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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) { | |
5c5ec668 JK |
171 | if (err == -EBADMSG) |
172 | TLS_INC_STATS(sock_net(skb->sk), | |
173 | LINUX_MIB_TLSDECRYPTERROR); | |
94524d8f | 174 | ctx->async_wait.err = err; |
7a3dd8c8 | 175 | tls_err_abort(skb->sk, err); |
692d7b5d VG |
176 | } else { |
177 | struct strp_msg *rxm = strp_msg(skb); | |
b53f4976 JK |
178 | int pad; |
179 | ||
180 | pad = padding_length(ctx, prot, skb); | |
181 | if (pad < 0) { | |
182 | ctx->async_wait.err = pad; | |
183 | tls_err_abort(skb->sk, pad); | |
184 | } else { | |
185 | rxm->full_len -= pad; | |
186 | rxm->offset += prot->prepend_size; | |
187 | rxm->full_len -= prot->overhead_size; | |
188 | } | |
94524d8f VG |
189 | } |
190 | ||
7a3dd8c8 JF |
191 | /* After using skb->sk to propagate sk through crypto async callback |
192 | * we need to NULL it again. | |
193 | */ | |
194 | skb->sk = NULL; | |
195 | ||
94524d8f | 196 | |
692d7b5d VG |
197 | /* Free the destination pages if skb was not decrypted inplace */ |
198 | if (sgout != sgin) { | |
199 | /* Skip the first S/G entry as it points to AAD */ | |
200 | for_each_sg(sg_next(sgout), sg, UINT_MAX, pages) { | |
201 | if (!sg) | |
202 | break; | |
203 | put_page(sg_page(sg)); | |
204 | } | |
94524d8f VG |
205 | } |
206 | ||
207 | kfree(aead_req); | |
208 | ||
0cada332 | 209 | spin_lock_bh(&ctx->decrypt_compl_lock); |
692d7b5d VG |
210 | pending = atomic_dec_return(&ctx->decrypt_pending); |
211 | ||
0cada332 | 212 | if (!pending && ctx->async_notify) |
94524d8f | 213 | complete(&ctx->async_wait.completion); |
0cada332 | 214 | spin_unlock_bh(&ctx->decrypt_compl_lock); |
94524d8f VG |
215 | } |
216 | ||
c46234eb | 217 | static int tls_do_decryption(struct sock *sk, |
94524d8f | 218 | struct sk_buff *skb, |
c46234eb DW |
219 | struct scatterlist *sgin, |
220 | struct scatterlist *sgout, | |
221 | char *iv_recv, | |
222 | size_t data_len, | |
94524d8f VG |
223 | struct aead_request *aead_req, |
224 | bool async) | |
c46234eb DW |
225 | { |
226 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
4509de14 | 227 | struct tls_prot_info *prot = &tls_ctx->prot_info; |
f66de3ee | 228 | struct tls_sw_context_rx *ctx = tls_sw_ctx_rx(tls_ctx); |
c46234eb | 229 | int ret; |
c46234eb | 230 | |
0b243d00 | 231 | aead_request_set_tfm(aead_req, ctx->aead_recv); |
4509de14 | 232 | aead_request_set_ad(aead_req, prot->aad_size); |
c46234eb | 233 | aead_request_set_crypt(aead_req, sgin, sgout, |
4509de14 | 234 | data_len + prot->tag_size, |
c46234eb | 235 | (u8 *)iv_recv); |
c46234eb | 236 | |
94524d8f | 237 | if (async) { |
7a3dd8c8 JF |
238 | /* Using skb->sk to push sk through to crypto async callback |
239 | * handler. This allows propagating errors up to the socket | |
240 | * if needed. It _must_ be cleared in the async handler | |
a88c26f6 | 241 | * before consume_skb is called. We _know_ skb->sk is NULL |
7a3dd8c8 JF |
242 | * because it is a clone from strparser. |
243 | */ | |
244 | skb->sk = sk; | |
94524d8f VG |
245 | aead_request_set_callback(aead_req, |
246 | CRYPTO_TFM_REQ_MAY_BACKLOG, | |
247 | tls_decrypt_done, skb); | |
248 | atomic_inc(&ctx->decrypt_pending); | |
249 | } else { | |
250 | aead_request_set_callback(aead_req, | |
251 | CRYPTO_TFM_REQ_MAY_BACKLOG, | |
252 | crypto_req_done, &ctx->async_wait); | |
253 | } | |
254 | ||
255 | ret = crypto_aead_decrypt(aead_req); | |
256 | if (ret == -EINPROGRESS) { | |
257 | if (async) | |
258 | return ret; | |
259 | ||
260 | ret = crypto_wait_req(ret, &ctx->async_wait); | |
261 | } | |
262 | ||
263 | if (async) | |
264 | atomic_dec(&ctx->decrypt_pending); | |
265 | ||
c46234eb DW |
266 | return ret; |
267 | } | |
268 | ||
d829e9c4 | 269 | static void tls_trim_both_msgs(struct sock *sk, int target_size) |
3c4d7559 DW |
270 | { |
271 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
4509de14 | 272 | struct tls_prot_info *prot = &tls_ctx->prot_info; |
f66de3ee | 273 | struct tls_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx); |
a42055e8 | 274 | struct tls_rec *rec = ctx->open_rec; |
3c4d7559 | 275 | |
d829e9c4 | 276 | sk_msg_trim(sk, &rec->msg_plaintext, target_size); |
3c4d7559 | 277 | if (target_size > 0) |
4509de14 | 278 | target_size += prot->overhead_size; |
d829e9c4 | 279 | sk_msg_trim(sk, &rec->msg_encrypted, target_size); |
3c4d7559 DW |
280 | } |
281 | ||
d829e9c4 | 282 | static int tls_alloc_encrypted_msg(struct sock *sk, int len) |
3c4d7559 DW |
283 | { |
284 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
f66de3ee | 285 | struct tls_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx); |
a42055e8 | 286 | struct tls_rec *rec = ctx->open_rec; |
d829e9c4 | 287 | struct sk_msg *msg_en = &rec->msg_encrypted; |
3c4d7559 | 288 | |
d829e9c4 | 289 | return sk_msg_alloc(sk, msg_en, len, 0); |
3c4d7559 DW |
290 | } |
291 | ||
d829e9c4 | 292 | static int tls_clone_plaintext_msg(struct sock *sk, int required) |
3c4d7559 DW |
293 | { |
294 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
4509de14 | 295 | struct tls_prot_info *prot = &tls_ctx->prot_info; |
f66de3ee | 296 | struct tls_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx); |
a42055e8 | 297 | struct tls_rec *rec = ctx->open_rec; |
d829e9c4 DB |
298 | struct sk_msg *msg_pl = &rec->msg_plaintext; |
299 | struct sk_msg *msg_en = &rec->msg_encrypted; | |
4e6d4720 | 300 | int skip, len; |
3c4d7559 | 301 | |
d829e9c4 DB |
302 | /* We add page references worth len bytes from encrypted sg |
303 | * at the end of plaintext sg. It is guaranteed that msg_en | |
4e6d4720 VG |
304 | * has enough required room (ensured by caller). |
305 | */ | |
d829e9c4 | 306 | len = required - msg_pl->sg.size; |
52ea992c | 307 | |
d829e9c4 DB |
308 | /* Skip initial bytes in msg_en's data to be able to use |
309 | * same offset of both plain and encrypted data. | |
4e6d4720 | 310 | */ |
4509de14 | 311 | skip = prot->prepend_size + msg_pl->sg.size; |
4e6d4720 | 312 | |
d829e9c4 | 313 | return sk_msg_clone(sk, msg_pl, msg_en, skip, len); |
3c4d7559 DW |
314 | } |
315 | ||
d3b18ad3 | 316 | static struct tls_rec *tls_get_rec(struct sock *sk) |
3c4d7559 DW |
317 | { |
318 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
4509de14 | 319 | struct tls_prot_info *prot = &tls_ctx->prot_info; |
f66de3ee | 320 | struct tls_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx); |
d3b18ad3 JF |
321 | struct sk_msg *msg_pl, *msg_en; |
322 | struct tls_rec *rec; | |
323 | int mem_size; | |
3c4d7559 | 324 | |
d3b18ad3 JF |
325 | mem_size = sizeof(struct tls_rec) + crypto_aead_reqsize(ctx->aead_send); |
326 | ||
327 | rec = kzalloc(mem_size, sk->sk_allocation); | |
a42055e8 | 328 | if (!rec) |
d3b18ad3 JF |
329 | return NULL; |
330 | ||
331 | msg_pl = &rec->msg_plaintext; | |
332 | msg_en = &rec->msg_encrypted; | |
333 | ||
334 | sk_msg_init(msg_pl); | |
335 | sk_msg_init(msg_en); | |
336 | ||
337 | sg_init_table(rec->sg_aead_in, 2); | |
4509de14 | 338 | sg_set_buf(&rec->sg_aead_in[0], rec->aad_space, prot->aad_size); |
d3b18ad3 JF |
339 | sg_unmark_end(&rec->sg_aead_in[1]); |
340 | ||
341 | sg_init_table(rec->sg_aead_out, 2); | |
4509de14 | 342 | sg_set_buf(&rec->sg_aead_out[0], rec->aad_space, prot->aad_size); |
d3b18ad3 JF |
343 | sg_unmark_end(&rec->sg_aead_out[1]); |
344 | ||
345 | return rec; | |
346 | } | |
a42055e8 | 347 | |
d3b18ad3 JF |
348 | static void tls_free_rec(struct sock *sk, struct tls_rec *rec) |
349 | { | |
d829e9c4 DB |
350 | sk_msg_free(sk, &rec->msg_encrypted); |
351 | sk_msg_free(sk, &rec->msg_plaintext); | |
c774973e | 352 | kfree(rec); |
a42055e8 VG |
353 | } |
354 | ||
d3b18ad3 JF |
355 | static void tls_free_open_rec(struct sock *sk) |
356 | { | |
357 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
358 | struct tls_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx); | |
359 | struct tls_rec *rec = ctx->open_rec; | |
360 | ||
361 | if (rec) { | |
362 | tls_free_rec(sk, rec); | |
363 | ctx->open_rec = NULL; | |
364 | } | |
365 | } | |
366 | ||
a42055e8 VG |
367 | int tls_tx_records(struct sock *sk, int flags) |
368 | { | |
369 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
370 | struct tls_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx); | |
371 | struct tls_rec *rec, *tmp; | |
d829e9c4 | 372 | struct sk_msg *msg_en; |
a42055e8 VG |
373 | int tx_flags, rc = 0; |
374 | ||
375 | if (tls_is_partially_sent_record(tls_ctx)) { | |
9932a29a | 376 | rec = list_first_entry(&ctx->tx_list, |
a42055e8 VG |
377 | struct tls_rec, list); |
378 | ||
379 | if (flags == -1) | |
380 | tx_flags = rec->tx_flags; | |
381 | else | |
382 | tx_flags = flags; | |
383 | ||
384 | rc = tls_push_partial_record(sk, tls_ctx, tx_flags); | |
385 | if (rc) | |
386 | goto tx_err; | |
387 | ||
388 | /* Full record has been transmitted. | |
9932a29a | 389 | * Remove the head of tx_list |
a42055e8 | 390 | */ |
a42055e8 | 391 | list_del(&rec->list); |
d829e9c4 | 392 | sk_msg_free(sk, &rec->msg_plaintext); |
a42055e8 VG |
393 | kfree(rec); |
394 | } | |
395 | ||
9932a29a VG |
396 | /* Tx all ready records */ |
397 | list_for_each_entry_safe(rec, tmp, &ctx->tx_list, list) { | |
398 | if (READ_ONCE(rec->tx_ready)) { | |
a42055e8 VG |
399 | if (flags == -1) |
400 | tx_flags = rec->tx_flags; | |
401 | else | |
402 | tx_flags = flags; | |
403 | ||
d829e9c4 | 404 | msg_en = &rec->msg_encrypted; |
a42055e8 | 405 | rc = tls_push_sg(sk, tls_ctx, |
d829e9c4 | 406 | &msg_en->sg.data[msg_en->sg.curr], |
a42055e8 VG |
407 | 0, tx_flags); |
408 | if (rc) | |
409 | goto tx_err; | |
410 | ||
a42055e8 | 411 | list_del(&rec->list); |
d829e9c4 | 412 | sk_msg_free(sk, &rec->msg_plaintext); |
a42055e8 VG |
413 | kfree(rec); |
414 | } else { | |
415 | break; | |
416 | } | |
417 | } | |
418 | ||
419 | tx_err: | |
420 | if (rc < 0 && rc != -EAGAIN) | |
421 | tls_err_abort(sk, EBADMSG); | |
422 | ||
423 | return rc; | |
424 | } | |
425 | ||
426 | static void tls_encrypt_done(struct crypto_async_request *req, int err) | |
427 | { | |
428 | struct aead_request *aead_req = (struct aead_request *)req; | |
429 | struct sock *sk = req->data; | |
430 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
4509de14 | 431 | struct tls_prot_info *prot = &tls_ctx->prot_info; |
a42055e8 | 432 | struct tls_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx); |
d829e9c4 DB |
433 | struct scatterlist *sge; |
434 | struct sk_msg *msg_en; | |
a42055e8 VG |
435 | struct tls_rec *rec; |
436 | bool ready = false; | |
437 | int pending; | |
438 | ||
439 | rec = container_of(aead_req, struct tls_rec, aead_req); | |
d829e9c4 | 440 | msg_en = &rec->msg_encrypted; |
a42055e8 | 441 | |
d829e9c4 | 442 | sge = sk_msg_elem(msg_en, msg_en->sg.curr); |
4509de14 VG |
443 | sge->offset -= prot->prepend_size; |
444 | sge->length += prot->prepend_size; | |
a42055e8 | 445 | |
80ece6a0 | 446 | /* Check if error is previously set on socket */ |
a42055e8 | 447 | if (err || sk->sk_err) { |
a42055e8 VG |
