Commit | Line | Data |
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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 | * 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 | ||
0927f71d DRK |
45 | static int __skb_nsg(struct sk_buff *skb, int offset, int len, |
46 | unsigned int recursion_level) | |
47 | { | |
48 | int start = skb_headlen(skb); | |
49 | int i, chunk = start - offset; | |
50 | struct sk_buff *frag_iter; | |
51 | int elt = 0; | |
52 | ||
53 | if (unlikely(recursion_level >= 24)) | |
54 | return -EMSGSIZE; | |
55 | ||
56 | if (chunk > 0) { | |
57 | if (chunk > len) | |
58 | chunk = len; | |
59 | elt++; | |
60 | len -= chunk; | |
61 | if (len == 0) | |
62 | return elt; | |
63 | offset += chunk; | |
64 | } | |
65 | ||
66 | for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) { | |
67 | int end; | |
68 | ||
69 | WARN_ON(start > offset + len); | |
70 | ||
71 | end = start + skb_frag_size(&skb_shinfo(skb)->frags[i]); | |
72 | chunk = end - offset; | |
73 | if (chunk > 0) { | |
74 | if (chunk > len) | |
75 | chunk = len; | |
76 | elt++; | |
77 | len -= chunk; | |
78 | if (len == 0) | |
79 | return elt; | |
80 | offset += chunk; | |
81 | } | |
82 | start = end; | |
83 | } | |
84 | ||
85 | if (unlikely(skb_has_frag_list(skb))) { | |
86 | skb_walk_frags(skb, frag_iter) { | |
87 | int end, ret; | |
88 | ||
89 | WARN_ON(start > offset + len); | |
90 | ||
91 | end = start + frag_iter->len; | |
92 | chunk = end - offset; | |
93 | if (chunk > 0) { | |
94 | if (chunk > len) | |
95 | chunk = len; | |
96 | ret = __skb_nsg(frag_iter, offset - start, chunk, | |
97 | recursion_level + 1); | |
98 | if (unlikely(ret < 0)) | |
99 | return ret; | |
100 | elt += ret; | |
101 | len -= chunk; | |
102 | if (len == 0) | |
103 | return elt; | |
104 | offset += chunk; | |
105 | } | |
106 | start = end; | |
107 | } | |
108 | } | |
109 | BUG_ON(len); | |
110 | return elt; | |
111 | } | |
112 | ||
113 | /* Return the number of scatterlist elements required to completely map the | |
114 | * skb, or -EMSGSIZE if the recursion depth is exceeded. | |
115 | */ | |
116 | static int skb_nsg(struct sk_buff *skb, int offset, int len) | |
117 | { | |
118 | return __skb_nsg(skb, offset, len, 0); | |
119 | } | |
120 | ||
130b392c | 121 | static int padding_length(struct tls_sw_context_rx *ctx, |
b53f4976 | 122 | struct tls_prot_info *prot, struct sk_buff *skb) |
130b392c DW |
123 | { |
124 | struct strp_msg *rxm = strp_msg(skb); | |
125 | int sub = 0; | |
126 | ||
127 | /* Determine zero-padding length */ | |
b53f4976 | 128 | if (prot->version == TLS_1_3_VERSION) { |
130b392c DW |
129 | char content_type = 0; |
130 | int err; | |
131 | int back = 17; | |
132 | ||
133 | while (content_type == 0) { | |
b53f4976 | 134 | if (back > rxm->full_len - prot->prepend_size) |
130b392c DW |
135 | return -EBADMSG; |
136 | err = skb_copy_bits(skb, | |
137 | rxm->offset + rxm->full_len - back, | |
138 | &content_type, 1); | |
b53f4976 JK |
139 | if (err) |
140 | return err; | |
130b392c DW |
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); | |
b53f4976 JK |
175 | int pad; |
176 | ||
177 | pad = padding_length(ctx, prot, skb); | |
178 | if (pad < 0) { | |
179 | ctx->async_wait.err = pad; | |
180 | tls_err_abort(skb->sk, pad); | |
181 | } else { | |
182 | rxm->full_len -= pad; | |
183 | rxm->offset += prot->prepend_size; | |
184 | rxm->full_len -= prot->overhead_size; | |
185 | } | |
94524d8f VG |
186 | } |
187 | ||
7a3dd8c8 JF |
188 | /* After using skb->sk to propagate sk through crypto async callback |
189 | * we need to NULL it again. | |
190 | */ | |
191 | skb->sk = NULL; | |
192 | ||
94524d8f | 193 | |
692d7b5d VG |
194 | /* Free the destination pages if skb was not decrypted inplace */ |
195 | if (sgout != sgin) { | |
196 | /* Skip the first S/G entry as it points to AAD */ | |
197 | for_each_sg(sg_next(sgout), sg, UINT_MAX, pages) { | |
198 | if (!sg) | |
199 | break; | |
200 | put_page(sg_page(sg)); | |
201 | } | |
94524d8f VG |
202 | } |
203 | ||
204 | kfree(aead_req); | |
205 | ||
692d7b5d VG |
206 | pending = atomic_dec_return(&ctx->decrypt_pending); |
207 | ||
94524d8f VG |
208 | if (!pending && READ_ONCE(ctx->async_notify)) |
209 | complete(&ctx->async_wait.completion); | |
210 | } | |
211 | ||
c46234eb | 212 | static int tls_do_decryption(struct sock *sk, |
94524d8f | 213 | struct sk_buff *skb, |
c46234eb DW |
214 | struct scatterlist *sgin, |
215 | struct scatterlist *sgout, | |
216 | char *iv_recv, | |
217 | size_t data_len, | |
94524d8f VG |
218 | struct aead_request *aead_req, |
219 | bool async) | |
c46234eb DW |
220 | { |
221 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
4509de14 | 222 | struct tls_prot_info *prot = &tls_ctx->prot_info; |
f66de3ee | 223 | struct tls_sw_context_rx *ctx = tls_sw_ctx_rx(tls_ctx); |
c46234eb | 224 | int ret; |
c46234eb | 225 | |
0b243d00 | 226 | aead_request_set_tfm(aead_req, ctx->aead_recv); |
4509de14 | 227 | aead_request_set_ad(aead_req, prot->aad_size); |
c46234eb | 228 | aead_request_set_crypt(aead_req, sgin, sgout, |
4509de14 | 229 | data_len + prot->tag_size, |
c46234eb | 230 | (u8 *)iv_recv); |
c46234eb | 231 | |
94524d8f | 232 | if (async) { |
7a3dd8c8 JF |
233 | /* Using skb->sk to push sk through to crypto async callback |
234 | * handler. This allows propagating errors up to the socket | |
235 | * if needed. It _must_ be cleared in the async handler | |
a88c26f6 | 236 | * before consume_skb is called. We _know_ skb->sk is NULL |
7a3dd8c8 JF |
237 | * because it is a clone from strparser. |
238 | */ | |
239 | skb->sk = sk; | |
94524d8f VG |
240 | aead_request_set_callback(aead_req, |
241 | CRYPTO_TFM_REQ_MAY_BACKLOG, | |
242 | tls_decrypt_done, skb); | |
243 | atomic_inc(&ctx->decrypt_pending); | |
244 | } else { | |
245 | aead_request_set_callback(aead_req, | |
246 | CRYPTO_TFM_REQ_MAY_BACKLOG, | |
247 | crypto_req_done, &ctx->async_wait); | |
248 | } | |
249 | ||
250 | ret = crypto_aead_decrypt(aead_req); | |
251 | if (ret == -EINPROGRESS) { | |
252 | if (async) | |
253 | return ret; | |
254 | ||
255 | ret = crypto_wait_req(ret, &ctx->async_wait); | |
256 | } | |
257 | ||
258 | if (async) | |
259 | atomic_dec(&ctx->decrypt_pending); | |
260 | ||
c46234eb DW |
261 | return ret; |
262 | } | |
263 | ||
d829e9c4 | 264 | static void tls_trim_both_msgs(struct sock *sk, int target_size) |
3c4d7559 DW |
265 | { |
266 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
4509de14 | 267 | struct tls_prot_info *prot = &tls_ctx->prot_info; |
f66de3ee | 268 | struct tls_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx); |
a42055e8 | 269 | struct tls_rec *rec = ctx->open_rec; |
3c4d7559 | 270 | |
d829e9c4 | 271 | sk_msg_trim(sk, &rec->msg_plaintext, target_size); |
3c4d7559 | 272 | if (target_size > 0) |
4509de14 | 273 | target_size += prot->overhead_size; |
d829e9c4 | 274 | sk_msg_trim(sk, &rec->msg_encrypted, target_size); |
3c4d7559 DW |
275 | } |
276 | ||
d829e9c4 | 277 | static int tls_alloc_encrypted_msg(struct sock *sk, int len) |
3c4d7559 DW |
278 | { |
279 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
f66de3ee | 280 | struct tls_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx); |
a42055e8 | 281 | struct tls_rec *rec = ctx->open_rec; |
d829e9c4 | 282 | struct sk_msg *msg_en = &rec->msg_encrypted; |
3c4d7559 | 283 | |
d829e9c4 | 284 | return sk_msg_alloc(sk, msg_en, len, 0); |
3c4d7559 DW |
285 | } |
286 | ||
d829e9c4 | 287 | static int tls_clone_plaintext_msg(struct sock *sk, int required) |
3c4d7559 DW |
288 | { |
289 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
4509de14 | 290 | struct tls_prot_info *prot = &tls_ctx->prot_info; |
f66de3ee | 291 | struct tls_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx); |
a42055e8 | 292 | struct tls_rec *rec = ctx->open_rec; |
d829e9c4 DB |
293 | struct sk_msg *msg_pl = &rec->msg_plaintext; |
294 | struct sk_msg *msg_en = &rec->msg_encrypted; | |
4e6d4720 | 295 | int skip, len; |
3c4d7559 | 296 | |
d829e9c4 DB |
297 | /* We add page references worth len bytes from encrypted sg |
298 | * at the end of plaintext sg. It is guaranteed that msg_en | |
4e6d4720 VG |
299 | * has enough required room (ensured by caller). |
300 | */ | |
d829e9c4 | 301 | len = required - msg_pl->sg.size; |
52ea992c | 302 | |
d829e9c4 DB |
303 | /* Skip initial bytes in msg_en's data to be able to use |
304 | * same offset of both plain and encrypted data. | |
4e6d4720 | 305 | */ |
4509de14 | 306 | skip = prot->prepend_size + msg_pl->sg.size; |
4e6d4720 | 307 | |
d829e9c4 | 308 | return sk_msg_clone(sk, msg_pl, msg_en, skip, len); |
3c4d7559 DW |
309 | } |
310 | ||
d3b18ad3 | 311 | static struct tls_rec *tls_get_rec(struct sock *sk) |
3c4d7559 DW |
312 | { |
313 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
4509de14 | 314 | struct tls_prot_info *prot = &tls_ctx->prot_info; |
f66de3ee | 315 | struct tls_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx); |
d3b18ad3 JF |
316 | struct sk_msg *msg_pl, *msg_en; |
317 | struct tls_rec *rec; | |
318 | int mem_size; | |
3c4d7559 | 319 | |
d3b18ad3 JF |
320 | mem_size = sizeof(struct tls_rec) + crypto_aead_reqsize(ctx->aead_send); |
321 | ||
322 | rec = kzalloc(mem_size, sk->sk_allocation); | |
a42055e8 | 323 | if (!rec) |
d3b18ad3 JF |
324 | return NULL; |
325 | ||
326 | msg_pl = &rec->msg_plaintext; | |
327 | msg_en = &rec->msg_encrypted; | |
328 | ||
329 | sk_msg_init(msg_pl); | |
330 | sk_msg_init(msg_en); | |
331 | ||
332 | sg_init_table(rec->sg_aead_in, 2); | |
4509de14 | 333 | sg_set_buf(&rec->sg_aead_in[0], rec->aad_space, prot->aad_size); |
d3b18ad3 JF |
334 | sg_unmark_end(&rec->sg_aead_in[1]); |
335 | ||
336 | sg_init_table(rec->sg_aead_out, 2); | |
4509de14 | 337 | sg_set_buf(&rec->sg_aead_out[0], rec->aad_space, prot->aad_size); |
d3b18ad3 JF |
338 | sg_unmark_end(&rec->sg_aead_out[1]); |
339 | ||
340 | return rec; | |
341 | } | |
a42055e8 | 342 | |
d3b18ad3 JF |
343 | static void tls_free_rec(struct sock *sk, struct tls_rec *rec) |
344 | { | |
d829e9c4 DB |
345 | sk_msg_free(sk, &rec->msg_encrypted); |
346 | sk_msg_free(sk, &rec->msg_plaintext); | |
c774973e | 347 | kfree(rec); |
a42055e8 VG |
348 | } |
349 | ||
d3b18ad3 JF |
350 | static void tls_free_open_rec(struct sock *sk) |
351 | { | |
352 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
353 | struct tls_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx); | |
354 | struct tls_rec *rec = ctx->open_rec; | |
355 | ||
356 | if (rec) { | |
357 | tls_free_rec(sk, rec); | |
358 | ctx->open_rec = NULL; | |
359 | } | |
360 | } | |
361 | ||
a42055e8 VG |
362 | int tls_tx_records(struct sock *sk, int flags) |
363 | { | |
