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 | * Copyright (c) 2016-2017, Lance Chao <lancerchao@fb.com>. All rights reserved. | |
5 | * Copyright (c) 2016, Fridolin Pokorny <fridolin.pokorny@gmail.com>. All rights reserved. | |
6 | * Copyright (c) 2016, Nikos Mavrogiannopoulos <nmav@gnutls.org>. All rights reserved. | |
d3b18ad3 | 7 | * Copyright (c) 2018, Covalent IO, Inc. http://covalent.io |
3c4d7559 DW |
8 | * |
9 | * This software is available to you under a choice of one of two | |
10 | * licenses. You may choose to be licensed under the terms of the GNU | |
11 | * General Public License (GPL) Version 2, available from the file | |
12 | * COPYING in the main directory of this source tree, or the | |
13 | * OpenIB.org BSD license below: | |
14 | * | |
15 | * Redistribution and use in source and binary forms, with or | |
16 | * without modification, are permitted provided that the following | |
17 | * conditions are met: | |
18 | * | |
19 | * - Redistributions of source code must retain the above | |
20 | * copyright notice, this list of conditions and the following | |
21 | * disclaimer. | |
22 | * | |
23 | * - Redistributions in binary form must reproduce the above | |
24 | * copyright notice, this list of conditions and the following | |
25 | * disclaimer in the documentation and/or other materials | |
26 | * provided with the distribution. | |
27 | * | |
28 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, | |
29 | * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF | |
30 | * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND | |
31 | * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS | |
32 | * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN | |
33 | * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN | |
34 | * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE | |
35 | * SOFTWARE. | |
36 | */ | |
37 | ||
c46234eb | 38 | #include <linux/sched/signal.h> |
3c4d7559 DW |
39 | #include <linux/module.h> |
40 | #include <crypto/aead.h> | |
41 | ||
c46234eb | 42 | #include <net/strparser.h> |
3c4d7559 DW |
43 | #include <net/tls.h> |
44 | ||
b16520f7 KC |
45 | #define MAX_IV_SIZE TLS_CIPHER_AES_GCM_128_IV_SIZE |
46 | ||
0927f71d DRK |
47 | static int __skb_nsg(struct sk_buff *skb, int offset, int len, |
48 | unsigned int recursion_level) | |
49 | { | |
50 | int start = skb_headlen(skb); | |
51 | int i, chunk = start - offset; | |
52 | struct sk_buff *frag_iter; | |
53 | int elt = 0; | |
54 | ||
55 | if (unlikely(recursion_level >= 24)) | |
56 | return -EMSGSIZE; | |
57 | ||
58 | if (chunk > 0) { | |
59 | if (chunk > len) | |
60 | chunk = len; | |
61 | elt++; | |
62 | len -= chunk; | |
63 | if (len == 0) | |
64 | return elt; | |
65 | offset += chunk; | |
66 | } | |
67 | ||
68 | for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) { | |
69 | int end; | |
70 | ||
71 | WARN_ON(start > offset + len); | |
72 | ||
73 | end = start + skb_frag_size(&skb_shinfo(skb)->frags[i]); | |
74 | chunk = end - offset; | |
75 | if (chunk > 0) { | |
76 | if (chunk > len) | |
77 | chunk = len; | |
78 | elt++; | |
79 | len -= chunk; | |
80 | if (len == 0) | |
81 | return elt; | |
82 | offset += chunk; | |
83 | } | |
84 | start = end; | |
85 | } | |
86 | ||
87 | if (unlikely(skb_has_frag_list(skb))) { | |
88 | skb_walk_frags(skb, frag_iter) { | |
89 | int end, ret; | |
90 | ||
91 | WARN_ON(start > offset + len); | |
92 | ||
93 | end = start + frag_iter->len; | |
94 | chunk = end - offset; | |
95 | if (chunk > 0) { | |
96 | if (chunk > len) | |
97 | chunk = len; | |
98 | ret = __skb_nsg(frag_iter, offset - start, chunk, | |
99 | recursion_level + 1); | |
100 | if (unlikely(ret < 0)) | |
101 | return ret; | |
102 | elt += ret; | |
103 | len -= chunk; | |
104 | if (len == 0) | |
105 | return elt; | |
106 | offset += chunk; | |
107 | } | |
108 | start = end; | |
109 | } | |
110 | } | |
111 | BUG_ON(len); | |
112 | return elt; | |
113 | } | |
114 | ||
115 | /* Return the number of scatterlist elements required to completely map the | |
116 | * skb, or -EMSGSIZE if the recursion depth is exceeded. | |
117 | */ | |
118 | static int skb_nsg(struct sk_buff *skb, int offset, int len) | |
119 | { | |
120 | return __skb_nsg(skb, offset, len, 0); | |
121 | } | |
122 | ||
130b392c DW |
123 | static int padding_length(struct tls_sw_context_rx *ctx, |
124 | struct tls_context *tls_ctx, struct sk_buff *skb) | |
125 | { | |
126 | struct strp_msg *rxm = strp_msg(skb); | |
127 | int sub = 0; | |
128 | ||
129 | /* Determine zero-padding length */ | |
4509de14 | 130 | if (tls_ctx->prot_info.version == TLS_1_3_VERSION) { |
130b392c DW |
131 | char content_type = 0; |
132 | int err; | |
133 | int back = 17; | |
134 | ||
135 | while (content_type == 0) { | |
136 | if (back > rxm->full_len) | |
137 | return -EBADMSG; | |
138 | err = skb_copy_bits(skb, | |
139 | rxm->offset + rxm->full_len - back, | |
140 | &content_type, 1); | |
141 | if (content_type) | |
142 | break; | |
143 | sub++; | |
144 | back++; | |
145 | } | |
146 | ctx->control = content_type; | |
147 | } | |
148 | return sub; | |
149 | } | |
150 | ||
94524d8f VG |
151 | static void tls_decrypt_done(struct crypto_async_request *req, int err) |
152 | { | |
153 | struct aead_request *aead_req = (struct aead_request *)req; | |
94524d8f | 154 | struct scatterlist *sgout = aead_req->dst; |
692d7b5d | 155 | struct scatterlist *sgin = aead_req->src; |
7a3dd8c8 JF |
156 | struct tls_sw_context_rx *ctx; |
157 | struct tls_context *tls_ctx; | |
4509de14 | 158 | struct tls_prot_info *prot; |
94524d8f | 159 | struct scatterlist *sg; |
7a3dd8c8 | 160 | struct sk_buff *skb; |
94524d8f | 161 | unsigned int pages; |
7a3dd8c8 JF |
162 | int pending; |
163 | ||
164 | skb = (struct sk_buff *)req->data; | |
165 | tls_ctx = tls_get_ctx(skb->sk); | |
166 | ctx = tls_sw_ctx_rx(tls_ctx); | |
4509de14 | 167 | prot = &tls_ctx->prot_info; |
94524d8f VG |
168 | |
169 | /* Propagate if there was an err */ | |
170 | if (err) { | |
171 | ctx->async_wait.err = err; | |
7a3dd8c8 | 172 | tls_err_abort(skb->sk, err); |
692d7b5d VG |
173 | } else { |
174 | struct strp_msg *rxm = strp_msg(skb); | |
130b392c | 175 | rxm->full_len -= padding_length(ctx, tls_ctx, skb); |
4509de14 VG |
176 | rxm->offset += prot->prepend_size; |
177 | rxm->full_len -= prot->overhead_size; | |
94524d8f VG |
178 | } |
179 | ||
7a3dd8c8 JF |
180 | /* After using skb->sk to propagate sk through crypto async callback |
181 | * we need to NULL it again. | |
182 | */ | |
183 | skb->sk = NULL; | |
184 | ||
94524d8f | 185 | |
692d7b5d VG |
186 | /* Free the destination pages if skb was not decrypted inplace */ |
187 | if (sgout != sgin) { | |
188 | /* Skip the first S/G entry as it points to AAD */ | |
189 | for_each_sg(sg_next(sgout), sg, UINT_MAX, pages) { | |
190 | if (!sg) | |
191 | break; | |
192 | put_page(sg_page(sg)); | |
193 | } | |
94524d8f VG |
194 | } |
195 | ||
196 | kfree(aead_req); | |
197 | ||
692d7b5d VG |
198 | pending = atomic_dec_return(&ctx->decrypt_pending); |
199 | ||
94524d8f VG |
200 | if (!pending && READ_ONCE(ctx->async_notify)) |
201 | complete(&ctx->async_wait.completion); | |
202 | } | |
203 | ||
c46234eb | 204 | static int tls_do_decryption(struct sock *sk, |
94524d8f | 205 | struct sk_buff *skb, |
c46234eb DW |
206 | struct scatterlist *sgin, |
207 | struct scatterlist *sgout, | |
208 | char *iv_recv, | |
209 | size_t data_len, | |
94524d8f VG |
210 | struct aead_request *aead_req, |
211 | bool async) | |
c46234eb DW |
212 | { |
213 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
4509de14 | 214 | struct tls_prot_info *prot = &tls_ctx->prot_info; |
f66de3ee | 215 | struct tls_sw_context_rx *ctx = tls_sw_ctx_rx(tls_ctx); |
c46234eb | 216 | int ret; |
c46234eb | 217 | |
0b243d00 | 218 | aead_request_set_tfm(aead_req, ctx->aead_recv); |
4509de14 | 219 | aead_request_set_ad(aead_req, prot->aad_size); |
c46234eb | 220 | aead_request_set_crypt(aead_req, sgin, sgout, |
4509de14 | 221 | data_len + prot->tag_size, |
c46234eb | 222 | (u8 *)iv_recv); |
c46234eb | 223 | |
94524d8f | 224 | if (async) { |
7a3dd8c8 JF |
225 | /* Using skb->sk to push sk through to crypto async callback |
226 | * handler. This allows propagating errors up to the socket | |
227 | * if needed. It _must_ be cleared in the async handler | |
228 | * before kfree_skb is called. We _know_ skb->sk is NULL | |
229 | * because it is a clone from strparser. | |
230 | */ | |
231 | skb->sk = sk; | |
94524d8f VG |
232 | aead_request_set_callback(aead_req, |
233 | CRYPTO_TFM_REQ_MAY_BACKLOG, | |
234 | tls_decrypt_done, skb); | |
235 | atomic_inc(&ctx->decrypt_pending); | |
236 | } else { | |
237 | aead_request_set_callback(aead_req, | |
238 | CRYPTO_TFM_REQ_MAY_BACKLOG, | |
239 | crypto_req_done, &ctx->async_wait); | |
240 | } | |
241 | ||
242 | ret = crypto_aead_decrypt(aead_req); | |
243 | if (ret == -EINPROGRESS) { | |
244 | if (async) | |
245 | return ret; | |
246 | ||
247 | ret = crypto_wait_req(ret, &ctx->async_wait); | |
248 | } | |
249 | ||
250 | if (async) | |
251 | atomic_dec(&ctx->decrypt_pending); | |
252 | ||
c46234eb DW |
253 | return ret; |
254 | } | |
255 | ||
d829e9c4 | 256 | static void tls_trim_both_msgs(struct sock *sk, int target_size) |
3c4d7559 DW |
257 | { |
258 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
4509de14 | 259 | struct tls_prot_info *prot = &tls_ctx->prot_info; |
f66de3ee | 260 | struct tls_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx); |
a42055e8 | 261 | struct tls_rec *rec = ctx->open_rec; |
3c4d7559 | 262 | |
d829e9c4 | 263 | sk_msg_trim(sk, &rec->msg_plaintext, target_size); |
3c4d7559 | 264 | if (target_size > 0) |
4509de14 | 265 | target_size += prot->overhead_size; |
d829e9c4 | 266 | sk_msg_trim(sk, &rec->msg_encrypted, target_size); |
3c4d7559 DW |
267 | } |
268 | ||
d829e9c4 | 269 | static int tls_alloc_encrypted_msg(struct sock *sk, int len) |
3c4d7559 DW |
270 | { |
271 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
f66de3ee | 272 | struct tls_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx); |
a42055e8 | 273 | struct tls_rec *rec = ctx->open_rec; |
d829e9c4 | 274 | struct sk_msg *msg_en = &rec->msg_encrypted; |
3c4d7559 | 275 | |
d829e9c4 | 276 | return sk_msg_alloc(sk, msg_en, len, 0); |
3c4d7559 DW |
277 | } |
278 | ||
d829e9c4 | 279 | static int tls_clone_plaintext_msg(struct sock *sk, int required) |
3c4d7559 DW |
280 | { |
281 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
4509de14 | 282 | struct tls_prot_info *prot = &tls_ctx->prot_info; |
f66de3ee | 283 | struct tls_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx); |
a42055e8 | 284 | struct tls_rec *rec = ctx->open_rec; |
d829e9c4 DB |
285 | struct sk_msg *msg_pl = &rec->msg_plaintext; |
286 | struct sk_msg *msg_en = &rec->msg_encrypted; | |