448 | rec = NULL; |
449 | ||
450 | /* If err is already set on socket, return the same code */ | |
451 | if (sk->sk_err) { | |
452 | ctx->async_wait.err = sk->sk_err; | |
453 | } else { | |
454 | ctx->async_wait.err = err; | |
455 | tls_err_abort(sk, err); | |
456 | } | |
457 | } | |
458 | ||
9932a29a VG |
459 | if (rec) { |
460 | struct tls_rec *first_rec; | |
461 | ||
462 | /* Mark the record as ready for transmission */ | |
463 | smp_store_mb(rec->tx_ready, true); | |
464 | ||
465 | /* If received record is at head of tx_list, schedule tx */ | |
466 | first_rec = list_first_entry(&ctx->tx_list, | |
467 | struct tls_rec, list); | |
468 | if (rec == first_rec) | |
469 | ready = true; | |
470 | } | |
a42055e8 | 471 | |
0cada332 | 472 | spin_lock_bh(&ctx->encrypt_compl_lock); |
a42055e8 VG |
473 | pending = atomic_dec_return(&ctx->encrypt_pending); |
474 | ||
0cada332 | 475 | if (!pending && ctx->async_notify) |
a42055e8 | 476 | complete(&ctx->async_wait.completion); |
0cada332 | 477 | spin_unlock_bh(&ctx->encrypt_compl_lock); |
a42055e8 VG |
478 | |
479 | if (!ready) | |
480 | return; | |
481 | ||
482 | /* Schedule the transmission */ | |
483 | if (!test_and_set_bit(BIT_TX_SCHEDULED, &ctx->tx_bitmask)) | |
d829e9c4 | 484 | schedule_delayed_work(&ctx->tx_work.work, 1); |
3c4d7559 DW |
485 | } |
486 | ||
a42055e8 VG |
487 | static int tls_do_encryption(struct sock *sk, |
488 | struct tls_context *tls_ctx, | |
a447da7d DB |
489 | struct tls_sw_context_tx *ctx, |
490 | struct aead_request *aead_req, | |
d829e9c4 | 491 | size_t data_len, u32 start) |
3c4d7559 | 492 | { |
4509de14 | 493 | struct tls_prot_info *prot = &tls_ctx->prot_info; |
a42055e8 | 494 | struct tls_rec *rec = ctx->open_rec; |
d829e9c4 DB |
495 | struct sk_msg *msg_en = &rec->msg_encrypted; |
496 | struct scatterlist *sge = sk_msg_elem(msg_en, start); | |
f295b3ae VG |
497 | int rc, iv_offset = 0; |
498 | ||
499 | /* For CCM based ciphers, first byte of IV is a constant */ | |
500 | if (prot->cipher_type == TLS_CIPHER_AES_CCM_128) { | |
501 | rec->iv_data[0] = TLS_AES_CCM_IV_B0_BYTE; | |
502 | iv_offset = 1; | |
503 | } | |
504 | ||
505 | memcpy(&rec->iv_data[iv_offset], tls_ctx->tx.iv, | |
506 | prot->iv_size + prot->salt_size); | |
3c4d7559 | 507 | |
f295b3ae | 508 | xor_iv_with_seq(prot->version, rec->iv_data, tls_ctx->tx.rec_seq); |
32eb67b9 | 509 | |
4509de14 VG |
510 | sge->offset += prot->prepend_size; |
511 | sge->length -= prot->prepend_size; | |
3c4d7559 | 512 | |
d829e9c4 | 513 | msg_en->sg.curr = start; |
4e6d4720 | 514 | |
3c4d7559 | 515 | aead_request_set_tfm(aead_req, ctx->aead_send); |
4509de14 | 516 | aead_request_set_ad(aead_req, prot->aad_size); |
d829e9c4 DB |
517 | aead_request_set_crypt(aead_req, rec->sg_aead_in, |
518 | rec->sg_aead_out, | |
32eb67b9 | 519 | data_len, rec->iv_data); |
a54667f6 VG |
520 | |
521 | aead_request_set_callback(aead_req, CRYPTO_TFM_REQ_MAY_BACKLOG, | |
a42055e8 VG |
522 | tls_encrypt_done, sk); |
523 | ||
9932a29a VG |
524 | /* Add the record in tx_list */ |
525 | list_add_tail((struct list_head *)&rec->list, &ctx->tx_list); | |
a42055e8 | 526 | atomic_inc(&ctx->encrypt_pending); |
a54667f6 | 527 | |
a42055e8 VG |
528 | rc = crypto_aead_encrypt(aead_req); |
529 | if (!rc || rc != -EINPROGRESS) { | |
530 | atomic_dec(&ctx->encrypt_pending); | |
4509de14 VG |
531 | sge->offset -= prot->prepend_size; |
532 | sge->length += prot->prepend_size; | |
a42055e8 | 533 | } |
3c4d7559 | 534 | |
9932a29a VG |
535 | if (!rc) { |
536 | WRITE_ONCE(rec->tx_ready, true); | |
537 | } else if (rc != -EINPROGRESS) { | |
538 | list_del(&rec->list); | |
a42055e8 | 539 | return rc; |
9932a29a | 540 | } |
3c4d7559 | 541 | |
a42055e8 VG |
542 | /* Unhook the record from context if encryption is not failure */ |
543 | ctx->open_rec = NULL; | |
fb0f886f | 544 | tls_advance_record_sn(sk, prot, &tls_ctx->tx); |
3c4d7559 DW |
545 | return rc; |
546 | } | |
547 | ||
d3b18ad3 JF |
548 | static int tls_split_open_record(struct sock *sk, struct tls_rec *from, |
549 | struct tls_rec **to, struct sk_msg *msg_opl, | |
550 | struct sk_msg *msg_oen, u32 split_point, | |
551 | u32 tx_overhead_size, u32 *orig_end) | |
552 | { | |
553 | u32 i, j, bytes = 0, apply = msg_opl->apply_bytes; | |
554 | struct scatterlist *sge, *osge, *nsge; | |
555 | u32 orig_size = msg_opl->sg.size; | |
556 | struct scatterlist tmp = { }; | |
557 | struct sk_msg *msg_npl; | |
558 | struct tls_rec *new; | |
559 | int ret; | |
560 | ||
561 | new = tls_get_rec(sk); | |
562 | if (!new) | |
563 | return -ENOMEM; | |
564 | ret = sk_msg_alloc(sk, &new->msg_encrypted, msg_opl->sg.size + | |
565 | tx_overhead_size, 0); | |
566 | if (ret < 0) { | |
567 | tls_free_rec(sk, new); | |
568 | return ret; | |
569 | } | |
570 | ||
571 | *orig_end = msg_opl->sg.end; | |
572 | i = msg_opl->sg.start; | |
573 | sge = sk_msg_elem(msg_opl, i); | |
574 | while (apply && sge->length) { | |
575 | if (sge->length > apply) { | |
576 | u32 len = sge->length - apply; | |
577 | ||
578 | get_page(sg_page(sge)); | |
579 | sg_set_page(&tmp, sg_page(sge), len, | |
580 | sge->offset + apply); | |
581 | sge->length = apply; | |
582 | bytes += apply; | |
583 | apply = 0; | |
584 | } else { | |
585 | apply -= sge->length; | |
586 | bytes += sge->length; | |
587 | } | |
588 | ||
589 | sk_msg_iter_var_next(i); | |
590 | if (i == msg_opl->sg.end) | |
591 | break; | |
592 | sge = sk_msg_elem(msg_opl, i); | |
593 | } | |
594 | ||
595 | msg_opl->sg.end = i; | |
596 | msg_opl->sg.curr = i; | |
597 | msg_opl->sg.copybreak = 0; | |
598 | msg_opl->apply_bytes = 0; | |
599 | msg_opl->sg.size = bytes; | |
600 | ||
601 | msg_npl = &new->msg_plaintext; | |
602 | msg_npl->apply_bytes = apply; | |
603 | msg_npl->sg.size = orig_size - bytes; | |
604 | ||
605 | j = msg_npl->sg.start; | |
606 | nsge = sk_msg_elem(msg_npl, j); | |
607 | if (tmp.length) { | |
608 | memcpy(nsge, &tmp, sizeof(*nsge)); | |
609 | sk_msg_iter_var_next(j); | |
610 | nsge = sk_msg_elem(msg_npl, j); | |
611 | } | |
612 | ||
613 | osge = sk_msg_elem(msg_opl, i); | |
614 | while (osge->length) { | |
615 | memcpy(nsge, osge, sizeof(*nsge)); | |
616 | sg_unmark_end(nsge); | |
617 | sk_msg_iter_var_next(i); | |
618 | sk_msg_iter_var_next(j); | |
619 | if (i == *orig_end) | |
620 | break; | |
621 | osge = sk_msg_elem(msg_opl, i); | |
622 | nsge = sk_msg_elem(msg_npl, j); | |
623 | } | |
624 | ||
625 | msg_npl->sg.end = j; | |
626 | msg_npl->sg.curr = j; | |
627 | msg_npl->sg.copybreak = 0; | |
628 | ||
629 | *to = new; | |
630 | return 0; | |
631 | } | |
632 | ||
633 | static void tls_merge_open_record(struct sock *sk, struct tls_rec *to, | |
634 | struct tls_rec *from, u32 orig_end) | |
635 | { | |
636 | struct sk_msg *msg_npl = &from->msg_plaintext; | |
637 | struct sk_msg *msg_opl = &to->msg_plaintext; | |
638 | struct scatterlist *osge, *nsge; | |
639 | u32 i, j; | |
640 | ||
641 | i = msg_opl->sg.end; | |
642 | sk_msg_iter_var_prev(i); | |
643 | j = msg_npl->sg.start; | |
644 | ||
645 | osge = sk_msg_elem(msg_opl, i); | |
646 | nsge = sk_msg_elem(msg_npl, j); | |
647 | ||
648 | if (sg_page(osge) == sg_page(nsge) && | |
649 | osge->offset + osge->length == nsge->offset) { | |
650 | osge->length += nsge->length; | |
651 | put_page(sg_page(nsge)); | |
652 | } | |
653 | ||
654 | msg_opl->sg.end = orig_end; | |
655 | msg_opl->sg.curr = orig_end; | |
656 | msg_opl->sg.copybreak = 0; | |
657 | msg_opl->apply_bytes = msg_opl->sg.size + msg_npl->sg.size; | |
658 | msg_opl->sg.size += msg_npl->sg.size; | |
659 | ||
660 | sk_msg_free(sk, &to->msg_encrypted); | |
661 | sk_msg_xfer_full(&to->msg_encrypted, &from->msg_encrypted); | |
662 | ||
663 | kfree(from); | |
664 | } | |
665 | ||
3c4d7559 DW |
666 | static int tls_push_record(struct sock *sk, int flags, |
667 | unsigned char record_type) | |
668 | { | |
669 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
4509de14 | 670 | struct tls_prot_info *prot = &tls_ctx->prot_info; |
f66de3ee | 671 | struct tls_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx); |
d3b18ad3 | 672 | struct tls_rec *rec = ctx->open_rec, *tmp = NULL; |
3f649ab7 | 673 | u32 i, split_point, orig_end; |
d829e9c4 | 674 | struct sk_msg *msg_pl, *msg_en; |
a447da7d | 675 | struct aead_request *req; |
d3b18ad3 | 676 | bool split; |
3c4d7559 DW |
677 | int rc; |
678 | ||
a42055e8 VG |
679 | if (!rec) |
680 | return 0; | |
a447da7d | 681 | |
d829e9c4 DB |
682 | msg_pl = &rec->msg_plaintext; |
683 | msg_en = &rec->msg_encrypted; | |
684 | ||
d3b18ad3 JF |
685 | split_point = msg_pl->apply_bytes; |
686 | split = split_point && split_point < msg_pl->sg.size; | |
d468e477 JF |
687 | if (unlikely((!split && |
688 | msg_pl->sg.size + | |
689 | prot->overhead_size > msg_en->sg.size) || | |
690 | (split && | |
691 | split_point + | |
692 | prot->overhead_size > msg_en->sg.size))) { | |
693 | split = true; | |
694 | split_point = msg_en->sg.size; | |
695 | } | |
d3b18ad3 JF |
696 | if (split) { |
697 | rc = tls_split_open_record(sk, rec, &tmp, msg_pl, msg_en, | |
4509de14 | 698 | split_point, prot->overhead_size, |
d3b18ad3 JF |
699 | &orig_end); |
700 | if (rc < 0) | |
701 | return rc; | |
d468e477 JF |
702 | /* This can happen if above tls_split_open_record allocates |
703 | * a single large encryption buffer instead of two smaller | |
704 | * ones. In this case adjust pointers and continue without | |
705 | * split. | |
706 | */ | |
707 | if (!msg_pl->sg.size) { | |
708 | tls_merge_open_record(sk, rec, tmp, orig_end); | |
709 | msg_pl = &rec->msg_plaintext; | |
710 | msg_en = &rec->msg_encrypted; | |
711 | split = false; | |
712 | } | |
d3b18ad3 | 713 | sk_msg_trim(sk, msg_en, msg_pl->sg.size + |
4509de14 | 714 | prot->overhead_size); |
d3b18ad3 JF |
715 | } |
716 | ||
a42055e8 VG |
717 | rec->tx_flags = flags; |
718 | req = &rec->aead_req; | |
3c4d7559 | 719 | |
d829e9c4 DB |
720 | i = msg_pl->sg.end; |
721 | sk_msg_iter_var_prev(i); | |
130b392c DW |
722 | |
723 | rec->content_type = record_type; | |
4509de14 | 724 | if (prot->version == TLS_1_3_VERSION) { |
130b392c DW |
725 | /* Add content type to end of message. No padding added */ |
726 | sg_set_buf(&rec->sg_content_type, &rec->content_type, 1); | |
727 | sg_mark_end(&rec->sg_content_type); | |
728 | sg_chain(msg_pl->sg.data, msg_pl->sg.end + 1, | |
729 | &rec->sg_content_type); | |
730 | } else { | |
731 | sg_mark_end(sk_msg_elem(msg_pl, i)); | |
732 | } | |
a42055e8 | 733 | |
9aaaa568 JF |
734 | if (msg_pl->sg.end < msg_pl->sg.start) { |
735 | sg_chain(&msg_pl->sg.data[msg_pl->sg.start], | |
736 | MAX_SKB_FRAGS - msg_pl->sg.start + 1, | |
737 | msg_pl->sg.data); | |
738 | } | |
739 | ||
d829e9c4 | 740 | i = msg_pl->sg.start; |
9e5ffed3 | 741 | sg_chain(rec->sg_aead_in, 2, &msg_pl->sg.data[i]); |
d829e9c4 DB |
742 | |
743 | i = msg_en->sg.end; | |
744 | sk_msg_iter_var_prev(i); | |
745 | sg_mark_end(sk_msg_elem(msg_en, i)); | |
746 | ||
747 | i = msg_en->sg.start; | |
748 | sg_chain(rec->sg_aead_out, 2, &msg_en->sg.data[i]); | |