364 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
365 | struct tls_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx); | |
366 | struct tls_rec *rec, *tmp; | |
d829e9c4 | 367 | struct sk_msg *msg_en; |
a42055e8 VG |
368 | int tx_flags, rc = 0; |
369 | ||
370 | if (tls_is_partially_sent_record(tls_ctx)) { | |
9932a29a | 371 | rec = list_first_entry(&ctx->tx_list, |
a42055e8 VG |
372 | struct tls_rec, list); |
373 | ||
374 | if (flags == -1) | |
375 | tx_flags = rec->tx_flags; | |
376 | else | |
377 | tx_flags = flags; | |
378 | ||
379 | rc = tls_push_partial_record(sk, tls_ctx, tx_flags); | |
380 | if (rc) | |
381 | goto tx_err; | |
382 | ||
383 | /* Full record has been transmitted. | |
9932a29a | 384 | * Remove the head of tx_list |
a42055e8 | 385 | */ |
a42055e8 | 386 | list_del(&rec->list); |
d829e9c4 | 387 | sk_msg_free(sk, &rec->msg_plaintext); |
a42055e8 VG |
388 | kfree(rec); |
389 | } | |
390 | ||
9932a29a VG |
391 | /* Tx all ready records */ |
392 | list_for_each_entry_safe(rec, tmp, &ctx->tx_list, list) { | |
393 | if (READ_ONCE(rec->tx_ready)) { | |
a42055e8 VG |
394 | if (flags == -1) |
395 | tx_flags = rec->tx_flags; | |
396 | else | |
397 | tx_flags = flags; | |
398 | ||
d829e9c4 | 399 | msg_en = &rec->msg_encrypted; |
a42055e8 | 400 | rc = tls_push_sg(sk, tls_ctx, |
d829e9c4 | 401 | &msg_en->sg.data[msg_en->sg.curr], |
a42055e8 VG |
402 | 0, tx_flags); |
403 | if (rc) | |
404 | goto tx_err; | |
405 | ||
a42055e8 | 406 | list_del(&rec->list); |
d829e9c4 | 407 | sk_msg_free(sk, &rec->msg_plaintext); |
a42055e8 VG |
408 | kfree(rec); |
409 | } else { | |
410 | break; | |
411 | } | |
412 | } | |
413 | ||
414 | tx_err: | |
415 | if (rc < 0 && rc != -EAGAIN) | |
416 | tls_err_abort(sk, EBADMSG); | |
417 | ||
418 | return rc; | |
419 | } | |
420 | ||
421 | static void tls_encrypt_done(struct crypto_async_request *req, int err) | |
422 | { | |
423 | struct aead_request *aead_req = (struct aead_request *)req; | |
424 | struct sock *sk = req->data; | |
425 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
4509de14 | 426 | struct tls_prot_info *prot = &tls_ctx->prot_info; |
a42055e8 | 427 | struct tls_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx); |
d829e9c4 DB |
428 | struct scatterlist *sge; |
429 | struct sk_msg *msg_en; | |
a42055e8 VG |
430 | struct tls_rec *rec; |
431 | bool ready = false; | |
432 | int pending; | |
433 | ||
434 | rec = container_of(aead_req, struct tls_rec, aead_req); | |
d829e9c4 | 435 | msg_en = &rec->msg_encrypted; |
a42055e8 | 436 | |
d829e9c4 | 437 | sge = sk_msg_elem(msg_en, msg_en->sg.curr); |
4509de14 VG |
438 | sge->offset -= prot->prepend_size; |
439 | sge->length += prot->prepend_size; | |
a42055e8 | 440 | |
80ece6a0 | 441 | /* Check if error is previously set on socket */ |
a42055e8 | 442 | if (err || sk->sk_err) { |
a42055e8 VG |
443 | rec = NULL; |
444 | ||
445 | /* If err is already set on socket, return the same code */ | |
446 | if (sk->sk_err) { | |
447 | ctx->async_wait.err = sk->sk_err; | |
448 | } else { | |
449 | ctx->async_wait.err = err; | |
450 | tls_err_abort(sk, err); | |
451 | } | |
452 | } | |
453 | ||
9932a29a VG |
454 | if (rec) { |
455 | struct tls_rec *first_rec; | |
456 | ||
457 | /* Mark the record as ready for transmission */ | |
458 | smp_store_mb(rec->tx_ready, true); | |
459 | ||
460 | /* If received record is at head of tx_list, schedule tx */ | |
461 | first_rec = list_first_entry(&ctx->tx_list, | |
462 | struct tls_rec, list); | |
463 | if (rec == first_rec) | |
464 | ready = true; | |
465 | } | |
a42055e8 VG |
466 | |
467 | pending = atomic_dec_return(&ctx->encrypt_pending); | |
468 | ||
469 | if (!pending && READ_ONCE(ctx->async_notify)) | |
470 | complete(&ctx->async_wait.completion); | |
471 | ||
472 | if (!ready) | |
473 | return; | |
474 | ||
475 | /* Schedule the transmission */ | |
476 | if (!test_and_set_bit(BIT_TX_SCHEDULED, &ctx->tx_bitmask)) | |
d829e9c4 | 477 | schedule_delayed_work(&ctx->tx_work.work, 1); |
3c4d7559 DW |
478 | } |
479 | ||
a42055e8 VG |
480 | static int tls_do_encryption(struct sock *sk, |
481 | struct tls_context *tls_ctx, | |
a447da7d DB |
482 | struct tls_sw_context_tx *ctx, |
483 | struct aead_request *aead_req, | |
d829e9c4 | 484 | size_t data_len, u32 start) |
3c4d7559 | 485 | { |
4509de14 | 486 | struct tls_prot_info *prot = &tls_ctx->prot_info; |
a42055e8 | 487 | struct tls_rec *rec = ctx->open_rec; |
d829e9c4 DB |
488 | struct sk_msg *msg_en = &rec->msg_encrypted; |
489 | struct scatterlist *sge = sk_msg_elem(msg_en, start); | |
f295b3ae VG |
490 | int rc, iv_offset = 0; |
491 | ||
492 | /* For CCM based ciphers, first byte of IV is a constant */ | |
493 | if (prot->cipher_type == TLS_CIPHER_AES_CCM_128) { | |
494 | rec->iv_data[0] = TLS_AES_CCM_IV_B0_BYTE; | |
495 | iv_offset = 1; | |
496 | } | |
497 | ||
498 | memcpy(&rec->iv_data[iv_offset], tls_ctx->tx.iv, | |
499 | prot->iv_size + prot->salt_size); | |
3c4d7559 | 500 | |
f295b3ae | 501 | xor_iv_with_seq(prot->version, rec->iv_data, tls_ctx->tx.rec_seq); |
32eb67b9 | 502 | |
4509de14 VG |
503 | sge->offset += prot->prepend_size; |
504 | sge->length -= prot->prepend_size; | |
3c4d7559 | 505 | |
d829e9c4 | 506 | msg_en->sg.curr = start; |
4e6d4720 | 507 | |
3c4d7559 | 508 | aead_request_set_tfm(aead_req, ctx->aead_send); |
4509de14 | 509 | aead_request_set_ad(aead_req, prot->aad_size); |
d829e9c4 DB |
510 | aead_request_set_crypt(aead_req, rec->sg_aead_in, |
511 | rec->sg_aead_out, | |
32eb67b9 | 512 | data_len, rec->iv_data); |
a54667f6 VG |
513 | |
514 | aead_request_set_callback(aead_req, CRYPTO_TFM_REQ_MAY_BACKLOG, | |
a42055e8 VG |
515 | tls_encrypt_done, sk); |
516 | ||
9932a29a VG |
517 | /* Add the record in tx_list */ |
518 | list_add_tail((struct list_head *)&rec->list, &ctx->tx_list); | |
a42055e8 | 519 | atomic_inc(&ctx->encrypt_pending); |
a54667f6 | 520 | |
a42055e8 VG |
521 | rc = crypto_aead_encrypt(aead_req); |
522 | if (!rc || rc != -EINPROGRESS) { | |
523 | atomic_dec(&ctx->encrypt_pending); | |
4509de14 VG |
524 | sge->offset -= prot->prepend_size; |
525 | sge->length += prot->prepend_size; | |
a42055e8 | 526 | } |
3c4d7559 | 527 | |
9932a29a VG |
528 | if (!rc) { |
529 | WRITE_ONCE(rec->tx_ready, true); | |
530 | } else if (rc != -EINPROGRESS) { | |
531 | list_del(&rec->list); | |
a42055e8 | 532 | return rc; |
9932a29a | 533 | } |
3c4d7559 | 534 | |
a42055e8 VG |
535 | /* Unhook the record from context if encryption is not failure */ |
536 | ctx->open_rec = NULL; | |
fb0f886f | 537 | tls_advance_record_sn(sk, prot, &tls_ctx->tx); |
3c4d7559 DW |
538 | return rc; |
539 | } | |
540 | ||
d3b18ad3 JF |
541 | static int tls_split_open_record(struct sock *sk, struct tls_rec *from, |
542 | struct tls_rec **to, struct sk_msg *msg_opl, | |
543 | struct sk_msg *msg_oen, u32 split_point, | |
544 | u32 tx_overhead_size, u32 *orig_end) | |
545 | { | |
546 | u32 i, j, bytes = 0, apply = msg_opl->apply_bytes; | |
547 | struct scatterlist *sge, *osge, *nsge; | |
548 | u32 orig_size = msg_opl->sg.size; | |
549 | struct scatterlist tmp = { }; | |
550 | struct sk_msg *msg_npl; | |
551 | struct tls_rec *new; | |
552 | int ret; | |
553 | ||
554 | new = tls_get_rec(sk); | |
555 | if (!new) | |
556 | return -ENOMEM; | |
557 | ret = sk_msg_alloc(sk, &new->msg_encrypted, msg_opl->sg.size + | |
558 | tx_overhead_size, 0); | |
559 | if (ret < 0) { | |
560 | tls_free_rec(sk, new); | |
561 | return ret; | |
562 | } | |
563 | ||
564 | *orig_end = msg_opl->sg.end; | |
565 | i = msg_opl->sg.start; | |
566 | sge = sk_msg_elem(msg_opl, i); | |
567 | while (apply && sge->length) { | |
568 | if (sge->length > apply) { | |
569 | u32 len = sge->length - apply; | |
570 | ||
571 | get_page(sg_page(sge)); | |
572 | sg_set_page(&tmp, sg_page(sge), len, | |
573 | sge->offset + apply); | |
574 | sge->length = apply; | |
575 | bytes += apply; | |
576 | apply = 0; | |
577 | } else { | |
578 | apply -= sge->length; | |
579 | bytes += sge->length; | |
580 | } | |
581 | ||
582 | sk_msg_iter_var_next(i); | |
583 | if (i == msg_opl->sg.end) | |
584 | break; | |
585 | sge = sk_msg_elem(msg_opl, i); | |
586 | } | |
587 | ||
588 | msg_opl->sg.end = i; | |
589 | msg_opl->sg.curr = i; | |
590 | msg_opl->sg.copybreak = 0; | |
591 | msg_opl->apply_bytes = 0; | |
592 | msg_opl->sg.size = bytes; | |
593 | ||
594 | msg_npl = &new->msg_plaintext; | |
595 | msg_npl->apply_bytes = apply; | |
596 | msg_npl->sg.size = orig_size - bytes; | |
597 | ||
598 | j = msg_npl->sg.start; | |
599 | nsge = sk_msg_elem(msg_npl, j); | |
600 | if (tmp.length) { | |
601 | memcpy(nsge, &tmp, sizeof(*nsge)); | |
602 | sk_msg_iter_var_next(j); | |
603 | nsge = sk_msg_elem(msg_npl, j); | |
604 | } | |
605 | ||
606 | osge = sk_msg_elem(msg_opl, i); | |
607 | while (osge->length) { | |
608 | memcpy(nsge, osge, sizeof(*nsge)); | |
609 | sg_unmark_end(nsge); | |
610 | sk_msg_iter_var_next(i); | |
611 | sk_msg_iter_var_next(j); | |
612 | if (i == *orig_end) | |
613 | break; | |
614 | osge = sk_msg_elem(msg_opl, i); | |
615 | nsge = sk_msg_elem(msg_npl, j); | |
616 | } | |
617 | ||
618 | msg_npl->sg.end = j; | |
619 | msg_npl->sg.curr = j; | |
620 | msg_npl->sg.copybreak = 0; | |
621 | ||
622 | *to = new; | |
623 | return 0; | |
624 | } | |
625 | ||
626 | static void tls_merge_open_record(struct sock *sk, struct tls_rec *to, | |
627 | struct tls_rec *from, u32 orig_end) | |
628 | { | |
629 | struct sk_msg *msg_npl = &from->msg_plaintext; | |
630 | struct sk_msg *msg_opl = &to->msg_plaintext; | |
631 | struct scatterlist *osge, *nsge; | |
632 | u32 i, j; | |
633 | ||
634 | i = msg_opl->sg.end; | |
635 | sk_msg_iter_var_prev(i); | |
636 | j = msg_npl->sg.start; | |
637 | ||
638 | osge = sk_msg_elem(msg_opl, i); | |
639 | nsge = sk_msg_elem(msg_npl, j); | |
640 | ||
641 | if (sg_page(osge) == sg_page(nsge) && | |
642 | osge->offset + osge->length == nsge->offset) { | |
643 | osge->length += nsge->length; | |
644 | put_page(sg_page(nsge)); | |
645 | } | |
646 | ||
647 | msg_opl->sg.end = orig_end; | |
648 | msg_opl->sg.curr = orig_end; | |
649 | msg_opl->sg.copybreak = 0; | |
650 | msg_opl->apply_bytes = msg_opl->sg.size + msg_npl->sg.size; | |
651 | msg_opl->sg.size += msg_npl->sg.size; | |
652 | ||
653 | sk_msg_free(sk, &to->msg_encrypted); | |
654 | sk_msg_xfer_full(&to->msg_encrypted, &from->msg_encrypted); | |
655 | ||
656 | kfree(from); | |
657 | } | |
658 | ||
3c4d7559 DW |
659 | static int tls_push_record(struct sock *sk, int flags, |
660 | unsigned char record_type) | |
661 | { | |
662 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
4509de14 | 663 | struct tls_prot_info *prot = &tls_ctx->prot_info; |