4e6d4720 | 287 | int skip, len; |
3c4d7559 | 288 | |
d829e9c4 DB |
289 | /* We add page references worth len bytes from encrypted sg |
290 | * at the end of plaintext sg. It is guaranteed that msg_en | |
4e6d4720 VG |
291 | * has enough required room (ensured by caller). |
292 | */ | |
d829e9c4 | 293 | len = required - msg_pl->sg.size; |
52ea992c | 294 | |
d829e9c4 DB |
295 | /* Skip initial bytes in msg_en's data to be able to use |
296 | * same offset of both plain and encrypted data. | |
4e6d4720 | 297 | */ |
4509de14 | 298 | skip = prot->prepend_size + msg_pl->sg.size; |
4e6d4720 | 299 | |
d829e9c4 | 300 | return sk_msg_clone(sk, msg_pl, msg_en, skip, len); |
3c4d7559 DW |
301 | } |
302 | ||
d3b18ad3 | 303 | static struct tls_rec *tls_get_rec(struct sock *sk) |
3c4d7559 DW |
304 | { |
305 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
4509de14 | 306 | struct tls_prot_info *prot = &tls_ctx->prot_info; |
f66de3ee | 307 | struct tls_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx); |
d3b18ad3 JF |
308 | struct sk_msg *msg_pl, *msg_en; |
309 | struct tls_rec *rec; | |
310 | int mem_size; | |
3c4d7559 | 311 | |
d3b18ad3 JF |
312 | mem_size = sizeof(struct tls_rec) + crypto_aead_reqsize(ctx->aead_send); |
313 | ||
314 | rec = kzalloc(mem_size, sk->sk_allocation); | |
a42055e8 | 315 | if (!rec) |
d3b18ad3 JF |
316 | return NULL; |
317 | ||
318 | msg_pl = &rec->msg_plaintext; | |
319 | msg_en = &rec->msg_encrypted; | |
320 | ||
321 | sk_msg_init(msg_pl); | |
322 | sk_msg_init(msg_en); | |
323 | ||
324 | sg_init_table(rec->sg_aead_in, 2); | |
4509de14 | 325 | sg_set_buf(&rec->sg_aead_in[0], rec->aad_space, prot->aad_size); |
d3b18ad3 JF |
326 | sg_unmark_end(&rec->sg_aead_in[1]); |
327 | ||
328 | sg_init_table(rec->sg_aead_out, 2); | |
4509de14 | 329 | sg_set_buf(&rec->sg_aead_out[0], rec->aad_space, prot->aad_size); |
d3b18ad3 JF |
330 | sg_unmark_end(&rec->sg_aead_out[1]); |
331 | ||
332 | return rec; | |
333 | } | |
a42055e8 | 334 | |
d3b18ad3 JF |
335 | static void tls_free_rec(struct sock *sk, struct tls_rec *rec) |
336 | { | |
d829e9c4 DB |
337 | sk_msg_free(sk, &rec->msg_encrypted); |
338 | sk_msg_free(sk, &rec->msg_plaintext); | |
c774973e | 339 | kfree(rec); |
a42055e8 VG |
340 | } |
341 | ||
d3b18ad3 JF |
342 | static void tls_free_open_rec(struct sock *sk) |
343 | { | |
344 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
345 | struct tls_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx); | |
346 | struct tls_rec *rec = ctx->open_rec; | |
347 | ||
348 | if (rec) { | |
349 | tls_free_rec(sk, rec); | |
350 | ctx->open_rec = NULL; | |
351 | } | |
352 | } | |
353 | ||
a42055e8 VG |
354 | int tls_tx_records(struct sock *sk, int flags) |
355 | { | |
356 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
357 | struct tls_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx); | |
358 | struct tls_rec *rec, *tmp; | |
d829e9c4 | 359 | struct sk_msg *msg_en; |
a42055e8 VG |
360 | int tx_flags, rc = 0; |
361 | ||
362 | if (tls_is_partially_sent_record(tls_ctx)) { | |
9932a29a | 363 | rec = list_first_entry(&ctx->tx_list, |
a42055e8 VG |
364 | struct tls_rec, list); |
365 | ||
366 | if (flags == -1) | |
367 | tx_flags = rec->tx_flags; | |
368 | else | |
369 | tx_flags = flags; | |
370 | ||
371 | rc = tls_push_partial_record(sk, tls_ctx, tx_flags); | |
372 | if (rc) | |
373 | goto tx_err; | |
374 | ||
375 | /* Full record has been transmitted. | |
9932a29a | 376 | * Remove the head of tx_list |
a42055e8 | 377 | */ |
a42055e8 | 378 | list_del(&rec->list); |
d829e9c4 | 379 | sk_msg_free(sk, &rec->msg_plaintext); |
a42055e8 VG |
380 | kfree(rec); |
381 | } | |
382 | ||
9932a29a VG |
383 | /* Tx all ready records */ |
384 | list_for_each_entry_safe(rec, tmp, &ctx->tx_list, list) { | |
385 | if (READ_ONCE(rec->tx_ready)) { | |
a42055e8 VG |
386 | if (flags == -1) |
387 | tx_flags = rec->tx_flags; | |
388 | else | |
389 | tx_flags = flags; | |
390 | ||
d829e9c4 | 391 | msg_en = &rec->msg_encrypted; |
a42055e8 | 392 | rc = tls_push_sg(sk, tls_ctx, |
d829e9c4 | 393 | &msg_en->sg.data[msg_en->sg.curr], |
a42055e8 VG |
394 | 0, tx_flags); |
395 | if (rc) | |
396 | goto tx_err; | |
397 | ||
a42055e8 | 398 | list_del(&rec->list); |
d829e9c4 | 399 | sk_msg_free(sk, &rec->msg_plaintext); |
a42055e8 VG |
400 | kfree(rec); |
401 | } else { | |
402 | break; | |
403 | } | |
404 | } | |
405 | ||
406 | tx_err: | |
407 | if (rc < 0 && rc != -EAGAIN) | |
408 | tls_err_abort(sk, EBADMSG); | |
409 | ||
410 | return rc; | |
411 | } | |
412 | ||
413 | static void tls_encrypt_done(struct crypto_async_request *req, int err) | |
414 | { | |
415 | struct aead_request *aead_req = (struct aead_request *)req; | |
416 | struct sock *sk = req->data; | |
417 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
4509de14 | 418 | struct tls_prot_info *prot = &tls_ctx->prot_info; |
a42055e8 | 419 | struct tls_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx); |
d829e9c4 DB |
420 | struct scatterlist *sge; |
421 | struct sk_msg *msg_en; | |
a42055e8 VG |
422 | struct tls_rec *rec; |
423 | bool ready = false; | |
424 | int pending; | |
425 | ||
426 | rec = container_of(aead_req, struct tls_rec, aead_req); | |
d829e9c4 | 427 | msg_en = &rec->msg_encrypted; |
a42055e8 | 428 | |
d829e9c4 | 429 | sge = sk_msg_elem(msg_en, msg_en->sg.curr); |
4509de14 VG |
430 | sge->offset -= prot->prepend_size; |
431 | sge->length += prot->prepend_size; | |
a42055e8 | 432 | |
80ece6a0 | 433 | /* Check if error is previously set on socket */ |
a42055e8 | 434 | if (err || sk->sk_err) { |
a42055e8 VG |
435 | rec = NULL; |
436 | ||
437 | /* If err is already set on socket, return the same code */ | |
438 | if (sk->sk_err) { | |
439 | ctx->async_wait.err = sk->sk_err; | |
440 | } else { | |
441 | ctx->async_wait.err = err; | |
442 | tls_err_abort(sk, err); | |
443 | } | |
444 | } | |
445 | ||
9932a29a VG |
446 | if (rec) { |
447 | struct tls_rec *first_rec; | |
448 | ||
449 | /* Mark the record as ready for transmission */ | |
450 | smp_store_mb(rec->tx_ready, true); | |
451 | ||
452 | /* If received record is at head of tx_list, schedule tx */ | |
453 | first_rec = list_first_entry(&ctx->tx_list, | |
454 | struct tls_rec, list); | |
455 | if (rec == first_rec) | |
456 | ready = true; | |
457 | } | |
a42055e8 VG |
458 | |
459 | pending = atomic_dec_return(&ctx->encrypt_pending); | |
460 | ||
461 | if (!pending && READ_ONCE(ctx->async_notify)) | |
462 | complete(&ctx->async_wait.completion); | |
463 | ||
464 | if (!ready) | |
465 | return; | |
466 | ||
467 | /* Schedule the transmission */ | |
468 | if (!test_and_set_bit(BIT_TX_SCHEDULED, &ctx->tx_bitmask)) | |
d829e9c4 | 469 | schedule_delayed_work(&ctx->tx_work.work, 1); |
3c4d7559 DW |
470 | } |
471 | ||
a42055e8 VG |
472 | static int tls_do_encryption(struct sock *sk, |
473 | struct tls_context *tls_ctx, | |
a447da7d DB |
474 | struct tls_sw_context_tx *ctx, |
475 | struct aead_request *aead_req, | |
d829e9c4 | 476 | size_t data_len, u32 start) |
3c4d7559 | 477 | { |
4509de14 | 478 | struct tls_prot_info *prot = &tls_ctx->prot_info; |
a42055e8 | 479 | struct tls_rec *rec = ctx->open_rec; |
d829e9c4 DB |
480 | struct sk_msg *msg_en = &rec->msg_encrypted; |
481 | struct scatterlist *sge = sk_msg_elem(msg_en, start); | |
3c4d7559 DW |
482 | int rc; |
483 | ||
32eb67b9 | 484 | memcpy(rec->iv_data, tls_ctx->tx.iv, sizeof(rec->iv_data)); |
4509de14 | 485 | xor_iv_with_seq(prot->version, rec->iv_data, |
130b392c | 486 | tls_ctx->tx.rec_seq); |
32eb67b9 | 487 | |
4509de14 VG |
488 | sge->offset += prot->prepend_size; |
489 | sge->length -= prot->prepend_size; | |
3c4d7559 | 490 | |
d829e9c4 | 491 | msg_en->sg.curr = start; |
4e6d4720 | 492 | |
3c4d7559 | 493 | aead_request_set_tfm(aead_req, ctx->aead_send); |
4509de14 | 494 | aead_request_set_ad(aead_req, prot->aad_size); |
d829e9c4 DB |
495 | aead_request_set_crypt(aead_req, rec->sg_aead_in, |
496 | rec->sg_aead_out, | |
32eb67b9 | 497 | data_len, rec->iv_data); |
a54667f6 VG |
498 | |
499 | aead_request_set_callback(aead_req, CRYPTO_TFM_REQ_MAY_BACKLOG, | |
a42055e8 VG |
500 | tls_encrypt_done, sk); |
501 | ||
9932a29a VG |
502 | /* Add the record in tx_list */ |
503 | list_add_tail((struct list_head *)&rec->list, &ctx->tx_list); | |
a42055e8 | 504 | atomic_inc(&ctx->encrypt_pending); |
a54667f6 | 505 | |
a42055e8 VG |
506 | rc = crypto_aead_encrypt(aead_req); |
507 | if (!rc || rc != -EINPROGRESS) { | |
508 | atomic_dec(&ctx->encrypt_pending); | |
4509de14 VG |
509 | sge->offset -= prot->prepend_size; |
510 | sge->length += prot->prepend_size; | |
a42055e8 | 511 | } |
3c4d7559 | 512 | |
9932a29a VG |
513 | if (!rc) { |
514 | WRITE_ONCE(rec->tx_ready, true); | |
515 | } else if (rc != -EINPROGRESS) { | |
516 | list_del(&rec->list); | |
a42055e8 | 517 | return rc; |
9932a29a | 518 | } |
3c4d7559 | 519 | |
a42055e8 VG |
520 | /* Unhook the record from context if encryption is not failure */ |
521 | ctx->open_rec = NULL; | |
4509de14 | 522 | tls_advance_record_sn(sk, &tls_ctx->tx, prot->version); |
3c4d7559 DW |
523 | return rc; |
524 | } | |
525 | ||
d3b18ad3 JF |
526 | static int tls_split_open_record(struct sock *sk, struct tls_rec *from, |
527 | struct tls_rec **to, struct sk_msg *msg_opl, | |
528 | struct sk_msg *msg_oen, u32 split_point, | |
529 | u32 tx_overhead_size, u32 *orig_end) | |
530 | { | |
531 | u32 i, j, bytes = 0, apply = msg_opl->apply_bytes; | |
532 | struct scatterlist *sge, *osge, *nsge; | |
533 | u32 orig_size = msg_opl->sg.size; | |
534 | struct scatterlist tmp = { }; | |
535 | struct sk_msg *msg_npl; | |
536 | struct tls_rec *new; | |
537 | int ret; | |
538 | ||
539 | new = tls_get_rec(sk); | |
540 | if (!new) | |
541 | return -ENOMEM; | |
542 | ret = sk_msg_alloc(sk, &new->msg_encrypted, msg_opl->sg.size + | |
543 | tx_overhead_size, 0); | |
544 | if (ret < 0) { | |
545 | tls_free_rec(sk, new); | |
546 | return ret; | |
547 | } | |
548 | ||
549 | *orig_end = msg_opl->sg.end; | |
550 | i = msg_opl->sg.start; | |
551 | sge = sk_msg_elem(msg_opl, i); | |
552 | while (apply && sge->length) { | |
553 | if (sge->length > apply) { | |
554 | u32 len = sge->length - apply; | |
555 | ||
556 | get_page(sg_page(sge)); | |
557 | sg_set_page(&tmp, sg_page(sge), len, | |
558 | sge->offset + apply); | |
559 | sge->length = apply; | |
560 | bytes += apply; | |
561 | apply = 0; | |
562 | } else { | |
563 | apply -= sge->length; | |
564 | bytes += sge->length; | |
565 | } | |
566 | ||
567 | sk_msg_iter_var_next(i); | |
568 | if (i == msg_opl->sg.end) | |
569 | break; | |
570 | sge = sk_msg_elem(msg_opl, i); | |
571 | } | |
572 | ||
573 | msg_opl->sg.end = i; | |
574 | msg_opl->sg.curr = i; | |
575 | msg_opl->sg.copybreak = 0; | |
576 | msg_opl->apply_bytes = 0; | |
577 | msg_opl->sg.size = bytes; | |