749 | ||
4509de14 VG |
750 | tls_make_aad(rec->aad_space, msg_pl->sg.size + prot->tail_size, |
751 | tls_ctx->tx.rec_seq, prot->rec_seq_size, | |
752 | record_type, prot->version); | |
3c4d7559 DW |
753 | |
754 | tls_fill_prepend(tls_ctx, | |
d829e9c4 | 755 | page_address(sg_page(&msg_en->sg.data[i])) + |
130b392c | 756 | msg_en->sg.data[i].offset, |
4509de14 VG |
757 | msg_pl->sg.size + prot->tail_size, |
758 | record_type, prot->version); | |
3c4d7559 | 759 | |
d829e9c4 | 760 | tls_ctx->pending_open_record_frags = false; |
3c4d7559 | 761 | |
130b392c | 762 | rc = tls_do_encryption(sk, tls_ctx, ctx, req, |
4509de14 | 763 | msg_pl->sg.size + prot->tail_size, i); |
a42055e8 | 764 | if (rc < 0) { |
d3b18ad3 | 765 | if (rc != -EINPROGRESS) { |
d829e9c4 | 766 | tls_err_abort(sk, EBADMSG); |
d3b18ad3 JF |
767 | if (split) { |
768 | tls_ctx->pending_open_record_frags = true; | |
769 | tls_merge_open_record(sk, rec, tmp, orig_end); | |
770 | } | |
771 | } | |
5b053e12 | 772 | ctx->async_capable = 1; |
a42055e8 | 773 | return rc; |
d3b18ad3 JF |
774 | } else if (split) { |
775 | msg_pl = &tmp->msg_plaintext; | |
776 | msg_en = &tmp->msg_encrypted; | |
4509de14 | 777 | sk_msg_trim(sk, msg_en, msg_pl->sg.size + prot->overhead_size); |
d3b18ad3 JF |
778 | tls_ctx->pending_open_record_frags = true; |
779 | ctx->open_rec = tmp; | |
a42055e8 | 780 | } |
3c4d7559 | 781 | |
9932a29a | 782 | return tls_tx_records(sk, flags); |
3c4d7559 DW |
783 | } |
784 | ||
d3b18ad3 JF |
785 | static int bpf_exec_tx_verdict(struct sk_msg *msg, struct sock *sk, |
786 | bool full_record, u8 record_type, | |
a7bff11f | 787 | ssize_t *copied, int flags) |
3c4d7559 DW |
788 | { |
789 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
f66de3ee | 790 | struct tls_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx); |
d3b18ad3 JF |
791 | struct sk_msg msg_redir = { }; |
792 | struct sk_psock *psock; | |
793 | struct sock *sk_redir; | |
a42055e8 | 794 | struct tls_rec *rec; |
0608c69c | 795 | bool enospc, policy; |
d3b18ad3 | 796 | int err = 0, send; |
7246d8ed | 797 | u32 delta = 0; |
d3b18ad3 | 798 | |
0608c69c | 799 | policy = !(flags & MSG_SENDPAGE_NOPOLICY); |
d3b18ad3 | 800 | psock = sk_psock_get(sk); |
d10523d0 JK |
801 | if (!psock || !policy) { |
802 | err = tls_push_record(sk, flags, record_type); | |
635d9398 | 803 | if (err && sk->sk_err == EBADMSG) { |
d10523d0 JK |
804 | *copied -= sk_msg_free(sk, msg); |
805 | tls_free_open_rec(sk); | |
635d9398 | 806 | err = -sk->sk_err; |
d10523d0 | 807 | } |
095f5614 XY |
808 | if (psock) |
809 | sk_psock_put(sk, psock); | |
d10523d0 JK |
810 | return err; |
811 | } | |
d3b18ad3 JF |
812 | more_data: |
813 | enospc = sk_msg_full(msg); | |
7246d8ed JF |
814 | if (psock->eval == __SK_NONE) { |
815 | delta = msg->sg.size; | |
d3b18ad3 | 816 | psock->eval = sk_psock_msg_verdict(sk, psock, msg); |
7361d448 | 817 | delta -= msg->sg.size; |
7246d8ed | 818 | } |
d3b18ad3 JF |
819 | if (msg->cork_bytes && msg->cork_bytes > msg->sg.size && |
820 | !enospc && !full_record) { | |
821 | err = -ENOSPC; | |
822 | goto out_err; | |
823 | } | |
824 | msg->cork_bytes = 0; | |
825 | send = msg->sg.size; | |
826 | if (msg->apply_bytes && msg->apply_bytes < send) | |
827 | send = msg->apply_bytes; | |
828 | ||
829 | switch (psock->eval) { | |
830 | case __SK_PASS: | |
831 | err = tls_push_record(sk, flags, record_type); | |
635d9398 | 832 | if (err && sk->sk_err == EBADMSG) { |
d3b18ad3 JF |
833 | *copied -= sk_msg_free(sk, msg); |
834 | tls_free_open_rec(sk); | |
635d9398 | 835 | err = -sk->sk_err; |
d3b18ad3 JF |
836 | goto out_err; |
837 | } | |
838 | break; | |
839 | case __SK_REDIRECT: | |
840 | sk_redir = psock->sk_redir; | |
841 | memcpy(&msg_redir, msg, sizeof(*msg)); | |
842 | if (msg->apply_bytes < send) | |
843 | msg->apply_bytes = 0; | |
844 | else | |
845 | msg->apply_bytes -= send; | |
846 | sk_msg_return_zero(sk, msg, send); | |
847 | msg->sg.size -= send; | |
848 | release_sock(sk); | |
849 | err = tcp_bpf_sendmsg_redir(sk_redir, &msg_redir, send, flags); | |
850 | lock_sock(sk); | |
851 | if (err < 0) { | |
852 | *copied -= sk_msg_free_nocharge(sk, &msg_redir); | |
853 | msg->sg.size = 0; | |
854 | } | |
855 | if (msg->sg.size == 0) | |
856 | tls_free_open_rec(sk); | |
857 | break; | |
858 | case __SK_DROP: | |
859 | default: | |
860 | sk_msg_free_partial(sk, msg, send); | |
861 | if (msg->apply_bytes < send) | |
862 | msg->apply_bytes = 0; | |
863 | else | |
864 | msg->apply_bytes -= send; | |
865 | if (msg->sg.size == 0) | |
866 | tls_free_open_rec(sk); | |
7246d8ed | 867 | *copied -= (send + delta); |
d3b18ad3 JF |
868 | err = -EACCES; |
869 | } | |
a42055e8 | 870 | |
d3b18ad3 JF |
871 | if (likely(!err)) { |
872 | bool reset_eval = !ctx->open_rec; | |
a42055e8 | 873 | |
d3b18ad3 JF |
874 | rec = ctx->open_rec; |
875 | if (rec) { | |
876 | msg = &rec->msg_plaintext; | |
877 | if (!msg->apply_bytes) | |
878 | reset_eval = true; | |
879 | } | |
880 | if (reset_eval) { | |
881 | psock->eval = __SK_NONE; | |
882 | if (psock->sk_redir) { | |
883 | sock_put(psock->sk_redir); | |
884 | psock->sk_redir = NULL; | |
885 | } | |
886 | } | |
887 | if (rec) | |
888 | goto more_data; | |
889 | } | |
890 | out_err: | |
891 | sk_psock_put(sk, psock); | |
892 | return err; | |
893 | } | |
894 | ||
895 | static int tls_sw_push_pending_record(struct sock *sk, int flags) | |
896 | { | |
897 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
898 | struct tls_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx); | |
899 | struct tls_rec *rec = ctx->open_rec; | |
900 | struct sk_msg *msg_pl; | |
901 | size_t copied; | |
a42055e8 | 902 | |
a42055e8 | 903 | if (!rec) |
d3b18ad3 | 904 | return 0; |
a42055e8 | 905 | |
d829e9c4 | 906 | msg_pl = &rec->msg_plaintext; |
d3b18ad3 JF |
907 | copied = msg_pl->sg.size; |
908 | if (!copied) | |
909 | return 0; | |
a42055e8 | 910 | |
d3b18ad3 JF |
911 | return bpf_exec_tx_verdict(msg_pl, sk, true, TLS_RECORD_TYPE_DATA, |
912 | &copied, flags); | |
a42055e8 VG |
913 | } |
914 | ||
915 | int tls_sw_sendmsg(struct sock *sk, struct msghdr *msg, size_t size) | |
916 | { | |
3c4d7559 | 917 | long timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT); |
a42055e8 | 918 | struct tls_context *tls_ctx = tls_get_ctx(sk); |
4509de14 | 919 | struct tls_prot_info *prot = &tls_ctx->prot_info; |
a42055e8 | 920 | struct tls_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx); |
5b053e12 | 921 | bool async_capable = ctx->async_capable; |
a42055e8 | 922 | unsigned char record_type = TLS_RECORD_TYPE_DATA; |
00e23707 | 923 | bool is_kvec = iov_iter_is_kvec(&msg->msg_iter); |
3c4d7559 | 924 | bool eor = !(msg->msg_flags & MSG_MORE); |
a7bff11f VF |
925 | size_t try_to_copy; |
926 | ssize_t copied = 0; | |
d829e9c4 | 927 | struct sk_msg *msg_pl, *msg_en; |
a42055e8 VG |
928 | struct tls_rec *rec; |
929 | int required_size; | |
930 | int num_async = 0; | |
3c4d7559 | 931 | bool full_record; |
a42055e8 VG |
932 | int record_room; |
933 | int num_zc = 0; | |
3c4d7559 | 934 | int orig_size; |
4128c0cf | 935 | int ret = 0; |
0cada332 | 936 | int pending; |
3c4d7559 DW |
937 | |
938 | if (msg->msg_flags & ~(MSG_MORE | MSG_DONTWAIT | MSG_NOSIGNAL)) | |
4a5cdc60 | 939 | return -EOPNOTSUPP; |
3c4d7559 | 940 | |
79ffe608 | 941 | mutex_lock(&tls_ctx->tx_lock); |
3c4d7559 DW |
942 | lock_sock(sk); |
943 | ||
3c4d7559 DW |
944 | if (unlikely(msg->msg_controllen)) { |
945 | ret = tls_proccess_cmsg(sk, msg, &record_type); | |
a42055e8 VG |
946 | if (ret) { |
947 | if (ret == -EINPROGRESS) | |
948 | num_async++; | |
949 | else if (ret != -EAGAIN) | |
950 | goto send_end; | |
951 | } | |
3c4d7559 DW |
952 | } |
953 | ||
954 | while (msg_data_left(msg)) { | |
955 | if (sk->sk_err) { | |
30be8f8d | 956 | ret = -sk->sk_err; |
3c4d7559 DW |
957 | goto send_end; |
958 | } | |
959 | ||
d3b18ad3 JF |
960 | if (ctx->open_rec) |
961 | rec = ctx->open_rec; | |
962 | else | |
963 | rec = ctx->open_rec = tls_get_rec(sk); | |
a42055e8 VG |
964 | if (!rec) { |
965 | ret = -ENOMEM; | |
966 | goto send_end; | |
967 | } | |
968 | ||
d829e9c4 DB |
969 | msg_pl = &rec->msg_plaintext; |
970 | msg_en = &rec->msg_encrypted; | |
971 | ||
972 | orig_size = msg_pl->sg.size; | |
3c4d7559 DW |
973 | full_record = false; |
974 | try_to_copy = msg_data_left(msg); | |
d829e9c4 | 975 | record_room = TLS_MAX_PAYLOAD_SIZE - msg_pl->sg.size; |
3c4d7559 DW |
976 | if (try_to_copy >= record_room) { |
977 | try_to_copy = record_room; | |
978 | full_record = true; | |
979 | } | |
980 | ||
d829e9c4 | 981 | required_size = msg_pl->sg.size + try_to_copy + |
4509de14 | 982 | prot->overhead_size; |
3c4d7559 DW |
983 | |
984 | if (!sk_stream_memory_free(sk)) | |
985 | goto wait_for_sndbuf; | |
a42055e8 | 986 | |
3c4d7559 | 987 | alloc_encrypted: |
d829e9c4 | 988 | ret = tls_alloc_encrypted_msg(sk, required_size); |
3c4d7559 DW |
989 | if (ret) { |
990 | if (ret != -ENOSPC) | |
991 | goto wait_for_memory; | |
992 | ||
993 | /* Adjust try_to_copy according to the amount that was | |
994 | * actually allocated. The difference is due | |
995 | * to max sg elements limit | |
996 | */ | |
d829e9c4 | 997 | try_to_copy -= required_size - msg_en->sg.size; |
3c4d7559 DW |
998 | full_record = true; |
999 | } | |
a42055e8 VG |
1000 | |
1001 | if (!is_kvec && (full_record || eor) && !async_capable) { | |
d3b18ad3 JF |
1002 | u32 first = msg_pl->sg.end; |
1003 | ||
d829e9c4 DB |
1004 | ret = sk_msg_zerocopy_from_iter(sk, &msg->msg_iter, |
1005 | msg_pl, try_to_copy); | |
3c4d7559 DW |
1006 | if (ret) |
1007 | goto fallback_to_reg_send; | |
1008 | ||
a42055e8 | 1009 | num_zc++; |
3c4d7559 | 1010 | copied += try_to_copy; |
d3b18ad3 JF |
1011 | |
1012 | sk_msg_sg_copy_set(msg_pl, first); | |
1013 | ret = bpf_exec_tx_verdict(msg_pl, sk, full_record, | |
1014 | record_type, &copied, | |
1015 | msg->msg_flags); | |
a42055e8 VG |
1016 | if (ret) { |
1017 | if (ret == -EINPROGRESS) | |
1018 | num_async++; | |
d3b18ad3 JF |
1019 | else if (ret == -ENOMEM) |
1020 | goto wait_for_memory; | |
c329ef96 | 1021 | else if (ctx->open_rec && ret == -ENOSPC) |
d3b18ad3 | 1022 | goto rollback_iter; |
a42055e8 VG |
1023 | else if (ret != -EAGAIN) |
1024 | goto send_end; | |
1025 | } | |
5a3611ef | 1026 | continue; |
d3b18ad3 JF |
1027 | rollback_iter: |
1028 | copied -= try_to_copy; | |
1029 | sk_msg_sg_copy_clear(msg_pl, first); | |
1030 | iov_iter_revert(&msg->msg_iter, | |
1031 | msg_pl->sg.size - orig_size); | |
3c4d7559 | 1032 | fallback_to_reg_send: |
d829e9c4 | 1033 | sk_msg_trim(sk, msg_pl, orig_size); |
3c4d7559 DW |
1034 | } |
1035 | ||
d829e9c4 | 1036 | required_size = msg_pl->sg.size + try_to_copy; |
4e6d4720 | 1037 | |
d829e9c4 | 1038 | ret = tls_clone_plaintext_msg(sk, required_size); |
3c4d7559 DW |
1039 | if (ret) { |
1040 | if (ret != -ENOSPC) | |
4e6d4720 | 1041 | goto send_end; |
3c4d7559 DW |
1042 | |
1043 | /* Adjust try_to_copy according to the amount that was | |
