Commit | Line | Data |
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3c4d7559 DW |
1 | /* |
2 | * Copyright (c) 2016-2017, Mellanox Technologies. All rights reserved. | |
3 | * Copyright (c) 2016-2017, Dave Watson <davejwatson@fb.com>. All rights reserved. | |
4 | * Copyright (c) 2016-2017, Lance Chao <lancerchao@fb.com>. All rights reserved. | |
5 | * Copyright (c) 2016, Fridolin Pokorny <fridolin.pokorny@gmail.com>. All rights reserved. | |
6 | * Copyright (c) 2016, Nikos Mavrogiannopoulos <nmav@gnutls.org>. All rights reserved. | |
d3b18ad3 | 7 | * Copyright (c) 2018, Covalent IO, Inc. http://covalent.io |
3c4d7559 DW |
8 | * |
9 | * This software is available to you under a choice of one of two | |
10 | * licenses. You may choose to be licensed under the terms of the GNU | |
11 | * General Public License (GPL) Version 2, available from the file | |
12 | * COPYING in the main directory of this source tree, or the | |
13 | * OpenIB.org BSD license below: | |
14 | * | |
15 | * Redistribution and use in source and binary forms, with or | |
16 | * without modification, are permitted provided that the following | |
17 | * conditions are met: | |
18 | * | |
19 | * - Redistributions of source code must retain the above | |
20 | * copyright notice, this list of conditions and the following | |
21 | * disclaimer. | |
22 | * | |
23 | * - Redistributions in binary form must reproduce the above | |
24 | * copyright notice, this list of conditions and the following | |
25 | * disclaimer in the documentation and/or other materials | |
26 | * provided with the distribution. | |
27 | * | |
28 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, | |
29 | * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF | |
30 | * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND | |
31 | * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS | |
32 | * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN | |
33 | * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN | |
34 | * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE | |
35 | * SOFTWARE. | |
36 | */ | |
37 | ||
da353fac | 38 | #include <linux/bug.h> |
c46234eb | 39 | #include <linux/sched/signal.h> |
3c4d7559 | 40 | #include <linux/module.h> |
974271e5 | 41 | #include <linux/splice.h> |
3c4d7559 DW |
42 | #include <crypto/aead.h> |
43 | ||
c46234eb | 44 | #include <net/strparser.h> |
3c4d7559 DW |
45 | #include <net/tls.h> |
46 | ||
58790314 JK |
47 | #include "tls.h" |
48 | ||
4175eac3 | 49 | struct tls_decrypt_arg { |
6bd116c8 | 50 | struct_group(inargs, |
4175eac3 JK |
51 | bool zc; |
52 | bool async; | |
ce61327c | 53 | u8 tail; |
6bd116c8 JK |
54 | ); |
55 | ||
56 | struct sk_buff *skb; | |
4175eac3 JK |
57 | }; |
58 | ||
b89fec54 JK |
59 | struct tls_decrypt_ctx { |
60 | u8 iv[MAX_IV_SIZE]; | |
61 | u8 aad[TLS_MAX_AAD_SIZE]; | |
62 | u8 tail; | |
63 | struct scatterlist sg[]; | |
64 | }; | |
65 | ||
da353fac DJ |
66 | noinline void tls_err_abort(struct sock *sk, int err) |
67 | { | |
68 | WARN_ON_ONCE(err >= 0); | |
69 | /* sk->sk_err should contain a positive error code. */ | |
70 | sk->sk_err = -err; | |
71 | sk_error_report(sk); | |
72 | } | |
73 | ||
0927f71d DRK |
74 | static int __skb_nsg(struct sk_buff *skb, int offset, int len, |
75 | unsigned int recursion_level) | |
76 | { | |
77 | int start = skb_headlen(skb); | |
78 | int i, chunk = start - offset; | |
79 | struct sk_buff *frag_iter; | |
80 | int elt = 0; | |
81 | ||
82 | if (unlikely(recursion_level >= 24)) | |
83 | return -EMSGSIZE; | |
84 | ||
85 | if (chunk > 0) { | |
86 | if (chunk > len) | |
87 | chunk = len; | |
88 | elt++; | |
89 | len -= chunk; | |
90 | if (len == 0) | |
91 | return elt; | |
92 | offset += chunk; | |
93 | } | |
94 | ||
95 | for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) { | |
96 | int end; | |
97 | ||
98 | WARN_ON(start > offset + len); | |
99 | ||
100 | end = start + skb_frag_size(&skb_shinfo(skb)->frags[i]); | |
101 | chunk = end - offset; | |
102 | if (chunk > 0) { | |
103 | if (chunk > len) | |
104 | chunk = len; | |
105 | elt++; | |
106 | len -= chunk; | |
107 | if (len == 0) | |
108 | return elt; | |
109 | offset += chunk; | |
110 | } | |
111 | start = end; | |
112 | } | |
113 | ||
114 | if (unlikely(skb_has_frag_list(skb))) { | |
115 | skb_walk_frags(skb, frag_iter) { | |
116 | int end, ret; | |
117 | ||
118 | WARN_ON(start > offset + len); | |
119 | ||
120 | end = start + frag_iter->len; | |
121 | chunk = end - offset; | |
122 | if (chunk > 0) { | |
123 | if (chunk > len) | |
124 | chunk = len; | |
125 | ret = __skb_nsg(frag_iter, offset - start, chunk, | |
126 | recursion_level + 1); | |
127 | if (unlikely(ret < 0)) | |
128 | return ret; | |
129 | elt += ret; | |
130 | len -= chunk; | |
131 | if (len == 0) | |
132 | return elt; | |
133 | offset += chunk; | |
134 | } | |
135 | start = end; | |
136 | } | |
137 | } | |
138 | BUG_ON(len); | |
139 | return elt; | |
140 | } | |
141 | ||
142 | /* Return the number of scatterlist elements required to completely map the | |
143 | * skb, or -EMSGSIZE if the recursion depth is exceeded. | |
144 | */ | |
145 | static int skb_nsg(struct sk_buff *skb, int offset, int len) | |
146 | { | |
147 | return __skb_nsg(skb, offset, len, 0); | |
148 | } | |
149 | ||
ce61327c JK |
150 | static int tls_padding_length(struct tls_prot_info *prot, struct sk_buff *skb, |
151 | struct tls_decrypt_arg *darg) | |
130b392c DW |
152 | { |
153 | struct strp_msg *rxm = strp_msg(skb); | |
c3f6bb74 | 154 | struct tls_msg *tlm = tls_msg(skb); |
130b392c DW |
155 | int sub = 0; |
156 | ||
157 | /* Determine zero-padding length */ | |
b53f4976 | 158 | if (prot->version == TLS_1_3_VERSION) { |
5deee41b | 159 | int offset = rxm->full_len - TLS_TAG_SIZE - 1; |
ce61327c | 160 | char content_type = darg->zc ? darg->tail : 0; |
130b392c | 161 | int err; |
130b392c DW |
162 | |
163 | while (content_type == 0) { | |
5deee41b | 164 | if (offset < prot->prepend_size) |
130b392c | 165 | return -EBADMSG; |
5deee41b | 166 | err = skb_copy_bits(skb, rxm->offset + offset, |
130b392c | 167 | &content_type, 1); |
b53f4976 JK |
168 | if (err) |
169 | return err; | |
130b392c DW |
170 | if (content_type) |
171 | break; | |
172 | sub++; | |
5deee41b | 173 | offset--; |
130b392c | 174 | } |
c3f6bb74 | 175 | tlm->control = content_type; |
130b392c DW |
176 | } |
177 | return sub; | |
178 | } | |
179 | ||
94524d8f VG |
180 | static void tls_decrypt_done(struct crypto_async_request *req, int err) |
181 | { | |
182 | struct aead_request *aead_req = (struct aead_request *)req; | |
94524d8f | 183 | struct scatterlist *sgout = aead_req->dst; |
692d7b5d | 184 | struct scatterlist *sgin = aead_req->src; |
7a3dd8c8 JF |
185 | struct tls_sw_context_rx *ctx; |
186 | struct tls_context *tls_ctx; | |
94524d8f VG |
187 | struct scatterlist *sg; |
188 | unsigned int pages; | |
6ececdc5 | 189 | struct sock *sk; |
7a3dd8c8 | 190 | |
6ececdc5 JK |
191 | sk = (struct sock *)req->data; |
192 | tls_ctx = tls_get_ctx(sk); | |
7a3dd8c8 | 193 | ctx = tls_sw_ctx_rx(tls_ctx); |
94524d8f VG |
194 | |
195 | /* Propagate if there was an err */ | |
196 | if (err) { | |
5c5ec668 | 197 | if (err == -EBADMSG) |
6ececdc5 | 198 | TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSDECRYPTERROR); |
94524d8f | 199 | ctx->async_wait.err = err; |
6ececdc5 | 200 | tls_err_abort(sk, err); |
94524d8f VG |
201 | } |
202 | ||
692d7b5d VG |
203 | /* Free the destination pages if skb was not decrypted inplace */ |
204 | if (sgout != sgin) { | |
205 | /* Skip the first S/G entry as it points to AAD */ | |
206 | for_each_sg(sg_next(sgout), sg, UINT_MAX, pages) { | |
207 | if (!sg) | |
208 | break; | |
209 | put_page(sg_page(sg)); | |
210 | } | |
94524d8f VG |
211 | } |
212 | ||
213 | kfree(aead_req); | |
214 | ||
0cada332 | 215 | spin_lock_bh(&ctx->decrypt_compl_lock); |
37943f04 | 216 | if (!atomic_dec_return(&ctx->decrypt_pending)) |
94524d8f | 217 | complete(&ctx->async_wait.completion); |
0cada332 | 218 | spin_unlock_bh(&ctx->decrypt_compl_lock); |
94524d8f VG |
219 | } |
220 | ||
c46234eb DW |
221 | static int tls_do_decryption(struct sock *sk, |
222 | struct scatterlist *sgin, | |
223 | struct scatterlist *sgout, | |
224 | char *iv_recv, | |
225 | size_t data_len, | |
94524d8f | 226 | struct aead_request *aead_req, |
3547a1f9 | 227 | struct tls_decrypt_arg *darg) |
c46234eb DW |
228 | { |
229 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
4509de14 | 230 | struct tls_prot_info *prot = &tls_ctx->prot_info; |
f66de3ee | 231 | struct tls_sw_context_rx *ctx = tls_sw_ctx_rx(tls_ctx); |
c46234eb | 232 | int ret; |
c46234eb | 233 | |
0b243d00 | 234 | aead_request_set_tfm(aead_req, ctx->aead_recv); |
4509de14 | 235 | aead_request_set_ad(aead_req, prot->aad_size); |
c46234eb | 236 | aead_request_set_crypt(aead_req, sgin, sgout, |
4509de14 | 237 | data_len + prot->tag_size, |
c46234eb | 238 | (u8 *)iv_recv); |
c46234eb | 239 | |
3547a1f9 | 240 | if (darg->async) { |
94524d8f VG |
241 | aead_request_set_callback(aead_req, |
242 | CRYPTO_TFM_REQ_MAY_BACKLOG, | |
6ececdc5 | 243 | tls_decrypt_done, sk); |
94524d8f VG |
244 | atomic_inc(&ctx->decrypt_pending); |
245 | } else { | |
246 | aead_request_set_callback(aead_req, | |
247 | CRYPTO_TFM_REQ_MAY_BACKLOG, | |
248 | crypto_req_done, &ctx->async_wait); | |
249 | } | |
250 | ||
251 | ret = crypto_aead_decrypt(aead_req); | |
252 | if (ret == -EINPROGRESS) { | |
3547a1f9 JK |
253 | if (darg->async) |
254 | return 0; | |
94524d8f VG |
255 | |
256 | ret = crypto_wait_req(ret, &ctx->async_wait); | |
257 | } | |
3547a1f9 JK |
258 | darg->async = false; |
259 | ||
c46234eb DW |
260 | return ret; |
261 | } | |
262 | ||
d829e9c4 | 263 | static void tls_trim_both_msgs(struct sock *sk, int target_size) |
3c4d7559 DW |
264 | { |
265 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
4509de14 | 266 | struct tls_prot_info *prot = &tls_ctx->prot_info; |
f66de3ee | 267 | struct tls_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx); |