578 | ||
579 | msg_npl = &new->msg_plaintext; | |
580 | msg_npl->apply_bytes = apply; | |
581 | msg_npl->sg.size = orig_size - bytes; | |
582 | ||
583 | j = msg_npl->sg.start; | |
584 | nsge = sk_msg_elem(msg_npl, j); | |
585 | if (tmp.length) { | |
586 | memcpy(nsge, &tmp, sizeof(*nsge)); | |
587 | sk_msg_iter_var_next(j); | |
588 | nsge = sk_msg_elem(msg_npl, j); | |
589 | } | |
590 | ||
591 | osge = sk_msg_elem(msg_opl, i); | |
592 | while (osge->length) { | |
593 | memcpy(nsge, osge, sizeof(*nsge)); | |
594 | sg_unmark_end(nsge); | |
595 | sk_msg_iter_var_next(i); | |
596 | sk_msg_iter_var_next(j); | |
597 | if (i == *orig_end) | |
598 | break; | |
599 | osge = sk_msg_elem(msg_opl, i); | |
600 | nsge = sk_msg_elem(msg_npl, j); | |
601 | } | |
602 | ||
603 | msg_npl->sg.end = j; | |
604 | msg_npl->sg.curr = j; | |
605 | msg_npl->sg.copybreak = 0; | |
606 | ||
607 | *to = new; | |
608 | return 0; | |
609 | } | |
610 | ||
611 | static void tls_merge_open_record(struct sock *sk, struct tls_rec *to, | |
612 | struct tls_rec *from, u32 orig_end) | |
613 | { | |
614 | struct sk_msg *msg_npl = &from->msg_plaintext; | |
615 | struct sk_msg *msg_opl = &to->msg_plaintext; | |
616 | struct scatterlist *osge, *nsge; | |
617 | u32 i, j; | |
618 | ||
619 | i = msg_opl->sg.end; | |
620 | sk_msg_iter_var_prev(i); | |
621 | j = msg_npl->sg.start; | |
622 | ||
623 | osge = sk_msg_elem(msg_opl, i); | |
624 | nsge = sk_msg_elem(msg_npl, j); | |
625 | ||
626 | if (sg_page(osge) == sg_page(nsge) && | |
627 | osge->offset + osge->length == nsge->offset) { | |
628 | osge->length += nsge->length; | |
629 | put_page(sg_page(nsge)); | |
630 | } | |
631 | ||
632 | msg_opl->sg.end = orig_end; | |
633 | msg_opl->sg.curr = orig_end; | |
634 | msg_opl->sg.copybreak = 0; | |
635 | msg_opl->apply_bytes = msg_opl->sg.size + msg_npl->sg.size; | |
636 | msg_opl->sg.size += msg_npl->sg.size; | |
637 | ||
638 | sk_msg_free(sk, &to->msg_encrypted); | |
639 | sk_msg_xfer_full(&to->msg_encrypted, &from->msg_encrypted); | |
640 | ||
641 | kfree(from); | |
642 | } | |
643 | ||
3c4d7559 DW |
644 | static int tls_push_record(struct sock *sk, int flags, |
645 | unsigned char record_type) | |
646 | { | |
647 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
4509de14 | 648 | struct tls_prot_info *prot = &tls_ctx->prot_info; |
f66de3ee | 649 | struct tls_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx); |
d3b18ad3 JF |
650 | struct tls_rec *rec = ctx->open_rec, *tmp = NULL; |
651 | u32 i, split_point, uninitialized_var(orig_end); | |
d829e9c4 | 652 | struct sk_msg *msg_pl, *msg_en; |
a447da7d | 653 | struct aead_request *req; |
d3b18ad3 | 654 | bool split; |
3c4d7559 DW |
655 | int rc; |
656 | ||
a42055e8 VG |
657 | if (!rec) |
658 | return 0; | |
a447da7d | 659 | |
d829e9c4 DB |
660 | msg_pl = &rec->msg_plaintext; |
661 | msg_en = &rec->msg_encrypted; | |
662 | ||
d3b18ad3 JF |
663 | split_point = msg_pl->apply_bytes; |
664 | split = split_point && split_point < msg_pl->sg.size; | |
665 | if (split) { | |
666 | rc = tls_split_open_record(sk, rec, &tmp, msg_pl, msg_en, | |
4509de14 | 667 | split_point, prot->overhead_size, |
d3b18ad3 JF |
668 | &orig_end); |
669 | if (rc < 0) | |
670 | return rc; | |
671 | sk_msg_trim(sk, msg_en, msg_pl->sg.size + | |
4509de14 | 672 | prot->overhead_size); |
d3b18ad3 JF |
673 | } |
674 | ||
a42055e8 VG |
675 | rec->tx_flags = flags; |
676 | req = &rec->aead_req; | |
3c4d7559 | 677 | |
d829e9c4 DB |
678 | i = msg_pl->sg.end; |
679 | sk_msg_iter_var_prev(i); | |
130b392c DW |
680 | |
681 | rec->content_type = record_type; | |
4509de14 | 682 | if (prot->version == TLS_1_3_VERSION) { |
130b392c DW |
683 | /* Add content type to end of message. No padding added */ |
684 | sg_set_buf(&rec->sg_content_type, &rec->content_type, 1); | |
685 | sg_mark_end(&rec->sg_content_type); | |
686 | sg_chain(msg_pl->sg.data, msg_pl->sg.end + 1, | |
687 | &rec->sg_content_type); | |
688 | } else { | |
689 | sg_mark_end(sk_msg_elem(msg_pl, i)); | |
690 | } | |
a42055e8 | 691 | |
d829e9c4 DB |
692 | i = msg_pl->sg.start; |
693 | sg_chain(rec->sg_aead_in, 2, rec->inplace_crypto ? | |
694 | &msg_en->sg.data[i] : &msg_pl->sg.data[i]); | |
695 | ||
696 | i = msg_en->sg.end; | |
697 | sk_msg_iter_var_prev(i); | |
698 | sg_mark_end(sk_msg_elem(msg_en, i)); | |
699 | ||
700 | i = msg_en->sg.start; | |
701 | sg_chain(rec->sg_aead_out, 2, &msg_en->sg.data[i]); | |
702 | ||
4509de14 VG |
703 | tls_make_aad(rec->aad_space, msg_pl->sg.size + prot->tail_size, |
704 | tls_ctx->tx.rec_seq, prot->rec_seq_size, | |
705 | record_type, prot->version); | |
3c4d7559 DW |
706 | |
707 | tls_fill_prepend(tls_ctx, | |
d829e9c4 | 708 | page_address(sg_page(&msg_en->sg.data[i])) + |
130b392c | 709 | msg_en->sg.data[i].offset, |
4509de14 VG |
710 | msg_pl->sg.size + prot->tail_size, |
711 | record_type, prot->version); | |
3c4d7559 | 712 | |
d829e9c4 | 713 | tls_ctx->pending_open_record_frags = false; |
3c4d7559 | 714 | |
130b392c | 715 | rc = tls_do_encryption(sk, tls_ctx, ctx, req, |
4509de14 | 716 | msg_pl->sg.size + prot->tail_size, i); |
a42055e8 | 717 | if (rc < 0) { |
d3b18ad3 | 718 | if (rc != -EINPROGRESS) { |
d829e9c4 | 719 | tls_err_abort(sk, EBADMSG); |
d3b18ad3 JF |
720 | if (split) { |
721 | tls_ctx->pending_open_record_frags = true; | |
722 | tls_merge_open_record(sk, rec, tmp, orig_end); | |
723 | } | |
724 | } | |
5b053e12 | 725 | ctx->async_capable = 1; |
a42055e8 | 726 | return rc; |
d3b18ad3 JF |
727 | } else if (split) { |
728 | msg_pl = &tmp->msg_plaintext; | |
729 | msg_en = &tmp->msg_encrypted; | |
4509de14 | 730 | sk_msg_trim(sk, msg_en, msg_pl->sg.size + prot->overhead_size); |
d3b18ad3 JF |
731 | tls_ctx->pending_open_record_frags = true; |
732 | ctx->open_rec = tmp; | |
a42055e8 | 733 | } |
3c4d7559 | 734 | |
9932a29a | 735 | return tls_tx_records(sk, flags); |
3c4d7559 DW |
736 | } |
737 | ||
d3b18ad3 JF |
738 | static int bpf_exec_tx_verdict(struct sk_msg *msg, struct sock *sk, |
739 | bool full_record, u8 record_type, | |
740 | size_t *copied, int flags) | |
3c4d7559 DW |
741 | { |
742 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
f66de3ee | 743 | struct tls_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx); |
d3b18ad3 JF |
744 | struct sk_msg msg_redir = { }; |
745 | struct sk_psock *psock; | |
746 | struct sock *sk_redir; | |
a42055e8 | 747 | struct tls_rec *rec; |
0608c69c | 748 | bool enospc, policy; |
d3b18ad3 | 749 | int err = 0, send; |
7246d8ed | 750 | u32 delta = 0; |
d3b18ad3 | 751 | |
0608c69c | 752 | policy = !(flags & MSG_SENDPAGE_NOPOLICY); |
d3b18ad3 | 753 | psock = sk_psock_get(sk); |
0608c69c | 754 | if (!psock || !policy) |
d3b18ad3 JF |
755 | return tls_push_record(sk, flags, record_type); |
756 | more_data: | |
757 | enospc = sk_msg_full(msg); | |
7246d8ed JF |
758 | if (psock->eval == __SK_NONE) { |
759 | delta = msg->sg.size; | |
d3b18ad3 | 760 | psock->eval = sk_psock_msg_verdict(sk, psock, msg); |
7246d8ed JF |
761 | if (delta < msg->sg.size) |
762 | delta -= msg->sg.size; | |
763 | else | |
764 | delta = 0; | |
765 | } | |
d3b18ad3 JF |
766 | if (msg->cork_bytes && msg->cork_bytes > msg->sg.size && |
767 | !enospc && !full_record) { | |
768 | err = -ENOSPC; | |
769 | goto out_err; | |
770 | } | |
771 | msg->cork_bytes = 0; | |
772 | send = msg->sg.size; | |
773 | if (msg->apply_bytes && msg->apply_bytes < send) | |
774 | send = msg->apply_bytes; | |
775 | ||
776 | switch (psock->eval) { | |
777 | case __SK_PASS: | |
778 | err = tls_push_record(sk, flags, record_type); | |
779 | if (err < 0) { | |
780 | *copied -= sk_msg_free(sk, msg); | |
781 | tls_free_open_rec(sk); | |
782 | goto out_err; | |
783 | } | |
784 | break; | |
785 | case __SK_REDIRECT: | |
786 | sk_redir = psock->sk_redir; | |
787 | memcpy(&msg_redir, msg, sizeof(*msg)); | |
788 | if (msg->apply_bytes < send) | |
789 | msg->apply_bytes = 0; | |
790 | else | |
791 | msg->apply_bytes -= send; | |
792 | sk_msg_return_zero(sk, msg, send); | |
793 | msg->sg.size -= send; | |
794 | release_sock(sk); | |
795 | err = tcp_bpf_sendmsg_redir(sk_redir, &msg_redir, send, flags); | |
796 | lock_sock(sk); | |
797 | if (err < 0) { | |
798 | *copied -= sk_msg_free_nocharge(sk, &msg_redir); | |
799 | msg->sg.size = 0; | |
800 | } | |
801 | if (msg->sg.size == 0) | |
802 | tls_free_open_rec(sk); | |
803 | break; | |
804 | case __SK_DROP: | |
805 | default: | |
806 | sk_msg_free_partial(sk, msg, send); | |
807 | if (msg->apply_bytes < send) | |
808 | msg->apply_bytes = 0; | |
809 | else | |
810 | msg->apply_bytes -= send; | |
811 | if (msg->sg.size == 0) | |
812 | tls_free_open_rec(sk); | |
7246d8ed | 813 | *copied -= (send + delta); |
d3b18ad3 JF |
814 | err = -EACCES; |
815 | } | |
a42055e8 | 816 | |
d3b18ad3 JF |
817 | if (likely(!err)) { |
818 | bool reset_eval = !ctx->open_rec; | |
a42055e8 | 819 | |
d3b18ad3 JF |
820 | rec = ctx->open_rec; |
821 | if (rec) { | |
822 | msg = &rec->msg_plaintext; | |
823 | if (!msg->apply_bytes) | |
824 | reset_eval = true; | |
825 | } | |
826 | if (reset_eval) { | |
827 | psock->eval = __SK_NONE; | |
828 | if (psock->sk_redir) { | |
829 | sock_put(psock->sk_redir); | |
830 | psock->sk_redir = NULL; | |
831 | } | |
832 | } | |
833 | if (rec) | |
834 | goto more_data; | |
835 | } | |
836 | out_err: | |
837 | sk_psock_put(sk, psock); | |
838 | return err; | |
839 | } | |
840 | ||
841 | static int tls_sw_push_pending_record(struct sock *sk, int flags) | |
842 | { | |
843 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
844 | struct tls_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx); | |
845 | struct tls_rec *rec = ctx->open_rec; | |
846 | struct sk_msg *msg_pl; | |
847 | size_t copied; | |
a42055e8 | 848 | |
a42055e8 | 849 | if (!rec) |
d3b18ad3 | 850 | return 0; |
a42055e8 | 851 | |
d829e9c4 | 852 | msg_pl = &rec->msg_plaintext; |
d3b18ad3 JF |
853 | copied = msg_pl->sg.size; |
854 | if (!copied) | |
855 | return 0; | |
a42055e8 | 856 | |
d3b18ad3 JF |
857 | return bpf_exec_tx_verdict(msg_pl, sk, true, TLS_RECORD_TYPE_DATA, |
858 | &copied, flags); | |
a42055e8 VG |
859 | } |
860 | ||
861 | int tls_sw_sendmsg(struct sock *sk, struct msghdr *msg, size_t size) | |
862 | { | |
3c4d7559 | 863 | long timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT); |
a42055e8 | 864 | struct tls_context *tls_ctx = tls_get_ctx(sk); |
4509de14 | 865 | struct tls_prot_info *prot = &tls_ctx->prot_info; |
a42055e8 | 866 | struct tls_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx); |
5b053e12 | 867 | bool async_capable = ctx->async_capable; |
a42055e8 | 868 | unsigned char record_type = TLS_RECORD_TYPE_DATA; |
00e23707 | 869 | bool is_kvec = iov_iter_is_kvec(&msg->msg_iter); |
3c4d7559 DW |
870 | bool eor = !(msg->msg_flags & MSG_MORE); |
871 | size_t try_to_copy, copied = 0; | |