1044 | * actually allocated. The difference is due | |
1045 | * to max sg elements limit | |
1046 | */ | |
d829e9c4 | 1047 | try_to_copy -= required_size - msg_pl->sg.size; |
3c4d7559 | 1048 | full_record = true; |
4509de14 VG |
1049 | sk_msg_trim(sk, msg_en, |
1050 | msg_pl->sg.size + prot->overhead_size); | |
3c4d7559 DW |
1051 | } |
1052 | ||
65a10e28 VG |
1053 | if (try_to_copy) { |
1054 | ret = sk_msg_memcopy_from_iter(sk, &msg->msg_iter, | |
1055 | msg_pl, try_to_copy); | |
1056 | if (ret < 0) | |
1057 | goto trim_sgl; | |
1058 | } | |
3c4d7559 | 1059 | |
d829e9c4 DB |
1060 | /* Open records defined only if successfully copied, otherwise |
1061 | * we would trim the sg but not reset the open record frags. | |
1062 | */ | |
1063 | tls_ctx->pending_open_record_frags = true; | |
3c4d7559 DW |
1064 | copied += try_to_copy; |
1065 | if (full_record || eor) { | |
d3b18ad3 JF |
1066 | ret = bpf_exec_tx_verdict(msg_pl, sk, full_record, |
1067 | record_type, &copied, | |
1068 | msg->msg_flags); | |
3c4d7559 | 1069 | if (ret) { |
a42055e8 VG |
1070 | if (ret == -EINPROGRESS) |
1071 | num_async++; | |
d3b18ad3 JF |
1072 | else if (ret == -ENOMEM) |
1073 | goto wait_for_memory; | |
1074 | else if (ret != -EAGAIN) { | |
1075 | if (ret == -ENOSPC) | |
1076 | ret = 0; | |
a42055e8 | 1077 | goto send_end; |
d3b18ad3 | 1078 | } |
3c4d7559 DW |
1079 | } |
1080 | } | |
1081 | ||
1082 | continue; | |
1083 | ||
1084 | wait_for_sndbuf: | |
1085 | set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); | |
1086 | wait_for_memory: | |
1087 | ret = sk_stream_wait_memory(sk, &timeo); | |
1088 | if (ret) { | |
1089 | trim_sgl: | |
c329ef96 JK |
1090 | if (ctx->open_rec) |
1091 | tls_trim_both_msgs(sk, orig_size); | |
3c4d7559 DW |
1092 | goto send_end; |
1093 | } | |
1094 | ||
c329ef96 | 1095 | if (ctx->open_rec && msg_en->sg.size < required_size) |
3c4d7559 | 1096 | goto alloc_encrypted; |
3c4d7559 DW |
1097 | } |
1098 | ||
a42055e8 VG |
1099 | if (!num_async) { |
1100 | goto send_end; | |
1101 | } else if (num_zc) { | |
1102 | /* Wait for pending encryptions to get completed */ | |
0cada332 VKY |
1103 | spin_lock_bh(&ctx->encrypt_compl_lock); |
1104 | ctx->async_notify = true; | |
a42055e8 | 1105 | |
0cada332 VKY |
1106 | pending = atomic_read(&ctx->encrypt_pending); |
1107 | spin_unlock_bh(&ctx->encrypt_compl_lock); | |
1108 | if (pending) | |
a42055e8 VG |
1109 | crypto_wait_req(-EINPROGRESS, &ctx->async_wait); |
1110 | else | |
1111 | reinit_completion(&ctx->async_wait.completion); | |
1112 | ||
0cada332 VKY |
1113 | /* There can be no concurrent accesses, since we have no |
1114 | * pending encrypt operations | |
1115 | */ | |
a42055e8 VG |
1116 | WRITE_ONCE(ctx->async_notify, false); |
1117 | ||
1118 | if (ctx->async_wait.err) { | |
1119 | ret = ctx->async_wait.err; | |
1120 | copied = 0; | |
1121 | } | |
1122 | } | |
1123 | ||
1124 | /* Transmit if any encryptions have completed */ | |
1125 | if (test_and_clear_bit(BIT_TX_SCHEDULED, &ctx->tx_bitmask)) { | |
1126 | cancel_delayed_work(&ctx->tx_work.work); | |
1127 | tls_tx_records(sk, msg->msg_flags); | |
1128 | } | |
1129 | ||
3c4d7559 DW |
1130 | send_end: |
1131 | ret = sk_stream_error(sk, msg->msg_flags, ret); | |
1132 | ||
1133 | release_sock(sk); | |
79ffe608 | 1134 | mutex_unlock(&tls_ctx->tx_lock); |
a7bff11f | 1135 | return copied > 0 ? copied : ret; |
3c4d7559 DW |
1136 | } |
1137 | ||
01cb8a1a Y |
1138 | static int tls_sw_do_sendpage(struct sock *sk, struct page *page, |
1139 | int offset, size_t size, int flags) | |
3c4d7559 | 1140 | { |
a42055e8 | 1141 | long timeo = sock_sndtimeo(sk, flags & MSG_DONTWAIT); |
3c4d7559 | 1142 | struct tls_context *tls_ctx = tls_get_ctx(sk); |
f66de3ee | 1143 | struct tls_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx); |
4509de14 | 1144 | struct tls_prot_info *prot = &tls_ctx->prot_info; |
3c4d7559 | 1145 | unsigned char record_type = TLS_RECORD_TYPE_DATA; |
d829e9c4 | 1146 | struct sk_msg *msg_pl; |
a42055e8 VG |
1147 | struct tls_rec *rec; |
1148 | int num_async = 0; | |
a7bff11f | 1149 | ssize_t copied = 0; |
3c4d7559 DW |
1150 | bool full_record; |
1151 | int record_room; | |
4128c0cf | 1152 | int ret = 0; |
a42055e8 | 1153 | bool eor; |
3c4d7559 | 1154 | |
3c4d7559 | 1155 | eor = !(flags & (MSG_MORE | MSG_SENDPAGE_NOTLAST)); |
3c4d7559 DW |
1156 | sk_clear_bit(SOCKWQ_ASYNC_NOSPACE, sk); |
1157 | ||
3c4d7559 DW |
1158 | /* Call the sk_stream functions to manage the sndbuf mem. */ |
1159 | while (size > 0) { | |
1160 | size_t copy, required_size; | |
1161 | ||
1162 | if (sk->sk_err) { | |
30be8f8d | 1163 | ret = -sk->sk_err; |
3c4d7559 DW |
1164 | goto sendpage_end; |
1165 | } | |
1166 | ||
d3b18ad3 JF |
1167 | if (ctx->open_rec) |
1168 | rec = ctx->open_rec; | |
1169 | else | |
1170 | rec = ctx->open_rec = tls_get_rec(sk); | |
a42055e8 VG |
1171 | if (!rec) { |
1172 | ret = -ENOMEM; | |
1173 | goto sendpage_end; | |
1174 | } | |
1175 | ||
d829e9c4 DB |
1176 | msg_pl = &rec->msg_plaintext; |
1177 | ||
3c4d7559 | 1178 | full_record = false; |
d829e9c4 | 1179 | record_room = TLS_MAX_PAYLOAD_SIZE - msg_pl->sg.size; |
3c4d7559 DW |
1180 | copy = size; |
1181 | if (copy >= record_room) { | |
1182 | copy = record_room; | |
1183 | full_record = true; | |
1184 | } | |
d829e9c4 | 1185 | |
4509de14 | 1186 | required_size = msg_pl->sg.size + copy + prot->overhead_size; |
3c4d7559 DW |
1187 | |
1188 | if (!sk_stream_memory_free(sk)) | |
1189 | goto wait_for_sndbuf; | |
1190 | alloc_payload: | |
d829e9c4 | 1191 | ret = tls_alloc_encrypted_msg(sk, required_size); |
3c4d7559 DW |
1192 | if (ret) { |
1193 | if (ret != -ENOSPC) | |
1194 | goto wait_for_memory; | |
1195 | ||
1196 | /* Adjust copy according to the amount that was | |
1197 | * actually allocated. The difference is due | |
1198 | * to max sg elements limit | |
1199 | */ | |
d829e9c4 | 1200 | copy -= required_size - msg_pl->sg.size; |
3c4d7559 DW |
1201 | full_record = true; |
1202 | } | |
1203 | ||
d829e9c4 | 1204 | sk_msg_page_add(msg_pl, page, copy, offset); |
3c4d7559 | 1205 | sk_mem_charge(sk, copy); |
d829e9c4 | 1206 | |
3c4d7559 DW |
1207 | offset += copy; |
1208 | size -= copy; | |
d3b18ad3 | 1209 | copied += copy; |
3c4d7559 | 1210 | |
d829e9c4 DB |
1211 | tls_ctx->pending_open_record_frags = true; |
1212 | if (full_record || eor || sk_msg_full(msg_pl)) { | |
d3b18ad3 JF |
1213 | ret = bpf_exec_tx_verdict(msg_pl, sk, full_record, |
1214 | record_type, &copied, flags); | |
3c4d7559 | 1215 | if (ret) { |
a42055e8 VG |
1216 | if (ret == -EINPROGRESS) |
1217 | num_async++; | |
d3b18ad3 JF |
1218 | else if (ret == -ENOMEM) |
1219 | goto wait_for_memory; | |
1220 | else if (ret != -EAGAIN) { | |
1221 | if (ret == -ENOSPC) | |
1222 | ret = 0; | |
a42055e8 | 1223 | goto sendpage_end; |
d3b18ad3 | 1224 | } |
3c4d7559 DW |
1225 | } |
1226 | } | |
1227 | continue; | |
1228 | wait_for_sndbuf: | |
1229 | set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); | |
1230 | wait_for_memory: | |
1231 | ret = sk_stream_wait_memory(sk, &timeo); | |
1232 | if (ret) { | |
c329ef96 JK |
1233 | if (ctx->open_rec) |
1234 | tls_trim_both_msgs(sk, msg_pl->sg.size); | |
3c4d7559 DW |
1235 | goto sendpage_end; |
1236 | } | |
1237 | ||
c329ef96 JK |
1238 | if (ctx->open_rec) |
1239 | goto alloc_payload; | |
3c4d7559 DW |
1240 | } |
1241 | ||
a42055e8 VG |
1242 | if (num_async) { |
1243 | /* Transmit if any encryptions have completed */ | |
1244 | if (test_and_clear_bit(BIT_TX_SCHEDULED, &ctx->tx_bitmask)) { | |
1245 | cancel_delayed_work(&ctx->tx_work.work); | |
1246 | tls_tx_records(sk, flags); | |
1247 | } | |
1248 | } | |
3c4d7559 | 1249 | sendpage_end: |
d3b18ad3 | 1250 | ret = sk_stream_error(sk, flags, ret); |
a7bff11f | 1251 | return copied > 0 ? copied : ret; |
3c4d7559 DW |
1252 | } |
1253 | ||
d4ffb02d WB |
1254 | int tls_sw_sendpage_locked(struct sock *sk, struct page *page, |
1255 | int offset, size_t size, int flags) | |
1256 | { | |
1257 | if (flags & ~(MSG_MORE | MSG_DONTWAIT | MSG_NOSIGNAL | | |
1258 | MSG_SENDPAGE_NOTLAST | MSG_SENDPAGE_NOPOLICY | | |
1259 | MSG_NO_SHARED_FRAGS)) | |
4a5cdc60 | 1260 | return -EOPNOTSUPP; |
d4ffb02d WB |
1261 | |
1262 | return tls_sw_do_sendpage(sk, page, offset, size, flags); | |
1263 | } | |
1264 | ||
0608c69c JF |
1265 | int tls_sw_sendpage(struct sock *sk, struct page *page, |
1266 | int offset, size_t size, int flags) | |
1267 | { | |
79ffe608 | 1268 | struct tls_context *tls_ctx = tls_get_ctx(sk); |
0608c69c JF |
1269 | int ret; |
1270 | ||
1271 | if (flags & ~(MSG_MORE | MSG_DONTWAIT | MSG_NOSIGNAL | | |
1272 | MSG_SENDPAGE_NOTLAST | MSG_SENDPAGE_NOPOLICY)) | |
4a5cdc60 | 1273 | return -EOPNOTSUPP; |
0608c69c | 1274 | |
79ffe608 | 1275 | mutex_lock(&tls_ctx->tx_lock); |
0608c69c JF |
1276 | lock_sock(sk); |
1277 | ret = tls_sw_do_sendpage(sk, page, offset, size, flags); | |
1278 | release_sock(sk); | |
79ffe608 | 1279 | mutex_unlock(&tls_ctx->tx_lock); |
0608c69c JF |
1280 | return ret; |
1281 | } | |
1282 | ||
d3b18ad3 JF |
1283 | static struct sk_buff *tls_wait_data(struct sock *sk, struct sk_psock *psock, |
1284 | int flags, long timeo, int *err) | |
c46234eb DW |
1285 | { |
1286 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
f66de3ee | 1287 | struct tls_sw_context_rx *ctx = tls_sw_ctx_rx(tls_ctx); |
c46234eb DW |
1288 | struct sk_buff *skb; |
1289 | DEFINE_WAIT_FUNC(wait, woken_wake_function); | |
1290 | ||
d3b18ad3 | 1291 | while (!(skb = ctx->recv_pkt) && sk_psock_queue_empty(psock)) { |
c46234eb DW |
1292 | if (sk->sk_err) { |
1293 | *err = sock_error(sk); | |
1294 | return NULL; | |
1295 | } | |
1296 | ||
fcf4793e DRK |
1297 | if (sk->sk_shutdown & RCV_SHUTDOWN) |
1298 | return NULL; | |
1299 | ||
c46234eb DW |
1300 | if (sock_flag(sk, SOCK_DONE)) |
1301 | return NULL; | |
1302 | ||
1303 | if ((flags & MSG_DONTWAIT) || !timeo) { | |
1304 | *err = -EAGAIN; | |
1305 | return NULL; | |
1306 | } | |
1307 | ||
1308 | add_wait_queue(sk_sleep(sk), &wait); | |
1309 | sk_set_bit(SOCKWQ_ASYNC_WAITDATA, sk); | |
d3b18ad3 JF |
1310 | sk_wait_event(sk, &timeo, |
1311 | ctx->recv_pkt != skb || | |
1312 | !sk_psock_queue_empty(psock), | |
1313 | &wait); | |
c46234eb DW |
1314 | sk_clear_bit(SOCKWQ_ASYNC_WAITDATA, sk); |
1315 | remove_wait_queue(sk_sleep(sk), &wait); | |
1316 | ||
1317 | /* Handle signals */ | |
1318 | if (signal_pending(current)) { | |
1319 | *err = sock_intr_errno(timeo); | |
1320 | return NULL; | |
1321 | } | |
1322 | } | |
1323 | ||
1324 | return skb; | |
1325 | } | |
1326 | ||
d829e9c4 DB |
1327 | static int tls_setup_from_iter(struct sock *sk, struct iov_iter *from, |
1328 | int length, int *pages_used, | |
1329 | unsigned int *size_used, | |
1330 | struct scatterlist *to, | |
1331 | int to_max_pages) | |
1332 | { | |
1333 | int rc = 0, i = 0, num_elem = *pages_used, maxpages; | |
1334 | struct page *pages[MAX_SKB_FRAGS]; | |
1335 | unsigned int size = *size_used; | |
1336 | ssize_t copied, use; | |
1337 | size_t offset; | |
1338 | ||
1339 | while (length > 0) { | |