f66de3ee | 664 | struct tls_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx); |
d3b18ad3 JF |
665 | struct tls_rec *rec = ctx->open_rec, *tmp = NULL; |
666 | u32 i, split_point, uninitialized_var(orig_end); | |
d829e9c4 | 667 | struct sk_msg *msg_pl, *msg_en; |
a447da7d | 668 | struct aead_request *req; |
d3b18ad3 | 669 | bool split; |
3c4d7559 DW |
670 | int rc; |
671 | ||
a42055e8 VG |
672 | if (!rec) |
673 | return 0; | |
a447da7d | 674 | |
d829e9c4 DB |
675 | msg_pl = &rec->msg_plaintext; |
676 | msg_en = &rec->msg_encrypted; | |
677 | ||
d3b18ad3 JF |
678 | split_point = msg_pl->apply_bytes; |
679 | split = split_point && split_point < msg_pl->sg.size; | |
680 | if (split) { | |
681 | rc = tls_split_open_record(sk, rec, &tmp, msg_pl, msg_en, | |
4509de14 | 682 | split_point, prot->overhead_size, |
d3b18ad3 JF |
683 | &orig_end); |
684 | if (rc < 0) | |
685 | return rc; | |
686 | sk_msg_trim(sk, msg_en, msg_pl->sg.size + | |
4509de14 | 687 | prot->overhead_size); |
d3b18ad3 JF |
688 | } |
689 | ||
a42055e8 VG |
690 | rec->tx_flags = flags; |
691 | req = &rec->aead_req; | |
3c4d7559 | 692 | |
d829e9c4 DB |
693 | i = msg_pl->sg.end; |
694 | sk_msg_iter_var_prev(i); | |
130b392c DW |
695 | |
696 | rec->content_type = record_type; | |
4509de14 | 697 | if (prot->version == TLS_1_3_VERSION) { |
130b392c DW |
698 | /* Add content type to end of message. No padding added */ |
699 | sg_set_buf(&rec->sg_content_type, &rec->content_type, 1); | |
700 | sg_mark_end(&rec->sg_content_type); | |
701 | sg_chain(msg_pl->sg.data, msg_pl->sg.end + 1, | |
702 | &rec->sg_content_type); | |
703 | } else { | |
704 | sg_mark_end(sk_msg_elem(msg_pl, i)); | |
705 | } | |
a42055e8 | 706 | |
d829e9c4 DB |
707 | i = msg_pl->sg.start; |
708 | sg_chain(rec->sg_aead_in, 2, rec->inplace_crypto ? | |
709 | &msg_en->sg.data[i] : &msg_pl->sg.data[i]); | |
710 | ||
711 | i = msg_en->sg.end; | |
712 | sk_msg_iter_var_prev(i); | |
713 | sg_mark_end(sk_msg_elem(msg_en, i)); | |
714 | ||
715 | i = msg_en->sg.start; | |
716 | sg_chain(rec->sg_aead_out, 2, &msg_en->sg.data[i]); | |
717 | ||
4509de14 VG |
718 | tls_make_aad(rec->aad_space, msg_pl->sg.size + prot->tail_size, |
719 | tls_ctx->tx.rec_seq, prot->rec_seq_size, | |
720 | record_type, prot->version); | |
3c4d7559 DW |
721 | |
722 | tls_fill_prepend(tls_ctx, | |
d829e9c4 | 723 | page_address(sg_page(&msg_en->sg.data[i])) + |
130b392c | 724 | msg_en->sg.data[i].offset, |
4509de14 VG |
725 | msg_pl->sg.size + prot->tail_size, |
726 | record_type, prot->version); | |
3c4d7559 | 727 | |
d829e9c4 | 728 | tls_ctx->pending_open_record_frags = false; |
3c4d7559 | 729 | |
130b392c | 730 | rc = tls_do_encryption(sk, tls_ctx, ctx, req, |
4509de14 | 731 | msg_pl->sg.size + prot->tail_size, i); |
a42055e8 | 732 | if (rc < 0) { |
d3b18ad3 | 733 | if (rc != -EINPROGRESS) { |
d829e9c4 | 734 | tls_err_abort(sk, EBADMSG); |
d3b18ad3 JF |
735 | if (split) { |
736 | tls_ctx->pending_open_record_frags = true; | |
737 | tls_merge_open_record(sk, rec, tmp, orig_end); | |
738 | } | |
739 | } | |
5b053e12 | 740 | ctx->async_capable = 1; |
a42055e8 | 741 | return rc; |
d3b18ad3 JF |
742 | } else if (split) { |
743 | msg_pl = &tmp->msg_plaintext; | |
744 | msg_en = &tmp->msg_encrypted; | |
4509de14 | 745 | sk_msg_trim(sk, msg_en, msg_pl->sg.size + prot->overhead_size); |
d3b18ad3 JF |
746 | tls_ctx->pending_open_record_frags = true; |
747 | ctx->open_rec = tmp; | |
a42055e8 | 748 | } |
3c4d7559 | 749 | |
9932a29a | 750 | return tls_tx_records(sk, flags); |
3c4d7559 DW |
751 | } |
752 | ||
d3b18ad3 JF |
753 | static int bpf_exec_tx_verdict(struct sk_msg *msg, struct sock *sk, |
754 | bool full_record, u8 record_type, | |
755 | size_t *copied, int flags) | |
3c4d7559 DW |
756 | { |
757 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
f66de3ee | 758 | struct tls_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx); |
d3b18ad3 JF |
759 | struct sk_msg msg_redir = { }; |
760 | struct sk_psock *psock; | |
761 | struct sock *sk_redir; | |
a42055e8 | 762 | struct tls_rec *rec; |
0608c69c | 763 | bool enospc, policy; |
d3b18ad3 | 764 | int err = 0, send; |
7246d8ed | 765 | u32 delta = 0; |
d3b18ad3 | 766 | |
0608c69c | 767 | policy = !(flags & MSG_SENDPAGE_NOPOLICY); |
d3b18ad3 | 768 | psock = sk_psock_get(sk); |
0608c69c | 769 | if (!psock || !policy) |
d3b18ad3 JF |
770 | return tls_push_record(sk, flags, record_type); |
771 | more_data: | |
772 | enospc = sk_msg_full(msg); | |
7246d8ed JF |
773 | if (psock->eval == __SK_NONE) { |
774 | delta = msg->sg.size; | |
d3b18ad3 | 775 | psock->eval = sk_psock_msg_verdict(sk, psock, msg); |
7246d8ed JF |
776 | if (delta < msg->sg.size) |
777 | delta -= msg->sg.size; | |
778 | else | |
779 | delta = 0; | |
780 | } | |
d3b18ad3 JF |
781 | if (msg->cork_bytes && msg->cork_bytes > msg->sg.size && |
782 | !enospc && !full_record) { | |
783 | err = -ENOSPC; | |
784 | goto out_err; | |
785 | } | |
786 | msg->cork_bytes = 0; | |
787 | send = msg->sg.size; | |
788 | if (msg->apply_bytes && msg->apply_bytes < send) | |
789 | send = msg->apply_bytes; | |
790 | ||
791 | switch (psock->eval) { | |
792 | case __SK_PASS: | |
793 | err = tls_push_record(sk, flags, record_type); | |
794 | if (err < 0) { | |
795 | *copied -= sk_msg_free(sk, msg); | |
796 | tls_free_open_rec(sk); | |
797 | goto out_err; | |
798 | } | |
799 | break; | |
800 | case __SK_REDIRECT: | |
801 | sk_redir = psock->sk_redir; | |
802 | memcpy(&msg_redir, msg, sizeof(*msg)); | |
803 | if (msg->apply_bytes < send) | |
804 | msg->apply_bytes = 0; | |
805 | else | |
806 | msg->apply_bytes -= send; | |
807 | sk_msg_return_zero(sk, msg, send); | |
808 | msg->sg.size -= send; | |
809 | release_sock(sk); | |
810 | err = tcp_bpf_sendmsg_redir(sk_redir, &msg_redir, send, flags); | |
811 | lock_sock(sk); | |
812 | if (err < 0) { | |
813 | *copied -= sk_msg_free_nocharge(sk, &msg_redir); | |
814 | msg->sg.size = 0; | |
815 | } | |
816 | if (msg->sg.size == 0) | |
817 | tls_free_open_rec(sk); | |
818 | break; | |
819 | case __SK_DROP: | |
820 | default: | |
821 | sk_msg_free_partial(sk, msg, send); | |
822 | if (msg->apply_bytes < send) | |
823 | msg->apply_bytes = 0; | |
824 | else | |
825 | msg->apply_bytes -= send; | |
826 | if (msg->sg.size == 0) | |
827 | tls_free_open_rec(sk); | |
7246d8ed | 828 | *copied -= (send + delta); |
d3b18ad3 JF |
829 | err = -EACCES; |
830 | } | |
a42055e8 | 831 | |
d3b18ad3 JF |
832 | if (likely(!err)) { |
833 | bool reset_eval = !ctx->open_rec; | |
a42055e8 | 834 | |
d3b18ad3 JF |
835 | rec = ctx->open_rec; |
836 | if (rec) { | |
837 | msg = &rec->msg_plaintext; | |
838 | if (!msg->apply_bytes) | |
839 | reset_eval = true; | |
840 | } | |
841 | if (reset_eval) { | |
842 | psock->eval = __SK_NONE; | |
843 | if (psock->sk_redir) { | |
844 | sock_put(psock->sk_redir); | |
845 | psock->sk_redir = NULL; | |
846 | } | |
847 | } | |
848 | if (rec) | |
849 | goto more_data; | |
850 | } | |
851 | out_err: | |
852 | sk_psock_put(sk, psock); | |
853 | return err; | |
854 | } | |
855 | ||
856 | static int tls_sw_push_pending_record(struct sock *sk, int flags) | |
857 | { | |
858 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
859 | struct tls_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx); | |
860 | struct tls_rec *rec = ctx->open_rec; | |
861 | struct sk_msg *msg_pl; | |
862 | size_t copied; | |
a42055e8 | 863 | |
a42055e8 | 864 | if (!rec) |
d3b18ad3 | 865 | return 0; |
a42055e8 | 866 | |
d829e9c4 | 867 | msg_pl = &rec->msg_plaintext; |
d3b18ad3 JF |
868 | copied = msg_pl->sg.size; |
869 | if (!copied) | |
870 | return 0; | |
a42055e8 | 871 | |
d3b18ad3 JF |
872 | return bpf_exec_tx_verdict(msg_pl, sk, true, TLS_RECORD_TYPE_DATA, |
873 | &copied, flags); | |
a42055e8 VG |
874 | } |
875 | ||
876 | int tls_sw_sendmsg(struct sock *sk, struct msghdr *msg, size_t size) | |
877 | { | |
3c4d7559 | 878 | long timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT); |
a42055e8 | 879 | struct tls_context *tls_ctx = tls_get_ctx(sk); |
4509de14 | 880 | struct tls_prot_info *prot = &tls_ctx->prot_info; |
a42055e8 | 881 | struct tls_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx); |
5b053e12 | 882 | bool async_capable = ctx->async_capable; |
a42055e8 | 883 | unsigned char record_type = TLS_RECORD_TYPE_DATA; |
00e23707 | 884 | bool is_kvec = iov_iter_is_kvec(&msg->msg_iter); |
3c4d7559 DW |
885 | bool eor = !(msg->msg_flags & MSG_MORE); |
886 | size_t try_to_copy, copied = 0; | |
d829e9c4 | 887 | struct sk_msg *msg_pl, *msg_en; |
a42055e8 VG |
888 | struct tls_rec *rec; |
889 | int required_size; | |
890 | int num_async = 0; | |
3c4d7559 | 891 | bool full_record; |
a42055e8 VG |
892 | int record_room; |
893 | int num_zc = 0; | |
3c4d7559 | 894 | int orig_size; |
4128c0cf | 895 | int ret = 0; |
3c4d7559 DW |
896 | |
897 | if (msg->msg_flags & ~(MSG_MORE | MSG_DONTWAIT | MSG_NOSIGNAL)) | |
898 | return -ENOTSUPP; | |
899 | ||
900 | lock_sock(sk); | |
901 | ||
a42055e8 VG |
902 | /* Wait till there is any pending write on socket */ |
903 | if (unlikely(sk->sk_write_pending)) { | |
904 | ret = wait_on_pending_writer(sk, &timeo); | |
905 | if (unlikely(ret)) | |
906 | goto send_end; | |
907 | } | |
3c4d7559 DW |
908 | |
909 | if (unlikely(msg->msg_controllen)) { | |
910 | ret = tls_proccess_cmsg(sk, msg, &record_type); | |
a42055e8 VG |
911 | if (ret) { |
912 | if (ret == -EINPROGRESS) | |
913 | num_async++; | |
914 | else if (ret != -EAGAIN) | |
915 | goto send_end; | |
916 | } | |
3c4d7559 DW |
917 | } |
918 | ||
919 | while (msg_data_left(msg)) { | |
920 | if (sk->sk_err) { | |
30be8f8d | 921 | ret = -sk->sk_err; |
3c4d7559 DW |
922 | goto send_end; |
923 | } | |
924 | ||
d3b18ad3 JF |
925 | if (ctx->open_rec) |
926 | rec = ctx->open_rec; | |
927 | else | |
928 | rec = ctx->open_rec = tls_get_rec(sk); | |
a42055e8 VG |
929 | if (!rec) { |
930 | ret = -ENOMEM; | |
931 | goto send_end; | |
932 | } | |
933 | ||
d829e9c4 DB |
934 | msg_pl = &rec->msg_plaintext; |
935 | msg_en = &rec->msg_encrypted; | |
936 | ||
937 | orig_size = msg_pl->sg.size; | |
3c4d7559 DW |
938 | full_record = false; |
939 | try_to_copy = msg_data_left(msg); | |
d829e9c4 | 940 | record_room = TLS_MAX_PAYLOAD_SIZE - msg_pl->sg.size; |
3c4d7559 DW |
941 | if (try_to_copy >= record_room) { |
942 | try_to_copy = record_room; | |
943 | full_record = true; | |
944 | } | |
945 | ||
d829e9c4 | 946 | required_size = msg_pl->sg.size + try_to_copy + |
4509de14 | 947 | prot->overhead_size; |
3c4d7559 DW |
948 | |
949 | if (!sk_stream_memory_free(sk)) | |
950 | goto wait_for_sndbuf; | |
a42055e8 | 951 | |
3c4d7559 | 952 | alloc_encrypted: |
d829e9c4 | 953 | ret = tls_alloc_encrypted_msg(sk, required_size); |
3c4d7559 DW |