d829e9c4 | 872 | struct sk_msg *msg_pl, *msg_en; |
a42055e8 VG |
873 | struct tls_rec *rec; |
874 | int required_size; | |
875 | int num_async = 0; | |
3c4d7559 | 876 | bool full_record; |
a42055e8 VG |
877 | int record_room; |
878 | int num_zc = 0; | |
3c4d7559 | 879 | int orig_size; |
4128c0cf | 880 | int ret = 0; |
3c4d7559 DW |
881 | |
882 | if (msg->msg_flags & ~(MSG_MORE | MSG_DONTWAIT | MSG_NOSIGNAL)) | |
883 | return -ENOTSUPP; | |
884 | ||
885 | lock_sock(sk); | |
886 | ||
a42055e8 VG |
887 | /* Wait till there is any pending write on socket */ |
888 | if (unlikely(sk->sk_write_pending)) { | |
889 | ret = wait_on_pending_writer(sk, &timeo); | |
890 | if (unlikely(ret)) | |
891 | goto send_end; | |
892 | } | |
3c4d7559 DW |
893 | |
894 | if (unlikely(msg->msg_controllen)) { | |
895 | ret = tls_proccess_cmsg(sk, msg, &record_type); | |
a42055e8 VG |
896 | if (ret) { |
897 | if (ret == -EINPROGRESS) | |
898 | num_async++; | |
899 | else if (ret != -EAGAIN) | |
900 | goto send_end; | |
901 | } | |
3c4d7559 DW |
902 | } |
903 | ||
904 | while (msg_data_left(msg)) { | |
905 | if (sk->sk_err) { | |
30be8f8d | 906 | ret = -sk->sk_err; |
3c4d7559 DW |
907 | goto send_end; |
908 | } | |
909 | ||
d3b18ad3 JF |
910 | if (ctx->open_rec) |
911 | rec = ctx->open_rec; | |
912 | else | |
913 | rec = ctx->open_rec = tls_get_rec(sk); | |
a42055e8 VG |
914 | if (!rec) { |
915 | ret = -ENOMEM; | |
916 | goto send_end; | |
917 | } | |
918 | ||
d829e9c4 DB |
919 | msg_pl = &rec->msg_plaintext; |
920 | msg_en = &rec->msg_encrypted; | |
921 | ||
922 | orig_size = msg_pl->sg.size; | |
3c4d7559 DW |
923 | full_record = false; |
924 | try_to_copy = msg_data_left(msg); | |
d829e9c4 | 925 | record_room = TLS_MAX_PAYLOAD_SIZE - msg_pl->sg.size; |
3c4d7559 DW |
926 | if (try_to_copy >= record_room) { |
927 | try_to_copy = record_room; | |
928 | full_record = true; | |
929 | } | |
930 | ||
d829e9c4 | 931 | required_size = msg_pl->sg.size + try_to_copy + |
4509de14 | 932 | prot->overhead_size; |
3c4d7559 DW |
933 | |
934 | if (!sk_stream_memory_free(sk)) | |
935 | goto wait_for_sndbuf; | |
a42055e8 | 936 | |
3c4d7559 | 937 | alloc_encrypted: |
d829e9c4 | 938 | ret = tls_alloc_encrypted_msg(sk, required_size); |
3c4d7559 DW |
939 | if (ret) { |
940 | if (ret != -ENOSPC) | |
941 | goto wait_for_memory; | |
942 | ||
943 | /* Adjust try_to_copy according to the amount that was | |
944 | * actually allocated. The difference is due | |
945 | * to max sg elements limit | |
946 | */ | |
d829e9c4 | 947 | try_to_copy -= required_size - msg_en->sg.size; |
3c4d7559 DW |
948 | full_record = true; |
949 | } | |
a42055e8 VG |
950 | |
951 | if (!is_kvec && (full_record || eor) && !async_capable) { | |
d3b18ad3 JF |
952 | u32 first = msg_pl->sg.end; |
953 | ||
d829e9c4 DB |
954 | ret = sk_msg_zerocopy_from_iter(sk, &msg->msg_iter, |
955 | msg_pl, try_to_copy); | |
3c4d7559 DW |
956 | if (ret) |
957 | goto fallback_to_reg_send; | |
958 | ||
4e6d4720 VG |
959 | rec->inplace_crypto = 0; |
960 | ||
a42055e8 | 961 | num_zc++; |
3c4d7559 | 962 | copied += try_to_copy; |
d3b18ad3 JF |
963 | |
964 | sk_msg_sg_copy_set(msg_pl, first); | |
965 | ret = bpf_exec_tx_verdict(msg_pl, sk, full_record, | |
966 | record_type, &copied, | |
967 | msg->msg_flags); | |
a42055e8 VG |
968 | if (ret) { |
969 | if (ret == -EINPROGRESS) | |
970 | num_async++; | |
d3b18ad3 JF |
971 | else if (ret == -ENOMEM) |
972 | goto wait_for_memory; | |
973 | else if (ret == -ENOSPC) | |
974 | goto rollback_iter; | |
a42055e8 VG |
975 | else if (ret != -EAGAIN) |
976 | goto send_end; | |
977 | } | |
5a3611ef | 978 | continue; |
d3b18ad3 JF |
979 | rollback_iter: |
980 | copied -= try_to_copy; | |
981 | sk_msg_sg_copy_clear(msg_pl, first); | |
982 | iov_iter_revert(&msg->msg_iter, | |
983 | msg_pl->sg.size - orig_size); | |
3c4d7559 | 984 | fallback_to_reg_send: |
d829e9c4 | 985 | sk_msg_trim(sk, msg_pl, orig_size); |
3c4d7559 DW |
986 | } |
987 | ||
d829e9c4 | 988 | required_size = msg_pl->sg.size + try_to_copy; |
4e6d4720 | 989 | |
d829e9c4 | 990 | ret = tls_clone_plaintext_msg(sk, required_size); |
3c4d7559 DW |
991 | if (ret) { |
992 | if (ret != -ENOSPC) | |
4e6d4720 | 993 | goto send_end; |
3c4d7559 DW |
994 | |
995 | /* Adjust try_to_copy according to the amount that was | |
996 | * actually allocated. The difference is due | |
997 | * to max sg elements limit | |
998 | */ | |
d829e9c4 | 999 | try_to_copy -= required_size - msg_pl->sg.size; |
3c4d7559 | 1000 | full_record = true; |
4509de14 VG |
1001 | sk_msg_trim(sk, msg_en, |
1002 | msg_pl->sg.size + prot->overhead_size); | |
3c4d7559 DW |
1003 | } |
1004 | ||
65a10e28 VG |
1005 | if (try_to_copy) { |
1006 | ret = sk_msg_memcopy_from_iter(sk, &msg->msg_iter, | |
1007 | msg_pl, try_to_copy); | |
1008 | if (ret < 0) | |
1009 | goto trim_sgl; | |
1010 | } | |
3c4d7559 | 1011 | |
d829e9c4 DB |
1012 | /* Open records defined only if successfully copied, otherwise |
1013 | * we would trim the sg but not reset the open record frags. | |
1014 | */ | |
1015 | tls_ctx->pending_open_record_frags = true; | |
3c4d7559 DW |
1016 | copied += try_to_copy; |
1017 | if (full_record || eor) { | |
d3b18ad3 JF |
1018 | ret = bpf_exec_tx_verdict(msg_pl, sk, full_record, |
1019 | record_type, &copied, | |
1020 | msg->msg_flags); | |
3c4d7559 | 1021 | if (ret) { |
a42055e8 VG |
1022 | if (ret == -EINPROGRESS) |
1023 | num_async++; | |
d3b18ad3 JF |
1024 | else if (ret == -ENOMEM) |
1025 | goto wait_for_memory; | |
1026 | else if (ret != -EAGAIN) { | |
1027 | if (ret == -ENOSPC) | |
1028 | ret = 0; | |
a42055e8 | 1029 | goto send_end; |
d3b18ad3 | 1030 | } |
3c4d7559 DW |
1031 | } |
1032 | } | |
1033 | ||
1034 | continue; | |
1035 | ||
1036 | wait_for_sndbuf: | |
1037 | set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); | |
1038 | wait_for_memory: | |
1039 | ret = sk_stream_wait_memory(sk, &timeo); | |
1040 | if (ret) { | |
1041 | trim_sgl: | |
d829e9c4 | 1042 | tls_trim_both_msgs(sk, orig_size); |
3c4d7559 DW |
1043 | goto send_end; |
1044 | } | |
1045 | ||
d829e9c4 | 1046 | if (msg_en->sg.size < required_size) |
3c4d7559 | 1047 | goto alloc_encrypted; |
3c4d7559 DW |
1048 | } |
1049 | ||
a42055e8 VG |
1050 | if (!num_async) { |
1051 | goto send_end; | |
1052 | } else if (num_zc) { | |
1053 | /* Wait for pending encryptions to get completed */ | |
1054 | smp_store_mb(ctx->async_notify, true); | |
1055 | ||
1056 | if (atomic_read(&ctx->encrypt_pending)) | |
1057 | crypto_wait_req(-EINPROGRESS, &ctx->async_wait); | |
1058 | else | |
1059 | reinit_completion(&ctx->async_wait.completion); | |
1060 | ||
1061 | WRITE_ONCE(ctx->async_notify, false); | |
1062 | ||
1063 | if (ctx->async_wait.err) { | |
1064 | ret = ctx->async_wait.err; | |
1065 | copied = 0; | |
1066 | } | |
1067 | } | |
1068 | ||
1069 | /* Transmit if any encryptions have completed */ | |
1070 | if (test_and_clear_bit(BIT_TX_SCHEDULED, &ctx->tx_bitmask)) { | |
1071 | cancel_delayed_work(&ctx->tx_work.work); | |
1072 | tls_tx_records(sk, msg->msg_flags); | |
1073 | } | |
1074 | ||
3c4d7559 DW |
1075 | send_end: |
1076 | ret = sk_stream_error(sk, msg->msg_flags, ret); | |
1077 | ||
1078 | release_sock(sk); | |
1079 | return copied ? copied : ret; | |
1080 | } | |
1081 | ||
01cb8a1a Y |
1082 | static int tls_sw_do_sendpage(struct sock *sk, struct page *page, |
1083 | int offset, size_t size, int flags) | |
3c4d7559 | 1084 | { |
a42055e8 | 1085 | long timeo = sock_sndtimeo(sk, flags & MSG_DONTWAIT); |
3c4d7559 | 1086 | struct tls_context *tls_ctx = tls_get_ctx(sk); |
f66de3ee | 1087 | struct tls_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx); |
4509de14 | 1088 | struct tls_prot_info *prot = &tls_ctx->prot_info; |
3c4d7559 | 1089 | unsigned char record_type = TLS_RECORD_TYPE_DATA; |
d829e9c4 | 1090 | struct sk_msg *msg_pl; |
a42055e8 VG |
1091 | struct tls_rec *rec; |
1092 | int num_async = 0; | |
d3b18ad3 | 1093 | size_t copied = 0; |
3c4d7559 DW |
1094 | bool full_record; |
1095 | int record_room; | |
4128c0cf | 1096 | int ret = 0; |
a42055e8 | 1097 | bool eor; |
3c4d7559 | 1098 | |
3c4d7559 | 1099 | eor = !(flags & (MSG_MORE | MSG_SENDPAGE_NOTLAST)); |
3c4d7559 DW |
1100 | sk_clear_bit(SOCKWQ_ASYNC_NOSPACE, sk); |
1101 | ||
a42055e8 VG |
1102 | /* Wait till there is any pending write on socket */ |
1103 | if (unlikely(sk->sk_write_pending)) { | |
1104 | ret = wait_on_pending_writer(sk, &timeo); | |
1105 | if (unlikely(ret)) | |
1106 | goto sendpage_end; | |
1107 | } | |
3c4d7559 DW |
1108 | |
1109 | /* Call the sk_stream functions to manage the sndbuf mem. */ | |
1110 | while (size > 0) { | |
1111 | size_t copy, required_size; | |
1112 | ||
1113 | if (sk->sk_err) { | |
30be8f8d | 1114 | ret = -sk->sk_err; |
3c4d7559 DW |
1115 | goto sendpage_end; |
1116 | } | |
1117 | ||
d3b18ad3 JF |
1118 | if (ctx->open_rec) |
1119 | rec = ctx->open_rec; | |
1120 | else | |
1121 | rec = ctx->open_rec = tls_get_rec(sk); | |
a42055e8 VG |
1122 | if (!rec) { |
1123 | ret = -ENOMEM; | |
1124 | goto sendpage_end; | |
1125 | } | |
1126 | ||
d829e9c4 DB |
1127 | msg_pl = &rec->msg_plaintext; |
1128 | ||
3c4d7559 | 1129 | full_record = false; |
d829e9c4 | 1130 | record_room = TLS_MAX_PAYLOAD_SIZE - msg_pl->sg.size; |
d3b18ad3 | 1131 | copied = 0; |
3c4d7559 DW |
1132 | copy = size; |
1133 | if (copy >= record_room) { | |
1134 | copy = record_room; | |
1135 | full_record = true; | |
1136 | } | |
d829e9c4 | 1137 | |
4509de14 | 1138 | required_size = msg_pl->sg.size + copy + prot->overhead_size; |
3c4d7559 DW |
1139 | |
1140 | if (!sk_stream_memory_free(sk)) | |
1141 | goto wait_for_sndbuf; | |
1142 | alloc_payload: | |
d829e9c4 | 1143 | ret = tls_alloc_encrypted_msg(sk, required_size); |
3c4d7559 DW |
1144 | if (ret) { |
1145 | if (ret != -ENOSPC) | |
1146 | goto wait_for_memory; | |
1147 | ||
1148 | /* Adjust copy according to the amount that was | |
1149 | * actually allocated. The difference is due | |
1150 | * to max sg elements limit | |
1151 | */ | |
d829e9c4 | 1152 | copy -= required_size - msg_pl->sg.size; |
3c4d7559 DW |
1153 | full_record = true; |
1154 | } | |
1155 | ||
d829e9c4 | 1156 | sk_msg_page_add(msg_pl, page, copy, offset); |
3c4d7559 | 1157 | sk_mem_charge(sk, copy); |
d829e9c4 | 1158 | |
3c4d7559 DW |
1159 | offset += copy; |
1160 | size -= copy; | |
d3b18ad3 | 1161 | copied += copy; |
3c4d7559 | 1162 | |
d829e9c4 DB |
1163 | tls_ctx->pending_open_record_frags = true; |
1164 | if (full_record || eor || sk_msg_full(msg_pl)) { | |
4e6d4720 | 1165 | rec->inplace_crypto = 0; |
d3b18ad3 JF |
1166 | ret = bpf_exec_tx_verdict(msg_pl, sk, full_record, |
1167 | record_type, &copied, flags); | |
3c4d7559 | 1168 | if (ret) { |
a42055e8 VG |
1169 | if (ret == -EINPROGRESS) |
1170 | num_async++; | |
d3b18ad3 JF |
1171 | else if (ret == -ENOMEM) |
