780 | ctx->tx_conf = TLS_BASE; |
781 | ctx->rx_conf = TLS_BASE; | |
6d88207f | 782 | update_sk_prot(sk, ctx); |
3c4d7559 | 783 | out: |
95fa1454 | 784 | write_unlock_bh(&sk->sk_callback_lock); |
3c4d7559 DW |
785 | return rc; |
786 | } | |
787 | ||
33bfe20d JF |
788 | static void tls_update(struct sock *sk, struct proto *p, |
789 | void (*write_space)(struct sock *sk)) | |
95fa1454 JF |
790 | { |
791 | struct tls_context *ctx; | |
792 | ||
793 | ctx = tls_get_ctx(sk); | |
33bfe20d JF |
794 | if (likely(ctx)) { |
795 | ctx->sk_write_space = write_space; | |
95fa1454 | 796 | ctx->sk_proto = p; |
33bfe20d | 797 | } else { |
b8e202d1 JS |
798 | /* Pairs with lockless read in sk_clone_lock(). */ |
799 | WRITE_ONCE(sk->sk_prot, p); | |
33bfe20d JF |
800 | sk->sk_write_space = write_space; |
801 | } | |
95fa1454 JF |
802 | } |
803 | ||
26811cc9 DC |
804 | static int tls_get_info(const struct sock *sk, struct sk_buff *skb) |
805 | { | |
806 | u16 version, cipher_type; | |
807 | struct tls_context *ctx; | |
808 | struct nlattr *start; | |
809 | int err; | |
810 | ||
811 | start = nla_nest_start_noflag(skb, INET_ULP_INFO_TLS); | |
812 | if (!start) | |
813 | return -EMSGSIZE; | |
814 | ||
815 | rcu_read_lock(); | |
816 | ctx = rcu_dereference(inet_csk(sk)->icsk_ulp_data); | |
817 | if (!ctx) { | |
818 | err = 0; | |
819 | goto nla_failure; | |
820 | } | |
821 | version = ctx->prot_info.version; | |
822 | if (version) { | |
823 | err = nla_put_u16(skb, TLS_INFO_VERSION, version); | |
824 | if (err) | |
825 | goto nla_failure; | |
826 | } | |
827 | cipher_type = ctx->prot_info.cipher_type; | |
828 | if (cipher_type) { | |
829 | err = nla_put_u16(skb, TLS_INFO_CIPHER, cipher_type); | |
830 | if (err) | |
831 | goto nla_failure; | |
832 | } | |
833 | err = nla_put_u16(skb, TLS_INFO_TXCONF, tls_user_config(ctx, true)); | |
834 | if (err) | |
835 | goto nla_failure; | |
836 | ||
837 | err = nla_put_u16(skb, TLS_INFO_RXCONF, tls_user_config(ctx, false)); | |
838 | if (err) | |
839 | goto nla_failure; | |
840 | ||
841 | rcu_read_unlock(); | |
842 | nla_nest_end(skb, start); | |
843 | return 0; | |
844 | ||
845 | nla_failure: | |
846 | rcu_read_unlock(); | |
847 | nla_nest_cancel(skb, start); | |
848 | return err; | |
849 | } | |
850 | ||
851 | static size_t tls_get_info_size(const struct sock *sk) | |
852 | { | |
853 | size_t size = 0; | |
854 | ||
855 | size += nla_total_size(0) + /* INET_ULP_INFO_TLS */ | |
856 | nla_total_size(sizeof(u16)) + /* TLS_INFO_VERSION */ | |
857 | nla_total_size(sizeof(u16)) + /* TLS_INFO_CIPHER */ | |
858 | nla_total_size(sizeof(u16)) + /* TLS_INFO_RXCONF */ | |
859 | nla_total_size(sizeof(u16)) + /* TLS_INFO_TXCONF */ | |
860 | 0; | |
861 | ||
862 | return size; | |
863 | } | |
864 | ||
d26b698d JK |
865 | static int __net_init tls_init_net(struct net *net) |
866 | { | |
867 | int err; | |
868 | ||
869 | net->mib.tls_statistics = alloc_percpu(struct linux_tls_mib); | |
870 | if (!net->mib.tls_statistics) | |
871 | return -ENOMEM; | |
872 | ||
873 | err = tls_proc_init(net); | |
874 | if (err) | |
875 | goto err_free_stats; | |
876 | ||
877 | return 0; | |
878 | err_free_stats: | |
879 | free_percpu(net->mib.tls_statistics); | |
880 | return err; | |
881 | } | |
882 | ||
883 | static void __net_exit tls_exit_net(struct net *net) | |
884 | { | |
885 | tls_proc_fini(net); | |
886 | free_percpu(net->mib.tls_statistics); | |
887 | } | |
888 | ||
889 | static struct pernet_operations tls_proc_ops = { | |
890 | .init = tls_init_net, | |
891 | .exit = tls_exit_net, | |
892 | }; | |
893 | ||
3c4d7559 DW |
894 | static struct tcp_ulp_ops tcp_tls_ulp_ops __read_mostly = { |
895 | .name = "tls", | |
896 | .owner = THIS_MODULE, | |
897 | .init = tls_init, | |
95fa1454 | 898 | .update = tls_update, |
26811cc9 DC |
899 | .get_info = tls_get_info, |
900 | .get_info_size = tls_get_info_size, | |
3c4d7559 DW |
901 | }; |
902 | ||
903 | static int __init tls_register(void) | |
904 | { | |
d26b698d JK |
905 | int err; |
906 | ||
907 | err = register_pernet_subsys(&tls_proc_ops); | |
908 | if (err) | |
909 | return err; | |
910 | ||
e8f69799 | 911 | tls_device_init(); |
3c4d7559 DW |
912 | tcp_register_ulp(&tcp_tls_ulp_ops); |
913 | ||
914 | return 0; | |
915 | } | |
916 | ||
917 | static void __exit tls_unregister(void) | |
918 | { | |
919 | tcp_unregister_ulp(&tcp_tls_ulp_ops); | |
e8f69799 | 920 | tls_device_cleanup(); |
d26b698d | 921 | unregister_pernet_subsys(&tls_proc_ops); |
3c4d7559 DW |
922 | } |
923 | ||
924 | module_init(tls_register); | |
925 | module_exit(tls_unregister); |