a42055e8 | 268 | struct tls_rec *rec = ctx->open_rec; |
3c4d7559 | 269 | |
d829e9c4 | 270 | sk_msg_trim(sk, &rec->msg_plaintext, target_size); |
3c4d7559 | 271 | if (target_size > 0) |
4509de14 | 272 | target_size += prot->overhead_size; |
d829e9c4 | 273 | sk_msg_trim(sk, &rec->msg_encrypted, target_size); |
3c4d7559 DW |
274 | } |
275 | ||
d829e9c4 | 276 | static int tls_alloc_encrypted_msg(struct sock *sk, int len) |
3c4d7559 DW |
277 | { |
278 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
f66de3ee | 279 | struct tls_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx); |
a42055e8 | 280 | struct tls_rec *rec = ctx->open_rec; |
d829e9c4 | 281 | struct sk_msg *msg_en = &rec->msg_encrypted; |
3c4d7559 | 282 | |
d829e9c4 | 283 | return sk_msg_alloc(sk, msg_en, len, 0); |
3c4d7559 DW |
284 | } |
285 | ||
d829e9c4 | 286 | static int tls_clone_plaintext_msg(struct sock *sk, int required) |
3c4d7559 DW |
287 | { |
288 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
4509de14 | 289 | struct tls_prot_info *prot = &tls_ctx->prot_info; |
f66de3ee | 290 | struct tls_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx); |
a42055e8 | 291 | struct tls_rec *rec = ctx->open_rec; |
d829e9c4 DB |
292 | struct sk_msg *msg_pl = &rec->msg_plaintext; |
293 | struct sk_msg *msg_en = &rec->msg_encrypted; | |
4e6d4720 | 294 | int skip, len; |
3c4d7559 | 295 | |
d829e9c4 DB |
296 | /* We add page references worth len bytes from encrypted sg |
297 | * at the end of plaintext sg. It is guaranteed that msg_en | |
4e6d4720 VG |
298 | * has enough required room (ensured by caller). |
299 | */ | |
d829e9c4 | 300 | len = required - msg_pl->sg.size; |
52ea992c | 301 | |
d829e9c4 DB |
302 | /* Skip initial bytes in msg_en's data to be able to use |
303 | * same offset of both plain and encrypted data. | |
4e6d4720 | 304 | */ |
4509de14 | 305 | skip = prot->prepend_size + msg_pl->sg.size; |
4e6d4720 | 306 | |
d829e9c4 | 307 | return sk_msg_clone(sk, msg_pl, msg_en, skip, len); |
3c4d7559 DW |
308 | } |
309 | ||
d3b18ad3 | 310 | static struct tls_rec *tls_get_rec(struct sock *sk) |
3c4d7559 DW |
311 | { |
312 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
4509de14 | 313 | struct tls_prot_info *prot = &tls_ctx->prot_info; |
f66de3ee | 314 | struct tls_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx); |
d3b18ad3 JF |
315 | struct sk_msg *msg_pl, *msg_en; |
316 | struct tls_rec *rec; | |
317 | int mem_size; | |
3c4d7559 | 318 | |
d3b18ad3 JF |
319 | mem_size = sizeof(struct tls_rec) + crypto_aead_reqsize(ctx->aead_send); |
320 | ||
321 | rec = kzalloc(mem_size, sk->sk_allocation); | |
a42055e8 | 322 | if (!rec) |
d3b18ad3 JF |
323 | return NULL; |
324 | ||
325 | msg_pl = &rec->msg_plaintext; | |
326 | msg_en = &rec->msg_encrypted; | |
327 | ||
328 | sk_msg_init(msg_pl); | |
329 | sk_msg_init(msg_en); | |
330 | ||
331 | sg_init_table(rec->sg_aead_in, 2); | |
4509de14 | 332 | sg_set_buf(&rec->sg_aead_in[0], rec->aad_space, prot->aad_size); |
d3b18ad3 JF |
333 | sg_unmark_end(&rec->sg_aead_in[1]); |
334 | ||
335 | sg_init_table(rec->sg_aead_out, 2); | |
4509de14 | 336 | sg_set_buf(&rec->sg_aead_out[0], rec->aad_space, prot->aad_size); |
d3b18ad3 JF |
337 | sg_unmark_end(&rec->sg_aead_out[1]); |
338 | ||
339 | return rec; | |
340 | } | |
a42055e8 | 341 | |
d3b18ad3 JF |
342 | static void tls_free_rec(struct sock *sk, struct tls_rec *rec) |
343 | { | |
d829e9c4 DB |
344 | sk_msg_free(sk, &rec->msg_encrypted); |
345 | sk_msg_free(sk, &rec->msg_plaintext); | |
c774973e | 346 | kfree(rec); |
a42055e8 VG |
347 | } |
348 | ||
d3b18ad3 JF |
349 | static void tls_free_open_rec(struct sock *sk) |
350 | { | |
351 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
352 | struct tls_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx); | |
353 | struct tls_rec *rec = ctx->open_rec; | |
354 | ||
355 | if (rec) { | |
356 | tls_free_rec(sk, rec); | |
357 | ctx->open_rec = NULL; | |
358 | } | |
359 | } | |
360 | ||
a42055e8 VG |
361 | int tls_tx_records(struct sock *sk, int flags) |
362 | { | |
363 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
364 | struct tls_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx); | |
365 | struct tls_rec *rec, *tmp; | |
d829e9c4 | 366 | struct sk_msg *msg_en; |
a42055e8 VG |
367 | int tx_flags, rc = 0; |
368 | ||
369 | if (tls_is_partially_sent_record(tls_ctx)) { | |
9932a29a | 370 | rec = list_first_entry(&ctx->tx_list, |
a42055e8 VG |
371 | struct tls_rec, list); |
372 | ||
373 | if (flags == -1) | |
374 | tx_flags = rec->tx_flags; | |
375 | else | |
376 | tx_flags = flags; | |
377 | ||
378 | rc = tls_push_partial_record(sk, tls_ctx, tx_flags); | |
379 | if (rc) | |
380 | goto tx_err; | |
381 | ||
382 | /* Full record has been transmitted. | |
9932a29a | 383 | * Remove the head of tx_list |
a42055e8 | 384 | */ |
a42055e8 | 385 | list_del(&rec->list); |
d829e9c4 | 386 | sk_msg_free(sk, &rec->msg_plaintext); |
a42055e8 VG |
387 | kfree(rec); |
388 | } | |
389 | ||
9932a29a VG |
390 | /* Tx all ready records */ |
391 | list_for_each_entry_safe(rec, tmp, &ctx->tx_list, list) { | |
392 | if (READ_ONCE(rec->tx_ready)) { | |
a42055e8 VG |
393 | if (flags == -1) |
394 | tx_flags = rec->tx_flags; | |
395 | else | |
396 | tx_flags = flags; | |
397 | ||
d829e9c4 | 398 | msg_en = &rec->msg_encrypted; |
a42055e8 | 399 | rc = tls_push_sg(sk, tls_ctx, |
d829e9c4 | 400 | &msg_en->sg.data[msg_en->sg.curr], |
a42055e8 VG |
401 | 0, tx_flags); |
402 | if (rc) | |
403 | goto tx_err; | |
404 | ||
a42055e8 | 405 | list_del(&rec->list); |
d829e9c4 | 406 | sk_msg_free(sk, &rec->msg_plaintext); |
a42055e8 VG |
407 | kfree(rec); |
408 | } else { | |
409 | break; | |
410 | } | |
411 | } | |
412 | ||
413 | tx_err: | |
414 | if (rc < 0 && rc != -EAGAIN) | |
da353fac | 415 | tls_err_abort(sk, -EBADMSG); |
a42055e8 VG |
416 | |
417 | return rc; | |
418 | } | |
419 | ||
420 | static void tls_encrypt_done(struct crypto_async_request *req, int err) | |
421 | { | |
422 | struct aead_request *aead_req = (struct aead_request *)req; | |
423 | struct sock *sk = req->data; | |
424 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
4509de14 | 425 | struct tls_prot_info *prot = &tls_ctx->prot_info; |
a42055e8 | 426 | struct tls_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx); |
d829e9c4 DB |
427 | struct scatterlist *sge; |
428 | struct sk_msg *msg_en; | |
a42055e8 VG |
429 | struct tls_rec *rec; |
430 | bool ready = false; | |
431 | int pending; | |
432 | ||
433 | rec = container_of(aead_req, struct tls_rec, aead_req); | |
d829e9c4 | 434 | msg_en = &rec->msg_encrypted; |
a42055e8 | 435 | |
d829e9c4 | 436 | sge = sk_msg_elem(msg_en, msg_en->sg.curr); |
4509de14 VG |
437 | sge->offset -= prot->prepend_size; |
438 | sge->length += prot->prepend_size; | |
a42055e8 | 439 | |
80ece6a0 | 440 | /* Check if error is previously set on socket */ |
a42055e8 | 441 | if (err || sk->sk_err) { |
a42055e8 VG |
442 | rec = NULL; |
443 | ||
444 | /* If err is already set on socket, return the same code */ | |
445 | if (sk->sk_err) { | |
1d9d6fd2 | 446 | ctx->async_wait.err = -sk->sk_err; |
a42055e8 VG |
447 | } else { |
448 | ctx->async_wait.err = err; | |
449 | tls_err_abort(sk, err); | |
450 | } | |
451 | } | |
452 | ||
9932a29a VG |
453 | if (rec) { |
454 | struct tls_rec *first_rec; | |
455 | ||
456 | /* Mark the record as ready for transmission */ | |
457 | smp_store_mb(rec->tx_ready, true); | |
458 | ||
459 | /* If received record is at head of tx_list, schedule tx */ | |
460 | first_rec = list_first_entry(&ctx->tx_list, | |
461 | struct tls_rec, list); | |
462 | if (rec == first_rec) | |
463 | ready = true; | |
464 | } | |
a42055e8 | 465 | |
0cada332 | 466 | spin_lock_bh(&ctx->encrypt_compl_lock); |
a42055e8 VG |
467 | pending = atomic_dec_return(&ctx->encrypt_pending); |
468 | ||
0cada332 | 469 | if (!pending && ctx->async_notify) |
a42055e8 | 470 | complete(&ctx->async_wait.completion); |
0cada332 | 471 | spin_unlock_bh(&ctx->encrypt_compl_lock); |
a42055e8 VG |
472 | |
473 | if (!ready) | |
474 | return; | |
475 | ||
476 | /* Schedule the transmission */ | |
477 | if (!test_and_set_bit(BIT_TX_SCHEDULED, &ctx->tx_bitmask)) | |
d829e9c4 | 478 | schedule_delayed_work(&ctx->tx_work.work, 1); |
3c4d7559 DW |
479 | } |
480 | ||
a42055e8 VG |
481 | static int tls_do_encryption(struct sock *sk, |
482 | struct tls_context *tls_ctx, | |
a447da7d DB |
483 | struct tls_sw_context_tx *ctx, |
484 | struct aead_request *aead_req, | |
d829e9c4 | 485 | size_t data_len, u32 start) |
3c4d7559 | 486 | { |
4509de14 | 487 | struct tls_prot_info *prot = &tls_ctx->prot_info; |
a42055e8 | 488 | struct tls_rec *rec = ctx->open_rec; |
d829e9c4 DB |
489 | struct sk_msg *msg_en = &rec->msg_encrypted; |
490 | struct scatterlist *sge = sk_msg_elem(msg_en, start); | |
f295b3ae VG |
491 | int rc, iv_offset = 0; |
492 | ||
493 | /* For CCM based ciphers, first byte of IV is a constant */ | |
128cfb88 TZ |
494 | switch (prot->cipher_type) { |
495 | case TLS_CIPHER_AES_CCM_128: | |
f295b3ae VG |
496 | rec->iv_data[0] = TLS_AES_CCM_IV_B0_BYTE; |
497 | iv_offset = 1; | |
128cfb88 TZ |
498 | break; |
499 | case TLS_CIPHER_SM4_CCM: | |
500 | rec->iv_data[0] = TLS_SM4_CCM_IV_B0_BYTE; | |
501 | iv_offset = 1; | |
502 | break; | |
f295b3ae VG |
503 | } |
504 | ||
505 | memcpy(&rec->iv_data[iv_offset], tls_ctx->tx.iv, | |
506 | prot->iv_size + prot->salt_size); | |
3c4d7559 | 507 | |
58790314 JK |
508 | tls_xor_iv_with_seq(prot, rec->iv_data + iv_offset, |
509 | tls_ctx->tx.rec_seq); | |
32eb67b9 | 510 | |
4509de14 VG |
511 | sge->offset += prot->prepend_size; |
512 | sge->length -= prot->prepend_size; | |
3c4d7559 | 513 | |
d829e9c4 | 514 | msg_en->sg.curr = start; |
4e6d4720 | 515 | |
3c4d7559 | 516 | aead_request_set_tfm(aead_req, ctx->aead_send); |
4509de14 | 517 | aead_request_set_ad(aead_req, prot->aad_size); |
d829e9c4 DB |
518 | aead_request_set_crypt(aead_req, rec->sg_aead_in, |