1340 | i = 0; | |
1341 | maxpages = to_max_pages - num_elem; | |
1342 | if (maxpages == 0) { | |
1343 | rc = -EFAULT; | |
1344 | goto out; | |
1345 | } | |
1346 | copied = iov_iter_get_pages(from, pages, | |
1347 | length, | |
1348 | maxpages, &offset); | |
1349 | if (copied <= 0) { | |
1350 | rc = -EFAULT; | |
1351 | goto out; | |
1352 | } | |
1353 | ||
1354 | iov_iter_advance(from, copied); | |
1355 | ||
1356 | length -= copied; | |
1357 | size += copied; | |
1358 | while (copied) { | |
1359 | use = min_t(int, copied, PAGE_SIZE - offset); | |
1360 | ||
1361 | sg_set_page(&to[num_elem], | |
1362 | pages[i], use, offset); | |
1363 | sg_unmark_end(&to[num_elem]); | |
1364 | /* We do not uncharge memory from this API */ | |
1365 | ||
1366 | offset = 0; | |
1367 | copied -= use; | |
1368 | ||
1369 | i++; | |
1370 | num_elem++; | |
1371 | } | |
1372 | } | |
1373 | /* Mark the end in the last sg entry if newly added */ | |
1374 | if (num_elem > *pages_used) | |
1375 | sg_mark_end(&to[num_elem - 1]); | |
1376 | out: | |
1377 | if (rc) | |
1378 | iov_iter_revert(from, size - *size_used); | |
1379 | *size_used = size; | |
1380 | *pages_used = num_elem; | |
1381 | ||
1382 | return rc; | |
1383 | } | |
1384 | ||
0b243d00 VG |
1385 | /* This function decrypts the input skb into either out_iov or in out_sg |
1386 | * or in skb buffers itself. The input parameter 'zc' indicates if | |
1387 | * zero-copy mode needs to be tried or not. With zero-copy mode, either | |
1388 | * out_iov or out_sg must be non-NULL. In case both out_iov and out_sg are | |
1389 | * NULL, then the decryption happens inside skb buffers itself, i.e. | |
1390 | * zero-copy gets disabled and 'zc' is updated. | |
1391 | */ | |
1392 | ||
1393 | static int decrypt_internal(struct sock *sk, struct sk_buff *skb, | |
1394 | struct iov_iter *out_iov, | |
1395 | struct scatterlist *out_sg, | |
692d7b5d | 1396 | int *chunk, bool *zc, bool async) |
0b243d00 VG |
1397 | { |
1398 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
1399 | struct tls_sw_context_rx *ctx = tls_sw_ctx_rx(tls_ctx); | |
4509de14 | 1400 | struct tls_prot_info *prot = &tls_ctx->prot_info; |
0b243d00 VG |
1401 | struct strp_msg *rxm = strp_msg(skb); |
1402 | int n_sgin, n_sgout, nsg, mem_size, aead_size, err, pages = 0; | |
1403 | struct aead_request *aead_req; | |
1404 | struct sk_buff *unused; | |
1405 | u8 *aad, *iv, *mem = NULL; | |
1406 | struct scatterlist *sgin = NULL; | |
1407 | struct scatterlist *sgout = NULL; | |
4509de14 VG |
1408 | const int data_len = rxm->full_len - prot->overhead_size + |
1409 | prot->tail_size; | |
f295b3ae | 1410 | int iv_offset = 0; |
0b243d00 VG |
1411 | |
1412 | if (*zc && (out_iov || out_sg)) { | |
1413 | if (out_iov) | |
1414 | n_sgout = iov_iter_npages(out_iov, INT_MAX) + 1; | |
1415 | else | |
1416 | n_sgout = sg_nents(out_sg); | |
4509de14 VG |
1417 | n_sgin = skb_nsg(skb, rxm->offset + prot->prepend_size, |
1418 | rxm->full_len - prot->prepend_size); | |
0b243d00 VG |
1419 | } else { |
1420 | n_sgout = 0; | |
1421 | *zc = false; | |
0927f71d | 1422 | n_sgin = skb_cow_data(skb, 0, &unused); |
0b243d00 VG |
1423 | } |
1424 | ||
0b243d00 VG |
1425 | if (n_sgin < 1) |
1426 | return -EBADMSG; | |
1427 | ||
1428 | /* Increment to accommodate AAD */ | |
1429 | n_sgin = n_sgin + 1; | |
1430 | ||
1431 | nsg = n_sgin + n_sgout; | |
1432 | ||
1433 | aead_size = sizeof(*aead_req) + crypto_aead_reqsize(ctx->aead_recv); | |
1434 | mem_size = aead_size + (nsg * sizeof(struct scatterlist)); | |
4509de14 | 1435 | mem_size = mem_size + prot->aad_size; |
0b243d00 VG |
1436 | mem_size = mem_size + crypto_aead_ivsize(ctx->aead_recv); |
1437 | ||
1438 | /* Allocate a single block of memory which contains | |
1439 | * aead_req || sgin[] || sgout[] || aad || iv. | |
1440 | * This order achieves correct alignment for aead_req, sgin, sgout. | |
1441 | */ | |
1442 | mem = kmalloc(mem_size, sk->sk_allocation); | |
1443 | if (!mem) | |
1444 | return -ENOMEM; | |
1445 | ||
1446 | /* Segment the allocated memory */ | |
1447 | aead_req = (struct aead_request *)mem; | |
1448 | sgin = (struct scatterlist *)(mem + aead_size); | |
1449 | sgout = sgin + n_sgin; | |
1450 | aad = (u8 *)(sgout + n_sgout); | |
4509de14 | 1451 | iv = aad + prot->aad_size; |
0b243d00 | 1452 | |
f295b3ae VG |
1453 | /* For CCM based ciphers, first byte of nonce+iv is always '2' */ |
1454 | if (prot->cipher_type == TLS_CIPHER_AES_CCM_128) { | |
1455 | iv[0] = 2; | |
1456 | iv_offset = 1; | |
1457 | } | |
1458 | ||
0b243d00 VG |
1459 | /* Prepare IV */ |
1460 | err = skb_copy_bits(skb, rxm->offset + TLS_HEADER_SIZE, | |
f295b3ae | 1461 | iv + iv_offset + prot->salt_size, |
4509de14 | 1462 | prot->iv_size); |
0b243d00 VG |
1463 | if (err < 0) { |
1464 | kfree(mem); | |
1465 | return err; | |
1466 | } | |
4509de14 | 1467 | if (prot->version == TLS_1_3_VERSION) |
f295b3ae VG |
1468 | memcpy(iv + iv_offset, tls_ctx->rx.iv, |
1469 | crypto_aead_ivsize(ctx->aead_recv)); | |
130b392c | 1470 | else |
f295b3ae | 1471 | memcpy(iv + iv_offset, tls_ctx->rx.iv, prot->salt_size); |
130b392c | 1472 | |
4509de14 | 1473 | xor_iv_with_seq(prot->version, iv, tls_ctx->rx.rec_seq); |
0b243d00 VG |
1474 | |
1475 | /* Prepare AAD */ | |
4509de14 VG |
1476 | tls_make_aad(aad, rxm->full_len - prot->overhead_size + |
1477 | prot->tail_size, | |
1478 | tls_ctx->rx.rec_seq, prot->rec_seq_size, | |
1479 | ctx->control, prot->version); | |
0b243d00 VG |
1480 | |
1481 | /* Prepare sgin */ | |
1482 | sg_init_table(sgin, n_sgin); | |
4509de14 | 1483 | sg_set_buf(&sgin[0], aad, prot->aad_size); |
0b243d00 | 1484 | err = skb_to_sgvec(skb, &sgin[1], |
4509de14 VG |
1485 | rxm->offset + prot->prepend_size, |
1486 | rxm->full_len - prot->prepend_size); | |
0b243d00 VG |
1487 | if (err < 0) { |
1488 | kfree(mem); | |
1489 | return err; | |
1490 | } | |
1491 | ||
1492 | if (n_sgout) { | |
1493 | if (out_iov) { | |
1494 | sg_init_table(sgout, n_sgout); | |
4509de14 | 1495 | sg_set_buf(&sgout[0], aad, prot->aad_size); |
0b243d00 VG |
1496 | |
1497 | *chunk = 0; | |
d829e9c4 DB |
1498 | err = tls_setup_from_iter(sk, out_iov, data_len, |
1499 | &pages, chunk, &sgout[1], | |
1500 | (n_sgout - 1)); | |
0b243d00 VG |
1501 | if (err < 0) |
1502 | goto fallback_to_reg_recv; | |
1503 | } else if (out_sg) { | |
1504 | memcpy(sgout, out_sg, n_sgout * sizeof(*sgout)); | |
1505 | } else { | |
1506 | goto fallback_to_reg_recv; | |
1507 | } | |
1508 | } else { | |
1509 | fallback_to_reg_recv: | |
1510 | sgout = sgin; | |
1511 | pages = 0; | |
692d7b5d | 1512 | *chunk = data_len; |
0b243d00 VG |
1513 | *zc = false; |
1514 | } | |
1515 | ||
1516 | /* Prepare and submit AEAD request */ | |
94524d8f | 1517 | err = tls_do_decryption(sk, skb, sgin, sgout, iv, |
692d7b5d | 1518 | data_len, aead_req, async); |
94524d8f VG |
1519 | if (err == -EINPROGRESS) |
1520 | return err; | |
0b243d00 VG |
1521 | |
1522 | /* Release the pages in case iov was mapped to pages */ | |
1523 | for (; pages > 0; pages--) | |
1524 | put_page(sg_page(&sgout[pages])); | |
1525 | ||
1526 | kfree(mem); | |
1527 | return err; | |
1528 | } | |
1529 | ||
dafb67f3 | 1530 | static int decrypt_skb_update(struct sock *sk, struct sk_buff *skb, |
692d7b5d VG |
1531 | struct iov_iter *dest, int *chunk, bool *zc, |
1532 | bool async) | |
dafb67f3 BP |
1533 | { |
1534 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
1535 | struct tls_sw_context_rx *ctx = tls_sw_ctx_rx(tls_ctx); | |
4509de14 | 1536 | struct tls_prot_info *prot = &tls_ctx->prot_info; |
dafb67f3 | 1537 | struct strp_msg *rxm = strp_msg(skb); |
b53f4976 | 1538 | int pad, err = 0; |
dafb67f3 | 1539 | |
4799ac81 | 1540 | if (!ctx->decrypted) { |
b9d8fec9 | 1541 | if (tls_ctx->rx_conf == TLS_HW) { |
4de30a8d | 1542 | err = tls_device_decrypted(sk, tls_ctx, skb, rxm); |
b9d8fec9 JK |
1543 | if (err < 0) |
1544 | return err; | |
1545 | } | |
be2fbc15 | 1546 | |
d069b780 BP |
1547 | /* Still not decrypted after tls_device */ |
1548 | if (!ctx->decrypted) { | |
1549 | err = decrypt_internal(sk, skb, dest, NULL, chunk, zc, | |
1550 | async); | |
1551 | if (err < 0) { | |
1552 | if (err == -EINPROGRESS) | |
fb0f886f JK |
1553 | tls_advance_record_sn(sk, prot, |
1554 | &tls_ctx->rx); | |
5c5d22a7 JK |
1555 | else if (err == -EBADMSG) |
1556 | TLS_INC_STATS(sock_net(sk), | |
1557 | LINUX_MIB_TLSDECRYPTERROR); | |
d069b780 BP |
1558 | return err; |
1559 | } | |
c43ac97b JK |
1560 | } else { |
1561 | *zc = false; | |
94524d8f | 1562 | } |
130b392c | 1563 | |
b53f4976 JK |
1564 | pad = padding_length(ctx, prot, skb); |
1565 | if (pad < 0) | |
1566 | return pad; | |
1567 | ||
1568 | rxm->full_len -= pad; | |
4509de14 VG |
1569 | rxm->offset += prot->prepend_size; |
1570 | rxm->full_len -= prot->overhead_size; | |
fb0f886f | 1571 | tls_advance_record_sn(sk, prot, &tls_ctx->rx); |
bc76e5bb | 1572 | ctx->decrypted = 1; |
fedf201e | 1573 | ctx->saved_data_ready(sk); |
4799ac81 BP |
1574 | } else { |
1575 | *zc = false; | |
1576 | } | |
dafb67f3 | 1577 | |
dafb67f3 BP |
1578 | return err; |
1579 | } | |
1580 | ||
1581 | int decrypt_skb(struct sock *sk, struct sk_buff *skb, | |
1582 | struct scatterlist *sgout) | |
c46234eb | 1583 | { |
0b243d00 VG |
1584 | bool zc = true; |
1585 | int chunk; | |
c46234eb | 1586 | |
692d7b5d | 1587 | return decrypt_internal(sk, skb, NULL, sgout, &chunk, &zc, false); |
c46234eb DW |
1588 | } |
1589 | ||
1590 | static bool tls_sw_advance_skb(struct sock *sk, struct sk_buff *skb, | |
1591 | unsigned int len) | |
1592 | { | |
1593 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
f66de3ee | 1594 | struct tls_sw_context_rx *ctx = tls_sw_ctx_rx(tls_ctx); |
c46234eb | 1595 | |
94524d8f VG |
1596 | if (skb) { |
1597 | struct strp_msg *rxm = strp_msg(skb); | |
c46234eb | 1598 | |
94524d8f VG |
1599 | if (len < rxm->full_len) { |
1600 | rxm->offset += len; | |
1601 | rxm->full_len -= len; | |
1602 | return false; | |
1603 | } | |
a88c26f6 | 1604 | consume_skb(skb); |
c46234eb DW |
1605 | } |
1606 | ||
1607 | /* Finished with message */ | |
1608 | ctx->recv_pkt = NULL; | |
7170e604 | 1609 | __strp_unpause(&ctx->strp); |
c46234eb DW |
1610 | |
1611 | return true; | |
1612 | } | |
1613 | ||
692d7b5d | 1614 | /* This function traverses the rx_list in tls receive context to copies the |
2b794c40 | 1615 | * decrypted records into the buffer provided by caller zero copy is not |
692d7b5d VG |
1616 | * true. Further, the records are removed from the rx_list if it is not a peek |
1617 | * case and the record has been consumed completely. | |
1618 | */ | |
1619 | static int process_rx_list(struct tls_sw_context_rx *ctx, | |
1620 | struct msghdr *msg, | |
2b794c40 VG |
1621 | u8 *control, |
1622 | bool *cmsg, | |
692d7b5d VG |
1623 | size_t skip, |
1624 | size_t len, | |
1625 | bool zc, | |
1626 | bool is_peek) | |
1627 | { | |
1628 | struct sk_buff *skb = skb_peek(&ctx->rx_list); | |
2b794c40 VG |
1629 | u8 ctrl = *control; |
1630 | u8 msgc = *cmsg; | |