1172 | goto wait_for_memory; | |
1173 | else if (ret != -EAGAIN) { | |
1174 | if (ret == -ENOSPC) | |
1175 | ret = 0; | |
a42055e8 | 1176 | goto sendpage_end; |
d3b18ad3 | 1177 | } |
3c4d7559 DW |
1178 | } |
1179 | } | |
1180 | continue; | |
1181 | wait_for_sndbuf: | |
1182 | set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); | |
1183 | wait_for_memory: | |
1184 | ret = sk_stream_wait_memory(sk, &timeo); | |
1185 | if (ret) { | |
d829e9c4 | 1186 | tls_trim_both_msgs(sk, msg_pl->sg.size); |
3c4d7559 DW |
1187 | goto sendpage_end; |
1188 | } | |
1189 | ||
3c4d7559 DW |
1190 | goto alloc_payload; |
1191 | } | |
1192 | ||
a42055e8 VG |
1193 | if (num_async) { |
1194 | /* Transmit if any encryptions have completed */ | |
1195 | if (test_and_clear_bit(BIT_TX_SCHEDULED, &ctx->tx_bitmask)) { | |
1196 | cancel_delayed_work(&ctx->tx_work.work); | |
1197 | tls_tx_records(sk, flags); | |
1198 | } | |
1199 | } | |
3c4d7559 | 1200 | sendpage_end: |
d3b18ad3 | 1201 | ret = sk_stream_error(sk, flags, ret); |
d3b18ad3 | 1202 | return copied ? copied : ret; |
3c4d7559 DW |
1203 | } |
1204 | ||
0608c69c JF |
1205 | int tls_sw_sendpage(struct sock *sk, struct page *page, |
1206 | int offset, size_t size, int flags) | |
1207 | { | |
1208 | int ret; | |
1209 | ||
1210 | if (flags & ~(MSG_MORE | MSG_DONTWAIT | MSG_NOSIGNAL | | |
1211 | MSG_SENDPAGE_NOTLAST | MSG_SENDPAGE_NOPOLICY)) | |
1212 | return -ENOTSUPP; | |
1213 | ||
1214 | lock_sock(sk); | |
1215 | ret = tls_sw_do_sendpage(sk, page, offset, size, flags); | |
1216 | release_sock(sk); | |
1217 | return ret; | |
1218 | } | |
1219 | ||
d3b18ad3 JF |
1220 | static struct sk_buff *tls_wait_data(struct sock *sk, struct sk_psock *psock, |
1221 | int flags, long timeo, int *err) | |
c46234eb DW |
1222 | { |
1223 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
f66de3ee | 1224 | struct tls_sw_context_rx *ctx = tls_sw_ctx_rx(tls_ctx); |
c46234eb DW |
1225 | struct sk_buff *skb; |
1226 | DEFINE_WAIT_FUNC(wait, woken_wake_function); | |
1227 | ||
d3b18ad3 | 1228 | while (!(skb = ctx->recv_pkt) && sk_psock_queue_empty(psock)) { |
c46234eb DW |
1229 | if (sk->sk_err) { |
1230 | *err = sock_error(sk); | |
1231 | return NULL; | |
1232 | } | |
1233 | ||
fcf4793e DRK |
1234 | if (sk->sk_shutdown & RCV_SHUTDOWN) |
1235 | return NULL; | |
1236 | ||
c46234eb DW |
1237 | if (sock_flag(sk, SOCK_DONE)) |
1238 | return NULL; | |
1239 | ||
1240 | if ((flags & MSG_DONTWAIT) || !timeo) { | |
1241 | *err = -EAGAIN; | |
1242 | return NULL; | |
1243 | } | |
1244 | ||
1245 | add_wait_queue(sk_sleep(sk), &wait); | |
1246 | sk_set_bit(SOCKWQ_ASYNC_WAITDATA, sk); | |
d3b18ad3 JF |
1247 | sk_wait_event(sk, &timeo, |
1248 | ctx->recv_pkt != skb || | |
1249 | !sk_psock_queue_empty(psock), | |
1250 | &wait); | |
c46234eb DW |
1251 | sk_clear_bit(SOCKWQ_ASYNC_WAITDATA, sk); |
1252 | remove_wait_queue(sk_sleep(sk), &wait); | |
1253 | ||
1254 | /* Handle signals */ | |
1255 | if (signal_pending(current)) { | |
1256 | *err = sock_intr_errno(timeo); | |
1257 | return NULL; | |
1258 | } | |
1259 | } | |
1260 | ||
1261 | return skb; | |
1262 | } | |
1263 | ||
d829e9c4 DB |
1264 | static int tls_setup_from_iter(struct sock *sk, struct iov_iter *from, |
1265 | int length, int *pages_used, | |
1266 | unsigned int *size_used, | |
1267 | struct scatterlist *to, | |
1268 | int to_max_pages) | |
1269 | { | |
1270 | int rc = 0, i = 0, num_elem = *pages_used, maxpages; | |
1271 | struct page *pages[MAX_SKB_FRAGS]; | |
1272 | unsigned int size = *size_used; | |
1273 | ssize_t copied, use; | |
1274 | size_t offset; | |
1275 | ||
1276 | while (length > 0) { | |
1277 | i = 0; | |
1278 | maxpages = to_max_pages - num_elem; | |
1279 | if (maxpages == 0) { | |
1280 | rc = -EFAULT; | |
1281 | goto out; | |
1282 | } | |
1283 | copied = iov_iter_get_pages(from, pages, | |
1284 | length, | |
1285 | maxpages, &offset); | |
1286 | if (copied <= 0) { | |
1287 | rc = -EFAULT; | |
1288 | goto out; | |
1289 | } | |
1290 | ||
1291 | iov_iter_advance(from, copied); | |
1292 | ||
1293 | length -= copied; | |
1294 | size += copied; | |
1295 | while (copied) { | |
1296 | use = min_t(int, copied, PAGE_SIZE - offset); | |
1297 | ||
1298 | sg_set_page(&to[num_elem], | |
1299 | pages[i], use, offset); | |
1300 | sg_unmark_end(&to[num_elem]); | |
1301 | /* We do not uncharge memory from this API */ | |
1302 | ||
1303 | offset = 0; | |
1304 | copied -= use; | |
1305 | ||
1306 | i++; | |
1307 | num_elem++; | |
1308 | } | |
1309 | } | |
1310 | /* Mark the end in the last sg entry if newly added */ | |
1311 | if (num_elem > *pages_used) | |
1312 | sg_mark_end(&to[num_elem - 1]); | |
1313 | out: | |
1314 | if (rc) | |
1315 | iov_iter_revert(from, size - *size_used); | |
1316 | *size_used = size; | |
1317 | *pages_used = num_elem; | |
1318 | ||
1319 | return rc; | |
1320 | } | |
1321 | ||
0b243d00 VG |
1322 | /* This function decrypts the input skb into either out_iov or in out_sg |
1323 | * or in skb buffers itself. The input parameter 'zc' indicates if | |
1324 | * zero-copy mode needs to be tried or not. With zero-copy mode, either | |
1325 | * out_iov or out_sg must be non-NULL. In case both out_iov and out_sg are | |
1326 | * NULL, then the decryption happens inside skb buffers itself, i.e. | |
1327 | * zero-copy gets disabled and 'zc' is updated. | |
1328 | */ | |
1329 | ||
1330 | static int decrypt_internal(struct sock *sk, struct sk_buff *skb, | |
1331 | struct iov_iter *out_iov, | |
1332 | struct scatterlist *out_sg, | |
692d7b5d | 1333 | int *chunk, bool *zc, bool async) |
0b243d00 VG |
1334 | { |
1335 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
1336 | struct tls_sw_context_rx *ctx = tls_sw_ctx_rx(tls_ctx); | |
4509de14 | 1337 | struct tls_prot_info *prot = &tls_ctx->prot_info; |
0b243d00 VG |
1338 | struct strp_msg *rxm = strp_msg(skb); |
1339 | int n_sgin, n_sgout, nsg, mem_size, aead_size, err, pages = 0; | |
1340 | struct aead_request *aead_req; | |
1341 | struct sk_buff *unused; | |
1342 | u8 *aad, *iv, *mem = NULL; | |
1343 | struct scatterlist *sgin = NULL; | |
1344 | struct scatterlist *sgout = NULL; | |
4509de14 VG |
1345 | const int data_len = rxm->full_len - prot->overhead_size + |
1346 | prot->tail_size; | |
0b243d00 VG |
1347 | |
1348 | if (*zc && (out_iov || out_sg)) { | |
1349 | if (out_iov) | |
1350 | n_sgout = iov_iter_npages(out_iov, INT_MAX) + 1; | |
1351 | else | |
1352 | n_sgout = sg_nents(out_sg); | |
4509de14 VG |
1353 | n_sgin = skb_nsg(skb, rxm->offset + prot->prepend_size, |
1354 | rxm->full_len - prot->prepend_size); | |
0b243d00 VG |
1355 | } else { |
1356 | n_sgout = 0; | |
1357 | *zc = false; | |
0927f71d | 1358 | n_sgin = skb_cow_data(skb, 0, &unused); |
0b243d00 VG |
1359 | } |
1360 | ||
0b243d00 VG |
1361 | if (n_sgin < 1) |
1362 | return -EBADMSG; | |
1363 | ||
1364 | /* Increment to accommodate AAD */ | |
1365 | n_sgin = n_sgin + 1; | |
1366 | ||
1367 | nsg = n_sgin + n_sgout; | |
1368 | ||
1369 | aead_size = sizeof(*aead_req) + crypto_aead_reqsize(ctx->aead_recv); | |
1370 | mem_size = aead_size + (nsg * sizeof(struct scatterlist)); | |
4509de14 | 1371 | mem_size = mem_size + prot->aad_size; |
0b243d00 VG |
1372 | mem_size = mem_size + crypto_aead_ivsize(ctx->aead_recv); |
1373 | ||
1374 | /* Allocate a single block of memory which contains | |
1375 | * aead_req || sgin[] || sgout[] || aad || iv. | |
1376 | * This order achieves correct alignment for aead_req, sgin, sgout. | |
1377 | */ | |
1378 | mem = kmalloc(mem_size, sk->sk_allocation); | |
1379 | if (!mem) | |
1380 | return -ENOMEM; | |
1381 | ||
1382 | /* Segment the allocated memory */ | |
1383 | aead_req = (struct aead_request *)mem; | |
1384 | sgin = (struct scatterlist *)(mem + aead_size); | |
1385 | sgout = sgin + n_sgin; | |
1386 | aad = (u8 *)(sgout + n_sgout); | |
4509de14 | 1387 | iv = aad + prot->aad_size; |
0b243d00 VG |
1388 | |
1389 | /* Prepare IV */ | |
1390 | err = skb_copy_bits(skb, rxm->offset + TLS_HEADER_SIZE, | |
1391 | iv + TLS_CIPHER_AES_GCM_128_SALT_SIZE, | |
4509de14 | 1392 | prot->iv_size); |
0b243d00 VG |
1393 | if (err < 0) { |
1394 | kfree(mem); | |
1395 | return err; | |
1396 | } | |
4509de14 | 1397 | if (prot->version == TLS_1_3_VERSION) |
130b392c DW |
1398 | memcpy(iv, tls_ctx->rx.iv, crypto_aead_ivsize(ctx->aead_recv)); |
1399 | else | |
1400 | memcpy(iv, tls_ctx->rx.iv, TLS_CIPHER_AES_GCM_128_SALT_SIZE); | |
1401 | ||
4509de14 | 1402 | xor_iv_with_seq(prot->version, iv, tls_ctx->rx.rec_seq); |
0b243d00 VG |
1403 | |
1404 | /* Prepare AAD */ | |
4509de14 VG |
1405 | tls_make_aad(aad, rxm->full_len - prot->overhead_size + |
1406 | prot->tail_size, | |
1407 | tls_ctx->rx.rec_seq, prot->rec_seq_size, | |
1408 | ctx->control, prot->version); | |
0b243d00 VG |
1409 | |
1410 | /* Prepare sgin */ | |
1411 | sg_init_table(sgin, n_sgin); | |
4509de14 | 1412 | sg_set_buf(&sgin[0], aad, prot->aad_size); |
0b243d00 | 1413 | err = skb_to_sgvec(skb, &sgin[1], |
4509de14 VG |
1414 | rxm->offset + prot->prepend_size, |
1415 | rxm->full_len - prot->prepend_size); | |
0b243d00 VG |
1416 | if (err < 0) { |
1417 | kfree(mem); | |
1418 | return err; | |
1419 | } | |
1420 | ||
1421 | if (n_sgout) { | |
1422 | if (out_iov) { | |
1423 | sg_init_table(sgout, n_sgout); | |
4509de14 | 1424 | sg_set_buf(&sgout[0], aad, prot->aad_size); |
0b243d00 VG |
1425 | |
1426 | *chunk = 0; | |
d829e9c4 DB |
1427 | err = tls_setup_from_iter(sk, out_iov, data_len, |
1428 | &pages, chunk, &sgout[1], | |
1429 | (n_sgout - 1)); | |
0b243d00 VG |
1430 | if (err < 0) |
1431 | goto fallback_to_reg_recv; | |
1432 | } else if (out_sg) { | |
1433 | memcpy(sgout, out_sg, n_sgout * sizeof(*sgout)); | |
1434 | } else { | |
1435 | goto fallback_to_reg_recv; | |
1436 | } | |
1437 | } else { | |
1438 | fallback_to_reg_recv: | |
1439 | sgout = sgin; | |
1440 | pages = 0; | |
692d7b5d | 1441 | *chunk = data_len; |
0b243d00 VG |
1442 | *zc = false; |
1443 | } | |
1444 | ||
1445 | /* Prepare and submit AEAD request */ | |
94524d8f | 1446 | err = tls_do_decryption(sk, skb, sgin, sgout, iv, |
692d7b5d | 1447 | data_len, aead_req, async); |
94524d8f VG |
1448 | if (err == -EINPROGRESS) |
1449 | return err; | |
0b243d00 VG |
1450 | |
1451 | /* Release the pages in case iov was mapped to pages */ | |
1452 | for (; pages > 0; pages--) | |
1453 | put_page(sg_page(&sgout[pages])); | |
1454 | ||
1455 | kfree(mem); | |
1456 | return err; | |
1457 | } | |
1458 | ||
dafb67f3 | 1459 | static int decrypt_skb_update(struct sock *sk, struct sk_buff *skb, |
692d7b5d VG |
1460 | struct iov_iter *dest, int *chunk, bool *zc, |
1461 | bool async) | |
dafb67f3 BP |
1462 | { |
1463 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
1464 | struct tls_sw_context_rx *ctx = tls_sw_ctx_rx(tls_ctx); | |
4509de14 VG |
1465 | struct tls_prot_info *prot = &tls_ctx->prot_info; |