519 | rec->sg_aead_out, | |
32eb67b9 | 520 | data_len, rec->iv_data); |
a54667f6 VG |
521 | |
522 | aead_request_set_callback(aead_req, CRYPTO_TFM_REQ_MAY_BACKLOG, | |
a42055e8 VG |
523 | tls_encrypt_done, sk); |
524 | ||
9932a29a VG |
525 | /* Add the record in tx_list */ |
526 | list_add_tail((struct list_head *)&rec->list, &ctx->tx_list); | |
a42055e8 | 527 | atomic_inc(&ctx->encrypt_pending); |
a54667f6 | 528 | |
a42055e8 VG |
529 | rc = crypto_aead_encrypt(aead_req); |
530 | if (!rc || rc != -EINPROGRESS) { | |
531 | atomic_dec(&ctx->encrypt_pending); | |
4509de14 VG |
532 | sge->offset -= prot->prepend_size; |
533 | sge->length += prot->prepend_size; | |
a42055e8 | 534 | } |
3c4d7559 | 535 | |
9932a29a VG |
536 | if (!rc) { |
537 | WRITE_ONCE(rec->tx_ready, true); | |
538 | } else if (rc != -EINPROGRESS) { | |
539 | list_del(&rec->list); | |
a42055e8 | 540 | return rc; |
9932a29a | 541 | } |
3c4d7559 | 542 | |
a42055e8 VG |
543 | /* Unhook the record from context if encryption is not failure */ |
544 | ctx->open_rec = NULL; | |
fb0f886f | 545 | tls_advance_record_sn(sk, prot, &tls_ctx->tx); |
3c4d7559 DW |
546 | return rc; |
547 | } | |
548 | ||
d3b18ad3 JF |
549 | static int tls_split_open_record(struct sock *sk, struct tls_rec *from, |
550 | struct tls_rec **to, struct sk_msg *msg_opl, | |
551 | struct sk_msg *msg_oen, u32 split_point, | |
552 | u32 tx_overhead_size, u32 *orig_end) | |
553 | { | |
554 | u32 i, j, bytes = 0, apply = msg_opl->apply_bytes; | |
555 | struct scatterlist *sge, *osge, *nsge; | |
556 | u32 orig_size = msg_opl->sg.size; | |
557 | struct scatterlist tmp = { }; | |
558 | struct sk_msg *msg_npl; | |
559 | struct tls_rec *new; | |
560 | int ret; | |
561 | ||
562 | new = tls_get_rec(sk); | |
563 | if (!new) | |
564 | return -ENOMEM; | |
565 | ret = sk_msg_alloc(sk, &new->msg_encrypted, msg_opl->sg.size + | |
566 | tx_overhead_size, 0); | |
567 | if (ret < 0) { | |
568 | tls_free_rec(sk, new); | |
569 | return ret; | |
570 | } | |
571 | ||
572 | *orig_end = msg_opl->sg.end; | |
573 | i = msg_opl->sg.start; | |
574 | sge = sk_msg_elem(msg_opl, i); | |
575 | while (apply && sge->length) { | |
576 | if (sge->length > apply) { | |
577 | u32 len = sge->length - apply; | |
578 | ||
579 | get_page(sg_page(sge)); | |
580 | sg_set_page(&tmp, sg_page(sge), len, | |
581 | sge->offset + apply); | |
582 | sge->length = apply; | |
583 | bytes += apply; | |
584 | apply = 0; | |
585 | } else { | |
586 | apply -= sge->length; | |
587 | bytes += sge->length; | |
588 | } | |
589 | ||
590 | sk_msg_iter_var_next(i); | |
591 | if (i == msg_opl->sg.end) | |
592 | break; | |
593 | sge = sk_msg_elem(msg_opl, i); | |
594 | } | |
595 | ||
596 | msg_opl->sg.end = i; | |
597 | msg_opl->sg.curr = i; | |
598 | msg_opl->sg.copybreak = 0; | |
599 | msg_opl->apply_bytes = 0; | |
600 | msg_opl->sg.size = bytes; | |
601 | ||
602 | msg_npl = &new->msg_plaintext; | |
603 | msg_npl->apply_bytes = apply; | |
604 | msg_npl->sg.size = orig_size - bytes; | |
605 | ||
606 | j = msg_npl->sg.start; | |
607 | nsge = sk_msg_elem(msg_npl, j); | |
608 | if (tmp.length) { | |
609 | memcpy(nsge, &tmp, sizeof(*nsge)); | |
610 | sk_msg_iter_var_next(j); | |
611 | nsge = sk_msg_elem(msg_npl, j); | |
612 | } | |
613 | ||
614 | osge = sk_msg_elem(msg_opl, i); | |
615 | while (osge->length) { | |
616 | memcpy(nsge, osge, sizeof(*nsge)); | |
617 | sg_unmark_end(nsge); | |
618 | sk_msg_iter_var_next(i); | |
619 | sk_msg_iter_var_next(j); | |
620 | if (i == *orig_end) | |
621 | break; | |
622 | osge = sk_msg_elem(msg_opl, i); | |
623 | nsge = sk_msg_elem(msg_npl, j); | |
624 | } | |
625 | ||
626 | msg_npl->sg.end = j; | |
627 | msg_npl->sg.curr = j; | |
628 | msg_npl->sg.copybreak = 0; | |
629 | ||
630 | *to = new; | |
631 | return 0; | |
632 | } | |
633 | ||
634 | static void tls_merge_open_record(struct sock *sk, struct tls_rec *to, | |
635 | struct tls_rec *from, u32 orig_end) | |
636 | { | |
637 | struct sk_msg *msg_npl = &from->msg_plaintext; | |
638 | struct sk_msg *msg_opl = &to->msg_plaintext; | |
639 | struct scatterlist *osge, *nsge; | |
640 | u32 i, j; | |
641 | ||
642 | i = msg_opl->sg.end; | |
643 | sk_msg_iter_var_prev(i); | |
644 | j = msg_npl->sg.start; | |
645 | ||
646 | osge = sk_msg_elem(msg_opl, i); | |
647 | nsge = sk_msg_elem(msg_npl, j); | |
648 | ||
649 | if (sg_page(osge) == sg_page(nsge) && | |
650 | osge->offset + osge->length == nsge->offset) { | |
651 | osge->length += nsge->length; | |
652 | put_page(sg_page(nsge)); | |
653 | } | |
654 | ||
655 | msg_opl->sg.end = orig_end; | |
656 | msg_opl->sg.curr = orig_end; | |
657 | msg_opl->sg.copybreak = 0; | |
658 | msg_opl->apply_bytes = msg_opl->sg.size + msg_npl->sg.size; | |
659 | msg_opl->sg.size += msg_npl->sg.size; | |
660 | ||
661 | sk_msg_free(sk, &to->msg_encrypted); | |
662 | sk_msg_xfer_full(&to->msg_encrypted, &from->msg_encrypted); | |
663 | ||
664 | kfree(from); | |
665 | } | |
666 | ||
3c4d7559 DW |
667 | static int tls_push_record(struct sock *sk, int flags, |
668 | unsigned char record_type) | |
669 | { | |
670 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
4509de14 | 671 | struct tls_prot_info *prot = &tls_ctx->prot_info; |
f66de3ee | 672 | struct tls_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx); |
d3b18ad3 | 673 | struct tls_rec *rec = ctx->open_rec, *tmp = NULL; |
3f649ab7 | 674 | u32 i, split_point, orig_end; |
d829e9c4 | 675 | struct sk_msg *msg_pl, *msg_en; |
a447da7d | 676 | struct aead_request *req; |
d3b18ad3 | 677 | bool split; |
3c4d7559 DW |
678 | int rc; |
679 | ||
a42055e8 VG |
680 | if (!rec) |
681 | return 0; | |
a447da7d | 682 | |
d829e9c4 DB |
683 | msg_pl = &rec->msg_plaintext; |
684 | msg_en = &rec->msg_encrypted; | |
685 | ||
d3b18ad3 JF |
686 | split_point = msg_pl->apply_bytes; |
687 | split = split_point && split_point < msg_pl->sg.size; | |
d468e477 JF |
688 | if (unlikely((!split && |
689 | msg_pl->sg.size + | |
690 | prot->overhead_size > msg_en->sg.size) || | |
691 | (split && | |
692 | split_point + | |
693 | prot->overhead_size > msg_en->sg.size))) { | |
694 | split = true; | |
695 | split_point = msg_en->sg.size; | |
696 | } | |
d3b18ad3 JF |
697 | if (split) { |
698 | rc = tls_split_open_record(sk, rec, &tmp, msg_pl, msg_en, | |
4509de14 | 699 | split_point, prot->overhead_size, |
d3b18ad3 JF |
700 | &orig_end); |
701 | if (rc < 0) | |
702 | return rc; | |
d468e477 JF |
703 | /* This can happen if above tls_split_open_record allocates |
704 | * a single large encryption buffer instead of two smaller | |
705 | * ones. In this case adjust pointers and continue without | |
706 | * split. | |
707 | */ | |
708 | if (!msg_pl->sg.size) { | |
709 | tls_merge_open_record(sk, rec, tmp, orig_end); | |
710 | msg_pl = &rec->msg_plaintext; | |
711 | msg_en = &rec->msg_encrypted; | |
712 | split = false; | |
713 | } | |
d3b18ad3 | 714 | sk_msg_trim(sk, msg_en, msg_pl->sg.size + |
4509de14 | 715 | prot->overhead_size); |
d3b18ad3 JF |
716 | } |
717 | ||
a42055e8 VG |
718 | rec->tx_flags = flags; |
719 | req = &rec->aead_req; | |
3c4d7559 | 720 | |
d829e9c4 DB |
721 | i = msg_pl->sg.end; |
722 | sk_msg_iter_var_prev(i); | |
130b392c DW |
723 | |
724 | rec->content_type = record_type; | |
4509de14 | 725 | if (prot->version == TLS_1_3_VERSION) { |
130b392c DW |
726 | /* Add content type to end of message. No padding added */ |
727 | sg_set_buf(&rec->sg_content_type, &rec->content_type, 1); | |
728 | sg_mark_end(&rec->sg_content_type); | |
729 | sg_chain(msg_pl->sg.data, msg_pl->sg.end + 1, | |
730 | &rec->sg_content_type); | |
731 | } else { | |
732 | sg_mark_end(sk_msg_elem(msg_pl, i)); | |
733 | } | |
a42055e8 | 734 | |
9aaaa568 JF |
735 | if (msg_pl->sg.end < msg_pl->sg.start) { |
736 | sg_chain(&msg_pl->sg.data[msg_pl->sg.start], | |
737 | MAX_SKB_FRAGS - msg_pl->sg.start + 1, | |
738 | msg_pl->sg.data); | |
739 | } | |
740 | ||
d829e9c4 | 741 | i = msg_pl->sg.start; |
9e5ffed3 | 742 | sg_chain(rec->sg_aead_in, 2, &msg_pl->sg.data[i]); |
d829e9c4 DB |
743 | |
744 | i = msg_en->sg.end; | |
745 | sk_msg_iter_var_prev(i); | |
746 | sg_mark_end(sk_msg_elem(msg_en, i)); | |
747 | ||
748 | i = msg_en->sg.start; | |
749 | sg_chain(rec->sg_aead_out, 2, &msg_en->sg.data[i]); | |
750 | ||
4509de14 | 751 | tls_make_aad(rec->aad_space, msg_pl->sg.size + prot->tail_size, |
6942a284 | 752 | tls_ctx->tx.rec_seq, record_type, prot); |
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 | 757 | msg_pl->sg.size + prot->tail_size, |
6942a284 | 758 | record_type); |
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) { |
da353fac | 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 | 937 | |
1c3b63f1 RC |
938 | if (msg->msg_flags & ~(MSG_MORE | MSG_DONTWAIT | MSG_NOSIGNAL | |
939 | MSG_CMSG_COMPAT)) | |
4a5cdc60 | 940 | return -EOPNOTSUPP; |
3c4d7559 | 941 | |
79ffe608 | 942 | mutex_lock(&tls_ctx->tx_lock); |
3c4d7559 DW |
943 | lock_sock(sk); |
944 | ||
3c4d7559 | 945 | if (unlikely(msg->msg_controllen)) { |
58790314 | 946 | ret = tls_process_cmsg(sk, msg, &record_type); |
a42055e8 VG |
947 | if (ret) { |
948 | if (ret == -EINPROGRESS) | |
949 | num_async++; | |
950 | else if (ret != -EAGAIN) | |
951 | goto send_end; | |
952 | } | |
3c4d7559 DW |
953 | } |
954 | ||
955 | while (msg_data_left(msg)) { | |
956 | if (sk->sk_err) { | |
30be8f8d | 957 | ret = -sk->sk_err; |
3c4d7559 DW |
958 | goto send_end; |
959 | } | |
960 | ||
d3b18ad3 JF |
961 | if (ctx->open_rec) |
962 | rec = ctx->open_rec; | |
963 | else | |
964 | rec = ctx->open_rec = tls_get_rec(sk); | |
a42055e8 VG |
965 | if (!rec) { |
966 | ret = -ENOMEM; | |
967 | goto send_end; | |
968 | } | |
969 | ||
d829e9c4 DB |
970 | msg_pl = &rec->msg_plaintext; |
971 | msg_en = &rec->msg_encrypted; | |
972 | ||
973 | orig_size = msg_pl->sg.size; | |
3c4d7559 DW |
974 | full_record = false; |
975 | try_to_copy = msg_data_left(msg); | |
d829e9c4 | 976 | record_room = TLS_MAX_PAYLOAD_SIZE - msg_pl->sg.size; |
3c4d7559 DW |
977 | if (try_to_copy >= record_room) { |