954 | if (ret) { |
955 | if (ret != -ENOSPC) | |
956 | goto wait_for_memory; | |
957 | ||
958 | /* Adjust try_to_copy according to the amount that was | |
959 | * actually allocated. The difference is due | |
960 | * to max sg elements limit | |
961 | */ | |
d829e9c4 | 962 | try_to_copy -= required_size - msg_en->sg.size; |
3c4d7559 DW |
963 | full_record = true; |
964 | } | |
a42055e8 VG |
965 | |
966 | if (!is_kvec && (full_record || eor) && !async_capable) { | |
d3b18ad3 JF |
967 | u32 first = msg_pl->sg.end; |
968 | ||
d829e9c4 DB |
969 | ret = sk_msg_zerocopy_from_iter(sk, &msg->msg_iter, |
970 | msg_pl, try_to_copy); | |
3c4d7559 DW |
971 | if (ret) |
972 | goto fallback_to_reg_send; | |
973 | ||
4e6d4720 VG |
974 | rec->inplace_crypto = 0; |
975 | ||
a42055e8 | 976 | num_zc++; |
3c4d7559 | 977 | copied += try_to_copy; |
d3b18ad3 JF |
978 | |
979 | sk_msg_sg_copy_set(msg_pl, first); | |
980 | ret = bpf_exec_tx_verdict(msg_pl, sk, full_record, | |
981 | record_type, &copied, | |
982 | msg->msg_flags); | |
a42055e8 VG |
983 | if (ret) { |
984 | if (ret == -EINPROGRESS) | |
985 | num_async++; | |
d3b18ad3 JF |
986 | else if (ret == -ENOMEM) |
987 | goto wait_for_memory; | |
988 | else if (ret == -ENOSPC) | |
989 | goto rollback_iter; | |
a42055e8 VG |
990 | else if (ret != -EAGAIN) |
991 | goto send_end; | |
992 | } | |
5a3611ef | 993 | continue; |
d3b18ad3 JF |
994 | rollback_iter: |
995 | copied -= try_to_copy; | |
996 | sk_msg_sg_copy_clear(msg_pl, first); | |
997 | iov_iter_revert(&msg->msg_iter, | |
998 | msg_pl->sg.size - orig_size); | |
3c4d7559 | 999 | fallback_to_reg_send: |
d829e9c4 | 1000 | sk_msg_trim(sk, msg_pl, orig_size); |
3c4d7559 DW |
1001 | } |
1002 | ||
d829e9c4 | 1003 | required_size = msg_pl->sg.size + try_to_copy; |
4e6d4720 | 1004 | |
d829e9c4 | 1005 | ret = tls_clone_plaintext_msg(sk, required_size); |
3c4d7559 DW |
1006 | if (ret) { |
1007 | if (ret != -ENOSPC) | |
4e6d4720 | 1008 | goto send_end; |
3c4d7559 DW |
1009 | |
1010 | /* Adjust try_to_copy according to the amount that was | |
1011 | * actually allocated. The difference is due | |
1012 | * to max sg elements limit | |
1013 | */ | |
d829e9c4 | 1014 | try_to_copy -= required_size - msg_pl->sg.size; |
3c4d7559 | 1015 | full_record = true; |
4509de14 VG |
1016 | sk_msg_trim(sk, msg_en, |
1017 | msg_pl->sg.size + prot->overhead_size); | |
3c4d7559 DW |
1018 | } |
1019 | ||
65a10e28 VG |
1020 | if (try_to_copy) { |
1021 | ret = sk_msg_memcopy_from_iter(sk, &msg->msg_iter, | |
1022 | msg_pl, try_to_copy); | |
1023 | if (ret < 0) | |
1024 | goto trim_sgl; | |
1025 | } | |
3c4d7559 | 1026 | |
d829e9c4 DB |
1027 | /* Open records defined only if successfully copied, otherwise |
1028 | * we would trim the sg but not reset the open record frags. | |
1029 | */ | |
1030 | tls_ctx->pending_open_record_frags = true; | |
3c4d7559 DW |
1031 | copied += try_to_copy; |
1032 | if (full_record || eor) { | |
d3b18ad3 JF |
1033 | ret = bpf_exec_tx_verdict(msg_pl, sk, full_record, |
1034 | record_type, &copied, | |
1035 | msg->msg_flags); | |
3c4d7559 | 1036 | if (ret) { |
a42055e8 VG |
1037 | if (ret == -EINPROGRESS) |
1038 | num_async++; | |
d3b18ad3 JF |
1039 | else if (ret == -ENOMEM) |
1040 | goto wait_for_memory; | |
1041 | else if (ret != -EAGAIN) { | |
1042 | if (ret == -ENOSPC) | |
1043 | ret = 0; | |
a42055e8 | 1044 | goto send_end; |
d3b18ad3 | 1045 | } |
3c4d7559 DW |
1046 | } |
1047 | } | |
1048 | ||
1049 | continue; | |
1050 | ||
1051 | wait_for_sndbuf: | |
1052 | set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); | |
1053 | wait_for_memory: | |
1054 | ret = sk_stream_wait_memory(sk, &timeo); | |
1055 | if (ret) { | |
1056 | trim_sgl: | |
d829e9c4 | 1057 | tls_trim_both_msgs(sk, orig_size); |
3c4d7559 DW |
1058 | goto send_end; |
1059 | } | |
1060 | ||
d829e9c4 | 1061 | if (msg_en->sg.size < required_size) |
3c4d7559 | 1062 | goto alloc_encrypted; |
3c4d7559 DW |
1063 | } |
1064 | ||
a42055e8 VG |
1065 | if (!num_async) { |
1066 | goto send_end; | |
1067 | } else if (num_zc) { | |
1068 | /* Wait for pending encryptions to get completed */ | |
1069 | smp_store_mb(ctx->async_notify, true); | |
1070 | ||
1071 | if (atomic_read(&ctx->encrypt_pending)) | |
1072 | crypto_wait_req(-EINPROGRESS, &ctx->async_wait); | |
1073 | else | |
1074 | reinit_completion(&ctx->async_wait.completion); | |
1075 | ||
1076 | WRITE_ONCE(ctx->async_notify, false); | |
1077 | ||
1078 | if (ctx->async_wait.err) { | |
1079 | ret = ctx->async_wait.err; | |
1080 | copied = 0; | |
1081 | } | |
1082 | } | |
1083 | ||
1084 | /* Transmit if any encryptions have completed */ | |
1085 | if (test_and_clear_bit(BIT_TX_SCHEDULED, &ctx->tx_bitmask)) { | |
1086 | cancel_delayed_work(&ctx->tx_work.work); | |
1087 | tls_tx_records(sk, msg->msg_flags); | |
1088 | } | |
1089 | ||
3c4d7559 DW |
1090 | send_end: |
1091 | ret = sk_stream_error(sk, msg->msg_flags, ret); | |
1092 | ||
1093 | release_sock(sk); | |
1094 | return copied ? copied : ret; | |
1095 | } | |
1096 | ||
01cb8a1a Y |
1097 | static int tls_sw_do_sendpage(struct sock *sk, struct page *page, |
1098 | int offset, size_t size, int flags) | |
3c4d7559 | 1099 | { |
a42055e8 | 1100 | long timeo = sock_sndtimeo(sk, flags & MSG_DONTWAIT); |
3c4d7559 | 1101 | struct tls_context *tls_ctx = tls_get_ctx(sk); |
f66de3ee | 1102 | struct tls_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx); |
4509de14 | 1103 | struct tls_prot_info *prot = &tls_ctx->prot_info; |
3c4d7559 | 1104 | unsigned char record_type = TLS_RECORD_TYPE_DATA; |
d829e9c4 | 1105 | struct sk_msg *msg_pl; |
a42055e8 VG |
1106 | struct tls_rec *rec; |
1107 | int num_async = 0; | |
d3b18ad3 | 1108 | size_t copied = 0; |
3c4d7559 DW |
1109 | bool full_record; |
1110 | int record_room; | |
4128c0cf | 1111 | int ret = 0; |
a42055e8 | 1112 | bool eor; |
3c4d7559 | 1113 | |
3c4d7559 | 1114 | eor = !(flags & (MSG_MORE | MSG_SENDPAGE_NOTLAST)); |
3c4d7559 DW |
1115 | sk_clear_bit(SOCKWQ_ASYNC_NOSPACE, sk); |
1116 | ||
a42055e8 VG |
1117 | /* Wait till there is any pending write on socket */ |
1118 | if (unlikely(sk->sk_write_pending)) { | |
1119 | ret = wait_on_pending_writer(sk, &timeo); | |
1120 | if (unlikely(ret)) | |
1121 | goto sendpage_end; | |
1122 | } | |
3c4d7559 DW |
1123 | |
1124 | /* Call the sk_stream functions to manage the sndbuf mem. */ | |
1125 | while (size > 0) { | |
1126 | size_t copy, required_size; | |
1127 | ||
1128 | if (sk->sk_err) { | |
30be8f8d | 1129 | ret = -sk->sk_err; |
3c4d7559 DW |
1130 | goto sendpage_end; |
1131 | } | |
1132 | ||
d3b18ad3 JF |
1133 | if (ctx->open_rec) |
1134 | rec = ctx->open_rec; | |
1135 | else | |
1136 | rec = ctx->open_rec = tls_get_rec(sk); | |
a42055e8 VG |
1137 | if (!rec) { |
1138 | ret = -ENOMEM; | |
1139 | goto sendpage_end; | |
1140 | } | |
1141 | ||
d829e9c4 DB |
1142 | msg_pl = &rec->msg_plaintext; |
1143 | ||
3c4d7559 | 1144 | full_record = false; |
d829e9c4 | 1145 | record_room = TLS_MAX_PAYLOAD_SIZE - msg_pl->sg.size; |
3c4d7559 DW |
1146 | copy = size; |
1147 | if (copy >= record_room) { | |
1148 | copy = record_room; | |
1149 | full_record = true; | |
1150 | } | |
d829e9c4 | 1151 | |
4509de14 | 1152 | required_size = msg_pl->sg.size + copy + prot->overhead_size; |
3c4d7559 DW |
1153 | |
1154 | if (!sk_stream_memory_free(sk)) | |
1155 | goto wait_for_sndbuf; | |
1156 | alloc_payload: | |
d829e9c4 | 1157 | ret = tls_alloc_encrypted_msg(sk, required_size); |
3c4d7559 DW |
1158 | if (ret) { |
1159 | if (ret != -ENOSPC) | |
1160 | goto wait_for_memory; | |
1161 | ||
1162 | /* Adjust copy according to the amount that was | |
1163 | * actually allocated. The difference is due | |
1164 | * to max sg elements limit | |
1165 | */ | |
d829e9c4 | 1166 | copy -= required_size - msg_pl->sg.size; |
3c4d7559 DW |
1167 | full_record = true; |
1168 | } | |
1169 | ||
d829e9c4 | 1170 | sk_msg_page_add(msg_pl, page, copy, offset); |
3c4d7559 | 1171 | sk_mem_charge(sk, copy); |
d829e9c4 | 1172 | |
3c4d7559 DW |
1173 | offset += copy; |
1174 | size -= copy; | |
d3b18ad3 | 1175 | copied += copy; |
3c4d7559 | 1176 | |
d829e9c4 DB |
1177 | tls_ctx->pending_open_record_frags = true; |
1178 | if (full_record || eor || sk_msg_full(msg_pl)) { | |
4e6d4720 | 1179 | rec->inplace_crypto = 0; |
d3b18ad3 JF |
1180 | ret = bpf_exec_tx_verdict(msg_pl, sk, full_record, |
1181 | record_type, &copied, flags); | |
3c4d7559 | 1182 | if (ret) { |
a42055e8 VG |
1183 | if (ret == -EINPROGRESS) |
1184 | num_async++; | |
d3b18ad3 JF |
1185 | else if (ret == -ENOMEM) |
1186 | goto wait_for_memory; | |
1187 | else if (ret != -EAGAIN) { | |
1188 | if (ret == -ENOSPC) | |
1189 | ret = 0; | |
a42055e8 | 1190 | goto sendpage_end; |
d3b18ad3 | 1191 | } |
3c4d7559 DW |
1192 | } |
1193 | } | |
1194 | continue; | |
1195 | wait_for_sndbuf: | |
1196 | set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); | |
1197 | wait_for_memory: | |
1198 | ret = sk_stream_wait_memory(sk, &timeo); | |
1199 | if (ret) { | |
d829e9c4 | 1200 | tls_trim_both_msgs(sk, msg_pl->sg.size); |
3c4d7559 DW |
1201 | goto sendpage_end; |
1202 | } | |
1203 | ||
3c4d7559 DW |
1204 | goto alloc_payload; |
1205 | } | |
1206 | ||
a42055e8 VG |
1207 | if (num_async) { |
1208 | /* Transmit if any encryptions have completed */ | |
1209 | if (test_and_clear_bit(BIT_TX_SCHEDULED, &ctx->tx_bitmask)) { | |
1210 | cancel_delayed_work(&ctx->tx_work.work); | |
1211 | tls_tx_records(sk, flags); | |
1212 | } | |
1213 | } | |
3c4d7559 | 1214 | sendpage_end: |
d3b18ad3 | 1215 | ret = sk_stream_error(sk, flags, ret); |
d3b18ad3 | 1216 | return copied ? copied : ret; |
3c4d7559 DW |
1217 | } |
1218 | ||
0608c69c JF |
1219 | int tls_sw_sendpage(struct sock *sk, struct page *page, |
1220 | int offset, size_t size, int flags) | |
1221 | { | |
1222 | int ret; | |
1223 | ||
1224 | if (flags & ~(MSG_MORE | MSG_DONTWAIT | MSG_NOSIGNAL | | |
1225 | MSG_SENDPAGE_NOTLAST | MSG_SENDPAGE_NOPOLICY)) | |
1226 | return -ENOTSUPP; | |
1227 | ||
1228 | lock_sock(sk); | |
1229 | ret = tls_sw_do_sendpage(sk, page, offset, size, flags); | |
1230 | release_sock(sk); | |
1231 | return ret; | |
1232 | } | |
1233 | ||
d3b18ad3 JF |
1234 | static struct sk_buff *tls_wait_data(struct sock *sk, struct sk_psock *psock, |
1235 | int flags, long timeo, int *err) | |
c46234eb DW |
1236 | { |
1237 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
f66de3ee | 1238 | struct tls_sw_context_rx *ctx = tls_sw_ctx_rx(tls_ctx); |
c46234eb DW |
1239 | struct sk_buff *skb; |
1240 | DEFINE_WAIT_FUNC(wait, woken_wake_function); | |
1241 | ||
d3b18ad3 | 1242 | while (!(skb = ctx->recv_pkt) && sk_psock_queue_empty(psock)) { |
c46234eb DW |
1243 | if (sk->sk_err) { |