1466 | int version = prot->version; | |
dafb67f3 BP |
1467 | struct strp_msg *rxm = strp_msg(skb); |
1468 | int err = 0; | |
1469 | ||
4799ac81 BP |
1470 | #ifdef CONFIG_TLS_DEVICE |
1471 | err = tls_device_decrypted(sk, skb); | |
dafb67f3 BP |
1472 | if (err < 0) |
1473 | return err; | |
4799ac81 BP |
1474 | #endif |
1475 | if (!ctx->decrypted) { | |
692d7b5d | 1476 | err = decrypt_internal(sk, skb, dest, NULL, chunk, zc, async); |
94524d8f VG |
1477 | if (err < 0) { |
1478 | if (err == -EINPROGRESS) | |
130b392c DW |
1479 | tls_advance_record_sn(sk, &tls_ctx->rx, |
1480 | version); | |
94524d8f | 1481 | |
4799ac81 | 1482 | return err; |
94524d8f | 1483 | } |
130b392c DW |
1484 | |
1485 | rxm->full_len -= padding_length(ctx, tls_ctx, skb); | |
1486 | ||
4509de14 VG |
1487 | rxm->offset += prot->prepend_size; |
1488 | rxm->full_len -= prot->overhead_size; | |
130b392c | 1489 | tls_advance_record_sn(sk, &tls_ctx->rx, version); |
fedf201e DW |
1490 | ctx->decrypted = true; |
1491 | ctx->saved_data_ready(sk); | |
4799ac81 BP |
1492 | } else { |
1493 | *zc = false; | |
1494 | } | |
dafb67f3 | 1495 | |
dafb67f3 BP |
1496 | return err; |
1497 | } | |
1498 | ||
1499 | int decrypt_skb(struct sock *sk, struct sk_buff *skb, | |
1500 | struct scatterlist *sgout) | |
c46234eb | 1501 | { |
0b243d00 VG |
1502 | bool zc = true; |
1503 | int chunk; | |
c46234eb | 1504 | |
692d7b5d | 1505 | return decrypt_internal(sk, skb, NULL, sgout, &chunk, &zc, false); |
c46234eb DW |
1506 | } |
1507 | ||
1508 | static bool tls_sw_advance_skb(struct sock *sk, struct sk_buff *skb, | |
1509 | unsigned int len) | |
1510 | { | |
1511 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
f66de3ee | 1512 | struct tls_sw_context_rx *ctx = tls_sw_ctx_rx(tls_ctx); |
c46234eb | 1513 | |
94524d8f VG |
1514 | if (skb) { |
1515 | struct strp_msg *rxm = strp_msg(skb); | |
c46234eb | 1516 | |
94524d8f VG |
1517 | if (len < rxm->full_len) { |
1518 | rxm->offset += len; | |
1519 | rxm->full_len -= len; | |
1520 | return false; | |
1521 | } | |
1522 | kfree_skb(skb); | |
c46234eb DW |
1523 | } |
1524 | ||
1525 | /* Finished with message */ | |
1526 | ctx->recv_pkt = NULL; | |
7170e604 | 1527 | __strp_unpause(&ctx->strp); |
c46234eb DW |
1528 | |
1529 | return true; | |
1530 | } | |
1531 | ||
692d7b5d | 1532 | /* This function traverses the rx_list in tls receive context to copies the |
2b794c40 | 1533 | * decrypted records into the buffer provided by caller zero copy is not |
692d7b5d VG |
1534 | * true. Further, the records are removed from the rx_list if it is not a peek |
1535 | * case and the record has been consumed completely. | |
1536 | */ | |
1537 | static int process_rx_list(struct tls_sw_context_rx *ctx, | |
1538 | struct msghdr *msg, | |
2b794c40 VG |
1539 | u8 *control, |
1540 | bool *cmsg, | |
692d7b5d VG |
1541 | size_t skip, |
1542 | size_t len, | |
1543 | bool zc, | |
1544 | bool is_peek) | |
1545 | { | |
1546 | struct sk_buff *skb = skb_peek(&ctx->rx_list); | |
2b794c40 VG |
1547 | u8 ctrl = *control; |
1548 | u8 msgc = *cmsg; | |
1549 | struct tls_msg *tlm; | |
692d7b5d VG |
1550 | ssize_t copied = 0; |
1551 | ||
2b794c40 VG |
1552 | /* Set the record type in 'control' if caller didn't pass it */ |
1553 | if (!ctrl && skb) { | |
1554 | tlm = tls_msg(skb); | |
1555 | ctrl = tlm->control; | |
1556 | } | |
1557 | ||
692d7b5d VG |
1558 | while (skip && skb) { |
1559 | struct strp_msg *rxm = strp_msg(skb); | |
2b794c40 VG |
1560 | tlm = tls_msg(skb); |
1561 | ||
1562 | /* Cannot process a record of different type */ | |
1563 | if (ctrl != tlm->control) | |
1564 | return 0; | |
692d7b5d VG |
1565 | |
1566 | if (skip < rxm->full_len) | |
1567 | break; | |
1568 | ||
1569 | skip = skip - rxm->full_len; | |
1570 | skb = skb_peek_next(skb, &ctx->rx_list); | |
1571 | } | |
1572 | ||
1573 | while (len && skb) { | |
1574 | struct sk_buff *next_skb; | |
1575 | struct strp_msg *rxm = strp_msg(skb); | |
1576 | int chunk = min_t(unsigned int, rxm->full_len - skip, len); | |
1577 | ||
2b794c40 VG |
1578 | tlm = tls_msg(skb); |
1579 | ||
1580 | /* Cannot process a record of different type */ | |
1581 | if (ctrl != tlm->control) | |
1582 | return 0; | |
1583 | ||
1584 | /* Set record type if not already done. For a non-data record, | |
1585 | * do not proceed if record type could not be copied. | |
1586 | */ | |
1587 | if (!msgc) { | |
1588 | int cerr = put_cmsg(msg, SOL_TLS, TLS_GET_RECORD_TYPE, | |
1589 | sizeof(ctrl), &ctrl); | |
1590 | msgc = true; | |
1591 | if (ctrl != TLS_RECORD_TYPE_DATA) { | |
1592 | if (cerr || msg->msg_flags & MSG_CTRUNC) | |
1593 | return -EIO; | |
1594 | ||
1595 | *cmsg = msgc; | |
1596 | } | |
1597 | } | |
1598 | ||
692d7b5d VG |
1599 | if (!zc || (rxm->full_len - skip) > len) { |
1600 | int err = skb_copy_datagram_msg(skb, rxm->offset + skip, | |
1601 | msg, chunk); | |
1602 | if (err < 0) | |
1603 | return err; | |
1604 | } | |
1605 | ||
1606 | len = len - chunk; | |
1607 | copied = copied + chunk; | |
1608 | ||
1609 | /* Consume the data from record if it is non-peek case*/ | |
1610 | if (!is_peek) { | |
1611 | rxm->offset = rxm->offset + chunk; | |
1612 | rxm->full_len = rxm->full_len - chunk; | |
1613 | ||
1614 | /* Return if there is unconsumed data in the record */ | |
1615 | if (rxm->full_len - skip) | |
1616 | break; | |
1617 | } | |
1618 | ||
1619 | /* The remaining skip-bytes must lie in 1st record in rx_list. | |
1620 | * So from the 2nd record, 'skip' should be 0. | |
1621 | */ | |
1622 | skip = 0; | |
1623 | ||
1624 | if (msg) | |
1625 | msg->msg_flags |= MSG_EOR; | |
1626 | ||
1627 | next_skb = skb_peek_next(skb, &ctx->rx_list); | |
1628 | ||
1629 | if (!is_peek) { | |
1630 | skb_unlink(skb, &ctx->rx_list); | |
1631 | kfree_skb(skb); | |
1632 | } | |
1633 | ||
1634 | skb = next_skb; | |
1635 | } | |
1636 | ||
2b794c40 | 1637 | *control = ctrl; |
692d7b5d VG |
1638 | return copied; |
1639 | } | |
1640 | ||
c46234eb DW |
1641 | int tls_sw_recvmsg(struct sock *sk, |
1642 | struct msghdr *msg, | |
1643 | size_t len, | |
1644 | int nonblock, | |
1645 | int flags, | |
1646 | int *addr_len) | |
1647 | { | |
1648 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
f66de3ee | 1649 | struct tls_sw_context_rx *ctx = tls_sw_ctx_rx(tls_ctx); |
4509de14 | 1650 | struct tls_prot_info *prot = &tls_ctx->prot_info; |
d3b18ad3 | 1651 | struct sk_psock *psock; |
692d7b5d VG |
1652 | unsigned char control = 0; |
1653 | ssize_t decrypted = 0; | |
c46234eb | 1654 | struct strp_msg *rxm; |
2b794c40 | 1655 | struct tls_msg *tlm; |
c46234eb DW |
1656 | struct sk_buff *skb; |
1657 | ssize_t copied = 0; | |
1658 | bool cmsg = false; | |
06030dba | 1659 | int target, err = 0; |
c46234eb | 1660 | long timeo; |
00e23707 | 1661 | bool is_kvec = iov_iter_is_kvec(&msg->msg_iter); |
692d7b5d | 1662 | bool is_peek = flags & MSG_PEEK; |
94524d8f | 1663 | int num_async = 0; |
c46234eb DW |
1664 | |
1665 | flags |= nonblock; | |
1666 | ||
1667 | if (unlikely(flags & MSG_ERRQUEUE)) | |
1668 | return sock_recv_errqueue(sk, msg, len, SOL_IP, IP_RECVERR); | |
1669 | ||
d3b18ad3 | 1670 | psock = sk_psock_get(sk); |
c46234eb DW |
1671 | lock_sock(sk); |
1672 | ||
692d7b5d | 1673 | /* Process pending decrypted records. It must be non-zero-copy */ |
2b794c40 VG |
1674 | err = process_rx_list(ctx, msg, &control, &cmsg, 0, len, false, |
1675 | is_peek); | |
692d7b5d VG |
1676 | if (err < 0) { |
1677 | tls_err_abort(sk, err); | |
1678 | goto end; | |
1679 | } else { | |
1680 | copied = err; | |
1681 | } | |
1682 | ||
1683 | len = len - copied; | |
1684 | if (len) { | |
1685 | target = sock_rcvlowat(sk, flags & MSG_WAITALL, len); | |
1686 | timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT); | |
1687 | } else { | |
1688 | goto recv_end; | |
1689 | } | |
1690 | ||
c46234eb | 1691 | do { |
692d7b5d | 1692 | bool retain_skb = false; |
692d7b5d VG |
1693 | bool zc = false; |
1694 | int to_decrypt; | |
c46234eb | 1695 | int chunk = 0; |
c0ab4732 | 1696 | bool async; |
c46234eb | 1697 | |
d3b18ad3 JF |
1698 | skb = tls_wait_data(sk, psock, flags, timeo, &err); |
1699 | if (!skb) { | |
1700 | if (psock) { | |
02c558b2 JF |
1701 | int ret = __tcp_bpf_recvmsg(sk, psock, |
1702 | msg, len, flags); | |
d3b18ad3 JF |
1703 | |
1704 | if (ret > 0) { | |
692d7b5d | 1705 | decrypted += ret; |
d3b18ad3 JF |
1706 | len -= ret; |
1707 | continue; | |
1708 | } | |
1709 | } | |
c46234eb | 1710 | goto recv_end; |
2b794c40 VG |
1711 | } else { |
1712 | tlm = tls_msg(skb); | |
1713 | if (prot->version == TLS_1_3_VERSION) | |
1714 | tlm->control = 0; | |
1715 | else | |
1716 | tlm->control = ctx->control; | |
d3b18ad3 | 1717 | } |
c46234eb DW |
1718 | |
1719 | rxm = strp_msg(skb); | |
94524d8f | 1720 | |
4509de14 | 1721 | to_decrypt = rxm->full_len - prot->overhead_size; |
fedf201e DW |
1722 | |
1723 | if (to_decrypt <= len && !is_kvec && !is_peek && | |
130b392c | 1724 | ctx->control == TLS_RECORD_TYPE_DATA && |
4509de14 | 1725 | prot->version != TLS_1_3_VERSION) |
fedf201e DW |
1726 | zc = true; |
1727 | ||
c0ab4732 VG |
1728 | /* Do not use async mode if record is non-data */ |
1729 | if (ctx->control == TLS_RECORD_TYPE_DATA) | |
1730 | async = ctx->async_capable; | |
1731 | else | |
1732 | async = false; | |
1733 | ||
fedf201e | 1734 | err = decrypt_skb_update(sk, skb, &msg->msg_iter, |
c0ab4732 | 1735 | &chunk, &zc, async); |
fedf201e DW |
1736 | if (err < 0 && err != -EINPROGRESS) { |
1737 | tls_err_abort(sk, EBADMSG); | |
1738 | goto recv_end; | |
1739 | } | |
1740 | ||
c0ab4732 | 1741 | if (err == -EINPROGRESS) |
fedf201e | 1742 | num_async++; |
2b794c40 VG |
1743 | else if (prot->version == TLS_1_3_VERSION) |
1744 | tlm->control = ctx->control; | |
1745 | ||
1746 | /* If the type of records being processed is not known yet, | |
1747 | * set it to record type just dequeued. If it is already known, | |
1748 | * but does not match the record type just dequeued, go to end. | |
1749 | * We always get record type here since for tls1.2, record type | |
1750 | * is known just after record is dequeued from stream parser. | |
1751 | * For tls1.3, we disable async. | |
1752 | */ | |
1753 | ||
1754 | if (!control) | |
1755 | control = tlm->control; | |
1756 | else if (control != tlm->control) | |
1757 | goto recv_end; | |
fedf201e | 1758 | |
c46234eb DW |
1759 | if (!cmsg) { |
1760 | int cerr; | |
1761 | ||
1762 | cerr = put_cmsg(msg, SOL_TLS, TLS_GET_RECORD_TYPE, | |
2b794c40 | 1763 | sizeof(control), &control); |
c46234eb | 1764 | cmsg = true; |
2b794c40 | 1765 | if (control != TLS_RECORD_TYPE_DATA) { |
c46234eb DW |
1766 | if (cerr || msg->msg_flags & MSG_CTRUNC) { |
1767 | err = -EIO; | |
1768 | goto recv_end; | |
1769 | } | |
1770 | } | |
c46234eb DW |
1771 | } |
1772 | ||
c0ab4732 VG |
1773 | if (async) |