978 | try_to_copy = record_room; | |
979 | full_record = true; | |
980 | } | |
981 | ||
d829e9c4 | 982 | required_size = msg_pl->sg.size + try_to_copy + |
4509de14 | 983 | prot->overhead_size; |
3c4d7559 DW |
984 | |
985 | if (!sk_stream_memory_free(sk)) | |
986 | goto wait_for_sndbuf; | |
a42055e8 | 987 | |
3c4d7559 | 988 | alloc_encrypted: |
d829e9c4 | 989 | ret = tls_alloc_encrypted_msg(sk, required_size); |
3c4d7559 DW |
990 | if (ret) { |
991 | if (ret != -ENOSPC) | |
992 | goto wait_for_memory; | |
993 | ||
994 | /* Adjust try_to_copy according to the amount that was | |
995 | * actually allocated. The difference is due | |
996 | * to max sg elements limit | |
997 | */ | |
d829e9c4 | 998 | try_to_copy -= required_size - msg_en->sg.size; |
3c4d7559 DW |
999 | full_record = true; |
1000 | } | |
a42055e8 VG |
1001 | |
1002 | if (!is_kvec && (full_record || eor) && !async_capable) { | |
d3b18ad3 JF |
1003 | u32 first = msg_pl->sg.end; |
1004 | ||
d829e9c4 DB |
1005 | ret = sk_msg_zerocopy_from_iter(sk, &msg->msg_iter, |
1006 | msg_pl, try_to_copy); | |
3c4d7559 DW |
1007 | if (ret) |
1008 | goto fallback_to_reg_send; | |
1009 | ||
a42055e8 | 1010 | num_zc++; |
3c4d7559 | 1011 | copied += try_to_copy; |
d3b18ad3 JF |
1012 | |
1013 | sk_msg_sg_copy_set(msg_pl, first); | |
1014 | ret = bpf_exec_tx_verdict(msg_pl, sk, full_record, | |
1015 | record_type, &copied, | |
1016 | msg->msg_flags); | |
a42055e8 VG |
1017 | if (ret) { |
1018 | if (ret == -EINPROGRESS) | |
1019 | num_async++; | |
d3b18ad3 JF |
1020 | else if (ret == -ENOMEM) |
1021 | goto wait_for_memory; | |
c329ef96 | 1022 | else if (ctx->open_rec && ret == -ENOSPC) |
d3b18ad3 | 1023 | goto rollback_iter; |
a42055e8 VG |
1024 | else if (ret != -EAGAIN) |
1025 | goto send_end; | |
1026 | } | |
5a3611ef | 1027 | continue; |
d3b18ad3 JF |
1028 | rollback_iter: |
1029 | copied -= try_to_copy; | |
1030 | sk_msg_sg_copy_clear(msg_pl, first); | |
1031 | iov_iter_revert(&msg->msg_iter, | |
1032 | msg_pl->sg.size - orig_size); | |
3c4d7559 | 1033 | fallback_to_reg_send: |
d829e9c4 | 1034 | sk_msg_trim(sk, msg_pl, orig_size); |
3c4d7559 DW |
1035 | } |
1036 | ||
d829e9c4 | 1037 | required_size = msg_pl->sg.size + try_to_copy; |
4e6d4720 | 1038 | |
d829e9c4 | 1039 | ret = tls_clone_plaintext_msg(sk, required_size); |
3c4d7559 DW |
1040 | if (ret) { |
1041 | if (ret != -ENOSPC) | |
4e6d4720 | 1042 | goto send_end; |
3c4d7559 DW |
1043 | |
1044 | /* Adjust try_to_copy according to the amount that was | |
1045 | * actually allocated. The difference is due | |
1046 | * to max sg elements limit | |
1047 | */ | |
d829e9c4 | 1048 | try_to_copy -= required_size - msg_pl->sg.size; |
3c4d7559 | 1049 | full_record = true; |
4509de14 VG |
1050 | sk_msg_trim(sk, msg_en, |
1051 | msg_pl->sg.size + prot->overhead_size); | |
3c4d7559 DW |
1052 | } |
1053 | ||
65a10e28 VG |
1054 | if (try_to_copy) { |
1055 | ret = sk_msg_memcopy_from_iter(sk, &msg->msg_iter, | |
1056 | msg_pl, try_to_copy); | |
1057 | if (ret < 0) | |
1058 | goto trim_sgl; | |
1059 | } | |
3c4d7559 | 1060 | |
d829e9c4 DB |
1061 | /* Open records defined only if successfully copied, otherwise |
1062 | * we would trim the sg but not reset the open record frags. | |
1063 | */ | |
1064 | tls_ctx->pending_open_record_frags = true; | |
3c4d7559 DW |
1065 | copied += try_to_copy; |
1066 | if (full_record || eor) { | |
d3b18ad3 JF |
1067 | ret = bpf_exec_tx_verdict(msg_pl, sk, full_record, |
1068 | record_type, &copied, | |
1069 | msg->msg_flags); | |
3c4d7559 | 1070 | if (ret) { |
a42055e8 VG |
1071 | if (ret == -EINPROGRESS) |
1072 | num_async++; | |
d3b18ad3 JF |
1073 | else if (ret == -ENOMEM) |
1074 | goto wait_for_memory; | |
1075 | else if (ret != -EAGAIN) { | |
1076 | if (ret == -ENOSPC) | |
1077 | ret = 0; | |
a42055e8 | 1078 | goto send_end; |
d3b18ad3 | 1079 | } |
3c4d7559 DW |
1080 | } |
1081 | } | |
1082 | ||
1083 | continue; | |
1084 | ||
1085 | wait_for_sndbuf: | |
1086 | set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); | |
1087 | wait_for_memory: | |
1088 | ret = sk_stream_wait_memory(sk, &timeo); | |
1089 | if (ret) { | |
1090 | trim_sgl: | |
c329ef96 JK |
1091 | if (ctx->open_rec) |
1092 | tls_trim_both_msgs(sk, orig_size); | |
3c4d7559 DW |
1093 | goto send_end; |
1094 | } | |
1095 | ||
c329ef96 | 1096 | if (ctx->open_rec && msg_en->sg.size < required_size) |
3c4d7559 | 1097 | goto alloc_encrypted; |
3c4d7559 DW |
1098 | } |
1099 | ||
a42055e8 VG |
1100 | if (!num_async) { |
1101 | goto send_end; | |
1102 | } else if (num_zc) { | |
1103 | /* Wait for pending encryptions to get completed */ | |
0cada332 VKY |
1104 | spin_lock_bh(&ctx->encrypt_compl_lock); |
1105 | ctx->async_notify = true; | |
a42055e8 | 1106 | |
0cada332 VKY |
1107 | pending = atomic_read(&ctx->encrypt_pending); |
1108 | spin_unlock_bh(&ctx->encrypt_compl_lock); | |
1109 | if (pending) | |
a42055e8 VG |
1110 | crypto_wait_req(-EINPROGRESS, &ctx->async_wait); |
1111 | else | |
1112 | reinit_completion(&ctx->async_wait.completion); | |
1113 | ||
0cada332 VKY |
1114 | /* There can be no concurrent accesses, since we have no |
1115 | * pending encrypt operations | |
1116 | */ | |
a42055e8 VG |
1117 | WRITE_ONCE(ctx->async_notify, false); |
1118 | ||
1119 | if (ctx->async_wait.err) { | |
1120 | ret = ctx->async_wait.err; | |
1121 | copied = 0; | |
1122 | } | |
1123 | } | |
1124 | ||
1125 | /* Transmit if any encryptions have completed */ | |
1126 | if (test_and_clear_bit(BIT_TX_SCHEDULED, &ctx->tx_bitmask)) { | |
1127 | cancel_delayed_work(&ctx->tx_work.work); | |
1128 | tls_tx_records(sk, msg->msg_flags); | |
1129 | } | |
1130 | ||
3c4d7559 DW |
1131 | send_end: |
1132 | ret = sk_stream_error(sk, msg->msg_flags, ret); | |
1133 | ||
1134 | release_sock(sk); | |
79ffe608 | 1135 | mutex_unlock(&tls_ctx->tx_lock); |
a7bff11f | 1136 | return copied > 0 ? copied : ret; |
3c4d7559 DW |
1137 | } |
1138 | ||
01cb8a1a Y |
1139 | static int tls_sw_do_sendpage(struct sock *sk, struct page *page, |
1140 | int offset, size_t size, int flags) | |
3c4d7559 | 1141 | { |
a42055e8 | 1142 | long timeo = sock_sndtimeo(sk, flags & MSG_DONTWAIT); |
3c4d7559 | 1143 | struct tls_context *tls_ctx = tls_get_ctx(sk); |
f66de3ee | 1144 | struct tls_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx); |
4509de14 | 1145 | struct tls_prot_info *prot = &tls_ctx->prot_info; |
3c4d7559 | 1146 | unsigned char record_type = TLS_RECORD_TYPE_DATA; |
d829e9c4 | 1147 | struct sk_msg *msg_pl; |
a42055e8 VG |
1148 | struct tls_rec *rec; |
1149 | int num_async = 0; | |
a7bff11f | 1150 | ssize_t copied = 0; |
3c4d7559 DW |
1151 | bool full_record; |
1152 | int record_room; | |
4128c0cf | 1153 | int ret = 0; |
a42055e8 | 1154 | bool eor; |
3c4d7559 | 1155 | |
d452d48b | 1156 | eor = !(flags & MSG_SENDPAGE_NOTLAST); |
3c4d7559 DW |
1157 | sk_clear_bit(SOCKWQ_ASYNC_NOSPACE, sk); |
1158 | ||
3c4d7559 DW |
1159 | /* Call the sk_stream functions to manage the sndbuf mem. */ |
1160 | while (size > 0) { | |
1161 | size_t copy, required_size; | |
1162 | ||
1163 | if (sk->sk_err) { | |
30be8f8d | 1164 | ret = -sk->sk_err; |
3c4d7559 DW |
1165 | goto sendpage_end; |
1166 | } | |
1167 | ||
d3b18ad3 JF |
1168 | if (ctx->open_rec) |
1169 | rec = ctx->open_rec; | |
1170 | else | |
1171 | rec = ctx->open_rec = tls_get_rec(sk); | |
a42055e8 VG |
1172 | if (!rec) { |
1173 | ret = -ENOMEM; | |
1174 | goto sendpage_end; | |
1175 | } | |
1176 | ||
d829e9c4 DB |
1177 | msg_pl = &rec->msg_plaintext; |
1178 | ||
3c4d7559 | 1179 | full_record = false; |
d829e9c4 | 1180 | record_room = TLS_MAX_PAYLOAD_SIZE - msg_pl->sg.size; |
3c4d7559 DW |
1181 | copy = size; |
1182 | if (copy >= record_room) { | |
1183 | copy = record_room; | |
1184 | full_record = true; | |
1185 | } | |
d829e9c4 | 1186 | |
4509de14 | 1187 | required_size = msg_pl->sg.size + copy + prot->overhead_size; |
3c4d7559 DW |
1188 | |
1189 | if (!sk_stream_memory_free(sk)) | |
1190 | goto wait_for_sndbuf; | |
1191 | alloc_payload: | |
d829e9c4 | 1192 | ret = tls_alloc_encrypted_msg(sk, required_size); |
3c4d7559 DW |
1193 | if (ret) { |
1194 | if (ret != -ENOSPC) | |
1195 | goto wait_for_memory; | |
1196 | ||
1197 | /* Adjust copy according to the amount that was | |
1198 | * actually allocated. The difference is due | |
1199 | * to max sg elements limit | |
1200 | */ | |
d829e9c4 | 1201 | copy -= required_size - msg_pl->sg.size; |
3c4d7559 DW |
1202 | full_record = true; |
1203 | } | |
1204 | ||
d829e9c4 | 1205 | sk_msg_page_add(msg_pl, page, copy, offset); |
3c4d7559 | 1206 | sk_mem_charge(sk, copy); |
d829e9c4 | 1207 | |
3c4d7559 DW |
1208 | offset += copy; |
1209 | size -= copy; | |
d3b18ad3 | 1210 | copied += copy; |
3c4d7559 | 1211 | |
d829e9c4 DB |
1212 | tls_ctx->pending_open_record_frags = true; |
1213 | if (full_record || eor || sk_msg_full(msg_pl)) { | |
d3b18ad3 JF |
1214 | ret = bpf_exec_tx_verdict(msg_pl, sk, full_record, |
1215 | record_type, &copied, flags); | |
3c4d7559 | 1216 | if (ret) { |
a42055e8 VG |
1217 | if (ret == -EINPROGRESS) |
1218 | num_async++; | |
d3b18ad3 JF |
1219 | else if (ret == -ENOMEM) |
1220 | goto wait_for_memory; | |
1221 | else if (ret != -EAGAIN) { | |
1222 | if (ret == -ENOSPC) | |
1223 | ret = 0; | |
a42055e8 | 1224 | goto sendpage_end; |
d3b18ad3 | 1225 | } |
3c4d7559 DW |
1226 | } |
1227 | } | |
1228 | continue; | |
1229 | wait_for_sndbuf: | |
1230 | set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); | |
1231 | wait_for_memory: | |
1232 | ret = sk_stream_wait_memory(sk, &timeo); | |
1233 | if (ret) { | |
c329ef96 JK |
1234 | if (ctx->open_rec) |
1235 | tls_trim_both_msgs(sk, msg_pl->sg.size); | |
3c4d7559 DW |
1236 | goto sendpage_end; |
1237 | } | |
1238 | ||
c329ef96 JK |
1239 | if (ctx->open_rec) |
1240 | goto alloc_payload; | |
3c4d7559 DW |
1241 | } |
1242 | ||
a42055e8 VG |
1243 | if (num_async) { |
1244 | /* Transmit if any encryptions have completed */ | |
1245 | if (test_and_clear_bit(BIT_TX_SCHEDULED, &ctx->tx_bitmask)) { | |