1244 | *err = sock_error(sk); | |
1245 | return NULL; | |
1246 | } | |
1247 | ||
fcf4793e DRK |
1248 | if (sk->sk_shutdown & RCV_SHUTDOWN) |
1249 | return NULL; | |
1250 | ||
c46234eb DW |
1251 | if (sock_flag(sk, SOCK_DONE)) |
1252 | return NULL; | |
1253 | ||
1254 | if ((flags & MSG_DONTWAIT) || !timeo) { | |
1255 | *err = -EAGAIN; | |
1256 | return NULL; | |
1257 | } | |
1258 | ||
1259 | add_wait_queue(sk_sleep(sk), &wait); | |
1260 | sk_set_bit(SOCKWQ_ASYNC_WAITDATA, sk); | |
d3b18ad3 JF |
1261 | sk_wait_event(sk, &timeo, |
1262 | ctx->recv_pkt != skb || | |
1263 | !sk_psock_queue_empty(psock), | |
1264 | &wait); | |
c46234eb DW |
1265 | sk_clear_bit(SOCKWQ_ASYNC_WAITDATA, sk); |
1266 | remove_wait_queue(sk_sleep(sk), &wait); | |
1267 | ||
1268 | /* Handle signals */ | |
1269 | if (signal_pending(current)) { | |
1270 | *err = sock_intr_errno(timeo); | |
1271 | return NULL; | |
1272 | } | |
1273 | } | |
1274 | ||
1275 | return skb; | |
1276 | } | |
1277 | ||
d829e9c4 DB |
1278 | static int tls_setup_from_iter(struct sock *sk, struct iov_iter *from, |
1279 | int length, int *pages_used, | |
1280 | unsigned int *size_used, | |
1281 | struct scatterlist *to, | |
1282 | int to_max_pages) | |
1283 | { | |
1284 | int rc = 0, i = 0, num_elem = *pages_used, maxpages; | |
1285 | struct page *pages[MAX_SKB_FRAGS]; | |
1286 | unsigned int size = *size_used; | |
1287 | ssize_t copied, use; | |
1288 | size_t offset; | |
1289 | ||
1290 | while (length > 0) { | |
1291 | i = 0; | |
1292 | maxpages = to_max_pages - num_elem; | |
1293 | if (maxpages == 0) { | |
1294 | rc = -EFAULT; | |
1295 | goto out; | |
1296 | } | |
1297 | copied = iov_iter_get_pages(from, pages, | |
1298 | length, | |
1299 | maxpages, &offset); | |
1300 | if (copied <= 0) { | |
1301 | rc = -EFAULT; | |
1302 | goto out; | |
1303 | } | |
1304 | ||
1305 | iov_iter_advance(from, copied); | |
1306 | ||
1307 | length -= copied; | |
1308 | size += copied; | |
1309 | while (copied) { | |
1310 | use = min_t(int, copied, PAGE_SIZE - offset); | |
1311 | ||
1312 | sg_set_page(&to[num_elem], | |
1313 | pages[i], use, offset); | |
1314 | sg_unmark_end(&to[num_elem]); | |
1315 | /* We do not uncharge memory from this API */ | |
1316 | ||
1317 | offset = 0; | |
1318 | copied -= use; | |
1319 | ||
1320 | i++; | |
1321 | num_elem++; | |
1322 | } | |
1323 | } | |
1324 | /* Mark the end in the last sg entry if newly added */ | |
1325 | if (num_elem > *pages_used) | |
1326 | sg_mark_end(&to[num_elem - 1]); | |
1327 | out: | |
1328 | if (rc) | |
1329 | iov_iter_revert(from, size - *size_used); | |
1330 | *size_used = size; | |
1331 | *pages_used = num_elem; | |
1332 | ||
1333 | return rc; | |
1334 | } | |
1335 | ||
0b243d00 VG |
1336 | /* This function decrypts the input skb into either out_iov or in out_sg |
1337 | * or in skb buffers itself. The input parameter 'zc' indicates if | |
1338 | * zero-copy mode needs to be tried or not. With zero-copy mode, either | |
1339 | * out_iov or out_sg must be non-NULL. In case both out_iov and out_sg are | |
1340 | * NULL, then the decryption happens inside skb buffers itself, i.e. | |
1341 | * zero-copy gets disabled and 'zc' is updated. | |
1342 | */ | |
1343 | ||
1344 | static int decrypt_internal(struct sock *sk, struct sk_buff *skb, | |
1345 | struct iov_iter *out_iov, | |
1346 | struct scatterlist *out_sg, | |
692d7b5d | 1347 | int *chunk, bool *zc, bool async) |
0b243d00 VG |
1348 | { |
1349 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
1350 | struct tls_sw_context_rx *ctx = tls_sw_ctx_rx(tls_ctx); | |
4509de14 | 1351 | struct tls_prot_info *prot = &tls_ctx->prot_info; |
0b243d00 VG |
1352 | struct strp_msg *rxm = strp_msg(skb); |
1353 | int n_sgin, n_sgout, nsg, mem_size, aead_size, err, pages = 0; | |
1354 | struct aead_request *aead_req; | |
1355 | struct sk_buff *unused; | |
1356 | u8 *aad, *iv, *mem = NULL; | |
1357 | struct scatterlist *sgin = NULL; | |
1358 | struct scatterlist *sgout = NULL; | |
4509de14 VG |
1359 | const int data_len = rxm->full_len - prot->overhead_size + |
1360 | prot->tail_size; | |
f295b3ae | 1361 | int iv_offset = 0; |
0b243d00 VG |
1362 | |
1363 | if (*zc && (out_iov || out_sg)) { | |
1364 | if (out_iov) | |
1365 | n_sgout = iov_iter_npages(out_iov, INT_MAX) + 1; | |
1366 | else | |
1367 | n_sgout = sg_nents(out_sg); | |
4509de14 VG |
1368 | n_sgin = skb_nsg(skb, rxm->offset + prot->prepend_size, |
1369 | rxm->full_len - prot->prepend_size); | |
0b243d00 VG |
1370 | } else { |
1371 | n_sgout = 0; | |
1372 | *zc = false; | |
0927f71d | 1373 | n_sgin = skb_cow_data(skb, 0, &unused); |
0b243d00 VG |
1374 | } |
1375 | ||
0b243d00 VG |
1376 | if (n_sgin < 1) |
1377 | return -EBADMSG; | |
1378 | ||
1379 | /* Increment to accommodate AAD */ | |
1380 | n_sgin = n_sgin + 1; | |
1381 | ||
1382 | nsg = n_sgin + n_sgout; | |
1383 | ||
1384 | aead_size = sizeof(*aead_req) + crypto_aead_reqsize(ctx->aead_recv); | |
1385 | mem_size = aead_size + (nsg * sizeof(struct scatterlist)); | |
4509de14 | 1386 | mem_size = mem_size + prot->aad_size; |
0b243d00 VG |
1387 | mem_size = mem_size + crypto_aead_ivsize(ctx->aead_recv); |
1388 | ||
1389 | /* Allocate a single block of memory which contains | |
1390 | * aead_req || sgin[] || sgout[] || aad || iv. | |
1391 | * This order achieves correct alignment for aead_req, sgin, sgout. | |
1392 | */ | |
1393 | mem = kmalloc(mem_size, sk->sk_allocation); | |
1394 | if (!mem) | |
1395 | return -ENOMEM; | |
1396 | ||
1397 | /* Segment the allocated memory */ | |
1398 | aead_req = (struct aead_request *)mem; | |
1399 | sgin = (struct scatterlist *)(mem + aead_size); | |
1400 | sgout = sgin + n_sgin; | |
1401 | aad = (u8 *)(sgout + n_sgout); | |
4509de14 | 1402 | iv = aad + prot->aad_size; |
0b243d00 | 1403 | |
f295b3ae VG |
1404 | /* For CCM based ciphers, first byte of nonce+iv is always '2' */ |
1405 | if (prot->cipher_type == TLS_CIPHER_AES_CCM_128) { | |
1406 | iv[0] = 2; | |
1407 | iv_offset = 1; | |
1408 | } | |
1409 | ||
0b243d00 VG |
1410 | /* Prepare IV */ |
1411 | err = skb_copy_bits(skb, rxm->offset + TLS_HEADER_SIZE, | |
f295b3ae | 1412 | iv + iv_offset + prot->salt_size, |
4509de14 | 1413 | prot->iv_size); |
0b243d00 VG |
1414 | if (err < 0) { |
1415 | kfree(mem); | |
1416 | return err; | |
1417 | } | |
4509de14 | 1418 | if (prot->version == TLS_1_3_VERSION) |
f295b3ae VG |
1419 | memcpy(iv + iv_offset, tls_ctx->rx.iv, |
1420 | crypto_aead_ivsize(ctx->aead_recv)); | |
130b392c | 1421 | else |
f295b3ae | 1422 | memcpy(iv + iv_offset, tls_ctx->rx.iv, prot->salt_size); |
130b392c | 1423 | |
4509de14 | 1424 | xor_iv_with_seq(prot->version, iv, tls_ctx->rx.rec_seq); |
0b243d00 VG |
1425 | |
1426 | /* Prepare AAD */ | |
4509de14 VG |
1427 | tls_make_aad(aad, rxm->full_len - prot->overhead_size + |
1428 | prot->tail_size, | |
1429 | tls_ctx->rx.rec_seq, prot->rec_seq_size, | |
1430 | ctx->control, prot->version); | |
0b243d00 VG |
1431 | |
1432 | /* Prepare sgin */ | |
1433 | sg_init_table(sgin, n_sgin); | |
4509de14 | 1434 | sg_set_buf(&sgin[0], aad, prot->aad_size); |
0b243d00 | 1435 | err = skb_to_sgvec(skb, &sgin[1], |
4509de14 VG |
1436 | rxm->offset + prot->prepend_size, |
1437 | rxm->full_len - prot->prepend_size); | |
0b243d00 VG |
1438 | if (err < 0) { |
1439 | kfree(mem); | |
1440 | return err; | |
1441 | } | |
1442 | ||
1443 | if (n_sgout) { | |
1444 | if (out_iov) { | |
1445 | sg_init_table(sgout, n_sgout); | |
4509de14 | 1446 | sg_set_buf(&sgout[0], aad, prot->aad_size); |
0b243d00 VG |
1447 | |
1448 | *chunk = 0; | |
d829e9c4 DB |
1449 | err = tls_setup_from_iter(sk, out_iov, data_len, |
1450 | &pages, chunk, &sgout[1], | |
1451 | (n_sgout - 1)); | |
0b243d00 VG |
1452 | if (err < 0) |
1453 | goto fallback_to_reg_recv; | |
1454 | } else if (out_sg) { | |
1455 | memcpy(sgout, out_sg, n_sgout * sizeof(*sgout)); | |
1456 | } else { | |
1457 | goto fallback_to_reg_recv; | |
1458 | } | |
1459 | } else { | |
1460 | fallback_to_reg_recv: | |
1461 | sgout = sgin; | |
1462 | pages = 0; | |
692d7b5d | 1463 | *chunk = data_len; |
0b243d00 VG |
1464 | *zc = false; |
1465 | } | |
1466 | ||
1467 | /* Prepare and submit AEAD request */ | |
94524d8f | 1468 | err = tls_do_decryption(sk, skb, sgin, sgout, iv, |
692d7b5d | 1469 | data_len, aead_req, async); |
94524d8f VG |
1470 | if (err == -EINPROGRESS) |
1471 | return err; | |
0b243d00 VG |
1472 | |
1473 | /* Release the pages in case iov was mapped to pages */ | |
1474 | for (; pages > 0; pages--) | |
1475 | put_page(sg_page(&sgout[pages])); | |
1476 | ||
1477 | kfree(mem); | |
1478 | return err; | |
1479 | } | |
1480 | ||
dafb67f3 | 1481 | static int decrypt_skb_update(struct sock *sk, struct sk_buff *skb, |
692d7b5d VG |
1482 | struct iov_iter *dest, int *chunk, bool *zc, |
1483 | bool async) | |
dafb67f3 BP |
1484 | { |
1485 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
1486 | struct tls_sw_context_rx *ctx = tls_sw_ctx_rx(tls_ctx); | |
4509de14 | 1487 | struct tls_prot_info *prot = &tls_ctx->prot_info; |
dafb67f3 | 1488 | struct strp_msg *rxm = strp_msg(skb); |
b53f4976 | 1489 | int pad, err = 0; |
dafb67f3 | 1490 | |
4799ac81 | 1491 | if (!ctx->decrypted) { |
d069b780 | 1492 | #ifdef CONFIG_TLS_DEVICE |
b9d8fec9 JK |
1493 | if (tls_ctx->rx_conf == TLS_HW) { |
1494 | err = tls_device_decrypted(sk, skb); | |
1495 | if (err < 0) | |
1496 | return err; | |
1497 | } | |
d069b780 BP |
1498 | #endif |
1499 | /* Still not decrypted after tls_device */ | |
1500 | if (!ctx->decrypted) { | |
1501 | err = decrypt_internal(sk, skb, dest, NULL, chunk, zc, | |
1502 | async); | |
1503 | if (err < 0) { | |
1504 | if (err == -EINPROGRESS) | |
fb0f886f JK |
1505 | tls_advance_record_sn(sk, prot, |
1506 | &tls_ctx->rx); | |
d069b780 BP |
1507 | |
1508 | return err; | |
1509 | } | |
c43ac97b JK |
1510 | } else { |
1511 | *zc = false; | |
94524d8f | 1512 | } |
130b392c | 1513 | |
b53f4976 JK |
1514 | pad = padding_length(ctx, prot, skb); |
1515 | if (pad < 0) | |
1516 | return pad; | |
1517 | ||
1518 | rxm->full_len -= pad; | |
4509de14 VG |
1519 | rxm->offset += prot->prepend_size; |
1520 | rxm->full_len -= prot->overhead_size; | |
fb0f886f | 1521 | tls_advance_record_sn(sk, prot, &tls_ctx->rx); |
fedf201e DW |
1522 | ctx->decrypted = true; |
1523 | ctx->saved_data_ready(sk); | |
4799ac81 BP |
1524 | } else { |
1525 | *zc = false; | |
1526 | } | |
dafb67f3 | 1527 | |
dafb67f3 BP |
1528 | return err; |
1529 | } | |
1530 | ||
1531 | int decrypt_skb(struct sock *sk, struct sk_buff *skb, | |
1532 | struct scatterlist *sgout) | |
c46234eb | 1533 | { |
0b243d00 VG |
1534 | bool zc = true; |
1535 | int chunk; | |
c46234eb | 1536 | |
692d7b5d | 1537 | return decrypt_internal(sk, skb, NULL, sgout, &chunk, &zc, false); |