1774 | goto pick_next_record; | |
1775 | ||
fedf201e DW |
1776 | if (!zc) { |
1777 | if (rxm->full_len > len) { | |
1778 | retain_skb = true; | |
1779 | chunk = len; | |
1780 | } else { | |
1781 | chunk = rxm->full_len; | |
1782 | } | |
692d7b5d | 1783 | |
fedf201e DW |
1784 | err = skb_copy_datagram_msg(skb, rxm->offset, |
1785 | msg, chunk); | |
1786 | if (err < 0) | |
1787 | goto recv_end; | |
94524d8f | 1788 | |
fedf201e DW |
1789 | if (!is_peek) { |
1790 | rxm->offset = rxm->offset + chunk; | |
1791 | rxm->full_len = rxm->full_len - chunk; | |
692d7b5d | 1792 | } |
c46234eb DW |
1793 | } |
1794 | ||
94524d8f | 1795 | pick_next_record: |
692d7b5d VG |
1796 | if (chunk > len) |
1797 | chunk = len; | |
1798 | ||
1799 | decrypted += chunk; | |
c46234eb | 1800 | len -= chunk; |
692d7b5d VG |
1801 | |
1802 | /* For async or peek case, queue the current skb */ | |
1803 | if (async || is_peek || retain_skb) { | |
1804 | skb_queue_tail(&ctx->rx_list, skb); | |
1805 | skb = NULL; | |
1806 | } | |
1807 | ||
1808 | if (tls_sw_advance_skb(sk, skb, chunk)) { | |
1809 | /* Return full control message to | |
1810 | * userspace before trying to parse | |
1811 | * another message type | |
50c6b58a | 1812 | */ |
692d7b5d VG |
1813 | msg->msg_flags |= MSG_EOR; |
1814 | if (ctx->control != TLS_RECORD_TYPE_DATA) | |
1815 | goto recv_end; | |
1816 | } else { | |
50c6b58a | 1817 | break; |
c46234eb | 1818 | } |
94524d8f | 1819 | |
06030dba | 1820 | /* If we have a new message from strparser, continue now. */ |
692d7b5d | 1821 | if (decrypted >= target && !ctx->recv_pkt) |
06030dba | 1822 | break; |
c46234eb DW |
1823 | } while (len); |
1824 | ||
1825 | recv_end: | |
94524d8f VG |
1826 | if (num_async) { |
1827 | /* Wait for all previously submitted records to be decrypted */ | |
1828 | smp_store_mb(ctx->async_notify, true); | |
1829 | if (atomic_read(&ctx->decrypt_pending)) { | |
1830 | err = crypto_wait_req(-EINPROGRESS, &ctx->async_wait); | |
1831 | if (err) { | |
1832 | /* one of async decrypt failed */ | |
1833 | tls_err_abort(sk, err); | |
1834 | copied = 0; | |
692d7b5d VG |
1835 | decrypted = 0; |
1836 | goto end; | |
94524d8f VG |
1837 | } |
1838 | } else { | |
1839 | reinit_completion(&ctx->async_wait.completion); | |
1840 | } | |
1841 | WRITE_ONCE(ctx->async_notify, false); | |
692d7b5d VG |
1842 | |
1843 | /* Drain records from the rx_list & copy if required */ | |
1844 | if (is_peek || is_kvec) | |
2b794c40 | 1845 | err = process_rx_list(ctx, msg, &control, &cmsg, copied, |
692d7b5d VG |
1846 | decrypted, false, is_peek); |
1847 | else | |
2b794c40 | 1848 | err = process_rx_list(ctx, msg, &control, &cmsg, 0, |
692d7b5d VG |
1849 | decrypted, true, is_peek); |
1850 | if (err < 0) { | |
1851 | tls_err_abort(sk, err); | |
1852 | copied = 0; | |
1853 | goto end; | |
1854 | } | |
94524d8f VG |
1855 | } |
1856 | ||
692d7b5d VG |
1857 | copied += decrypted; |
1858 | ||
1859 | end: | |
c46234eb | 1860 | release_sock(sk); |
d3b18ad3 JF |
1861 | if (psock) |
1862 | sk_psock_put(sk, psock); | |
c46234eb DW |
1863 | return copied ? : err; |
1864 | } | |
1865 | ||
1866 | ssize_t tls_sw_splice_read(struct socket *sock, loff_t *ppos, | |
1867 | struct pipe_inode_info *pipe, | |
1868 | size_t len, unsigned int flags) | |
1869 | { | |
1870 | struct tls_context *tls_ctx = tls_get_ctx(sock->sk); | |
f66de3ee | 1871 | struct tls_sw_context_rx *ctx = tls_sw_ctx_rx(tls_ctx); |
c46234eb DW |
1872 | struct strp_msg *rxm = NULL; |
1873 | struct sock *sk = sock->sk; | |
1874 | struct sk_buff *skb; | |
1875 | ssize_t copied = 0; | |
1876 | int err = 0; | |
1877 | long timeo; | |
1878 | int chunk; | |
0b243d00 | 1879 | bool zc = false; |
c46234eb DW |
1880 | |
1881 | lock_sock(sk); | |
1882 | ||
1883 | timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT); | |
1884 | ||
d3b18ad3 | 1885 | skb = tls_wait_data(sk, NULL, flags, timeo, &err); |
c46234eb DW |
1886 | if (!skb) |
1887 | goto splice_read_end; | |
1888 | ||
c46234eb | 1889 | if (!ctx->decrypted) { |
692d7b5d | 1890 | err = decrypt_skb_update(sk, skb, NULL, &chunk, &zc, false); |
c46234eb | 1891 | |
fedf201e DW |
1892 | /* splice does not support reading control messages */ |
1893 | if (ctx->control != TLS_RECORD_TYPE_DATA) { | |
1894 | err = -ENOTSUPP; | |
1895 | goto splice_read_end; | |
1896 | } | |
1897 | ||
c46234eb DW |
1898 | if (err < 0) { |
1899 | tls_err_abort(sk, EBADMSG); | |
1900 | goto splice_read_end; | |
1901 | } | |
1902 | ctx->decrypted = true; | |
1903 | } | |
1904 | rxm = strp_msg(skb); | |
1905 | ||
1906 | chunk = min_t(unsigned int, rxm->full_len, len); | |
1907 | copied = skb_splice_bits(skb, sk, rxm->offset, pipe, chunk, flags); | |
1908 | if (copied < 0) | |
1909 | goto splice_read_end; | |
1910 | ||
1911 | if (likely(!(flags & MSG_PEEK))) | |
1912 | tls_sw_advance_skb(sk, skb, copied); | |
1913 | ||
1914 | splice_read_end: | |
1915 | release_sock(sk); | |
1916 | return copied ? : err; | |
1917 | } | |
1918 | ||
924ad65e | 1919 | bool tls_sw_stream_read(const struct sock *sk) |
c46234eb | 1920 | { |
c46234eb | 1921 | struct tls_context *tls_ctx = tls_get_ctx(sk); |
f66de3ee | 1922 | struct tls_sw_context_rx *ctx = tls_sw_ctx_rx(tls_ctx); |
d3b18ad3 JF |
1923 | bool ingress_empty = true; |
1924 | struct sk_psock *psock; | |
c46234eb | 1925 | |
d3b18ad3 JF |
1926 | rcu_read_lock(); |
1927 | psock = sk_psock(sk); | |
1928 | if (psock) | |
1929 | ingress_empty = list_empty(&psock->ingress_msg); | |
1930 | rcu_read_unlock(); | |
c46234eb | 1931 | |
d3b18ad3 | 1932 | return !ingress_empty || ctx->recv_pkt; |
c46234eb DW |
1933 | } |
1934 | ||
1935 | static int tls_read_size(struct strparser *strp, struct sk_buff *skb) | |
1936 | { | |
1937 | struct tls_context *tls_ctx = tls_get_ctx(strp->sk); | |
f66de3ee | 1938 | struct tls_sw_context_rx *ctx = tls_sw_ctx_rx(tls_ctx); |
4509de14 | 1939 | struct tls_prot_info *prot = &tls_ctx->prot_info; |
3463e51d | 1940 | char header[TLS_HEADER_SIZE + MAX_IV_SIZE]; |
c46234eb DW |
1941 | struct strp_msg *rxm = strp_msg(skb); |
1942 | size_t cipher_overhead; | |
1943 | size_t data_len = 0; | |
1944 | int ret; | |
1945 | ||
1946 | /* Verify that we have a full TLS header, or wait for more data */ | |
4509de14 | 1947 | if (rxm->offset + prot->prepend_size > skb->len) |
c46234eb DW |
1948 | return 0; |
1949 | ||
3463e51d | 1950 | /* Sanity-check size of on-stack buffer. */ |
4509de14 | 1951 | if (WARN_ON(prot->prepend_size > sizeof(header))) { |
3463e51d KC |
1952 | ret = -EINVAL; |
1953 | goto read_failure; | |
1954 | } | |
1955 | ||
c46234eb | 1956 | /* Linearize header to local buffer */ |
4509de14 | 1957 | ret = skb_copy_bits(skb, rxm->offset, header, prot->prepend_size); |
c46234eb DW |
1958 | |
1959 | if (ret < 0) | |
1960 | goto read_failure; | |
1961 | ||
1962 | ctx->control = header[0]; | |
1963 | ||
1964 | data_len = ((header[4] & 0xFF) | (header[3] << 8)); | |
1965 | ||
4509de14 VG |
1966 | cipher_overhead = prot->tag_size; |
1967 | if (prot->version != TLS_1_3_VERSION) | |
1968 | cipher_overhead += prot->iv_size; | |
c46234eb | 1969 | |
130b392c | 1970 | if (data_len > TLS_MAX_PAYLOAD_SIZE + cipher_overhead + |
4509de14 | 1971 | prot->tail_size) { |
c46234eb DW |
1972 | ret = -EMSGSIZE; |
1973 | goto read_failure; | |
1974 | } | |
1975 | if (data_len < cipher_overhead) { | |
1976 | ret = -EBADMSG; | |
1977 | goto read_failure; | |
1978 | } | |
1979 | ||
130b392c DW |
1980 | /* Note that both TLS1.3 and TLS1.2 use TLS_1_2 version here */ |
1981 | if (header[1] != TLS_1_2_VERSION_MINOR || | |
1982 | header[2] != TLS_1_2_VERSION_MAJOR) { | |
c46234eb DW |
1983 | ret = -EINVAL; |
1984 | goto read_failure; | |
1985 | } | |
4799ac81 BP |
1986 | #ifdef CONFIG_TLS_DEVICE |
1987 | handle_device_resync(strp->sk, TCP_SKB_CB(skb)->seq + rxm->offset, | |
1988 | *(u64*)tls_ctx->rx.rec_seq); | |
1989 | #endif | |
c46234eb DW |
1990 | return data_len + TLS_HEADER_SIZE; |
1991 | ||
1992 | read_failure: | |
1993 | tls_err_abort(strp->sk, ret); | |
1994 | ||
1995 | return ret; | |
1996 | } | |
1997 | ||
1998 | static void tls_queue(struct strparser *strp, struct sk_buff *skb) | |
1999 | { | |
2000 | struct tls_context *tls_ctx = tls_get_ctx(strp->sk); | |
f66de3ee | 2001 | struct tls_sw_context_rx *ctx = tls_sw_ctx_rx(tls_ctx); |
c46234eb DW |
2002 | |
2003 | ctx->decrypted = false; | |
2004 | ||
2005 | ctx->recv_pkt = skb; | |
2006 | strp_pause(strp); | |
2007 | ||
ad13acce | 2008 | ctx->saved_data_ready(strp->sk); |
c46234eb DW |
2009 | } |
2010 | ||
2011 | static void tls_data_ready(struct sock *sk) | |
2012 | { | |
2013 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
f66de3ee | 2014 | struct tls_sw_context_rx *ctx = tls_sw_ctx_rx(tls_ctx); |
d3b18ad3 | 2015 | struct sk_psock *psock; |
c46234eb DW |
2016 | |
2017 | strp_data_ready(&ctx->strp); | |
d3b18ad3 JF |
2018 | |
2019 | psock = sk_psock_get(sk); | |
2020 | if (psock && !list_empty(&psock->ingress_msg)) { | |
2021 | ctx->saved_data_ready(sk); | |
2022 | sk_psock_put(sk, psock); | |
2023 | } | |
c46234eb DW |
2024 | } |
2025 | ||
f66de3ee | 2026 | void tls_sw_free_resources_tx(struct sock *sk) |
3c4d7559 DW |
2027 | { |
2028 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
f66de3ee | 2029 | struct tls_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx); |
a42055e8 VG |
2030 | struct tls_rec *rec, *tmp; |
2031 | ||
2032 | /* Wait for any pending async encryptions to complete */ | |
2033 | smp_store_mb(ctx->async_notify, true); | |
2034 | if (atomic_read(&ctx->encrypt_pending)) | |
2035 | crypto_wait_req(-EINPROGRESS, &ctx->async_wait); | |
2036 | ||
10231213 | 2037 | release_sock(sk); |
a42055e8 | 2038 | cancel_delayed_work_sync(&ctx->tx_work.work); |
10231213 | 2039 | lock_sock(sk); |
a42055e8 VG |
2040 | |
2041 | /* Tx whatever records we can transmit and abandon the rest */ | |
2042 | tls_tx_records(sk, -1); | |
2043 | ||
9932a29a | 2044 | /* Free up un-sent records in tx_list. First, free |
a42055e8 VG |
2045 | * the partially sent record if any at head of tx_list. |
2046 | */ | |
2047 | if (tls_ctx->partially_sent_record) { | |
2048 | struct scatterlist *sg = tls_ctx->partially_sent_record; | |
2049 | ||
2050 | while (1) { | |
2051 | put_page(sg_page(sg)); | |
2052 | sk_mem_uncharge(sk, sg->length); | |
2053 | ||
2054 | if (sg_is_last(sg)) | |
2055 | break; | |
2056 | sg++; | |
2057 | } | |
2058 | ||
2059 | tls_ctx->partially_sent_record = NULL; | |
2060 | ||
9932a29a | 2061 | rec = list_first_entry(&ctx->tx_list, |
a42055e8 VG |
2062 | struct tls_rec, list); |
2063 | list_del(&rec->list); | |
d829e9c4 | 2064 | sk_msg_free(sk, &rec->msg_plaintext); |
a42055e8 VG |
2065 | kfree(rec); |
2066 | } | |
2067 | ||
9932a29a | 2068 | list_for_each_entry_safe(rec, tmp, &ctx->tx_list, list) { |
a42055e8 | 2069 | list_del(&rec->list); |