1246 | cancel_delayed_work(&ctx->tx_work.work); | |
1247 | tls_tx_records(sk, flags); | |
1248 | } | |
1249 | } | |
3c4d7559 | 1250 | sendpage_end: |
d3b18ad3 | 1251 | ret = sk_stream_error(sk, flags, ret); |
a7bff11f | 1252 | return copied > 0 ? copied : ret; |
3c4d7559 DW |
1253 | } |
1254 | ||
d4ffb02d WB |
1255 | int tls_sw_sendpage_locked(struct sock *sk, struct page *page, |
1256 | int offset, size_t size, int flags) | |
1257 | { | |
1258 | if (flags & ~(MSG_MORE | MSG_DONTWAIT | MSG_NOSIGNAL | | |
1259 | MSG_SENDPAGE_NOTLAST | MSG_SENDPAGE_NOPOLICY | | |
1260 | MSG_NO_SHARED_FRAGS)) | |
4a5cdc60 | 1261 | return -EOPNOTSUPP; |
d4ffb02d WB |
1262 | |
1263 | return tls_sw_do_sendpage(sk, page, offset, size, flags); | |
1264 | } | |
1265 | ||
0608c69c JF |
1266 | int tls_sw_sendpage(struct sock *sk, struct page *page, |
1267 | int offset, size_t size, int flags) | |
1268 | { | |
79ffe608 | 1269 | struct tls_context *tls_ctx = tls_get_ctx(sk); |
0608c69c JF |
1270 | int ret; |
1271 | ||
1272 | if (flags & ~(MSG_MORE | MSG_DONTWAIT | MSG_NOSIGNAL | | |
1273 | MSG_SENDPAGE_NOTLAST | MSG_SENDPAGE_NOPOLICY)) | |
4a5cdc60 | 1274 | return -EOPNOTSUPP; |
0608c69c | 1275 | |
79ffe608 | 1276 | mutex_lock(&tls_ctx->tx_lock); |
0608c69c JF |
1277 | lock_sock(sk); |
1278 | ret = tls_sw_do_sendpage(sk, page, offset, size, flags); | |
1279 | release_sock(sk); | |
79ffe608 | 1280 | mutex_unlock(&tls_ctx->tx_lock); |
0608c69c JF |
1281 | return ret; |
1282 | } | |
1283 | ||
35560b7f JK |
1284 | static int |
1285 | tls_rx_rec_wait(struct sock *sk, struct sk_psock *psock, bool nonblock, | |
1286 | long timeo) | |
c46234eb DW |
1287 | { |
1288 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
f66de3ee | 1289 | struct tls_sw_context_rx *ctx = tls_sw_ctx_rx(tls_ctx); |
c46234eb DW |
1290 | DEFINE_WAIT_FUNC(wait, woken_wake_function); |
1291 | ||
b92a13d4 | 1292 | while (!tls_strp_msg_ready(ctx)) { |
35560b7f JK |
1293 | if (!sk_psock_queue_empty(psock)) |
1294 | return 0; | |
1295 | ||
1296 | if (sk->sk_err) | |
1297 | return sock_error(sk); | |
c46234eb | 1298 | |
20ffc7ad VF |
1299 | if (!skb_queue_empty(&sk->sk_receive_queue)) { |
1300 | __strp_unpause(&ctx->strp); | |
b92a13d4 | 1301 | if (tls_strp_msg_ready(ctx)) |
35560b7f | 1302 | break; |
20ffc7ad VF |
1303 | } |
1304 | ||
fcf4793e | 1305 | if (sk->sk_shutdown & RCV_SHUTDOWN) |
35560b7f | 1306 | return 0; |
fcf4793e | 1307 | |
c46234eb | 1308 | if (sock_flag(sk, SOCK_DONE)) |
35560b7f | 1309 | return 0; |
c46234eb | 1310 | |
35560b7f JK |
1311 | if (nonblock || !timeo) |
1312 | return -EAGAIN; | |
c46234eb DW |
1313 | |
1314 | add_wait_queue(sk_sleep(sk), &wait); | |
1315 | sk_set_bit(SOCKWQ_ASYNC_WAITDATA, sk); | |
d3b18ad3 | 1316 | sk_wait_event(sk, &timeo, |
b92a13d4 JK |
1317 | tls_strp_msg_ready(ctx) || |
1318 | !sk_psock_queue_empty(psock), | |
d3b18ad3 | 1319 | &wait); |
c46234eb DW |
1320 | sk_clear_bit(SOCKWQ_ASYNC_WAITDATA, sk); |
1321 | remove_wait_queue(sk_sleep(sk), &wait); | |
1322 | ||
1323 | /* Handle signals */ | |
35560b7f JK |
1324 | if (signal_pending(current)) |
1325 | return sock_intr_errno(timeo); | |
c46234eb DW |
1326 | } |
1327 | ||
35560b7f | 1328 | return 1; |
c46234eb DW |
1329 | } |
1330 | ||
d4bd88e6 | 1331 | static int tls_setup_from_iter(struct iov_iter *from, |
d829e9c4 | 1332 | int length, int *pages_used, |
d829e9c4 DB |
1333 | struct scatterlist *to, |
1334 | int to_max_pages) | |
1335 | { | |
1336 | int rc = 0, i = 0, num_elem = *pages_used, maxpages; | |
1337 | struct page *pages[MAX_SKB_FRAGS]; | |
d4bd88e6 | 1338 | unsigned int size = 0; |
d829e9c4 DB |
1339 | ssize_t copied, use; |
1340 | size_t offset; | |
1341 | ||
1342 | while (length > 0) { | |
1343 | i = 0; | |
1344 | maxpages = to_max_pages - num_elem; | |
1345 | if (maxpages == 0) { | |
1346 | rc = -EFAULT; | |
1347 | goto out; | |
1348 | } | |
1349 | copied = iov_iter_get_pages(from, pages, | |
1350 | length, | |
1351 | maxpages, &offset); | |
1352 | if (copied <= 0) { | |
1353 | rc = -EFAULT; | |
1354 | goto out; | |
1355 | } | |
1356 | ||
1357 | iov_iter_advance(from, copied); | |
1358 | ||
1359 | length -= copied; | |
1360 | size += copied; | |
1361 | while (copied) { | |
1362 | use = min_t(int, copied, PAGE_SIZE - offset); | |
1363 | ||
1364 | sg_set_page(&to[num_elem], | |
1365 | pages[i], use, offset); | |
1366 | sg_unmark_end(&to[num_elem]); | |
1367 | /* We do not uncharge memory from this API */ | |
1368 | ||
1369 | offset = 0; | |
1370 | copied -= use; | |
1371 | ||
1372 | i++; | |
1373 | num_elem++; | |
1374 | } | |
1375 | } | |
1376 | /* Mark the end in the last sg entry if newly added */ | |
1377 | if (num_elem > *pages_used) | |
1378 | sg_mark_end(&to[num_elem - 1]); | |
1379 | out: | |
1380 | if (rc) | |
d4bd88e6 | 1381 | iov_iter_revert(from, size); |
d829e9c4 DB |
1382 | *pages_used = num_elem; |
1383 | ||
1384 | return rc; | |
1385 | } | |
1386 | ||
fd31f399 JK |
1387 | static struct sk_buff * |
1388 | tls_alloc_clrtxt_skb(struct sock *sk, struct sk_buff *skb, | |
1389 | unsigned int full_len) | |
1390 | { | |
1391 | struct strp_msg *clr_rxm; | |
1392 | struct sk_buff *clr_skb; | |
1393 | int err; | |
1394 | ||
1395 | clr_skb = alloc_skb_with_frags(0, full_len, TLS_PAGE_ORDER, | |
1396 | &err, sk->sk_allocation); | |
1397 | if (!clr_skb) | |
1398 | return NULL; | |
1399 | ||
1400 | skb_copy_header(clr_skb, skb); | |
1401 | clr_skb->len = full_len; | |
1402 | clr_skb->data_len = full_len; | |
1403 | ||
1404 | clr_rxm = strp_msg(clr_skb); | |
1405 | clr_rxm->offset = 0; | |
1406 | ||
1407 | return clr_skb; | |
1408 | } | |
1409 | ||
8a958732 JK |
1410 | /* Decrypt handlers |
1411 | * | |
dd47ed36 | 1412 | * tls_decrypt_sw() and tls_decrypt_device() are decrypt handlers. |
8a958732 JK |
1413 | * They must transform the darg in/out argument are as follows: |
1414 | * | Input | Output | |
1415 | * ------------------------------------------------------------------- | |
1416 | * zc | Zero-copy decrypt allowed | Zero-copy performed | |
1417 | * async | Async decrypt allowed | Async crypto used / in progress | |
6bd116c8 | 1418 | * skb | * | Output skb |
b93f5700 JK |
1419 | * |
1420 | * If ZC decryption was performed darg.skb will point to the input skb. | |
8a958732 JK |
1421 | */ |
1422 | ||
0b243d00 | 1423 | /* This function decrypts the input skb into either out_iov or in out_sg |
8a958732 | 1424 | * or in skb buffers itself. The input parameter 'darg->zc' indicates if |
0b243d00 VG |
1425 | * zero-copy mode needs to be tried or not. With zero-copy mode, either |
1426 | * out_iov or out_sg must be non-NULL. In case both out_iov and out_sg are | |
1427 | * NULL, then the decryption happens inside skb buffers itself, i.e. | |
8a958732 | 1428 | * zero-copy gets disabled and 'darg->zc' is updated. |
0b243d00 | 1429 | */ |
541cc48b | 1430 | static int tls_decrypt_sg(struct sock *sk, struct iov_iter *out_iov, |
8a958732 JK |
1431 | struct scatterlist *out_sg, |
1432 | struct tls_decrypt_arg *darg) | |
0b243d00 VG |
1433 | { |
1434 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
1435 | struct tls_sw_context_rx *ctx = tls_sw_ctx_rx(tls_ctx); | |
4509de14 | 1436 | struct tls_prot_info *prot = &tls_ctx->prot_info; |
b89fec54 | 1437 | int n_sgin, n_sgout, aead_size, err, pages = 0; |
541cc48b | 1438 | struct sk_buff *skb = tls_strp_msg(ctx); |
fd31f399 JK |
1439 | const struct strp_msg *rxm = strp_msg(skb); |
1440 | const struct tls_msg *tlm = tls_msg(skb); | |
0b243d00 | 1441 | struct aead_request *aead_req; |
0b243d00 VG |
1442 | struct scatterlist *sgin = NULL; |
1443 | struct scatterlist *sgout = NULL; | |
603380f5 | 1444 | const int data_len = rxm->full_len - prot->overhead_size; |
ce61327c | 1445 | int tail_pages = !!prot->tail_size; |
b89fec54 | 1446 | struct tls_decrypt_ctx *dctx; |
fd31f399 | 1447 | struct sk_buff *clear_skb; |
f295b3ae | 1448 | int iv_offset = 0; |
b89fec54 | 1449 | u8 *mem; |
0b243d00 | 1450 | |
fd31f399 JK |
1451 | n_sgin = skb_nsg(skb, rxm->offset + prot->prepend_size, |
1452 | rxm->full_len - prot->prepend_size); | |
1453 | if (n_sgin < 1) | |
1454 | return n_sgin ?: -EBADMSG; | |
1455 | ||
4175eac3 | 1456 | if (darg->zc && (out_iov || out_sg)) { |
fd31f399 JK |
1457 | clear_skb = NULL; |
1458 | ||
0b243d00 | 1459 | if (out_iov) |
ce61327c | 1460 | n_sgout = 1 + tail_pages + |
b93235e6 | 1461 | iov_iter_npages_cap(out_iov, INT_MAX, data_len); |
0b243d00 VG |
1462 | else |
1463 | n_sgout = sg_nents(out_sg); | |
1464 | } else { | |
4175eac3 | 1465 | darg->zc = false; |
0b243d00 | 1466 | |
fd31f399 JK |
1467 | clear_skb = tls_alloc_clrtxt_skb(sk, skb, rxm->full_len); |
1468 | if (!clear_skb) | |
1469 | return -ENOMEM; | |
1470 | ||
1471 | n_sgout = 1 + skb_shinfo(clear_skb)->nr_frags; | |
1472 | } | |
0b243d00 VG |
1473 | |
1474 | /* Increment to accommodate AAD */ | |
1475 | n_sgin = n_sgin + 1; | |
1476 | ||
0b243d00 | 1477 | /* Allocate a single block of memory which contains |
b89fec54 JK |
1478 | * aead_req || tls_decrypt_ctx. |
1479 | * Both structs are variable length. | |
0b243d00 | 1480 | */ |
b89fec54 JK |
1481 | aead_size = sizeof(*aead_req) + crypto_aead_reqsize(ctx->aead_recv); |
1482 | mem = kmalloc(aead_size + struct_size(dctx, sg, n_sgin + n_sgout), | |
1483 | sk->sk_allocation); | |
fd31f399 JK |
1484 | if (!mem) { |
1485 | err = -ENOMEM; | |
1486 | goto exit_free_skb; | |
1487 | } | |
0b243d00 VG |
1488 | |
1489 | /* Segment the allocated memory */ | |
1490 | aead_req = (struct aead_request *)mem; | |
b89fec54 JK |
1491 | dctx = (struct tls_decrypt_ctx *)(mem + aead_size); |
1492 | sgin = &dctx->sg[0]; | |
1493 | sgout = &dctx->sg[n_sgin]; | |
0b243d00 | 1494 | |
128cfb88 TZ |
1495 | /* For CCM based ciphers, first byte of nonce+iv is a constant */ |
1496 | switch (prot->cipher_type) { | |
1497 | case TLS_CIPHER_AES_CCM_128: | |
b89fec54 | 1498 | dctx->iv[0] = TLS_AES_CCM_IV_B0_BYTE; |
f295b3ae | 1499 | iv_offset = 1; |
128cfb88 TZ |
1500 | break; |