c46234eb DW |
1538 | } |
1539 | ||
1540 | static bool tls_sw_advance_skb(struct sock *sk, struct sk_buff *skb, | |
1541 | unsigned int len) | |
1542 | { | |
1543 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
f66de3ee | 1544 | struct tls_sw_context_rx *ctx = tls_sw_ctx_rx(tls_ctx); |
c46234eb | 1545 | |
94524d8f VG |
1546 | if (skb) { |
1547 | struct strp_msg *rxm = strp_msg(skb); | |
c46234eb | 1548 | |
94524d8f VG |
1549 | if (len < rxm->full_len) { |
1550 | rxm->offset += len; | |
1551 | rxm->full_len -= len; | |
1552 | return false; | |
1553 | } | |
a88c26f6 | 1554 | consume_skb(skb); |
c46234eb DW |
1555 | } |
1556 | ||
1557 | /* Finished with message */ | |
1558 | ctx->recv_pkt = NULL; | |
7170e604 | 1559 | __strp_unpause(&ctx->strp); |
c46234eb DW |
1560 | |
1561 | return true; | |
1562 | } | |
1563 | ||
692d7b5d | 1564 | /* This function traverses the rx_list in tls receive context to copies the |
2b794c40 | 1565 | * decrypted records into the buffer provided by caller zero copy is not |
692d7b5d VG |
1566 | * true. Further, the records are removed from the rx_list if it is not a peek |
1567 | * case and the record has been consumed completely. | |
1568 | */ | |
1569 | static int process_rx_list(struct tls_sw_context_rx *ctx, | |
1570 | struct msghdr *msg, | |
2b794c40 VG |
1571 | u8 *control, |
1572 | bool *cmsg, | |
692d7b5d VG |
1573 | size_t skip, |
1574 | size_t len, | |
1575 | bool zc, | |
1576 | bool is_peek) | |
1577 | { | |
1578 | struct sk_buff *skb = skb_peek(&ctx->rx_list); | |
2b794c40 VG |
1579 | u8 ctrl = *control; |
1580 | u8 msgc = *cmsg; | |
1581 | struct tls_msg *tlm; | |
692d7b5d VG |
1582 | ssize_t copied = 0; |
1583 | ||
2b794c40 VG |
1584 | /* Set the record type in 'control' if caller didn't pass it */ |
1585 | if (!ctrl && skb) { | |
1586 | tlm = tls_msg(skb); | |
1587 | ctrl = tlm->control; | |
1588 | } | |
1589 | ||
692d7b5d VG |
1590 | while (skip && skb) { |
1591 | struct strp_msg *rxm = strp_msg(skb); | |
2b794c40 VG |
1592 | tlm = tls_msg(skb); |
1593 | ||
1594 | /* Cannot process a record of different type */ | |
1595 | if (ctrl != tlm->control) | |
1596 | return 0; | |
692d7b5d VG |
1597 | |
1598 | if (skip < rxm->full_len) | |
1599 | break; | |
1600 | ||
1601 | skip = skip - rxm->full_len; | |
1602 | skb = skb_peek_next(skb, &ctx->rx_list); | |
1603 | } | |
1604 | ||
1605 | while (len && skb) { | |
1606 | struct sk_buff *next_skb; | |
1607 | struct strp_msg *rxm = strp_msg(skb); | |
1608 | int chunk = min_t(unsigned int, rxm->full_len - skip, len); | |
1609 | ||
2b794c40 VG |
1610 | tlm = tls_msg(skb); |
1611 | ||
1612 | /* Cannot process a record of different type */ | |
1613 | if (ctrl != tlm->control) | |
1614 | return 0; | |
1615 | ||
1616 | /* Set record type if not already done. For a non-data record, | |
1617 | * do not proceed if record type could not be copied. | |
1618 | */ | |
1619 | if (!msgc) { | |
1620 | int cerr = put_cmsg(msg, SOL_TLS, TLS_GET_RECORD_TYPE, | |
1621 | sizeof(ctrl), &ctrl); | |
1622 | msgc = true; | |
1623 | if (ctrl != TLS_RECORD_TYPE_DATA) { | |
1624 | if (cerr || msg->msg_flags & MSG_CTRUNC) | |
1625 | return -EIO; | |
1626 | ||
1627 | *cmsg = msgc; | |
1628 | } | |
1629 | } | |
1630 | ||
692d7b5d VG |
1631 | if (!zc || (rxm->full_len - skip) > len) { |
1632 | int err = skb_copy_datagram_msg(skb, rxm->offset + skip, | |
1633 | msg, chunk); | |
1634 | if (err < 0) | |
1635 | return err; | |
1636 | } | |
1637 | ||
1638 | len = len - chunk; | |
1639 | copied = copied + chunk; | |
1640 | ||
1641 | /* Consume the data from record if it is non-peek case*/ | |
1642 | if (!is_peek) { | |
1643 | rxm->offset = rxm->offset + chunk; | |
1644 | rxm->full_len = rxm->full_len - chunk; | |
1645 | ||
1646 | /* Return if there is unconsumed data in the record */ | |
1647 | if (rxm->full_len - skip) | |
1648 | break; | |
1649 | } | |
1650 | ||
1651 | /* The remaining skip-bytes must lie in 1st record in rx_list. | |
1652 | * So from the 2nd record, 'skip' should be 0. | |
1653 | */ | |
1654 | skip = 0; | |
1655 | ||
1656 | if (msg) | |
1657 | msg->msg_flags |= MSG_EOR; | |
1658 | ||
1659 | next_skb = skb_peek_next(skb, &ctx->rx_list); | |
1660 | ||
1661 | if (!is_peek) { | |
1662 | skb_unlink(skb, &ctx->rx_list); | |
a88c26f6 | 1663 | consume_skb(skb); |
692d7b5d VG |
1664 | } |
1665 | ||
1666 | skb = next_skb; | |
1667 | } | |
1668 | ||
2b794c40 | 1669 | *control = ctrl; |
692d7b5d VG |
1670 | return copied; |
1671 | } | |
1672 | ||
c46234eb DW |
1673 | int tls_sw_recvmsg(struct sock *sk, |
1674 | struct msghdr *msg, | |
1675 | size_t len, | |
1676 | int nonblock, | |
1677 | int flags, | |
1678 | int *addr_len) | |
1679 | { | |
1680 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
f66de3ee | 1681 | struct tls_sw_context_rx *ctx = tls_sw_ctx_rx(tls_ctx); |
4509de14 | 1682 | struct tls_prot_info *prot = &tls_ctx->prot_info; |
d3b18ad3 | 1683 | struct sk_psock *psock; |
692d7b5d VG |
1684 | unsigned char control = 0; |
1685 | ssize_t decrypted = 0; | |
c46234eb | 1686 | struct strp_msg *rxm; |
2b794c40 | 1687 | struct tls_msg *tlm; |
c46234eb DW |
1688 | struct sk_buff *skb; |
1689 | ssize_t copied = 0; | |
1690 | bool cmsg = false; | |
06030dba | 1691 | int target, err = 0; |
c46234eb | 1692 | long timeo; |
00e23707 | 1693 | bool is_kvec = iov_iter_is_kvec(&msg->msg_iter); |
692d7b5d | 1694 | bool is_peek = flags & MSG_PEEK; |
94524d8f | 1695 | int num_async = 0; |
c46234eb DW |
1696 | |
1697 | flags |= nonblock; | |
1698 | ||
1699 | if (unlikely(flags & MSG_ERRQUEUE)) | |
1700 | return sock_recv_errqueue(sk, msg, len, SOL_IP, IP_RECVERR); | |
1701 | ||
d3b18ad3 | 1702 | psock = sk_psock_get(sk); |
c46234eb DW |
1703 | lock_sock(sk); |
1704 | ||
692d7b5d | 1705 | /* Process pending decrypted records. It must be non-zero-copy */ |
2b794c40 VG |
1706 | err = process_rx_list(ctx, msg, &control, &cmsg, 0, len, false, |
1707 | is_peek); | |
692d7b5d VG |
1708 | if (err < 0) { |
1709 | tls_err_abort(sk, err); | |
1710 | goto end; | |
1711 | } else { | |
1712 | copied = err; | |
1713 | } | |
1714 | ||
46a16959 | 1715 | if (len <= copied) |
692d7b5d | 1716 | goto recv_end; |
46a16959 JK |
1717 | |
1718 | target = sock_rcvlowat(sk, flags & MSG_WAITALL, len); | |
1719 | len = len - copied; | |
1720 | timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT); | |
692d7b5d | 1721 | |
04b25a54 | 1722 | while (len && (decrypted + copied < target || ctx->recv_pkt)) { |
692d7b5d | 1723 | bool retain_skb = false; |
692d7b5d VG |
1724 | bool zc = false; |
1725 | int to_decrypt; | |
c46234eb | 1726 | int chunk = 0; |
7754bd63 EBE |
1727 | bool async_capable; |
1728 | bool async = false; | |
c46234eb | 1729 | |
d3b18ad3 JF |
1730 | skb = tls_wait_data(sk, psock, flags, timeo, &err); |
1731 | if (!skb) { | |
1732 | if (psock) { | |
02c558b2 JF |
1733 | int ret = __tcp_bpf_recvmsg(sk, psock, |
1734 | msg, len, flags); | |
d3b18ad3 JF |
1735 | |
1736 | if (ret > 0) { | |
692d7b5d | 1737 | decrypted += ret; |
d3b18ad3 JF |
1738 | len -= ret; |
1739 | continue; | |
1740 | } | |
1741 | } | |
c46234eb | 1742 | goto recv_end; |
2b794c40 VG |
1743 | } else { |
1744 | tlm = tls_msg(skb); | |
1745 | if (prot->version == TLS_1_3_VERSION) | |
1746 | tlm->control = 0; | |
1747 | else | |
1748 | tlm->control = ctx->control; | |
d3b18ad3 | 1749 | } |
c46234eb DW |
1750 | |
1751 | rxm = strp_msg(skb); | |
94524d8f | 1752 | |
4509de14 | 1753 | to_decrypt = rxm->full_len - prot->overhead_size; |
fedf201e DW |
1754 | |
1755 | if (to_decrypt <= len && !is_kvec && !is_peek && | |
130b392c | 1756 | ctx->control == TLS_RECORD_TYPE_DATA && |
4509de14 | 1757 | prot->version != TLS_1_3_VERSION) |
fedf201e DW |
1758 | zc = true; |
1759 | ||
c0ab4732 VG |
1760 | /* Do not use async mode if record is non-data */ |
1761 | if (ctx->control == TLS_RECORD_TYPE_DATA) | |
7754bd63 | 1762 | async_capable = ctx->async_capable; |
c0ab4732 | 1763 | else |
7754bd63 | 1764 | async_capable = false; |
c0ab4732 | 1765 | |
fedf201e | 1766 | err = decrypt_skb_update(sk, skb, &msg->msg_iter, |
7754bd63 | 1767 | &chunk, &zc, async_capable); |
fedf201e DW |
1768 | if (err < 0 && err != -EINPROGRESS) { |
1769 | tls_err_abort(sk, EBADMSG); | |
1770 | goto recv_end; | |
1771 | } | |
1772 | ||
7754bd63 EBE |
1773 | if (err == -EINPROGRESS) { |
1774 | async = true; | |
fedf201e | 1775 | num_async++; |
7754bd63 | 1776 | } else if (prot->version == TLS_1_3_VERSION) { |
2b794c40 | 1777 | tlm->control = ctx->control; |
7754bd63 | 1778 | } |
2b794c40 VG |
1779 | |
1780 | /* If the type of records being processed is not known yet, | |
1781 | * set it to record type just dequeued. If it is already known, | |
1782 | * but does not match the record type just dequeued, go to end. | |
1783 | * We always get record type here since for tls1.2, record type | |
1784 | * is known just after record is dequeued from stream parser. | |
1785 | * For tls1.3, we disable async. | |
1786 | */ | |
1787 | ||
1788 | if (!control) | |
1789 | control = tlm->control; | |
1790 | else if (control != tlm->control) | |
1791 | goto recv_end; | |
fedf201e | 1792 | |
c46234eb DW |
1793 | if (!cmsg) { |
1794 | int cerr; | |
1795 | ||
1796 | cerr = put_cmsg(msg, SOL_TLS, TLS_GET_RECORD_TYPE, | |
2b794c40 | 1797 | sizeof(control), &control); |
c46234eb | 1798 | cmsg = true; |
2b794c40 | 1799 | if (control != TLS_RECORD_TYPE_DATA) { |
c46234eb DW |
1800 | if (cerr || msg->msg_flags & MSG_CTRUNC) { |
1801 | err = -EIO; | |
1802 | goto recv_end; | |
1803 | } | |
1804 | } | |
c46234eb DW |
1805 | } |
1806 | ||
c0ab4732 VG |
1807 | if (async) |
1808 | goto pick_next_record; | |
1809 | ||
fedf201e DW |
1810 | if (!zc) { |
1811 | if (rxm->full_len > len) { | |
1812 | retain_skb = true; | |
1813 | chunk = len; | |
1814 | } else { | |
1815 | chunk = rxm->full_len; | |
1816 | } | |
692d7b5d | 1817 | |
fedf201e DW |
1818 | err = skb_copy_datagram_msg(skb, rxm->offset, |
1819 | msg, chunk); | |
1820 | if (err < 0) | |
1821 | goto recv_end; | |
94524d8f | 1822 | |
fedf201e DW |
1823 | if (!is_peek) { |
1824 | rxm->offset = rxm->offset + chunk; | |
1825 | rxm->full_len = rxm->full_len - chunk; | |
692d7b5d | 1826 | } |
c46234eb DW |
1827 | } |
1828 | ||
94524d8f | 1829 | pick_next_record: |
692d7b5d VG |
1830 | if (chunk > len) |
1831 | chunk = len; | |
1832 | ||
1833 | decrypted += chunk; | |
c46234eb | 1834 | len -= chunk; |
692d7b5d VG |
1835 | |
1836 | /* For async or peek case, queue the current skb */ | |
1837 | if (async || is_peek || retain_skb) { | |
1838 | skb_queue_tail(&ctx->rx_list, skb); | |
1839 | skb = NULL; | |
1840 | } | |
1841 | ||
1842 | if (tls_sw_advance_skb(sk, skb, chunk)) { | |