1631 | struct tls_msg *tlm; | |
692d7b5d VG |
1632 | ssize_t copied = 0; |
1633 | ||
2b794c40 VG |
1634 | /* Set the record type in 'control' if caller didn't pass it */ |
1635 | if (!ctrl && skb) { | |
1636 | tlm = tls_msg(skb); | |
1637 | ctrl = tlm->control; | |
1638 | } | |
1639 | ||
692d7b5d VG |
1640 | while (skip && skb) { |
1641 | struct strp_msg *rxm = strp_msg(skb); | |
2b794c40 VG |
1642 | tlm = tls_msg(skb); |
1643 | ||
1644 | /* Cannot process a record of different type */ | |
1645 | if (ctrl != tlm->control) | |
1646 | return 0; | |
692d7b5d VG |
1647 | |
1648 | if (skip < rxm->full_len) | |
1649 | break; | |
1650 | ||
1651 | skip = skip - rxm->full_len; | |
1652 | skb = skb_peek_next(skb, &ctx->rx_list); | |
1653 | } | |
1654 | ||
1655 | while (len && skb) { | |
1656 | struct sk_buff *next_skb; | |
1657 | struct strp_msg *rxm = strp_msg(skb); | |
1658 | int chunk = min_t(unsigned int, rxm->full_len - skip, len); | |
1659 | ||
2b794c40 VG |
1660 | tlm = tls_msg(skb); |
1661 | ||
1662 | /* Cannot process a record of different type */ | |
1663 | if (ctrl != tlm->control) | |
1664 | return 0; | |
1665 | ||
1666 | /* Set record type if not already done. For a non-data record, | |
1667 | * do not proceed if record type could not be copied. | |
1668 | */ | |
1669 | if (!msgc) { | |
1670 | int cerr = put_cmsg(msg, SOL_TLS, TLS_GET_RECORD_TYPE, | |
1671 | sizeof(ctrl), &ctrl); | |
1672 | msgc = true; | |
1673 | if (ctrl != TLS_RECORD_TYPE_DATA) { | |
1674 | if (cerr || msg->msg_flags & MSG_CTRUNC) | |
1675 | return -EIO; | |
1676 | ||
1677 | *cmsg = msgc; | |
1678 | } | |
1679 | } | |
1680 | ||
692d7b5d VG |
1681 | if (!zc || (rxm->full_len - skip) > len) { |
1682 | int err = skb_copy_datagram_msg(skb, rxm->offset + skip, | |
1683 | msg, chunk); | |
1684 | if (err < 0) | |
1685 | return err; | |
1686 | } | |
1687 | ||
1688 | len = len - chunk; | |
1689 | copied = copied + chunk; | |
1690 | ||
1691 | /* Consume the data from record if it is non-peek case*/ | |
1692 | if (!is_peek) { | |
1693 | rxm->offset = rxm->offset + chunk; | |
1694 | rxm->full_len = rxm->full_len - chunk; | |
1695 | ||
1696 | /* Return if there is unconsumed data in the record */ | |
1697 | if (rxm->full_len - skip) | |
1698 | break; | |
1699 | } | |
1700 | ||
1701 | /* The remaining skip-bytes must lie in 1st record in rx_list. | |
1702 | * So from the 2nd record, 'skip' should be 0. | |
1703 | */ | |
1704 | skip = 0; | |
1705 | ||
1706 | if (msg) | |
1707 | msg->msg_flags |= MSG_EOR; | |
1708 | ||
1709 | next_skb = skb_peek_next(skb, &ctx->rx_list); | |
1710 | ||
1711 | if (!is_peek) { | |
1712 | skb_unlink(skb, &ctx->rx_list); | |
a88c26f6 | 1713 | consume_skb(skb); |
692d7b5d VG |
1714 | } |
1715 | ||
1716 | skb = next_skb; | |
1717 | } | |
1718 | ||
2b794c40 | 1719 | *control = ctrl; |
692d7b5d VG |
1720 | return copied; |
1721 | } | |
1722 | ||
c46234eb DW |
1723 | int tls_sw_recvmsg(struct sock *sk, |
1724 | struct msghdr *msg, | |
1725 | size_t len, | |
1726 | int nonblock, | |
1727 | int flags, | |
1728 | int *addr_len) | |
1729 | { | |
1730 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
f66de3ee | 1731 | struct tls_sw_context_rx *ctx = tls_sw_ctx_rx(tls_ctx); |
4509de14 | 1732 | struct tls_prot_info *prot = &tls_ctx->prot_info; |
d3b18ad3 | 1733 | struct sk_psock *psock; |
692d7b5d VG |
1734 | unsigned char control = 0; |
1735 | ssize_t decrypted = 0; | |
c46234eb | 1736 | struct strp_msg *rxm; |
2b794c40 | 1737 | struct tls_msg *tlm; |
c46234eb DW |
1738 | struct sk_buff *skb; |
1739 | ssize_t copied = 0; | |
1740 | bool cmsg = false; | |
06030dba | 1741 | int target, err = 0; |
c46234eb | 1742 | long timeo; |
00e23707 | 1743 | bool is_kvec = iov_iter_is_kvec(&msg->msg_iter); |
692d7b5d | 1744 | bool is_peek = flags & MSG_PEEK; |
e91de6af | 1745 | bool bpf_strp_enabled; |
94524d8f | 1746 | int num_async = 0; |
0cada332 | 1747 | int pending; |
c46234eb DW |
1748 | |
1749 | flags |= nonblock; | |
1750 | ||
1751 | if (unlikely(flags & MSG_ERRQUEUE)) | |
1752 | return sock_recv_errqueue(sk, msg, len, SOL_IP, IP_RECVERR); | |
1753 | ||
d3b18ad3 | 1754 | psock = sk_psock_get(sk); |
c46234eb | 1755 | lock_sock(sk); |
e91de6af | 1756 | bpf_strp_enabled = sk_psock_strp_enabled(psock); |
c46234eb | 1757 | |
692d7b5d | 1758 | /* Process pending decrypted records. It must be non-zero-copy */ |
2b794c40 VG |
1759 | err = process_rx_list(ctx, msg, &control, &cmsg, 0, len, false, |
1760 | is_peek); | |
692d7b5d VG |
1761 | if (err < 0) { |
1762 | tls_err_abort(sk, err); | |
1763 | goto end; | |
1764 | } else { | |
1765 | copied = err; | |
1766 | } | |
1767 | ||
46a16959 | 1768 | if (len <= copied) |
692d7b5d | 1769 | goto recv_end; |
46a16959 JK |
1770 | |
1771 | target = sock_rcvlowat(sk, flags & MSG_WAITALL, len); | |
1772 | len = len - copied; | |
1773 | timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT); | |
692d7b5d | 1774 | |
04b25a54 | 1775 | while (len && (decrypted + copied < target || ctx->recv_pkt)) { |
692d7b5d | 1776 | bool retain_skb = false; |
692d7b5d VG |
1777 | bool zc = false; |
1778 | int to_decrypt; | |
c46234eb | 1779 | int chunk = 0; |
7754bd63 EBE |
1780 | bool async_capable; |
1781 | bool async = false; | |
c46234eb | 1782 | |
d3b18ad3 JF |
1783 | skb = tls_wait_data(sk, psock, flags, timeo, &err); |
1784 | if (!skb) { | |
1785 | if (psock) { | |
02c558b2 JF |
1786 | int ret = __tcp_bpf_recvmsg(sk, psock, |
1787 | msg, len, flags); | |
d3b18ad3 JF |
1788 | |
1789 | if (ret > 0) { | |
692d7b5d | 1790 | decrypted += ret; |
d3b18ad3 JF |
1791 | len -= ret; |
1792 | continue; | |
1793 | } | |
1794 | } | |
c46234eb | 1795 | goto recv_end; |
2b794c40 VG |
1796 | } else { |
1797 | tlm = tls_msg(skb); | |
1798 | if (prot->version == TLS_1_3_VERSION) | |
1799 | tlm->control = 0; | |
1800 | else | |
1801 | tlm->control = ctx->control; | |
d3b18ad3 | 1802 | } |
c46234eb DW |
1803 | |
1804 | rxm = strp_msg(skb); | |
94524d8f | 1805 | |
4509de14 | 1806 | to_decrypt = rxm->full_len - prot->overhead_size; |
fedf201e DW |
1807 | |
1808 | if (to_decrypt <= len && !is_kvec && !is_peek && | |
130b392c | 1809 | ctx->control == TLS_RECORD_TYPE_DATA && |
e91de6af JF |
1810 | prot->version != TLS_1_3_VERSION && |
1811 | !bpf_strp_enabled) | |
fedf201e DW |
1812 | zc = true; |
1813 | ||
c0ab4732 | 1814 | /* Do not use async mode if record is non-data */ |
e91de6af | 1815 | if (ctx->control == TLS_RECORD_TYPE_DATA && !bpf_strp_enabled) |
7754bd63 | 1816 | async_capable = ctx->async_capable; |
c0ab4732 | 1817 | else |
7754bd63 | 1818 | async_capable = false; |
c0ab4732 | 1819 | |
fedf201e | 1820 | err = decrypt_skb_update(sk, skb, &msg->msg_iter, |
7754bd63 | 1821 | &chunk, &zc, async_capable); |
fedf201e DW |
1822 | if (err < 0 && err != -EINPROGRESS) { |
1823 | tls_err_abort(sk, EBADMSG); | |
1824 | goto recv_end; | |
1825 | } | |
1826 | ||
7754bd63 EBE |
1827 | if (err == -EINPROGRESS) { |
1828 | async = true; | |
fedf201e | 1829 | num_async++; |
7754bd63 | 1830 | } else if (prot->version == TLS_1_3_VERSION) { |
2b794c40 | 1831 | tlm->control = ctx->control; |
7754bd63 | 1832 | } |
2b794c40 VG |
1833 | |
1834 | /* If the type of records being processed is not known yet, | |
1835 | * set it to record type just dequeued. If it is already known, | |
1836 | * but does not match the record type just dequeued, go to end. | |
1837 | * We always get record type here since for tls1.2, record type | |
1838 | * is known just after record is dequeued from stream parser. | |
1839 | * For tls1.3, we disable async. | |
1840 | */ | |
1841 | ||
1842 | if (!control) | |
1843 | control = tlm->control; | |
1844 | else if (control != tlm->control) | |
1845 | goto recv_end; | |
fedf201e | 1846 | |
c46234eb DW |
1847 | if (!cmsg) { |
1848 | int cerr; | |
1849 | ||
1850 | cerr = put_cmsg(msg, SOL_TLS, TLS_GET_RECORD_TYPE, | |
2b794c40 | 1851 | sizeof(control), &control); |
c46234eb | 1852 | cmsg = true; |
2b794c40 | 1853 | if (control != TLS_RECORD_TYPE_DATA) { |
c46234eb DW |
1854 | if (cerr || msg->msg_flags & MSG_CTRUNC) { |
1855 | err = -EIO; | |
1856 | goto recv_end; | |
1857 | } | |
1858 | } | |
c46234eb DW |
1859 | } |
1860 | ||
c0ab4732 VG |
1861 | if (async) |
1862 | goto pick_next_record; | |
1863 | ||
fedf201e | 1864 | if (!zc) { |
e91de6af JF |
1865 | if (bpf_strp_enabled) { |
1866 | err = sk_psock_tls_strp_read(psock, skb); | |
1867 | if (err != __SK_PASS) { | |
1868 | rxm->offset = rxm->offset + rxm->full_len; | |
1869 | rxm->full_len = 0; | |
1870 | if (err == __SK_DROP) | |
1871 | consume_skb(skb); | |
1872 | ctx->recv_pkt = NULL; | |
1873 | __strp_unpause(&ctx->strp); | |
1874 | continue; | |
1875 | } | |
1876 | } | |
1877 | ||
fedf201e DW |
1878 | if (rxm->full_len > len) { |
1879 | retain_skb = true; | |
1880 | chunk = len; | |
1881 | } else { | |
1882 | chunk = rxm->full_len; | |
1883 | } | |
692d7b5d | 1884 | |
fedf201e DW |
1885 | err = skb_copy_datagram_msg(skb, rxm->offset, |
1886 | msg, chunk); | |
1887 | if (err < 0) | |
1888 | goto recv_end; | |
94524d8f | 1889 | |
fedf201e DW |
1890 | if (!is_peek) { |
1891 | rxm->offset = rxm->offset + chunk; | |
1892 | rxm->full_len = rxm->full_len - chunk; | |
692d7b5d | 1893 | } |
c46234eb DW |
1894 | } |
1895 | ||
94524d8f | 1896 | pick_next_record: |
692d7b5d VG |
1897 | if (chunk > len) |
1898 | chunk = len; | |
1899 | ||
1900 | decrypted += chunk; | |
c46234eb | 1901 | len -= chunk; |
692d7b5d VG |
1902 | |
1903 | /* For async or peek case, queue the current skb */ | |
1904 | if (async || is_peek || retain_skb) { | |
1905 | skb_queue_tail(&ctx->rx_list, skb); | |
1906 | skb = NULL; | |
1907 | } | |
1908 | ||
1909 | if (tls_sw_advance_skb(sk, skb, chunk)) { | |
1910 | /* Return full control message to | |
1911 | * userspace before trying to parse | |
1912 | * another message type | |
50c6b58a | 1913 | */ |
692d7b5d VG |
1914 | msg->msg_flags |= MSG_EOR; |
1915 | if (ctx->control != TLS_RECORD_TYPE_DATA) | |
1916 | goto recv_end; | |
1917 | } else { | |
50c6b58a | 1918 | break; |
c46234eb | 1919 | } |
04b25a54 | 1920 | } |
c46234eb DW |
1921 | |
1922 | recv_end: | |
94524d8f VG |
1923 | if (num_async) { |
1924 | /* Wait for all previously submitted records to be decrypted */ | |
0cada332 VKY |
1925 | spin_lock_bh(&ctx->decrypt_compl_lock); |
1926 | ctx->async_notify = true; | |
1927 | pending = atomic_read(&ctx->decrypt_pending); | |
1928 | spin_unlock_bh(&ctx->decrypt_compl_lock); | |
1929 | if (pending) { | |
94524d8f VG |
1930 | err = crypto_wait_req(-EINPROGRESS, &ctx->async_wait); |
1931 | if (err) { | |
1932 | /* one of async decrypt failed */ | |
1933 | tls_err_abort(sk, err); | |
1934 | copied = 0; | |
692d7b5d VG |
1935 | decrypted = 0; |
1936 | goto end; | |
94524d8f VG |
1937 | } |
1938 | } else { | |
1939 | reinit_completion(&ctx->async_wait.completion); | |
1940 | } | |
0cada332 VKY |
1941 | |
1942 | /* There can be no concurrent accesses, since we have no | |
1943 | * pending decrypt operations | |