1501 | case TLS_CIPHER_SM4_CCM: | |
b89fec54 | 1502 | dctx->iv[0] = TLS_SM4_CCM_IV_B0_BYTE; |
128cfb88 TZ |
1503 | iv_offset = 1; |
1504 | break; | |
f295b3ae VG |
1505 | } |
1506 | ||
0b243d00 | 1507 | /* Prepare IV */ |
a6acbe62 | 1508 | if (prot->version == TLS_1_3_VERSION || |
a4ae58cd | 1509 | prot->cipher_type == TLS_CIPHER_CHACHA20_POLY1305) { |
b89fec54 | 1510 | memcpy(&dctx->iv[iv_offset], tls_ctx->rx.iv, |
9381fe8c | 1511 | prot->iv_size + prot->salt_size); |
a4ae58cd JK |
1512 | } else { |
1513 | err = skb_copy_bits(skb, rxm->offset + TLS_HEADER_SIZE, | |
b89fec54 | 1514 | &dctx->iv[iv_offset] + prot->salt_size, |
a4ae58cd | 1515 | prot->iv_size); |
03957d84 JK |
1516 | if (err < 0) |
1517 | goto exit_free; | |
b89fec54 | 1518 | memcpy(&dctx->iv[iv_offset], tls_ctx->rx.iv, prot->salt_size); |
a4ae58cd | 1519 | } |
58790314 | 1520 | tls_xor_iv_with_seq(prot, &dctx->iv[iv_offset], tls_ctx->rx.rec_seq); |
0b243d00 VG |
1521 | |
1522 | /* Prepare AAD */ | |
b89fec54 | 1523 | tls_make_aad(dctx->aad, rxm->full_len - prot->overhead_size + |
4509de14 | 1524 | prot->tail_size, |
c3f6bb74 | 1525 | tls_ctx->rx.rec_seq, tlm->control, prot); |
0b243d00 VG |
1526 | |
1527 | /* Prepare sgin */ | |
1528 | sg_init_table(sgin, n_sgin); | |
b89fec54 | 1529 | sg_set_buf(&sgin[0], dctx->aad, prot->aad_size); |
0b243d00 | 1530 | err = skb_to_sgvec(skb, &sgin[1], |
4509de14 VG |
1531 | rxm->offset + prot->prepend_size, |
1532 | rxm->full_len - prot->prepend_size); | |
03957d84 JK |
1533 | if (err < 0) |
1534 | goto exit_free; | |
0b243d00 | 1535 | |
fd31f399 JK |
1536 | if (clear_skb) { |
1537 | sg_init_table(sgout, n_sgout); | |
1538 | sg_set_buf(&sgout[0], dctx->aad, prot->aad_size); | |
1539 | ||
1540 | err = skb_to_sgvec(clear_skb, &sgout[1], prot->prepend_size, | |
1541 | data_len + prot->tail_size); | |
1542 | if (err < 0) | |
1543 | goto exit_free; | |
1544 | } else if (out_iov) { | |
1545 | sg_init_table(sgout, n_sgout); | |
1546 | sg_set_buf(&sgout[0], dctx->aad, prot->aad_size); | |
1547 | ||
1548 | err = tls_setup_from_iter(out_iov, data_len, &pages, &sgout[1], | |
1549 | (n_sgout - 1 - tail_pages)); | |
1550 | if (err < 0) | |
1551 | goto exit_free_pages; | |
1552 | ||
1553 | if (prot->tail_size) { | |
1554 | sg_unmark_end(&sgout[pages]); | |
1555 | sg_set_buf(&sgout[pages + 1], &dctx->tail, | |
1556 | prot->tail_size); | |
1557 | sg_mark_end(&sgout[pages + 1]); | |
0b243d00 | 1558 | } |
fd31f399 JK |
1559 | } else if (out_sg) { |
1560 | memcpy(sgout, out_sg, n_sgout * sizeof(*sgout)); | |
0b243d00 VG |
1561 | } |
1562 | ||
1563 | /* Prepare and submit AEAD request */ | |
6ececdc5 | 1564 | err = tls_do_decryption(sk, sgin, sgout, dctx->iv, |
603380f5 | 1565 | data_len + prot->tail_size, aead_req, darg); |
6bd116c8 JK |
1566 | if (err) |
1567 | goto exit_free_pages; | |
1568 | ||
fd31f399 JK |
1569 | darg->skb = clear_skb ?: tls_strp_msg(ctx); |
1570 | clear_skb = NULL; | |
c618db2a JK |
1571 | |
1572 | if (unlikely(darg->async)) { | |
1573 | err = tls_strp_msg_hold(sk, skb, &ctx->async_hold); | |
1574 | if (err) | |
1575 | __skb_queue_tail(&ctx->async_hold, darg->skb); | |
1576 | return err; | |
1577 | } | |
0b243d00 | 1578 | |
ce61327c | 1579 | if (prot->tail_size) |
b89fec54 | 1580 | darg->tail = dctx->tail; |
ce61327c | 1581 | |
6bd116c8 | 1582 | exit_free_pages: |
0b243d00 VG |
1583 | /* Release the pages in case iov was mapped to pages */ |
1584 | for (; pages > 0; pages--) | |
1585 | put_page(sg_page(&sgout[pages])); | |
03957d84 | 1586 | exit_free: |
0b243d00 | 1587 | kfree(mem); |
fd31f399 JK |
1588 | exit_free_skb: |
1589 | consume_skb(clear_skb); | |
0b243d00 VG |
1590 | return err; |
1591 | } | |
1592 | ||
8a958732 | 1593 | static int |
dd47ed36 JK |
1594 | tls_decrypt_sw(struct sock *sk, struct tls_context *tls_ctx, |
1595 | struct msghdr *msg, struct tls_decrypt_arg *darg) | |
dafb67f3 | 1596 | { |
541cc48b | 1597 | struct tls_sw_context_rx *ctx = tls_sw_ctx_rx(tls_ctx); |
4509de14 | 1598 | struct tls_prot_info *prot = &tls_ctx->prot_info; |
541cc48b | 1599 | struct strp_msg *rxm; |
3764ae5b | 1600 | int pad, err; |
dafb67f3 | 1601 | |
dd47ed36 | 1602 | err = tls_decrypt_sg(sk, &msg->msg_iter, NULL, darg); |
a069a905 GP |
1603 | if (err < 0) { |
1604 | if (err == -EBADMSG) | |
1605 | TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSDECRYPTERROR); | |
3764ae5b | 1606 | return err; |
a069a905 | 1607 | } |
dd47ed36 JK |
1608 | /* keep going even for ->async, the code below is TLS 1.3 */ |
1609 | ||
ce61327c JK |
1610 | /* If opportunistic TLS 1.3 ZC failed retry without ZC */ |
1611 | if (unlikely(darg->zc && prot->version == TLS_1_3_VERSION && | |
1612 | darg->tail != TLS_RECORD_TYPE_DATA)) { | |
1613 | darg->zc = false; | |
bb56cea9 JK |
1614 | if (!darg->tail) |
1615 | TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSRXNOPADVIOL); | |
1090c1ea | 1616 | TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSDECRYPTRETRY); |
dd47ed36 | 1617 | return tls_decrypt_sw(sk, tls_ctx, msg, darg); |
ce61327c | 1618 | } |
dafb67f3 | 1619 | |
6bd116c8 JK |
1620 | pad = tls_padding_length(prot, darg->skb, darg); |
1621 | if (pad < 0) { | |
b93f5700 JK |
1622 | if (darg->skb != tls_strp_msg(ctx)) |
1623 | consume_skb(darg->skb); | |
3764ae5b | 1624 | return pad; |
6bd116c8 | 1625 | } |
3764ae5b | 1626 | |
6bd116c8 | 1627 | rxm = strp_msg(darg->skb); |
3764ae5b | 1628 | rxm->full_len -= pad; |
dd47ed36 JK |
1629 | |
1630 | return 0; | |
1631 | } | |
1632 | ||
1633 | static int | |
1634 | tls_decrypt_device(struct sock *sk, struct tls_context *tls_ctx, | |
1635 | struct tls_decrypt_arg *darg) | |
1636 | { | |
1637 | struct tls_sw_context_rx *ctx = tls_sw_ctx_rx(tls_ctx); | |
1638 | struct tls_prot_info *prot = &tls_ctx->prot_info; | |
1639 | struct strp_msg *rxm; | |
1640 | int pad, err; | |
1641 | ||
1642 | if (tls_ctx->rx_conf != TLS_HW) | |
1643 | return 0; | |
1644 | ||
1645 | err = tls_device_decrypted(sk, tls_ctx); | |
1646 | if (err <= 0) | |
1647 | return err; | |
1648 | ||
1649 | pad = tls_padding_length(prot, tls_strp_msg(ctx), darg); | |
1650 | if (pad < 0) | |
1651 | return pad; | |
1652 | ||
1653 | darg->zc = false; | |
1654 | darg->async = false; | |
1655 | darg->skb = tls_strp_msg(ctx); | |
1656 | ctx->recv_pkt = NULL; | |
1657 | ||
1658 | rxm = strp_msg(darg->skb); | |
1659 | rxm->full_len -= pad; | |
1660 | return 1; | |
1661 | } | |
1662 | ||
1663 | static int tls_rx_one_record(struct sock *sk, struct msghdr *msg, | |
1664 | struct tls_decrypt_arg *darg) | |
1665 | { | |
1666 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
1667 | struct tls_prot_info *prot = &tls_ctx->prot_info; | |
1668 | struct strp_msg *rxm; | |
1669 | int err; | |
1670 | ||
1671 | err = tls_decrypt_device(sk, tls_ctx, darg); | |
1672 | if (!err) | |
1673 | err = tls_decrypt_sw(sk, tls_ctx, msg, darg); | |
1674 | if (err < 0) | |
1675 | return err; | |
1676 | ||
1677 | rxm = strp_msg(darg->skb); | |
3764ae5b JK |
1678 | rxm->offset += prot->prepend_size; |
1679 | rxm->full_len -= prot->overhead_size; | |
3547a1f9 | 1680 | tls_advance_record_sn(sk, prot, &tls_ctx->rx); |
3764ae5b JK |
1681 | |
1682 | return 0; | |
dafb67f3 BP |
1683 | } |
1684 | ||
541cc48b | 1685 | int decrypt_skb(struct sock *sk, struct scatterlist *sgout) |
c46234eb | 1686 | { |
4175eac3 | 1687 | struct tls_decrypt_arg darg = { .zc = true, }; |
c46234eb | 1688 | |
541cc48b | 1689 | return tls_decrypt_sg(sk, NULL, sgout, &darg); |
c46234eb DW |
1690 | } |
1691 | ||
06554f4f JK |
1692 | static int tls_record_content_type(struct msghdr *msg, struct tls_msg *tlm, |
1693 | u8 *control) | |
1694 | { | |
1695 | int err; | |
1696 | ||
1697 | if (!*control) { | |
1698 | *control = tlm->control; | |
1699 | if (!*control) | |
1700 | return -EBADMSG; | |
1701 | ||
1702 | err = put_cmsg(msg, SOL_TLS, TLS_GET_RECORD_TYPE, | |
1703 | sizeof(*control), control); | |
1704 | if (*control != TLS_RECORD_TYPE_DATA) { | |
1705 | if (err || msg->msg_flags & MSG_CTRUNC) | |
1706 | return -EIO; | |
1707 | } | |
1708 | } else if (*control != tlm->control) { | |
1709 | return 0; | |
1710 | } | |
1711 | ||
1712 | return 1; | |
1713 | } | |
1714 | ||
abb47dc9 JK |
1715 | static void tls_rx_rec_done(struct tls_sw_context_rx *ctx) |
1716 | { | |
6bd116c8 | 1717 | consume_skb(ctx->recv_pkt); |
abb47dc9 JK |
1718 | ctx->recv_pkt = NULL; |
1719 | __strp_unpause(&ctx->strp); | |
1720 | } | |
1721 | ||
692d7b5d | 1722 | /* This function traverses the rx_list in tls receive context to copies the |
2b794c40 | 1723 | * decrypted records into the buffer provided by caller zero copy is not |
692d7b5d VG |
1724 | * true. Further, the records are removed from the rx_list if it is not a peek |
1725 | * case and the record has been consumed completely. | |
1726 | */ | |
1727 | static int process_rx_list(struct tls_sw_context_rx *ctx, | |
1728 | struct msghdr *msg, | |
2b794c40 | 1729 | u8 *control, |
692d7b5d VG |
1730 | size_t skip, |
1731 | size_t len, | |
692d7b5d VG |
1732 | bool is_peek) |
1733 | { | |
1734 | struct sk_buff *skb = skb_peek(&ctx->rx_list); | |
2b794c40 | 1735 | struct tls_msg *tlm; |
692d7b5d | 1736 | ssize_t copied = 0; |
06554f4f | 1737 | int err; |
2b794c40 | 1738 | |
692d7b5d VG |
1739 | while (skip && skb) { |
1740 | struct strp_msg *rxm = strp_msg(skb); | |
2b794c40 VG |
1741 | tlm = tls_msg(skb); |
1742 | ||
06554f4f JK |
1743 | err = tls_record_content_type(msg, tlm, control); |
1744 | if (err <= 0) | |
4dcdd971 | 1745 | goto out; |
692d7b5d VG |
1746 | |
1747 | if (skip < rxm->full_len) | |
1748 | break; | |
1749 | ||
1750 | skip = skip - rxm->full_len; | |
1751 | skb = skb_peek_next(skb, &ctx->rx_list); | |
1752 | } | |
1753 | ||
1754 | while (len && skb) { | |
1755 | struct sk_buff *next_skb; | |
1756 | struct strp_msg *rxm = strp_msg(skb); | |
1757 | int chunk = min_t(unsigned int, rxm->full_len - skip, len); | |
1758 | ||
2b794c40 VG |
1759 | tlm = tls_msg(skb); |
1760 | ||
06554f4f JK |