1843 | /* Return full control message to | |
1844 | * userspace before trying to parse | |
1845 | * another message type | |
50c6b58a | 1846 | */ |
692d7b5d VG |
1847 | msg->msg_flags |= MSG_EOR; |
1848 | if (ctx->control != TLS_RECORD_TYPE_DATA) | |
1849 | goto recv_end; | |
1850 | } else { | |
50c6b58a | 1851 | break; |
c46234eb | 1852 | } |
04b25a54 | 1853 | } |
c46234eb DW |
1854 | |
1855 | recv_end: | |
94524d8f VG |
1856 | if (num_async) { |
1857 | /* Wait for all previously submitted records to be decrypted */ | |
1858 | smp_store_mb(ctx->async_notify, true); | |
1859 | if (atomic_read(&ctx->decrypt_pending)) { | |
1860 | err = crypto_wait_req(-EINPROGRESS, &ctx->async_wait); | |
1861 | if (err) { | |
1862 | /* one of async decrypt failed */ | |
1863 | tls_err_abort(sk, err); | |
1864 | copied = 0; | |
692d7b5d VG |
1865 | decrypted = 0; |
1866 | goto end; | |
94524d8f VG |
1867 | } |
1868 | } else { | |
1869 | reinit_completion(&ctx->async_wait.completion); | |
1870 | } | |
1871 | WRITE_ONCE(ctx->async_notify, false); | |
692d7b5d VG |
1872 | |
1873 | /* Drain records from the rx_list & copy if required */ | |
1874 | if (is_peek || is_kvec) | |
2b794c40 | 1875 | err = process_rx_list(ctx, msg, &control, &cmsg, copied, |
692d7b5d VG |
1876 | decrypted, false, is_peek); |
1877 | else | |
2b794c40 | 1878 | err = process_rx_list(ctx, msg, &control, &cmsg, 0, |
692d7b5d VG |
1879 | decrypted, true, is_peek); |
1880 | if (err < 0) { | |
1881 | tls_err_abort(sk, err); | |
1882 | copied = 0; | |
1883 | goto end; | |
1884 | } | |
94524d8f VG |
1885 | } |
1886 | ||
692d7b5d VG |
1887 | copied += decrypted; |
1888 | ||
1889 | end: | |
c46234eb | 1890 | release_sock(sk); |
d3b18ad3 JF |
1891 | if (psock) |
1892 | sk_psock_put(sk, psock); | |
c46234eb DW |
1893 | return copied ? : err; |
1894 | } | |
1895 | ||
1896 | ssize_t tls_sw_splice_read(struct socket *sock, loff_t *ppos, | |
1897 | struct pipe_inode_info *pipe, | |
1898 | size_t len, unsigned int flags) | |
1899 | { | |
1900 | struct tls_context *tls_ctx = tls_get_ctx(sock->sk); | |
f66de3ee | 1901 | struct tls_sw_context_rx *ctx = tls_sw_ctx_rx(tls_ctx); |
c46234eb DW |
1902 | struct strp_msg *rxm = NULL; |
1903 | struct sock *sk = sock->sk; | |
1904 | struct sk_buff *skb; | |
1905 | ssize_t copied = 0; | |
1906 | int err = 0; | |
1907 | long timeo; | |
1908 | int chunk; | |
0b243d00 | 1909 | bool zc = false; |
c46234eb DW |
1910 | |
1911 | lock_sock(sk); | |
1912 | ||
1913 | timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT); | |
1914 | ||
d3b18ad3 | 1915 | skb = tls_wait_data(sk, NULL, flags, timeo, &err); |
c46234eb DW |
1916 | if (!skb) |
1917 | goto splice_read_end; | |
1918 | ||
c46234eb | 1919 | if (!ctx->decrypted) { |
692d7b5d | 1920 | err = decrypt_skb_update(sk, skb, NULL, &chunk, &zc, false); |
c46234eb | 1921 | |
fedf201e DW |
1922 | /* splice does not support reading control messages */ |
1923 | if (ctx->control != TLS_RECORD_TYPE_DATA) { | |
1924 | err = -ENOTSUPP; | |
1925 | goto splice_read_end; | |
1926 | } | |
1927 | ||
c46234eb DW |
1928 | if (err < 0) { |
1929 | tls_err_abort(sk, EBADMSG); | |
1930 | goto splice_read_end; | |
1931 | } | |
1932 | ctx->decrypted = true; | |
1933 | } | |
1934 | rxm = strp_msg(skb); | |
1935 | ||
1936 | chunk = min_t(unsigned int, rxm->full_len, len); | |
1937 | copied = skb_splice_bits(skb, sk, rxm->offset, pipe, chunk, flags); | |
1938 | if (copied < 0) | |
1939 | goto splice_read_end; | |
1940 | ||
1941 | if (likely(!(flags & MSG_PEEK))) | |
1942 | tls_sw_advance_skb(sk, skb, copied); | |
1943 | ||
1944 | splice_read_end: | |
1945 | release_sock(sk); | |
1946 | return copied ? : err; | |
1947 | } | |
1948 | ||
924ad65e | 1949 | bool tls_sw_stream_read(const struct sock *sk) |
c46234eb | 1950 | { |
c46234eb | 1951 | struct tls_context *tls_ctx = tls_get_ctx(sk); |
f66de3ee | 1952 | struct tls_sw_context_rx *ctx = tls_sw_ctx_rx(tls_ctx); |
d3b18ad3 JF |
1953 | bool ingress_empty = true; |
1954 | struct sk_psock *psock; | |
c46234eb | 1955 | |
d3b18ad3 JF |
1956 | rcu_read_lock(); |
1957 | psock = sk_psock(sk); | |
1958 | if (psock) | |
1959 | ingress_empty = list_empty(&psock->ingress_msg); | |
1960 | rcu_read_unlock(); | |
c46234eb | 1961 | |
13aecb17 JK |
1962 | return !ingress_empty || ctx->recv_pkt || |
1963 | !skb_queue_empty(&ctx->rx_list); | |
c46234eb DW |
1964 | } |
1965 | ||
1966 | static int tls_read_size(struct strparser *strp, struct sk_buff *skb) | |
1967 | { | |
1968 | struct tls_context *tls_ctx = tls_get_ctx(strp->sk); | |
f66de3ee | 1969 | struct tls_sw_context_rx *ctx = tls_sw_ctx_rx(tls_ctx); |
4509de14 | 1970 | struct tls_prot_info *prot = &tls_ctx->prot_info; |
3463e51d | 1971 | char header[TLS_HEADER_SIZE + MAX_IV_SIZE]; |
c46234eb DW |
1972 | struct strp_msg *rxm = strp_msg(skb); |
1973 | size_t cipher_overhead; | |
1974 | size_t data_len = 0; | |
1975 | int ret; | |
1976 | ||
1977 | /* Verify that we have a full TLS header, or wait for more data */ | |
4509de14 | 1978 | if (rxm->offset + prot->prepend_size > skb->len) |
c46234eb DW |
1979 | return 0; |
1980 | ||
3463e51d | 1981 | /* Sanity-check size of on-stack buffer. */ |
4509de14 | 1982 | if (WARN_ON(prot->prepend_size > sizeof(header))) { |
3463e51d KC |
1983 | ret = -EINVAL; |
1984 | goto read_failure; | |
1985 | } | |
1986 | ||
c46234eb | 1987 | /* Linearize header to local buffer */ |
4509de14 | 1988 | ret = skb_copy_bits(skb, rxm->offset, header, prot->prepend_size); |
c46234eb DW |
1989 | |
1990 | if (ret < 0) | |
1991 | goto read_failure; | |
1992 | ||
1993 | ctx->control = header[0]; | |
1994 | ||
1995 | data_len = ((header[4] & 0xFF) | (header[3] << 8)); | |
1996 | ||
4509de14 VG |
1997 | cipher_overhead = prot->tag_size; |
1998 | if (prot->version != TLS_1_3_VERSION) | |
1999 | cipher_overhead += prot->iv_size; | |
c46234eb | 2000 | |
130b392c | 2001 | if (data_len > TLS_MAX_PAYLOAD_SIZE + cipher_overhead + |
4509de14 | 2002 | prot->tail_size) { |
c46234eb DW |
2003 | ret = -EMSGSIZE; |
2004 | goto read_failure; | |
2005 | } | |
2006 | if (data_len < cipher_overhead) { | |
2007 | ret = -EBADMSG; | |
2008 | goto read_failure; | |
2009 | } | |
2010 | ||
130b392c DW |
2011 | /* Note that both TLS1.3 and TLS1.2 use TLS_1_2 version here */ |
2012 | if (header[1] != TLS_1_2_VERSION_MINOR || | |
2013 | header[2] != TLS_1_2_VERSION_MAJOR) { | |
c46234eb DW |
2014 | ret = -EINVAL; |
2015 | goto read_failure; | |
2016 | } | |
4799ac81 | 2017 | #ifdef CONFIG_TLS_DEVICE |
f953d33b | 2018 | tls_device_rx_resync_new_rec(strp->sk, data_len + TLS_HEADER_SIZE, |
fe58a5a0 | 2019 | TCP_SKB_CB(skb)->seq + rxm->offset); |
4799ac81 | 2020 | #endif |
c46234eb DW |
2021 | return data_len + TLS_HEADER_SIZE; |
2022 | ||
2023 | read_failure: | |
2024 | tls_err_abort(strp->sk, ret); | |
2025 | ||
2026 | return ret; | |
2027 | } | |
2028 | ||
2029 | static void tls_queue(struct strparser *strp, struct sk_buff *skb) | |
2030 | { | |
2031 | struct tls_context *tls_ctx = tls_get_ctx(strp->sk); | |
f66de3ee | 2032 | struct tls_sw_context_rx *ctx = tls_sw_ctx_rx(tls_ctx); |
c46234eb DW |
2033 | |
2034 | ctx->decrypted = false; | |
2035 | ||
2036 | ctx->recv_pkt = skb; | |
2037 | strp_pause(strp); | |
2038 | ||
ad13acce | 2039 | ctx->saved_data_ready(strp->sk); |
c46234eb DW |
2040 | } |
2041 | ||
2042 | static void tls_data_ready(struct sock *sk) | |
2043 | { | |
2044 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
f66de3ee | 2045 | struct tls_sw_context_rx *ctx = tls_sw_ctx_rx(tls_ctx); |
d3b18ad3 | 2046 | struct sk_psock *psock; |
c46234eb DW |
2047 | |
2048 | strp_data_ready(&ctx->strp); | |
d3b18ad3 JF |
2049 | |
2050 | psock = sk_psock_get(sk); | |
2051 | if (psock && !list_empty(&psock->ingress_msg)) { | |
2052 | ctx->saved_data_ready(sk); | |
2053 | sk_psock_put(sk, psock); | |
2054 | } | |
c46234eb DW |
2055 | } |
2056 | ||
f66de3ee | 2057 | void tls_sw_free_resources_tx(struct sock *sk) |
3c4d7559 DW |
2058 | { |
2059 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
f66de3ee | 2060 | struct tls_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx); |
a42055e8 VG |
2061 | struct tls_rec *rec, *tmp; |
2062 | ||
2063 | /* Wait for any pending async encryptions to complete */ | |
2064 | smp_store_mb(ctx->async_notify, true); | |
2065 | if (atomic_read(&ctx->encrypt_pending)) | |
2066 | crypto_wait_req(-EINPROGRESS, &ctx->async_wait); | |
2067 | ||
10231213 | 2068 | release_sock(sk); |
a42055e8 | 2069 | cancel_delayed_work_sync(&ctx->tx_work.work); |
10231213 | 2070 | lock_sock(sk); |
a42055e8 VG |
2071 | |
2072 | /* Tx whatever records we can transmit and abandon the rest */ | |
2073 | tls_tx_records(sk, -1); | |
2074 | ||
9932a29a | 2075 | /* Free up un-sent records in tx_list. First, free |
a42055e8 VG |
2076 | * the partially sent record if any at head of tx_list. |
2077 | */ | |
35b71a34 | 2078 | if (tls_free_partial_record(sk, tls_ctx)) { |
9932a29a | 2079 | rec = list_first_entry(&ctx->tx_list, |
a42055e8 VG |
2080 | struct tls_rec, list); |
2081 | list_del(&rec->list); | |
d829e9c4 | 2082 | sk_msg_free(sk, &rec->msg_plaintext); |
a42055e8 VG |
2083 | kfree(rec); |
2084 | } | |
2085 | ||
9932a29a | 2086 | list_for_each_entry_safe(rec, tmp, &ctx->tx_list, list) { |
a42055e8 | 2087 | list_del(&rec->list); |
d829e9c4 DB |
2088 | sk_msg_free(sk, &rec->msg_encrypted); |
2089 | sk_msg_free(sk, &rec->msg_plaintext); | |
a42055e8 VG |
2090 | kfree(rec); |
2091 | } | |
3c4d7559 | 2092 | |
201876b3 | 2093 | crypto_free_aead(ctx->aead_send); |
c774973e | 2094 | tls_free_open_rec(sk); |
f66de3ee BP |
2095 | |
2096 | kfree(ctx); | |
2097 | } | |
2098 | ||
39f56e1a | 2099 | void tls_sw_release_resources_rx(struct sock *sk) |
f66de3ee BP |
2100 | { |
2101 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
2102 | struct tls_sw_context_rx *ctx = tls_sw_ctx_rx(tls_ctx); | |
2103 | ||
12c76861 JK |
2104 | kfree(tls_ctx->rx.rec_seq); |
2105 | kfree(tls_ctx->rx.iv); | |
2106 | ||
c46234eb | 2107 | if (ctx->aead_recv) { |
201876b3 VG |
2108 | kfree_skb(ctx->recv_pkt); |
2109 | ctx->recv_pkt = NULL; | |
692d7b5d | 2110 | skb_queue_purge(&ctx->rx_list); |
c46234eb DW |
2111 | crypto_free_aead(ctx->aead_recv); |
2112 | strp_stop(&ctx->strp); | |
2113 | write_lock_bh(&sk->sk_callback_lock); | |
2114 | sk->sk_data_ready = ctx->saved_data_ready; | |
2115 | write_unlock_bh(&sk->sk_callback_lock); | |
2116 | release_sock(sk); | |
2117 | strp_done(&ctx->strp); | |
2118 | lock_sock(sk); | |
2119 | } | |
39f56e1a BP |
2120 | } |
2121 | ||
2122 | void tls_sw_free_resources_rx(struct sock *sk) | |
2123 | { | |
2124 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