1944 | */ | |
94524d8f | 1945 | WRITE_ONCE(ctx->async_notify, false); |
692d7b5d VG |
1946 | |
1947 | /* Drain records from the rx_list & copy if required */ | |
1948 | if (is_peek || is_kvec) | |
2b794c40 | 1949 | err = process_rx_list(ctx, msg, &control, &cmsg, copied, |
692d7b5d VG |
1950 | decrypted, false, is_peek); |
1951 | else | |
2b794c40 | 1952 | err = process_rx_list(ctx, msg, &control, &cmsg, 0, |
692d7b5d VG |
1953 | decrypted, true, is_peek); |
1954 | if (err < 0) { | |
1955 | tls_err_abort(sk, err); | |
1956 | copied = 0; | |
1957 | goto end; | |
1958 | } | |
94524d8f VG |
1959 | } |
1960 | ||
692d7b5d VG |
1961 | copied += decrypted; |
1962 | ||
1963 | end: | |
c46234eb | 1964 | release_sock(sk); |
d3b18ad3 JF |
1965 | if (psock) |
1966 | sk_psock_put(sk, psock); | |
c46234eb DW |
1967 | return copied ? : err; |
1968 | } | |
1969 | ||
1970 | ssize_t tls_sw_splice_read(struct socket *sock, loff_t *ppos, | |
1971 | struct pipe_inode_info *pipe, | |
1972 | size_t len, unsigned int flags) | |
1973 | { | |
1974 | struct tls_context *tls_ctx = tls_get_ctx(sock->sk); | |
f66de3ee | 1975 | struct tls_sw_context_rx *ctx = tls_sw_ctx_rx(tls_ctx); |
c46234eb DW |
1976 | struct strp_msg *rxm = NULL; |
1977 | struct sock *sk = sock->sk; | |
1978 | struct sk_buff *skb; | |
1979 | ssize_t copied = 0; | |
1980 | int err = 0; | |
1981 | long timeo; | |
1982 | int chunk; | |
0b243d00 | 1983 | bool zc = false; |
c46234eb DW |
1984 | |
1985 | lock_sock(sk); | |
1986 | ||
1987 | timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT); | |
1988 | ||
d3b18ad3 | 1989 | skb = tls_wait_data(sk, NULL, flags, timeo, &err); |
c46234eb DW |
1990 | if (!skb) |
1991 | goto splice_read_end; | |
1992 | ||
c46234eb | 1993 | if (!ctx->decrypted) { |
692d7b5d | 1994 | err = decrypt_skb_update(sk, skb, NULL, &chunk, &zc, false); |
c46234eb | 1995 | |
fedf201e DW |
1996 | /* splice does not support reading control messages */ |
1997 | if (ctx->control != TLS_RECORD_TYPE_DATA) { | |
4a5cdc60 | 1998 | err = -EINVAL; |
fedf201e DW |
1999 | goto splice_read_end; |
2000 | } | |
2001 | ||
c46234eb DW |
2002 | if (err < 0) { |
2003 | tls_err_abort(sk, EBADMSG); | |
2004 | goto splice_read_end; | |
2005 | } | |
bc76e5bb | 2006 | ctx->decrypted = 1; |
c46234eb DW |
2007 | } |
2008 | rxm = strp_msg(skb); | |
2009 | ||
2010 | chunk = min_t(unsigned int, rxm->full_len, len); | |
2011 | copied = skb_splice_bits(skb, sk, rxm->offset, pipe, chunk, flags); | |
2012 | if (copied < 0) | |
2013 | goto splice_read_end; | |
2014 | ||
2015 | if (likely(!(flags & MSG_PEEK))) | |
2016 | tls_sw_advance_skb(sk, skb, copied); | |
2017 | ||
2018 | splice_read_end: | |
2019 | release_sock(sk); | |
2020 | return copied ? : err; | |
2021 | } | |
2022 | ||
924ad65e | 2023 | bool tls_sw_stream_read(const struct sock *sk) |
c46234eb | 2024 | { |
c46234eb | 2025 | struct tls_context *tls_ctx = tls_get_ctx(sk); |
f66de3ee | 2026 | struct tls_sw_context_rx *ctx = tls_sw_ctx_rx(tls_ctx); |
d3b18ad3 JF |
2027 | bool ingress_empty = true; |
2028 | struct sk_psock *psock; | |
c46234eb | 2029 | |
d3b18ad3 JF |
2030 | rcu_read_lock(); |
2031 | psock = sk_psock(sk); | |
2032 | if (psock) | |
2033 | ingress_empty = list_empty(&psock->ingress_msg); | |
2034 | rcu_read_unlock(); | |
c46234eb | 2035 | |
13aecb17 JK |
2036 | return !ingress_empty || ctx->recv_pkt || |
2037 | !skb_queue_empty(&ctx->rx_list); | |
c46234eb DW |
2038 | } |
2039 | ||
2040 | static int tls_read_size(struct strparser *strp, struct sk_buff *skb) | |
2041 | { | |
2042 | struct tls_context *tls_ctx = tls_get_ctx(strp->sk); | |
f66de3ee | 2043 | struct tls_sw_context_rx *ctx = tls_sw_ctx_rx(tls_ctx); |
4509de14 | 2044 | struct tls_prot_info *prot = &tls_ctx->prot_info; |
3463e51d | 2045 | char header[TLS_HEADER_SIZE + MAX_IV_SIZE]; |
c46234eb DW |
2046 | struct strp_msg *rxm = strp_msg(skb); |
2047 | size_t cipher_overhead; | |
2048 | size_t data_len = 0; | |
2049 | int ret; | |
2050 | ||
2051 | /* Verify that we have a full TLS header, or wait for more data */ | |
4509de14 | 2052 | if (rxm->offset + prot->prepend_size > skb->len) |
c46234eb DW |
2053 | return 0; |
2054 | ||
3463e51d | 2055 | /* Sanity-check size of on-stack buffer. */ |
4509de14 | 2056 | if (WARN_ON(prot->prepend_size > sizeof(header))) { |
3463e51d KC |
2057 | ret = -EINVAL; |
2058 | goto read_failure; | |
2059 | } | |
2060 | ||
c46234eb | 2061 | /* Linearize header to local buffer */ |
4509de14 | 2062 | ret = skb_copy_bits(skb, rxm->offset, header, prot->prepend_size); |
c46234eb DW |
2063 | |
2064 | if (ret < 0) | |
2065 | goto read_failure; | |
2066 | ||
2067 | ctx->control = header[0]; | |
2068 | ||
2069 | data_len = ((header[4] & 0xFF) | (header[3] << 8)); | |
2070 | ||
4509de14 VG |
2071 | cipher_overhead = prot->tag_size; |
2072 | if (prot->version != TLS_1_3_VERSION) | |
2073 | cipher_overhead += prot->iv_size; | |
c46234eb | 2074 | |
130b392c | 2075 | if (data_len > TLS_MAX_PAYLOAD_SIZE + cipher_overhead + |
4509de14 | 2076 | prot->tail_size) { |
c46234eb DW |
2077 | ret = -EMSGSIZE; |
2078 | goto read_failure; | |
2079 | } | |
2080 | if (data_len < cipher_overhead) { | |
2081 | ret = -EBADMSG; | |
2082 | goto read_failure; | |
2083 | } | |
2084 | ||
130b392c DW |
2085 | /* Note that both TLS1.3 and TLS1.2 use TLS_1_2 version here */ |
2086 | if (header[1] != TLS_1_2_VERSION_MINOR || | |
2087 | header[2] != TLS_1_2_VERSION_MAJOR) { | |
c46234eb DW |
2088 | ret = -EINVAL; |
2089 | goto read_failure; | |
2090 | } | |
be2fbc15 | 2091 | |
f953d33b | 2092 | tls_device_rx_resync_new_rec(strp->sk, data_len + TLS_HEADER_SIZE, |
fe58a5a0 | 2093 | TCP_SKB_CB(skb)->seq + rxm->offset); |
c46234eb DW |
2094 | return data_len + TLS_HEADER_SIZE; |
2095 | ||
2096 | read_failure: | |
2097 | tls_err_abort(strp->sk, ret); | |
2098 | ||
2099 | return ret; | |
2100 | } | |
2101 | ||
2102 | static void tls_queue(struct strparser *strp, struct sk_buff *skb) | |
2103 | { | |
2104 | struct tls_context *tls_ctx = tls_get_ctx(strp->sk); | |
f66de3ee | 2105 | struct tls_sw_context_rx *ctx = tls_sw_ctx_rx(tls_ctx); |
c46234eb | 2106 | |
bc76e5bb | 2107 | ctx->decrypted = 0; |
c46234eb DW |
2108 | |
2109 | ctx->recv_pkt = skb; | |
2110 | strp_pause(strp); | |
2111 | ||
ad13acce | 2112 | ctx->saved_data_ready(strp->sk); |
c46234eb DW |
2113 | } |
2114 | ||
2115 | static void tls_data_ready(struct sock *sk) | |
2116 | { | |
2117 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
f66de3ee | 2118 | struct tls_sw_context_rx *ctx = tls_sw_ctx_rx(tls_ctx); |
d3b18ad3 | 2119 | struct sk_psock *psock; |
c46234eb DW |
2120 | |
2121 | strp_data_ready(&ctx->strp); | |
d3b18ad3 JF |
2122 | |
2123 | psock = sk_psock_get(sk); | |
62b4011f XY |
2124 | if (psock) { |
2125 | if (!list_empty(&psock->ingress_msg)) | |
2126 | ctx->saved_data_ready(sk); | |
d3b18ad3 JF |
2127 | sk_psock_put(sk, psock); |
2128 | } | |
c46234eb DW |
2129 | } |
2130 | ||
f87e62d4 JF |
2131 | void tls_sw_cancel_work_tx(struct tls_context *tls_ctx) |
2132 | { | |
2133 | struct tls_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx); | |
2134 | ||
2135 | set_bit(BIT_TX_CLOSING, &ctx->tx_bitmask); | |
2136 | set_bit(BIT_TX_SCHEDULED, &ctx->tx_bitmask); | |
2137 | cancel_delayed_work_sync(&ctx->tx_work.work); | |
2138 | } | |
2139 | ||
313ab004 | 2140 | void tls_sw_release_resources_tx(struct sock *sk) |
3c4d7559 DW |
2141 | { |
2142 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
f66de3ee | 2143 | struct tls_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx); |
a42055e8 VG |
2144 | struct tls_rec *rec, *tmp; |
2145 | ||
2146 | /* Wait for any pending async encryptions to complete */ | |
2147 | smp_store_mb(ctx->async_notify, true); | |
2148 | if (atomic_read(&ctx->encrypt_pending)) | |
2149 | crypto_wait_req(-EINPROGRESS, &ctx->async_wait); | |
2150 | ||
a42055e8 VG |
2151 | tls_tx_records(sk, -1); |
2152 | ||
9932a29a | 2153 | /* Free up un-sent records in tx_list. First, free |
a42055e8 VG |
2154 | * the partially sent record if any at head of tx_list. |
2155 | */ | |
c5daa6cc JK |
2156 | if (tls_ctx->partially_sent_record) { |
2157 | tls_free_partial_record(sk, tls_ctx); | |
9932a29a | 2158 | rec = list_first_entry(&ctx->tx_list, |
a42055e8 VG |
2159 | struct tls_rec, list); |
2160 | list_del(&rec->list); | |
d829e9c4 | 2161 | sk_msg_free(sk, &rec->msg_plaintext); |
a42055e8 VG |
2162 | kfree(rec); |
2163 | } | |
2164 | ||
9932a29a | 2165 | list_for_each_entry_safe(rec, tmp, &ctx->tx_list, list) { |
a42055e8 | 2166 | list_del(&rec->list); |
d829e9c4 DB |
2167 | sk_msg_free(sk, &rec->msg_encrypted); |
2168 | sk_msg_free(sk, &rec->msg_plaintext); | |
a42055e8 VG |
2169 | kfree(rec); |
2170 | } | |
3c4d7559 | 2171 | |
201876b3 | 2172 | crypto_free_aead(ctx->aead_send); |
c774973e | 2173 | tls_free_open_rec(sk); |
313ab004 JF |
2174 | } |
2175 | ||
2176 | void tls_sw_free_ctx_tx(struct tls_context *tls_ctx) | |
2177 | { | |
2178 | struct tls_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx); | |
f66de3ee BP |
2179 | |
2180 | kfree(ctx); | |
2181 | } | |
2182 | ||
39f56e1a | 2183 | void tls_sw_release_resources_rx(struct sock *sk) |
f66de3ee BP |
2184 | { |
2185 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
2186 | struct tls_sw_context_rx *ctx = tls_sw_ctx_rx(tls_ctx); | |
2187 | ||
12c76861 JK |
2188 | kfree(tls_ctx->rx.rec_seq); |
2189 | kfree(tls_ctx->rx.iv); | |
2190 | ||
c46234eb | 2191 | if (ctx->aead_recv) { |
201876b3 VG |
2192 | kfree_skb(ctx->recv_pkt); |
2193 | ctx->recv_pkt = NULL; | |
692d7b5d | 2194 | skb_queue_purge(&ctx->rx_list); |
c46234eb DW |
2195 | crypto_free_aead(ctx->aead_recv); |
2196 | strp_stop(&ctx->strp); | |
313ab004 JF |
2197 | /* If tls_sw_strparser_arm() was not called (cleanup paths) |
2198 | * we still want to strp_stop(), but sk->sk_data_ready was | |
2199 | * never swapped. | |
2200 | */ | |
2201 | if (ctx->saved_data_ready) { | |
2202 | write_lock_bh(&sk->sk_callback_lock); | |
2203 | sk->sk_data_ready = ctx->saved_data_ready; | |
2204 | write_unlock_bh(&sk->sk_callback_lock); | |
2205 | } | |
c46234eb | 2206 | } |
39f56e1a BP |
2207 | } |
2208 | ||
313ab004 | 2209 | void tls_sw_strparser_done(struct tls_context *tls_ctx) |
39f56e1a | 2210 | { |
39f56e1a BP |
2211 | struct tls_sw_context_rx *ctx = tls_sw_ctx_rx(tls_ctx); |
2212 | ||
313ab004 JF |
2213 | strp_done(&ctx->strp); |
2214 | } | |
2215 | ||
2216 | void tls_sw_free_ctx_rx(struct tls_context *tls_ctx) | |
2217 | { | |
2218 | struct tls_sw_context_rx *ctx = tls_sw_ctx_rx(tls_ctx); | |
3c4d7559 | 2219 | |
3c4d7559 DW |
2220 | kfree(ctx); |
2221 | } | |
2222 | ||
313ab004 JF |
2223 | void tls_sw_free_resources_rx(struct sock *sk) |
2224 | { | |
2225 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
2226 | ||
2227 | tls_sw_release_resources_rx(sk); | |
2228 | tls_sw_free_ctx_rx(tls_ctx); | |
2229 | } | |
2230 | ||
9932a29a | 2231 | /* The work handler to transmitt the encrypted records in tx_list */ |
a42055e8 VG |