1761 | err = tls_record_content_type(msg, tlm, control); |
1762 | if (err <= 0) | |
4dcdd971 | 1763 | goto out; |
2b794c40 | 1764 | |
cbbdee99 JK |
1765 | err = skb_copy_datagram_msg(skb, rxm->offset + skip, |
1766 | msg, chunk); | |
1767 | if (err < 0) | |
1768 | goto out; | |
692d7b5d VG |
1769 | |
1770 | len = len - chunk; | |
1771 | copied = copied + chunk; | |
1772 | ||
1773 | /* Consume the data from record if it is non-peek case*/ | |
1774 | if (!is_peek) { | |
1775 | rxm->offset = rxm->offset + chunk; | |
1776 | rxm->full_len = rxm->full_len - chunk; | |
1777 | ||
1778 | /* Return if there is unconsumed data in the record */ | |
1779 | if (rxm->full_len - skip) | |
1780 | break; | |
1781 | } | |
1782 | ||
1783 | /* The remaining skip-bytes must lie in 1st record in rx_list. | |
1784 | * So from the 2nd record, 'skip' should be 0. | |
1785 | */ | |
1786 | skip = 0; | |
1787 | ||
1788 | if (msg) | |
1789 | msg->msg_flags |= MSG_EOR; | |
1790 | ||
1791 | next_skb = skb_peek_next(skb, &ctx->rx_list); | |
1792 | ||
1793 | if (!is_peek) { | |
a30295c4 | 1794 | __skb_unlink(skb, &ctx->rx_list); |
a88c26f6 | 1795 | consume_skb(skb); |
692d7b5d VG |
1796 | } |
1797 | ||
1798 | skb = next_skb; | |
1799 | } | |
4dcdd971 | 1800 | err = 0; |
692d7b5d | 1801 | |
4dcdd971 JK |
1802 | out: |
1803 | return copied ? : err; | |
692d7b5d VG |
1804 | } |
1805 | ||
c46b0183 JK |
1806 | static void |
1807 | tls_read_flush_backlog(struct sock *sk, struct tls_prot_info *prot, | |
1808 | size_t len_left, size_t decrypted, ssize_t done, | |
1809 | size_t *flushed_at) | |
1810 | { | |
1811 | size_t max_rec; | |
1812 | ||
1813 | if (len_left <= decrypted) | |
1814 | return; | |
1815 | ||
1816 | max_rec = prot->overhead_size - prot->tail_size + TLS_MAX_PAYLOAD_SIZE; | |
1817 | if (done - *flushed_at < SZ_128K && tcp_inq(sk) > max_rec) | |
1818 | return; | |
1819 | ||
1820 | *flushed_at = done; | |
1821 | sk_flush_backlog(sk); | |
1822 | } | |
1823 | ||
4cbc325e JK |
1824 | static long tls_rx_reader_lock(struct sock *sk, struct tls_sw_context_rx *ctx, |
1825 | bool nonblock) | |
1826 | { | |
1827 | long timeo; | |
dde06aaa | 1828 | int err; |
4cbc325e JK |
1829 | |
1830 | lock_sock(sk); | |
1831 | ||
1832 | timeo = sock_rcvtimeo(sk, nonblock); | |
1833 | ||
1834 | while (unlikely(ctx->reader_present)) { | |
1835 | DEFINE_WAIT_FUNC(wait, woken_wake_function); | |
1836 | ||
1837 | ctx->reader_contended = 1; | |
1838 | ||
1839 | add_wait_queue(&ctx->wq, &wait); | |
1840 | sk_wait_event(sk, &timeo, | |
1841 | !READ_ONCE(ctx->reader_present), &wait); | |
1842 | remove_wait_queue(&ctx->wq, &wait); | |
1843 | ||
dde06aaa JK |
1844 | if (timeo <= 0) { |
1845 | err = -EAGAIN; | |
1846 | goto err_unlock; | |
1847 | } | |
1848 | if (signal_pending(current)) { | |
1849 | err = sock_intr_errno(timeo); | |
1850 | goto err_unlock; | |
1851 | } | |
4cbc325e JK |
1852 | } |
1853 | ||
1854 | WRITE_ONCE(ctx->reader_present, 1); | |
1855 | ||
1856 | return timeo; | |
dde06aaa JK |
1857 | |
1858 | err_unlock: | |
1859 | release_sock(sk); | |
1860 | return err; | |
4cbc325e JK |
1861 | } |
1862 | ||
1863 | static void tls_rx_reader_unlock(struct sock *sk, struct tls_sw_context_rx *ctx) | |
1864 | { | |
1865 | if (unlikely(ctx->reader_contended)) { | |
1866 | if (wq_has_sleeper(&ctx->wq)) | |
1867 | wake_up(&ctx->wq); | |
1868 | else | |
1869 | ctx->reader_contended = 0; | |
1870 | ||
1871 | WARN_ON_ONCE(!ctx->reader_present); | |
1872 | } | |
1873 | ||
1874 | WRITE_ONCE(ctx->reader_present, 0); | |
1875 | release_sock(sk); | |
1876 | } | |
1877 | ||
c46234eb DW |
1878 | int tls_sw_recvmsg(struct sock *sk, |
1879 | struct msghdr *msg, | |
1880 | size_t len, | |
c46234eb DW |
1881 | int flags, |
1882 | int *addr_len) | |
1883 | { | |
1884 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
f66de3ee | 1885 | struct tls_sw_context_rx *ctx = tls_sw_ctx_rx(tls_ctx); |
4509de14 | 1886 | struct tls_prot_info *prot = &tls_ctx->prot_info; |
cbbdee99 | 1887 | ssize_t decrypted = 0, async_copy_bytes = 0; |
d3b18ad3 | 1888 | struct sk_psock *psock; |
692d7b5d | 1889 | unsigned char control = 0; |
c46b0183 | 1890 | size_t flushed_at = 0; |
c46234eb | 1891 | struct strp_msg *rxm; |
2b794c40 | 1892 | struct tls_msg *tlm; |
c46234eb | 1893 | ssize_t copied = 0; |
7da18bcc | 1894 | bool async = false; |
06030dba | 1895 | int target, err = 0; |
c46234eb | 1896 | long timeo; |
00e23707 | 1897 | bool is_kvec = iov_iter_is_kvec(&msg->msg_iter); |
692d7b5d | 1898 | bool is_peek = flags & MSG_PEEK; |
e91de6af | 1899 | bool bpf_strp_enabled; |
ba13609d | 1900 | bool zc_capable; |
c46234eb | 1901 | |
c46234eb DW |
1902 | if (unlikely(flags & MSG_ERRQUEUE)) |
1903 | return sock_recv_errqueue(sk, msg, len, SOL_IP, IP_RECVERR); | |
1904 | ||
d3b18ad3 | 1905 | psock = sk_psock_get(sk); |
4cbc325e JK |
1906 | timeo = tls_rx_reader_lock(sk, ctx, flags & MSG_DONTWAIT); |
1907 | if (timeo < 0) | |
1908 | return timeo; | |
e91de6af | 1909 | bpf_strp_enabled = sk_psock_strp_enabled(psock); |
c46234eb | 1910 | |
f314bfee JK |
1911 | /* If crypto failed the connection is broken */ |
1912 | err = ctx->async_wait.err; | |
1913 | if (err) | |
1914 | goto end; | |
1915 | ||
692d7b5d | 1916 | /* Process pending decrypted records. It must be non-zero-copy */ |
cbbdee99 | 1917 | err = process_rx_list(ctx, msg, &control, 0, len, is_peek); |
4dcdd971 | 1918 | if (err < 0) |
692d7b5d | 1919 | goto end; |
692d7b5d | 1920 | |
d5123edd | 1921 | copied = err; |
46a16959 | 1922 | if (len <= copied) |
bfc06e1a | 1923 | goto end; |
46a16959 JK |
1924 | |
1925 | target = sock_rcvlowat(sk, flags & MSG_WAITALL, len); | |
1926 | len = len - copied; | |
692d7b5d | 1927 | |
ba13609d | 1928 | zc_capable = !bpf_strp_enabled && !is_kvec && !is_peek && |
88527790 | 1929 | ctx->zc_capable; |
bfc06e1a | 1930 | decrypted = 0; |
b92a13d4 | 1931 | while (len && (decrypted + copied < target || tls_strp_msg_ready(ctx))) { |
6bd116c8 | 1932 | struct tls_decrypt_arg darg; |
9bdf75cc | 1933 | int to_decrypt, chunk; |
c46234eb | 1934 | |
35560b7f JK |
1935 | err = tls_rx_rec_wait(sk, psock, flags & MSG_DONTWAIT, timeo); |
1936 | if (err <= 0) { | |
d3b18ad3 | 1937 | if (psock) { |
0775639c JK |
1938 | chunk = sk_msg_recvmsg(sk, psock, msg, len, |
1939 | flags); | |
008141de JK |
1940 | if (chunk > 0) { |
1941 | decrypted += chunk; | |
1942 | len -= chunk; | |
1943 | continue; | |
1944 | } | |
d3b18ad3 | 1945 | } |
c46234eb | 1946 | goto recv_end; |
d3b18ad3 | 1947 | } |
c46234eb | 1948 | |
6bd116c8 JK |
1949 | memset(&darg.inargs, 0, sizeof(darg.inargs)); |
1950 | ||
1951 | rxm = strp_msg(ctx->recv_pkt); | |
1952 | tlm = tls_msg(ctx->recv_pkt); | |
94524d8f | 1953 | |
4509de14 | 1954 | to_decrypt = rxm->full_len - prot->overhead_size; |
fedf201e | 1955 | |
ba13609d JK |
1956 | if (zc_capable && to_decrypt <= len && |
1957 | tlm->control == TLS_RECORD_TYPE_DATA) | |
4175eac3 | 1958 | darg.zc = true; |
fedf201e | 1959 | |
c0ab4732 | 1960 | /* Do not use async mode if record is non-data */ |
c3f6bb74 | 1961 | if (tlm->control == TLS_RECORD_TYPE_DATA && !bpf_strp_enabled) |
4175eac3 | 1962 | darg.async = ctx->async_capable; |
c0ab4732 | 1963 | else |
4175eac3 | 1964 | darg.async = false; |
c0ab4732 | 1965 | |
dd47ed36 | 1966 | err = tls_rx_one_record(sk, msg, &darg); |
3547a1f9 | 1967 | if (err < 0) { |
da353fac | 1968 | tls_err_abort(sk, -EBADMSG); |
fedf201e DW |
1969 | goto recv_end; |
1970 | } | |
1971 | ||
3547a1f9 | 1972 | async |= darg.async; |
2b794c40 VG |
1973 | |
1974 | /* If the type of records being processed is not known yet, | |
1975 | * set it to record type just dequeued. If it is already known, | |
1976 | * but does not match the record type just dequeued, go to end. | |
1977 | * We always get record type here since for tls1.2, record type | |
1978 | * is known just after record is dequeued from stream parser. | |
1979 | * For tls1.3, we disable async. | |
1980 | */ | |
b93f5700 | 1981 | err = tls_record_content_type(msg, tls_msg(darg.skb), &control); |
abb47dc9 | 1982 | if (err <= 0) { |
b93f5700 | 1983 | DEBUG_NET_WARN_ON_ONCE(darg.zc); |
abb47dc9 JK |
1984 | tls_rx_rec_done(ctx); |
1985 | put_on_rx_list_err: | |
b93f5700 | 1986 | __skb_queue_tail(&ctx->rx_list, darg.skb); |
2b794c40 | 1987 | goto recv_end; |
abb47dc9 | 1988 | } |
fedf201e | 1989 | |
c46b0183 JK |
1990 | /* periodically flush backlog, and feed strparser */ |
1991 | tls_read_flush_backlog(sk, prot, len, to_decrypt, | |
1992 | decrypted + copied, &flushed_at); | |
1993 | ||
abb47dc9 | 1994 | /* TLS 1.3 may have updated the length by more than overhead */ |
b93f5700 | 1995 | rxm = strp_msg(darg.skb); |
abb47dc9 JK |
1996 | chunk = rxm->full_len; |
1997 | tls_rx_rec_done(ctx); | |
b1a2c178 | 1998 | |
4175eac3 | 1999 | if (!darg.zc) { |
f940b6ef | 2000 | bool partially_consumed = chunk > len; |
b93f5700 JK |
2001 | struct sk_buff *skb = darg.skb; |
2002 | ||
2003 | DEBUG_NET_WARN_ON_ONCE(darg.skb == ctx->recv_pkt); | |
f940b6ef | 2004 | |
cbbdee99 JK |
2005 | if (async) { |
2006 | /* TLS 1.2-only, to_decrypt must be text len */ | |
2007 | chunk = min_t(int, to_decrypt, len); | |
2008 | async_copy_bytes += chunk; | |
2009 | put_on_rx_list: | |
2010 | decrypted += chunk; | |
2011 | len -= chunk; | |
2012 | __skb_queue_tail(&ctx->rx_list, skb); | |
2013 | continue; | |
2014 | } | |
2015 | ||
e91de6af JF |
2016 | if (bpf_strp_enabled) { |
2017 | err = sk_psock_tls_strp_read(psock, skb); | |
2018 | if (err != __SK_PASS) { | |
2019 | rxm->offset = rxm->offset + rxm->full_len; | |
2020 | rxm->full_len = 0; | |
2021 | if (err == __SK_DROP) | |
2022 | consume_skb(skb); | |
e91de6af JF |
2023 | continue; |
2024 | } | |
2025 | } | |
2026 | ||
f940b6ef | 2027 | if (partially_consumed) |
fedf201e | 2028 | chunk = len; |
692d7b5d | 2029 | |
fedf201e DW |
2030 | err = skb_copy_datagram_msg(skb, rxm->offset, |
2031 | msg, chunk); | |
abb47dc9 JK |
2032 | if (err < 0) |
2033 | goto put_on_rx_list_err; | |
94524d8f | 2034 | |
f940b6ef | 2035 | if (is_peek) |