d829e9c4 DB |
2070 | sk_msg_free(sk, &rec->msg_encrypted); |
2071 | sk_msg_free(sk, &rec->msg_plaintext); | |
a42055e8 VG |
2072 | kfree(rec); |
2073 | } | |
3c4d7559 | 2074 | |
201876b3 | 2075 | crypto_free_aead(ctx->aead_send); |
c774973e | 2076 | tls_free_open_rec(sk); |
f66de3ee BP |
2077 | |
2078 | kfree(ctx); | |
2079 | } | |
2080 | ||
39f56e1a | 2081 | void tls_sw_release_resources_rx(struct sock *sk) |
f66de3ee BP |
2082 | { |
2083 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
2084 | struct tls_sw_context_rx *ctx = tls_sw_ctx_rx(tls_ctx); | |
2085 | ||
c46234eb | 2086 | if (ctx->aead_recv) { |
201876b3 VG |
2087 | kfree_skb(ctx->recv_pkt); |
2088 | ctx->recv_pkt = NULL; | |
692d7b5d | 2089 | skb_queue_purge(&ctx->rx_list); |
c46234eb DW |
2090 | crypto_free_aead(ctx->aead_recv); |
2091 | strp_stop(&ctx->strp); | |
2092 | write_lock_bh(&sk->sk_callback_lock); | |
2093 | sk->sk_data_ready = ctx->saved_data_ready; | |
2094 | write_unlock_bh(&sk->sk_callback_lock); | |
2095 | release_sock(sk); | |
2096 | strp_done(&ctx->strp); | |
2097 | lock_sock(sk); | |
2098 | } | |
39f56e1a BP |
2099 | } |
2100 | ||
2101 | void tls_sw_free_resources_rx(struct sock *sk) | |
2102 | { | |
2103 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
2104 | struct tls_sw_context_rx *ctx = tls_sw_ctx_rx(tls_ctx); | |
2105 | ||
2106 | tls_sw_release_resources_rx(sk); | |
3c4d7559 | 2107 | |
3c4d7559 DW |
2108 | kfree(ctx); |
2109 | } | |
2110 | ||
9932a29a | 2111 | /* The work handler to transmitt the encrypted records in tx_list */ |
a42055e8 VG |
2112 | static void tx_work_handler(struct work_struct *work) |
2113 | { | |
2114 | struct delayed_work *delayed_work = to_delayed_work(work); | |
2115 | struct tx_work *tx_work = container_of(delayed_work, | |
2116 | struct tx_work, work); | |
2117 | struct sock *sk = tx_work->sk; | |
2118 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
2119 | struct tls_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx); | |
2120 | ||
2121 | if (!test_and_clear_bit(BIT_TX_SCHEDULED, &ctx->tx_bitmask)) | |
2122 | return; | |
2123 | ||
2124 | lock_sock(sk); | |
2125 | tls_tx_records(sk, -1); | |
2126 | release_sock(sk); | |
2127 | } | |
2128 | ||
7463d3a2 BP |
2129 | void tls_sw_write_space(struct sock *sk, struct tls_context *ctx) |
2130 | { | |
2131 | struct tls_sw_context_tx *tx_ctx = tls_sw_ctx_tx(ctx); | |
2132 | ||
2133 | /* Schedule the transmission if tx list is ready */ | |
2134 | if (is_tx_ready(tx_ctx) && !sk->sk_write_pending) { | |
2135 | /* Schedule the transmission */ | |
2136 | if (!test_and_set_bit(BIT_TX_SCHEDULED, | |
2137 | &tx_ctx->tx_bitmask)) | |
2138 | schedule_delayed_work(&tx_ctx->tx_work.work, 0); | |
2139 | } | |
2140 | } | |
2141 | ||
c46234eb | 2142 | int tls_set_sw_offload(struct sock *sk, struct tls_context *ctx, int tx) |
3c4d7559 | 2143 | { |
4509de14 VG |
2144 | struct tls_context *tls_ctx = tls_get_ctx(sk); |
2145 | struct tls_prot_info *prot = &tls_ctx->prot_info; | |
3c4d7559 DW |
2146 | struct tls_crypto_info *crypto_info; |
2147 | struct tls12_crypto_info_aes_gcm_128 *gcm_128_info; | |
fb99bce7 | 2148 | struct tls12_crypto_info_aes_gcm_256 *gcm_256_info; |
f66de3ee BP |
2149 | struct tls_sw_context_tx *sw_ctx_tx = NULL; |
2150 | struct tls_sw_context_rx *sw_ctx_rx = NULL; | |
c46234eb DW |
2151 | struct cipher_context *cctx; |
2152 | struct crypto_aead **aead; | |
2153 | struct strp_callbacks cb; | |
3c4d7559 | 2154 | u16 nonce_size, tag_size, iv_size, rec_seq_size; |
692d7b5d | 2155 | struct crypto_tfm *tfm; |
fb99bce7 DW |
2156 | char *iv, *rec_seq, *key, *salt; |
2157 | size_t keysize; | |
3c4d7559 DW |
2158 | int rc = 0; |
2159 | ||
2160 | if (!ctx) { | |
2161 | rc = -EINVAL; | |
2162 | goto out; | |
2163 | } | |
2164 | ||
f66de3ee | 2165 | if (tx) { |
b190a587 BP |
2166 | if (!ctx->priv_ctx_tx) { |
2167 | sw_ctx_tx = kzalloc(sizeof(*sw_ctx_tx), GFP_KERNEL); | |
2168 | if (!sw_ctx_tx) { | |
2169 | rc = -ENOMEM; | |
2170 | goto out; | |
2171 | } | |
2172 | ctx->priv_ctx_tx = sw_ctx_tx; | |
2173 | } else { | |
2174 | sw_ctx_tx = | |
2175 | (struct tls_sw_context_tx *)ctx->priv_ctx_tx; | |
c46234eb | 2176 | } |
c46234eb | 2177 | } else { |
b190a587 BP |
2178 | if (!ctx->priv_ctx_rx) { |
2179 | sw_ctx_rx = kzalloc(sizeof(*sw_ctx_rx), GFP_KERNEL); | |
2180 | if (!sw_ctx_rx) { | |
2181 | rc = -ENOMEM; | |
2182 | goto out; | |
2183 | } | |
2184 | ctx->priv_ctx_rx = sw_ctx_rx; | |
2185 | } else { | |
2186 | sw_ctx_rx = | |
2187 | (struct tls_sw_context_rx *)ctx->priv_ctx_rx; | |
f66de3ee | 2188 | } |
3c4d7559 DW |
2189 | } |
2190 | ||
c46234eb | 2191 | if (tx) { |
b190a587 | 2192 | crypto_init_wait(&sw_ctx_tx->async_wait); |
86029d10 | 2193 | crypto_info = &ctx->crypto_send.info; |
c46234eb | 2194 | cctx = &ctx->tx; |
f66de3ee | 2195 | aead = &sw_ctx_tx->aead_send; |
9932a29a | 2196 | INIT_LIST_HEAD(&sw_ctx_tx->tx_list); |
a42055e8 VG |
2197 | INIT_DELAYED_WORK(&sw_ctx_tx->tx_work.work, tx_work_handler); |
2198 | sw_ctx_tx->tx_work.sk = sk; | |
c46234eb | 2199 | } else { |
b190a587 | 2200 | crypto_init_wait(&sw_ctx_rx->async_wait); |
86029d10 | 2201 | crypto_info = &ctx->crypto_recv.info; |
c46234eb | 2202 | cctx = &ctx->rx; |
692d7b5d | 2203 | skb_queue_head_init(&sw_ctx_rx->rx_list); |
f66de3ee | 2204 | aead = &sw_ctx_rx->aead_recv; |
c46234eb DW |
2205 | } |
2206 | ||
3c4d7559 DW |
2207 | switch (crypto_info->cipher_type) { |
2208 | case TLS_CIPHER_AES_GCM_128: { | |
2209 | nonce_size = TLS_CIPHER_AES_GCM_128_IV_SIZE; | |
2210 | tag_size = TLS_CIPHER_AES_GCM_128_TAG_SIZE; | |
2211 | iv_size = TLS_CIPHER_AES_GCM_128_IV_SIZE; | |
2212 | iv = ((struct tls12_crypto_info_aes_gcm_128 *)crypto_info)->iv; | |
2213 | rec_seq_size = TLS_CIPHER_AES_GCM_128_REC_SEQ_SIZE; | |
2214 | rec_seq = | |
2215 | ((struct tls12_crypto_info_aes_gcm_128 *)crypto_info)->rec_seq; | |
2216 | gcm_128_info = | |
2217 | (struct tls12_crypto_info_aes_gcm_128 *)crypto_info; | |
fb99bce7 DW |
2218 | keysize = TLS_CIPHER_AES_GCM_128_KEY_SIZE; |
2219 | key = gcm_128_info->key; | |
2220 | salt = gcm_128_info->salt; | |
2221 | break; | |
2222 | } | |
2223 | case TLS_CIPHER_AES_GCM_256: { | |
2224 | nonce_size = TLS_CIPHER_AES_GCM_256_IV_SIZE; | |
2225 | tag_size = TLS_CIPHER_AES_GCM_256_TAG_SIZE; | |
2226 | iv_size = TLS_CIPHER_AES_GCM_256_IV_SIZE; | |
2227 | iv = ((struct tls12_crypto_info_aes_gcm_256 *)crypto_info)->iv; | |
2228 | rec_seq_size = TLS_CIPHER_AES_GCM_256_REC_SEQ_SIZE; | |
2229 | rec_seq = | |
2230 | ((struct tls12_crypto_info_aes_gcm_256 *)crypto_info)->rec_seq; | |
2231 | gcm_256_info = | |
2232 | (struct tls12_crypto_info_aes_gcm_256 *)crypto_info; | |
2233 | keysize = TLS_CIPHER_AES_GCM_256_KEY_SIZE; | |
2234 | key = gcm_256_info->key; | |
2235 | salt = gcm_256_info->salt; | |
3c4d7559 DW |
2236 | break; |
2237 | } | |
2238 | default: | |
2239 | rc = -EINVAL; | |
cf6d43ef | 2240 | goto free_priv; |
3c4d7559 DW |
2241 | } |
2242 | ||
b16520f7 | 2243 | /* Sanity-check the IV size for stack allocations. */ |
3463e51d | 2244 | if (iv_size > MAX_IV_SIZE || nonce_size > MAX_IV_SIZE) { |
b16520f7 KC |
2245 | rc = -EINVAL; |
2246 | goto free_priv; | |
2247 | } | |
2248 | ||
130b392c DW |
2249 | if (crypto_info->version == TLS_1_3_VERSION) { |
2250 | nonce_size = 0; | |
4509de14 VG |
2251 | prot->aad_size = TLS_HEADER_SIZE; |
2252 | prot->tail_size = 1; | |
130b392c | 2253 | } else { |
4509de14 VG |
2254 | prot->aad_size = TLS_AAD_SPACE_SIZE; |
2255 | prot->tail_size = 0; | |
130b392c DW |
2256 | } |
2257 | ||
4509de14 VG |
2258 | prot->version = crypto_info->version; |
2259 | prot->cipher_type = crypto_info->cipher_type; | |
2260 | prot->prepend_size = TLS_HEADER_SIZE + nonce_size; | |
2261 | prot->tag_size = tag_size; | |
2262 | prot->overhead_size = prot->prepend_size + | |
2263 | prot->tag_size + prot->tail_size; | |
2264 | prot->iv_size = iv_size; | |
c46234eb DW |
2265 | cctx->iv = kmalloc(iv_size + TLS_CIPHER_AES_GCM_128_SALT_SIZE, |
2266 | GFP_KERNEL); | |
2267 | if (!cctx->iv) { | |
3c4d7559 | 2268 | rc = -ENOMEM; |
cf6d43ef | 2269 | goto free_priv; |
3c4d7559 | 2270 | } |
fb99bce7 DW |
2271 | /* Note: 128 & 256 bit salt are the same size */ |
2272 | memcpy(cctx->iv, salt, TLS_CIPHER_AES_GCM_128_SALT_SIZE); | |
c46234eb | 2273 | memcpy(cctx->iv + TLS_CIPHER_AES_GCM_128_SALT_SIZE, iv, iv_size); |
4509de14 | 2274 | prot->rec_seq_size = rec_seq_size; |
969d5090 | 2275 | cctx->rec_seq = kmemdup(rec_seq, rec_seq_size, GFP_KERNEL); |
c46234eb | 2276 | if (!cctx->rec_seq) { |
3c4d7559 DW |
2277 | rc = -ENOMEM; |
2278 | goto free_iv; | |
2279 | } | |
c46234eb | 2280 | |
c46234eb DW |
2281 | if (!*aead) { |
2282 | *aead = crypto_alloc_aead("gcm(aes)", 0, 0); | |
2283 | if (IS_ERR(*aead)) { | |
2284 | rc = PTR_ERR(*aead); | |
2285 | *aead = NULL; | |
3c4d7559 DW |
2286 | goto free_rec_seq; |
2287 | } | |
2288 | } | |
2289 | ||
2290 | ctx->push_pending_record = tls_sw_push_pending_record; | |
2291 | ||
fb99bce7 DW |
2292 | rc = crypto_aead_setkey(*aead, key, keysize); |
2293 | ||
3c4d7559 DW |
2294 | if (rc) |
2295 | goto free_aead; | |
2296 | ||
4509de14 | 2297 | rc = crypto_aead_setauthsize(*aead, prot->tag_size); |
c46234eb DW |
2298 | if (rc) |
2299 | goto free_aead; | |
2300 | ||
f66de3ee | 2301 | if (sw_ctx_rx) { |
692d7b5d | 2302 | tfm = crypto_aead_tfm(sw_ctx_rx->aead_recv); |
8497ded2 VG |
2303 | |
2304 | if (crypto_info->version == TLS_1_3_VERSION) | |
2305 | sw_ctx_rx->async_capable = false; | |
2306 | else | |
2307 | sw_ctx_rx->async_capable = | |
2308 | tfm->__crt_alg->cra_flags & CRYPTO_ALG_ASYNC; | |
692d7b5d | 2309 | |
c46234eb DW |
2310 | /* Set up strparser */ |
2311 | memset(&cb, 0, sizeof(cb)); | |
2312 | cb.rcv_msg = tls_queue; | |
2313 | cb.parse_msg = tls_read_size; | |
2314 | ||
f66de3ee | 2315 | strp_init(&sw_ctx_rx->strp, sk, &cb); |
c46234eb DW |
2316 | |
2317 | write_lock_bh(&sk->sk_callback_lock); | |
f66de3ee | 2318 | sw_ctx_rx->saved_data_ready = sk->sk_data_ready; |
c46234eb DW |
2319 | sk->sk_data_ready = tls_data_ready; |
2320 | write_unlock_bh(&sk->sk_callback_lock); | |
2321 | ||
f66de3ee | 2322 | strp_check_rcv(&sw_ctx_rx->strp); |
c46234eb DW |
2323 | } |
2324 | ||
2325 | goto out; | |
3c4d7559 DW |
2326 | |
2327 | free_aead: | |
c46234eb DW |
2328 | crypto_free_aead(*aead); |
2329 | *aead = NULL; | |
3c4d7559 | 2330 | free_rec_seq: |
c46234eb DW |
2331 | kfree(cctx->rec_seq); |
2332 | cctx->rec_seq = NULL; | |
3c4d7559 | 2333 | free_iv: |
f66de3ee BP |
2334 | kfree(cctx->iv); |
2335 | cctx->iv = NULL; | |
cf6d43ef | 2336 | free_priv: |
f66de3ee BP |
2337 | if (tx) { |
2338 | kfree(ctx->priv_ctx_tx); | |
2339 | ctx->priv_ctx_tx = NULL; | |
2340 | } else { | |
2341 | kfree(ctx->priv_ctx_rx); | |
2342 | ctx->priv_ctx_rx = NULL; | |
2343 | } | |
3c4d7559 DW |
2344 | out: |
2345 | return rc; | |
2346 | } |