2125 | struct tls_sw_context_rx *ctx = tls_sw_ctx_rx(tls_ctx); | |
2126 | ||
2127 | tls_sw_release_resources_rx(sk); | |
3c4d7559 | 2128 | |
3c4d7559 DW |
2129 | kfree(ctx); |
2130 | } | |
2131 | ||
9932a29a | 2132 | /* The work handler to transmitt the encrypted records in tx_list */ |
a42055e8 VG |
2133 | static void tx_work_handler(struct work_struct *work) |
2134 | { | |
2135 | struct delayed_work *delayed_work = to_delayed_work(work); | |
2136 | struct tx_work *tx_work = container_of(delayed_work, | |
2137 | struct tx_work, work); | |
2138 | struct sock *sk = tx_work->sk; | |
2139 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
2140 | struct tls_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx); | |
2141 | ||
2142 | if (!test_and_clear_bit(BIT_TX_SCHEDULED, &ctx->tx_bitmask)) | |
2143 | return; | |
2144 | ||
2145 | lock_sock(sk); | |
2146 | tls_tx_records(sk, -1); | |
2147 | release_sock(sk); | |
2148 | } | |
2149 | ||
7463d3a2 BP |
2150 | void tls_sw_write_space(struct sock *sk, struct tls_context *ctx) |
2151 | { | |
2152 | struct tls_sw_context_tx *tx_ctx = tls_sw_ctx_tx(ctx); | |
2153 | ||
2154 | /* Schedule the transmission if tx list is ready */ | |
2155 | if (is_tx_ready(tx_ctx) && !sk->sk_write_pending) { | |
2156 | /* Schedule the transmission */ | |
2157 | if (!test_and_set_bit(BIT_TX_SCHEDULED, | |
2158 | &tx_ctx->tx_bitmask)) | |
2159 | schedule_delayed_work(&tx_ctx->tx_work.work, 0); | |
2160 | } | |
2161 | } | |
2162 | ||
c46234eb | 2163 | int tls_set_sw_offload(struct sock *sk, struct tls_context *ctx, int tx) |
3c4d7559 | 2164 | { |
4509de14 VG |
2165 | struct tls_context *tls_ctx = tls_get_ctx(sk); |
2166 | struct tls_prot_info *prot = &tls_ctx->prot_info; | |
3c4d7559 DW |
2167 | struct tls_crypto_info *crypto_info; |
2168 | struct tls12_crypto_info_aes_gcm_128 *gcm_128_info; | |
fb99bce7 | 2169 | struct tls12_crypto_info_aes_gcm_256 *gcm_256_info; |
f295b3ae | 2170 | struct tls12_crypto_info_aes_ccm_128 *ccm_128_info; |
f66de3ee BP |
2171 | struct tls_sw_context_tx *sw_ctx_tx = NULL; |
2172 | struct tls_sw_context_rx *sw_ctx_rx = NULL; | |
c46234eb DW |
2173 | struct cipher_context *cctx; |
2174 | struct crypto_aead **aead; | |
2175 | struct strp_callbacks cb; | |
f295b3ae | 2176 | u16 nonce_size, tag_size, iv_size, rec_seq_size, salt_size; |
692d7b5d | 2177 | struct crypto_tfm *tfm; |
f295b3ae | 2178 | char *iv, *rec_seq, *key, *salt, *cipher_name; |
fb99bce7 | 2179 | size_t keysize; |
3c4d7559 DW |
2180 | int rc = 0; |
2181 | ||
2182 | if (!ctx) { | |
2183 | rc = -EINVAL; | |
2184 | goto out; | |
2185 | } | |
2186 | ||
f66de3ee | 2187 | if (tx) { |
b190a587 BP |
2188 | if (!ctx->priv_ctx_tx) { |
2189 | sw_ctx_tx = kzalloc(sizeof(*sw_ctx_tx), GFP_KERNEL); | |
2190 | if (!sw_ctx_tx) { | |
2191 | rc = -ENOMEM; | |
2192 | goto out; | |
2193 | } | |
2194 | ctx->priv_ctx_tx = sw_ctx_tx; | |
2195 | } else { | |
2196 | sw_ctx_tx = | |
2197 | (struct tls_sw_context_tx *)ctx->priv_ctx_tx; | |
c46234eb | 2198 | } |
c46234eb | 2199 | } else { |
b190a587 BP |
2200 | if (!ctx->priv_ctx_rx) { |
2201 | sw_ctx_rx = kzalloc(sizeof(*sw_ctx_rx), GFP_KERNEL); | |
2202 | if (!sw_ctx_rx) { | |
2203 | rc = -ENOMEM; | |
2204 | goto out; | |
2205 | } | |
2206 | ctx->priv_ctx_rx = sw_ctx_rx; | |
2207 | } else { | |
2208 | sw_ctx_rx = | |
2209 | (struct tls_sw_context_rx *)ctx->priv_ctx_rx; | |
f66de3ee | 2210 | } |
3c4d7559 DW |
2211 | } |
2212 | ||
c46234eb | 2213 | if (tx) { |
b190a587 | 2214 | crypto_init_wait(&sw_ctx_tx->async_wait); |
86029d10 | 2215 | crypto_info = &ctx->crypto_send.info; |
c46234eb | 2216 | cctx = &ctx->tx; |
f66de3ee | 2217 | aead = &sw_ctx_tx->aead_send; |
9932a29a | 2218 | INIT_LIST_HEAD(&sw_ctx_tx->tx_list); |
a42055e8 VG |
2219 | INIT_DELAYED_WORK(&sw_ctx_tx->tx_work.work, tx_work_handler); |
2220 | sw_ctx_tx->tx_work.sk = sk; | |
c46234eb | 2221 | } else { |
b190a587 | 2222 | crypto_init_wait(&sw_ctx_rx->async_wait); |
86029d10 | 2223 | crypto_info = &ctx->crypto_recv.info; |
c46234eb | 2224 | cctx = &ctx->rx; |
692d7b5d | 2225 | skb_queue_head_init(&sw_ctx_rx->rx_list); |
f66de3ee | 2226 | aead = &sw_ctx_rx->aead_recv; |
c46234eb DW |
2227 | } |
2228 | ||
3c4d7559 DW |
2229 | switch (crypto_info->cipher_type) { |
2230 | case TLS_CIPHER_AES_GCM_128: { | |
2231 | nonce_size = TLS_CIPHER_AES_GCM_128_IV_SIZE; | |
2232 | tag_size = TLS_CIPHER_AES_GCM_128_TAG_SIZE; | |
2233 | iv_size = TLS_CIPHER_AES_GCM_128_IV_SIZE; | |
2234 | iv = ((struct tls12_crypto_info_aes_gcm_128 *)crypto_info)->iv; | |
2235 | rec_seq_size = TLS_CIPHER_AES_GCM_128_REC_SEQ_SIZE; | |
2236 | rec_seq = | |
2237 | ((struct tls12_crypto_info_aes_gcm_128 *)crypto_info)->rec_seq; | |
2238 | gcm_128_info = | |
2239 | (struct tls12_crypto_info_aes_gcm_128 *)crypto_info; | |
fb99bce7 DW |
2240 | keysize = TLS_CIPHER_AES_GCM_128_KEY_SIZE; |
2241 | key = gcm_128_info->key; | |
2242 | salt = gcm_128_info->salt; | |
f295b3ae VG |
2243 | salt_size = TLS_CIPHER_AES_GCM_128_SALT_SIZE; |
2244 | cipher_name = "gcm(aes)"; | |
fb99bce7 DW |
2245 | break; |
2246 | } | |
2247 | case TLS_CIPHER_AES_GCM_256: { | |
2248 | nonce_size = TLS_CIPHER_AES_GCM_256_IV_SIZE; | |
2249 | tag_size = TLS_CIPHER_AES_GCM_256_TAG_SIZE; | |
2250 | iv_size = TLS_CIPHER_AES_GCM_256_IV_SIZE; | |
2251 | iv = ((struct tls12_crypto_info_aes_gcm_256 *)crypto_info)->iv; | |
2252 | rec_seq_size = TLS_CIPHER_AES_GCM_256_REC_SEQ_SIZE; | |
2253 | rec_seq = | |
2254 | ((struct tls12_crypto_info_aes_gcm_256 *)crypto_info)->rec_seq; | |
2255 | gcm_256_info = | |
2256 | (struct tls12_crypto_info_aes_gcm_256 *)crypto_info; | |
2257 | keysize = TLS_CIPHER_AES_GCM_256_KEY_SIZE; | |
2258 | key = gcm_256_info->key; | |
2259 | salt = gcm_256_info->salt; | |
f295b3ae VG |
2260 | salt_size = TLS_CIPHER_AES_GCM_256_SALT_SIZE; |
2261 | cipher_name = "gcm(aes)"; | |
2262 | break; | |
2263 | } | |
2264 | case TLS_CIPHER_AES_CCM_128: { | |
2265 | nonce_size = TLS_CIPHER_AES_CCM_128_IV_SIZE; | |
2266 | tag_size = TLS_CIPHER_AES_CCM_128_TAG_SIZE; | |
2267 | iv_size = TLS_CIPHER_AES_CCM_128_IV_SIZE; | |
2268 | iv = ((struct tls12_crypto_info_aes_ccm_128 *)crypto_info)->iv; | |
2269 | rec_seq_size = TLS_CIPHER_AES_CCM_128_REC_SEQ_SIZE; | |
2270 | rec_seq = | |
2271 | ((struct tls12_crypto_info_aes_ccm_128 *)crypto_info)->rec_seq; | |
2272 | ccm_128_info = | |
2273 | (struct tls12_crypto_info_aes_ccm_128 *)crypto_info; | |
2274 | keysize = TLS_CIPHER_AES_CCM_128_KEY_SIZE; | |
2275 | key = ccm_128_info->key; | |
2276 | salt = ccm_128_info->salt; | |
2277 | salt_size = TLS_CIPHER_AES_CCM_128_SALT_SIZE; | |
2278 | cipher_name = "ccm(aes)"; | |
3c4d7559 DW |
2279 | break; |
2280 | } | |
2281 | default: | |
2282 | rc = -EINVAL; | |
cf6d43ef | 2283 | goto free_priv; |
3c4d7559 DW |
2284 | } |
2285 | ||
89fec474 JK |
2286 | /* Sanity-check the sizes for stack allocations. */ |
2287 | if (iv_size > MAX_IV_SIZE || nonce_size > MAX_IV_SIZE || | |
2288 | rec_seq_size > TLS_MAX_REC_SEQ_SIZE) { | |
b16520f7 KC |
2289 | rc = -EINVAL; |
2290 | goto free_priv; | |
2291 | } | |
2292 | ||
130b392c DW |
2293 | if (crypto_info->version == TLS_1_3_VERSION) { |
2294 | nonce_size = 0; | |
4509de14 VG |
2295 | prot->aad_size = TLS_HEADER_SIZE; |
2296 | prot->tail_size = 1; | |
130b392c | 2297 | } else { |
4509de14 VG |
2298 | prot->aad_size = TLS_AAD_SPACE_SIZE; |
2299 | prot->tail_size = 0; | |
130b392c DW |
2300 | } |
2301 | ||
4509de14 VG |
2302 | prot->version = crypto_info->version; |
2303 | prot->cipher_type = crypto_info->cipher_type; | |
2304 | prot->prepend_size = TLS_HEADER_SIZE + nonce_size; | |
2305 | prot->tag_size = tag_size; | |
2306 | prot->overhead_size = prot->prepend_size + | |
2307 | prot->tag_size + prot->tail_size; | |
2308 | prot->iv_size = iv_size; | |
f295b3ae VG |
2309 | prot->salt_size = salt_size; |
2310 | cctx->iv = kmalloc(iv_size + salt_size, GFP_KERNEL); | |
c46234eb | 2311 | if (!cctx->iv) { |
3c4d7559 | 2312 | rc = -ENOMEM; |
cf6d43ef | 2313 | goto free_priv; |
3c4d7559 | 2314 | } |
fb99bce7 | 2315 | /* Note: 128 & 256 bit salt are the same size */ |
4509de14 | 2316 | prot->rec_seq_size = rec_seq_size; |
f295b3ae VG |
2317 | memcpy(cctx->iv, salt, salt_size); |
2318 | memcpy(cctx->iv + salt_size, iv, iv_size); | |
969d5090 | 2319 | cctx->rec_seq = kmemdup(rec_seq, rec_seq_size, GFP_KERNEL); |
c46234eb | 2320 | if (!cctx->rec_seq) { |
3c4d7559 DW |
2321 | rc = -ENOMEM; |
2322 | goto free_iv; | |
2323 | } | |
c46234eb | 2324 | |
c46234eb | 2325 | if (!*aead) { |
f295b3ae | 2326 | *aead = crypto_alloc_aead(cipher_name, 0, 0); |
c46234eb DW |
2327 | if (IS_ERR(*aead)) { |
2328 | rc = PTR_ERR(*aead); | |
2329 | *aead = NULL; | |
3c4d7559 DW |
2330 | goto free_rec_seq; |
2331 | } | |
2332 | } | |
2333 | ||
2334 | ctx->push_pending_record = tls_sw_push_pending_record; | |
2335 | ||
fb99bce7 DW |
2336 | rc = crypto_aead_setkey(*aead, key, keysize); |
2337 | ||
3c4d7559 DW |
2338 | if (rc) |
2339 | goto free_aead; | |
2340 | ||
4509de14 | 2341 | rc = crypto_aead_setauthsize(*aead, prot->tag_size); |
c46234eb DW |
2342 | if (rc) |
2343 | goto free_aead; | |
2344 | ||
f66de3ee | 2345 | if (sw_ctx_rx) { |
692d7b5d | 2346 | tfm = crypto_aead_tfm(sw_ctx_rx->aead_recv); |
8497ded2 VG |
2347 | |
2348 | if (crypto_info->version == TLS_1_3_VERSION) | |
2349 | sw_ctx_rx->async_capable = false; | |
2350 | else | |
2351 | sw_ctx_rx->async_capable = | |
2352 | tfm->__crt_alg->cra_flags & CRYPTO_ALG_ASYNC; | |
692d7b5d | 2353 | |
c46234eb DW |
2354 | /* Set up strparser */ |
2355 | memset(&cb, 0, sizeof(cb)); | |
2356 | cb.rcv_msg = tls_queue; | |
2357 | cb.parse_msg = tls_read_size; | |
2358 | ||
f66de3ee | 2359 | strp_init(&sw_ctx_rx->strp, sk, &cb); |
c46234eb DW |
2360 | |
2361 | write_lock_bh(&sk->sk_callback_lock); | |
f66de3ee | 2362 | sw_ctx_rx->saved_data_ready = sk->sk_data_ready; |
c46234eb DW |
2363 | sk->sk_data_ready = tls_data_ready; |
2364 | write_unlock_bh(&sk->sk_callback_lock); | |
2365 | ||
f66de3ee | 2366 | strp_check_rcv(&sw_ctx_rx->strp); |
c46234eb DW |
2367 | } |
2368 | ||
2369 | goto out; | |
3c4d7559 DW |
2370 | |
2371 | free_aead: | |
c46234eb DW |
2372 | crypto_free_aead(*aead); |
2373 | *aead = NULL; | |
3c4d7559 | 2374 | free_rec_seq: |
c46234eb DW |
2375 | kfree(cctx->rec_seq); |
2376 | cctx->rec_seq = NULL; | |
3c4d7559 | 2377 | free_iv: |
f66de3ee BP |
2378 | kfree(cctx->iv); |
2379 | cctx->iv = NULL; | |
cf6d43ef | 2380 | free_priv: |
f66de3ee BP |
2381 | if (tx) { |
2382 | kfree(ctx->priv_ctx_tx); | |
2383 | ctx->priv_ctx_tx = NULL; | |
2384 | } else { | |
2385 | kfree(ctx->priv_ctx_rx); | |
2386 | ctx->priv_ctx_rx = NULL; | |
2387 | } | |
3c4d7559 DW |
2388 | out: |
2389 | return rc; | |
2390 | } |