2232 | static void tx_work_handler(struct work_struct *work) |
2233 | { | |
2234 | struct delayed_work *delayed_work = to_delayed_work(work); | |
2235 | struct tx_work *tx_work = container_of(delayed_work, | |
2236 | struct tx_work, work); | |
2237 | struct sock *sk = tx_work->sk; | |
2238 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
f87e62d4 | 2239 | struct tls_sw_context_tx *ctx; |
a42055e8 | 2240 | |
f87e62d4 | 2241 | if (unlikely(!tls_ctx)) |
a42055e8 VG |
2242 | return; |
2243 | ||
f87e62d4 JF |
2244 | ctx = tls_sw_ctx_tx(tls_ctx); |
2245 | if (test_bit(BIT_TX_CLOSING, &ctx->tx_bitmask)) | |
2246 | return; | |
2247 | ||
2248 | if (!test_and_clear_bit(BIT_TX_SCHEDULED, &ctx->tx_bitmask)) | |
2249 | return; | |
79ffe608 | 2250 | mutex_lock(&tls_ctx->tx_lock); |
a42055e8 VG |
2251 | lock_sock(sk); |
2252 | tls_tx_records(sk, -1); | |
2253 | release_sock(sk); | |
79ffe608 | 2254 | mutex_unlock(&tls_ctx->tx_lock); |
a42055e8 VG |
2255 | } |
2256 | ||
7463d3a2 BP |
2257 | void tls_sw_write_space(struct sock *sk, struct tls_context *ctx) |
2258 | { | |
2259 | struct tls_sw_context_tx *tx_ctx = tls_sw_ctx_tx(ctx); | |
2260 | ||
2261 | /* Schedule the transmission if tx list is ready */ | |
02b1fa07 JK |
2262 | if (is_tx_ready(tx_ctx) && |
2263 | !test_and_set_bit(BIT_TX_SCHEDULED, &tx_ctx->tx_bitmask)) | |
2264 | schedule_delayed_work(&tx_ctx->tx_work.work, 0); | |
7463d3a2 BP |
2265 | } |
2266 | ||
318892ac JK |
2267 | void tls_sw_strparser_arm(struct sock *sk, struct tls_context *tls_ctx) |
2268 | { | |
2269 | struct tls_sw_context_rx *rx_ctx = tls_sw_ctx_rx(tls_ctx); | |
2270 | ||
2271 | write_lock_bh(&sk->sk_callback_lock); | |
2272 | rx_ctx->saved_data_ready = sk->sk_data_ready; | |
2273 | sk->sk_data_ready = tls_data_ready; | |
2274 | write_unlock_bh(&sk->sk_callback_lock); | |
2275 | ||
2276 | strp_check_rcv(&rx_ctx->strp); | |
2277 | } | |
2278 | ||
c46234eb | 2279 | int tls_set_sw_offload(struct sock *sk, struct tls_context *ctx, int tx) |
3c4d7559 | 2280 | { |
4509de14 VG |
2281 | struct tls_context *tls_ctx = tls_get_ctx(sk); |
2282 | struct tls_prot_info *prot = &tls_ctx->prot_info; | |
3c4d7559 DW |
2283 | struct tls_crypto_info *crypto_info; |
2284 | struct tls12_crypto_info_aes_gcm_128 *gcm_128_info; | |
fb99bce7 | 2285 | struct tls12_crypto_info_aes_gcm_256 *gcm_256_info; |
f295b3ae | 2286 | struct tls12_crypto_info_aes_ccm_128 *ccm_128_info; |
f66de3ee BP |
2287 | struct tls_sw_context_tx *sw_ctx_tx = NULL; |
2288 | struct tls_sw_context_rx *sw_ctx_rx = NULL; | |
c46234eb DW |
2289 | struct cipher_context *cctx; |
2290 | struct crypto_aead **aead; | |
2291 | struct strp_callbacks cb; | |
f295b3ae | 2292 | u16 nonce_size, tag_size, iv_size, rec_seq_size, salt_size; |
692d7b5d | 2293 | struct crypto_tfm *tfm; |
f295b3ae | 2294 | char *iv, *rec_seq, *key, *salt, *cipher_name; |
fb99bce7 | 2295 | size_t keysize; |
3c4d7559 DW |
2296 | int rc = 0; |
2297 | ||
2298 | if (!ctx) { | |
2299 | rc = -EINVAL; | |
2300 | goto out; | |
2301 | } | |
2302 | ||
f66de3ee | 2303 | if (tx) { |
b190a587 BP |
2304 | if (!ctx->priv_ctx_tx) { |
2305 | sw_ctx_tx = kzalloc(sizeof(*sw_ctx_tx), GFP_KERNEL); | |
2306 | if (!sw_ctx_tx) { | |
2307 | rc = -ENOMEM; | |
2308 | goto out; | |
2309 | } | |
2310 | ctx->priv_ctx_tx = sw_ctx_tx; | |
2311 | } else { | |
2312 | sw_ctx_tx = | |
2313 | (struct tls_sw_context_tx *)ctx->priv_ctx_tx; | |
c46234eb | 2314 | } |
c46234eb | 2315 | } else { |
b190a587 BP |
2316 | if (!ctx->priv_ctx_rx) { |
2317 | sw_ctx_rx = kzalloc(sizeof(*sw_ctx_rx), GFP_KERNEL); | |
2318 | if (!sw_ctx_rx) { | |
2319 | rc = -ENOMEM; | |
2320 | goto out; | |
2321 | } | |
2322 | ctx->priv_ctx_rx = sw_ctx_rx; | |
2323 | } else { | |
2324 | sw_ctx_rx = | |
2325 | (struct tls_sw_context_rx *)ctx->priv_ctx_rx; | |
f66de3ee | 2326 | } |
3c4d7559 DW |
2327 | } |
2328 | ||
c46234eb | 2329 | if (tx) { |
b190a587 | 2330 | crypto_init_wait(&sw_ctx_tx->async_wait); |
0cada332 | 2331 | spin_lock_init(&sw_ctx_tx->encrypt_compl_lock); |
86029d10 | 2332 | crypto_info = &ctx->crypto_send.info; |
c46234eb | 2333 | cctx = &ctx->tx; |
f66de3ee | 2334 | aead = &sw_ctx_tx->aead_send; |
9932a29a | 2335 | INIT_LIST_HEAD(&sw_ctx_tx->tx_list); |
a42055e8 VG |
2336 | INIT_DELAYED_WORK(&sw_ctx_tx->tx_work.work, tx_work_handler); |
2337 | sw_ctx_tx->tx_work.sk = sk; | |
c46234eb | 2338 | } else { |
b190a587 | 2339 | crypto_init_wait(&sw_ctx_rx->async_wait); |
0cada332 | 2340 | spin_lock_init(&sw_ctx_rx->decrypt_compl_lock); |
86029d10 | 2341 | crypto_info = &ctx->crypto_recv.info; |
c46234eb | 2342 | cctx = &ctx->rx; |
692d7b5d | 2343 | skb_queue_head_init(&sw_ctx_rx->rx_list); |
f66de3ee | 2344 | aead = &sw_ctx_rx->aead_recv; |
c46234eb DW |
2345 | } |
2346 | ||
3c4d7559 DW |
2347 | switch (crypto_info->cipher_type) { |
2348 | case TLS_CIPHER_AES_GCM_128: { | |
2349 | nonce_size = TLS_CIPHER_AES_GCM_128_IV_SIZE; | |
2350 | tag_size = TLS_CIPHER_AES_GCM_128_TAG_SIZE; | |
2351 | iv_size = TLS_CIPHER_AES_GCM_128_IV_SIZE; | |
2352 | iv = ((struct tls12_crypto_info_aes_gcm_128 *)crypto_info)->iv; | |
2353 | rec_seq_size = TLS_CIPHER_AES_GCM_128_REC_SEQ_SIZE; | |
2354 | rec_seq = | |
2355 | ((struct tls12_crypto_info_aes_gcm_128 *)crypto_info)->rec_seq; | |
2356 | gcm_128_info = | |
2357 | (struct tls12_crypto_info_aes_gcm_128 *)crypto_info; | |
fb99bce7 DW |
2358 | keysize = TLS_CIPHER_AES_GCM_128_KEY_SIZE; |
2359 | key = gcm_128_info->key; | |
2360 | salt = gcm_128_info->salt; | |
f295b3ae VG |
2361 | salt_size = TLS_CIPHER_AES_GCM_128_SALT_SIZE; |
2362 | cipher_name = "gcm(aes)"; | |
fb99bce7 DW |
2363 | break; |
2364 | } | |
2365 | case TLS_CIPHER_AES_GCM_256: { | |
2366 | nonce_size = TLS_CIPHER_AES_GCM_256_IV_SIZE; | |
2367 | tag_size = TLS_CIPHER_AES_GCM_256_TAG_SIZE; | |
2368 | iv_size = TLS_CIPHER_AES_GCM_256_IV_SIZE; | |
2369 | iv = ((struct tls12_crypto_info_aes_gcm_256 *)crypto_info)->iv; | |
2370 | rec_seq_size = TLS_CIPHER_AES_GCM_256_REC_SEQ_SIZE; | |
2371 | rec_seq = | |
2372 | ((struct tls12_crypto_info_aes_gcm_256 *)crypto_info)->rec_seq; | |
2373 | gcm_256_info = | |
2374 | (struct tls12_crypto_info_aes_gcm_256 *)crypto_info; | |
2375 | keysize = TLS_CIPHER_AES_GCM_256_KEY_SIZE; | |
2376 | key = gcm_256_info->key; | |
2377 | salt = gcm_256_info->salt; | |
f295b3ae VG |
2378 | salt_size = TLS_CIPHER_AES_GCM_256_SALT_SIZE; |
2379 | cipher_name = "gcm(aes)"; | |
2380 | break; | |
2381 | } | |
2382 | case TLS_CIPHER_AES_CCM_128: { | |
2383 | nonce_size = TLS_CIPHER_AES_CCM_128_IV_SIZE; | |
2384 | tag_size = TLS_CIPHER_AES_CCM_128_TAG_SIZE; | |
2385 | iv_size = TLS_CIPHER_AES_CCM_128_IV_SIZE; | |
2386 | iv = ((struct tls12_crypto_info_aes_ccm_128 *)crypto_info)->iv; | |
2387 | rec_seq_size = TLS_CIPHER_AES_CCM_128_REC_SEQ_SIZE; | |
2388 | rec_seq = | |
2389 | ((struct tls12_crypto_info_aes_ccm_128 *)crypto_info)->rec_seq; | |
2390 | ccm_128_info = | |
2391 | (struct tls12_crypto_info_aes_ccm_128 *)crypto_info; | |
2392 | keysize = TLS_CIPHER_AES_CCM_128_KEY_SIZE; | |
2393 | key = ccm_128_info->key; | |
2394 | salt = ccm_128_info->salt; | |
2395 | salt_size = TLS_CIPHER_AES_CCM_128_SALT_SIZE; | |
2396 | cipher_name = "ccm(aes)"; | |
3c4d7559 DW |
2397 | break; |
2398 | } | |
2399 | default: | |
2400 | rc = -EINVAL; | |
cf6d43ef | 2401 | goto free_priv; |
3c4d7559 DW |
2402 | } |
2403 | ||
89fec474 JK |
2404 | /* Sanity-check the sizes for stack allocations. */ |
2405 | if (iv_size > MAX_IV_SIZE || nonce_size > MAX_IV_SIZE || | |
2406 | rec_seq_size > TLS_MAX_REC_SEQ_SIZE) { | |
b16520f7 KC |
2407 | rc = -EINVAL; |
2408 | goto free_priv; | |
2409 | } | |
2410 | ||
130b392c DW |
2411 | if (crypto_info->version == TLS_1_3_VERSION) { |
2412 | nonce_size = 0; | |
4509de14 VG |
2413 | prot->aad_size = TLS_HEADER_SIZE; |
2414 | prot->tail_size = 1; | |
130b392c | 2415 | } else { |
4509de14 VG |
2416 | prot->aad_size = TLS_AAD_SPACE_SIZE; |
2417 | prot->tail_size = 0; | |
130b392c DW |
2418 | } |
2419 | ||
4509de14 VG |
2420 | prot->version = crypto_info->version; |
2421 | prot->cipher_type = crypto_info->cipher_type; | |
2422 | prot->prepend_size = TLS_HEADER_SIZE + nonce_size; | |
2423 | prot->tag_size = tag_size; | |
2424 | prot->overhead_size = prot->prepend_size + | |
2425 | prot->tag_size + prot->tail_size; | |
2426 | prot->iv_size = iv_size; | |
f295b3ae VG |
2427 | prot->salt_size = salt_size; |
2428 | cctx->iv = kmalloc(iv_size + salt_size, GFP_KERNEL); | |
c46234eb | 2429 | if (!cctx->iv) { |
3c4d7559 | 2430 | rc = -ENOMEM; |
cf6d43ef | 2431 | goto free_priv; |
3c4d7559 | 2432 | } |
fb99bce7 | 2433 | /* Note: 128 & 256 bit salt are the same size */ |
4509de14 | 2434 | prot->rec_seq_size = rec_seq_size; |
f295b3ae VG |
2435 | memcpy(cctx->iv, salt, salt_size); |
2436 | memcpy(cctx->iv + salt_size, iv, iv_size); | |
969d5090 | 2437 | cctx->rec_seq = kmemdup(rec_seq, rec_seq_size, GFP_KERNEL); |
c46234eb | 2438 | if (!cctx->rec_seq) { |
3c4d7559 DW |
2439 | rc = -ENOMEM; |
2440 | goto free_iv; | |
2441 | } | |
c46234eb | 2442 | |
c46234eb | 2443 | if (!*aead) { |
f295b3ae | 2444 | *aead = crypto_alloc_aead(cipher_name, 0, 0); |
c46234eb DW |
2445 | if (IS_ERR(*aead)) { |
2446 | rc = PTR_ERR(*aead); | |
2447 | *aead = NULL; | |
3c4d7559 DW |
2448 | goto free_rec_seq; |
2449 | } | |
2450 | } | |
2451 | ||
2452 | ctx->push_pending_record = tls_sw_push_pending_record; | |
2453 | ||
fb99bce7 DW |
2454 | rc = crypto_aead_setkey(*aead, key, keysize); |
2455 | ||
3c4d7559 DW |
2456 | if (rc) |
2457 | goto free_aead; | |
2458 | ||
4509de14 | 2459 | rc = crypto_aead_setauthsize(*aead, prot->tag_size); |
c46234eb DW |
2460 | if (rc) |
2461 | goto free_aead; | |
2462 | ||
f66de3ee | 2463 | if (sw_ctx_rx) { |
692d7b5d | 2464 | tfm = crypto_aead_tfm(sw_ctx_rx->aead_recv); |
8497ded2 VG |
2465 | |
2466 | if (crypto_info->version == TLS_1_3_VERSION) | |
5c5458ec | 2467 | sw_ctx_rx->async_capable = 0; |
8497ded2 VG |
2468 | else |
2469 | sw_ctx_rx->async_capable = | |
5c5458ec JK |
2470 | !!(tfm->__crt_alg->cra_flags & |
2471 | CRYPTO_ALG_ASYNC); | |
692d7b5d | 2472 | |
c46234eb DW |
2473 | /* Set up strparser */ |
2474 | memset(&cb, 0, sizeof(cb)); | |
2475 | cb.rcv_msg = tls_queue; | |
2476 | cb.parse_msg = tls_read_size; | |
2477 | ||
f66de3ee | 2478 | strp_init(&sw_ctx_rx->strp, sk, &cb); |
c46234eb DW |
2479 | } |
2480 | ||
2481 | goto out; | |
3c4d7559 DW |
2482 | |
2483 | free_aead: | |
c46234eb DW |
2484 | crypto_free_aead(*aead); |
2485 | *aead = NULL; | |
3c4d7559 | 2486 | free_rec_seq: |
c46234eb DW |
2487 | kfree(cctx->rec_seq); |
2488 | cctx->rec_seq = NULL; | |
3c4d7559 | 2489 | free_iv: |
f66de3ee BP |
2490 | kfree(cctx->iv); |
2491 | cctx->iv = NULL; | |
cf6d43ef | 2492 | free_priv: |
f66de3ee BP |
2493 | if (tx) { |
2494 | kfree(ctx->priv_ctx_tx); | |
2495 | ctx->priv_ctx_tx = NULL; | |
2496 | } else { | |
2497 | kfree(ctx->priv_ctx_rx); | |
2498 | ctx->priv_ctx_rx = NULL; | |
2499 | } | |
3c4d7559 DW |
2500 | out: |
2501 | return rc; | |
2502 | } |