008141de | 2036 | goto put_on_rx_list; |
f940b6ef JK |
2037 | |
2038 | if (partially_consumed) { | |
2039 | rxm->offset += chunk; | |
2040 | rxm->full_len -= chunk; | |
008141de | 2041 | goto put_on_rx_list; |
692d7b5d | 2042 | } |
b93f5700 JK |
2043 | |
2044 | consume_skb(skb); | |
c46234eb DW |
2045 | } |
2046 | ||
692d7b5d | 2047 | decrypted += chunk; |
c46234eb | 2048 | len -= chunk; |
692d7b5d | 2049 | |
f940b6ef JK |
2050 | /* Return full control message to userspace before trying |
2051 | * to parse another message type | |
2052 | */ | |
2053 | msg->msg_flags |= MSG_EOR; | |
2054 | if (control != TLS_RECORD_TYPE_DATA) | |
2055 | break; | |
04b25a54 | 2056 | } |
c46234eb DW |
2057 | |
2058 | recv_end: | |
7da18bcc | 2059 | if (async) { |
f314bfee | 2060 | int ret, pending; |
7da18bcc | 2061 | |
94524d8f | 2062 | /* Wait for all previously submitted records to be decrypted */ |
0cada332 | 2063 | spin_lock_bh(&ctx->decrypt_compl_lock); |
37943f04 | 2064 | reinit_completion(&ctx->async_wait.completion); |
0cada332 VKY |
2065 | pending = atomic_read(&ctx->decrypt_pending); |
2066 | spin_unlock_bh(&ctx->decrypt_compl_lock); | |
c618db2a JK |
2067 | ret = 0; |
2068 | if (pending) | |
f314bfee | 2069 | ret = crypto_wait_req(-EINPROGRESS, &ctx->async_wait); |
c618db2a JK |
2070 | __skb_queue_purge(&ctx->async_hold); |
2071 | ||
2072 | if (ret) { | |
2073 | if (err >= 0 || err == -EINPROGRESS) | |
2074 | err = ret; | |
2075 | decrypted = 0; | |
2076 | goto end; | |
94524d8f | 2077 | } |
0cada332 | 2078 | |
692d7b5d VG |
2079 | /* Drain records from the rx_list & copy if required */ |
2080 | if (is_peek || is_kvec) | |
06554f4f | 2081 | err = process_rx_list(ctx, msg, &control, copied, |
cbbdee99 | 2082 | decrypted, is_peek); |
692d7b5d | 2083 | else |
06554f4f | 2084 | err = process_rx_list(ctx, msg, &control, 0, |
cbbdee99 | 2085 | async_copy_bytes, is_peek); |
4dcdd971 | 2086 | decrypted = max(err, 0); |
94524d8f VG |
2087 | } |
2088 | ||
692d7b5d VG |
2089 | copied += decrypted; |
2090 | ||
2091 | end: | |
4cbc325e | 2092 | tls_rx_reader_unlock(sk, ctx); |
d3b18ad3 JF |
2093 | if (psock) |
2094 | sk_psock_put(sk, psock); | |
c46234eb DW |
2095 | return copied ? : err; |
2096 | } | |
2097 | ||
2098 | ssize_t tls_sw_splice_read(struct socket *sock, loff_t *ppos, | |
2099 | struct pipe_inode_info *pipe, | |
2100 | size_t len, unsigned int flags) | |
2101 | { | |
2102 | struct tls_context *tls_ctx = tls_get_ctx(sock->sk); | |
f66de3ee | 2103 | struct tls_sw_context_rx *ctx = tls_sw_ctx_rx(tls_ctx); |
c46234eb DW |
2104 | struct strp_msg *rxm = NULL; |
2105 | struct sock *sk = sock->sk; | |
c3f6bb74 | 2106 | struct tls_msg *tlm; |
c46234eb DW |
2107 | struct sk_buff *skb; |
2108 | ssize_t copied = 0; | |
2109 | int err = 0; | |
2110 | long timeo; | |
2111 | int chunk; | |
2112 | ||
4cbc325e JK |
2113 | timeo = tls_rx_reader_lock(sk, ctx, flags & SPLICE_F_NONBLOCK); |
2114 | if (timeo < 0) | |
2115 | return timeo; | |
c46234eb | 2116 | |
abb47dc9 | 2117 | if (!skb_queue_empty(&ctx->rx_list)) { |
e062fe99 JK |
2118 | skb = __skb_dequeue(&ctx->rx_list); |
2119 | } else { | |
6bd116c8 | 2120 | struct tls_decrypt_arg darg; |
4175eac3 | 2121 | |
35560b7f JK |
2122 | err = tls_rx_rec_wait(sk, NULL, flags & SPLICE_F_NONBLOCK, |
2123 | timeo); | |
2124 | if (err <= 0) | |
e062fe99 | 2125 | goto splice_read_end; |
c46234eb | 2126 | |
6bd116c8 JK |
2127 | memset(&darg.inargs, 0, sizeof(darg.inargs)); |
2128 | ||
541cc48b | 2129 | err = tls_rx_one_record(sk, NULL, &darg); |
e062fe99 JK |
2130 | if (err < 0) { |
2131 | tls_err_abort(sk, -EBADMSG); | |
2132 | goto splice_read_end; | |
2133 | } | |
abb47dc9 JK |
2134 | |
2135 | tls_rx_rec_done(ctx); | |
6bd116c8 | 2136 | skb = darg.skb; |
520493f6 | 2137 | } |
fedf201e | 2138 | |
c3f6bb74 JK |
2139 | rxm = strp_msg(skb); |
2140 | tlm = tls_msg(skb); | |
2141 | ||
520493f6 | 2142 | /* splice does not support reading control messages */ |
c3f6bb74 | 2143 | if (tlm->control != TLS_RECORD_TYPE_DATA) { |
520493f6 | 2144 | err = -EINVAL; |
abb47dc9 | 2145 | goto splice_requeue; |
c46234eb | 2146 | } |
520493f6 | 2147 | |
c46234eb DW |
2148 | chunk = min_t(unsigned int, rxm->full_len, len); |
2149 | copied = skb_splice_bits(skb, sk, rxm->offset, pipe, chunk, flags); | |
2150 | if (copied < 0) | |
abb47dc9 | 2151 | goto splice_requeue; |
c46234eb | 2152 | |
e062fe99 | 2153 | if (chunk < rxm->full_len) { |
e062fe99 JK |
2154 | rxm->offset += len; |
2155 | rxm->full_len -= len; | |
abb47dc9 | 2156 | goto splice_requeue; |
e062fe99 | 2157 | } |
c46234eb | 2158 | |
abb47dc9 JK |
2159 | consume_skb(skb); |
2160 | ||
c46234eb | 2161 | splice_read_end: |
4cbc325e | 2162 | tls_rx_reader_unlock(sk, ctx); |
c46234eb | 2163 | return copied ? : err; |
abb47dc9 JK |
2164 | |
2165 | splice_requeue: | |
2166 | __skb_queue_head(&ctx->rx_list, skb); | |
2167 | goto splice_read_end; | |
c46234eb DW |
2168 | } |
2169 | ||
7b50ecfc | 2170 | bool tls_sw_sock_is_readable(struct sock *sk) |
c46234eb | 2171 | { |
c46234eb | 2172 | struct tls_context *tls_ctx = tls_get_ctx(sk); |
f66de3ee | 2173 | struct tls_sw_context_rx *ctx = tls_sw_ctx_rx(tls_ctx); |
d3b18ad3 JF |
2174 | bool ingress_empty = true; |
2175 | struct sk_psock *psock; | |
c46234eb | 2176 | |
d3b18ad3 JF |
2177 | rcu_read_lock(); |
2178 | psock = sk_psock(sk); | |
2179 | if (psock) | |
2180 | ingress_empty = list_empty(&psock->ingress_msg); | |
2181 | rcu_read_unlock(); | |
c46234eb | 2182 | |
b92a13d4 | 2183 | return !ingress_empty || tls_strp_msg_ready(ctx) || |
13aecb17 | 2184 | !skb_queue_empty(&ctx->rx_list); |
c46234eb DW |
2185 | } |
2186 | ||
2187 | static int tls_read_size(struct strparser *strp, struct sk_buff *skb) | |
2188 | { | |
2189 | struct tls_context *tls_ctx = tls_get_ctx(strp->sk); | |
4509de14 | 2190 | struct tls_prot_info *prot = &tls_ctx->prot_info; |
3463e51d | 2191 | char header[TLS_HEADER_SIZE + MAX_IV_SIZE]; |
c46234eb | 2192 | struct strp_msg *rxm = strp_msg(skb); |
c3f6bb74 | 2193 | struct tls_msg *tlm = tls_msg(skb); |
c46234eb DW |
2194 | size_t cipher_overhead; |
2195 | size_t data_len = 0; | |
2196 | int ret; | |
2197 | ||
2198 | /* Verify that we have a full TLS header, or wait for more data */ | |
4509de14 | 2199 | if (rxm->offset + prot->prepend_size > skb->len) |
c46234eb DW |
2200 | return 0; |
2201 | ||
3463e51d | 2202 | /* Sanity-check size of on-stack buffer. */ |
4509de14 | 2203 | if (WARN_ON(prot->prepend_size > sizeof(header))) { |
3463e51d KC |
2204 | ret = -EINVAL; |
2205 | goto read_failure; | |
2206 | } | |
2207 | ||
c46234eb | 2208 | /* Linearize header to local buffer */ |
4509de14 | 2209 | ret = skb_copy_bits(skb, rxm->offset, header, prot->prepend_size); |
c46234eb DW |
2210 | if (ret < 0) |
2211 | goto read_failure; | |
2212 | ||
c3f6bb74 | 2213 | tlm->control = header[0]; |
c46234eb DW |
2214 | |
2215 | data_len = ((header[4] & 0xFF) | (header[3] << 8)); | |
2216 | ||
4509de14 | 2217 | cipher_overhead = prot->tag_size; |
a6acbe62 VF |
2218 | if (prot->version != TLS_1_3_VERSION && |
2219 | prot->cipher_type != TLS_CIPHER_CHACHA20_POLY1305) | |
4509de14 | 2220 | cipher_overhead += prot->iv_size; |
c46234eb | 2221 | |
130b392c | 2222 | if (data_len > TLS_MAX_PAYLOAD_SIZE + cipher_overhead + |
4509de14 | 2223 | prot->tail_size) { |
c46234eb DW |
2224 | ret = -EMSGSIZE; |
2225 | goto read_failure; | |
2226 | } | |
2227 | if (data_len < cipher_overhead) { | |
2228 | ret = -EBADMSG; | |
2229 | goto read_failure; | |
2230 | } | |
2231 | ||
130b392c DW |
2232 | /* Note that both TLS1.3 and TLS1.2 use TLS_1_2 version here */ |
2233 | if (header[1] != TLS_1_2_VERSION_MINOR || | |
2234 | header[2] != TLS_1_2_VERSION_MAJOR) { | |
c46234eb DW |
2235 | ret = -EINVAL; |
2236 | goto read_failure; | |
2237 | } | |
be2fbc15 | 2238 | |
f953d33b | 2239 | tls_device_rx_resync_new_rec(strp->sk, data_len + TLS_HEADER_SIZE, |
fe58a5a0 | 2240 | TCP_SKB_CB(skb)->seq + rxm->offset); |
c46234eb DW |
2241 | return data_len + TLS_HEADER_SIZE; |
2242 | ||
2243 | read_failure: | |
2244 | tls_err_abort(strp->sk, ret); | |
2245 | ||
2246 | return ret; | |
2247 | } | |
2248 | ||
2249 | static void tls_queue(struct strparser *strp, struct sk_buff *skb) | |
2250 | { | |
2251 | struct tls_context *tls_ctx = tls_get_ctx(strp->sk); | |
f66de3ee | 2252 | struct tls_sw_context_rx *ctx = tls_sw_ctx_rx(tls_ctx); |
c46234eb DW |
2253 | |
2254 | ctx->recv_pkt = skb; | |
2255 | strp_pause(strp); | |
2256 | ||
ad13acce | 2257 | ctx->saved_data_ready(strp->sk); |
c46234eb DW |
2258 | } |
2259 | ||
2260 | static void tls_data_ready(struct sock *sk) | |
2261 | { | |
2262 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
f66de3ee | 2263 | struct tls_sw_context_rx *ctx = tls_sw_ctx_rx(tls_ctx); |
d3b18ad3 | 2264 | struct sk_psock *psock; |
c46234eb DW |
2265 | |
2266 | strp_data_ready(&ctx->strp); | |
d3b18ad3 JF |
2267 | |
2268 | psock = sk_psock_get(sk); | |
62b4011f XY |
2269 | if (psock) { |
2270 | if (!list_empty(&psock->ingress_msg)) | |
2271 | ctx->saved_data_ready(sk); | |
d3b18ad3 JF |
2272 | sk_psock_put(sk, psock); |
2273 | } | |
c46234eb DW |
2274 | } |
2275 | ||
f87e62d4 JF |
2276 | void tls_sw_cancel_work_tx(struct tls_context *tls_ctx) |
2277 | { | |
2278 | struct tls_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx); | |
2279 | ||
2280 | set_bit(BIT_TX_CLOSING, &ctx->tx_bitmask); | |
2281 | set_bit(BIT_TX_SCHEDULED, &ctx->tx_bitmask); | |
2282 | cancel_delayed_work_sync(&ctx->tx_work.work); | |
2283 | } | |
2284 | ||
313ab004 | 2285 | void tls_sw_release_resources_tx(struct sock *sk) |
3c4d7559 DW |
2286 | { |
2287 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
f66de3ee | 2288 | struct tls_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx); |
a42055e8 | 2289 | struct tls_rec *rec, *tmp; |
38f7e1c0 | 2290 | int pending; |
a42055e8 VG |
2291 | |
2292 | /* Wait for any pending async encryptions to complete */ | |
38f7e1c0 RM |
2293 | spin_lock_bh(&ctx->encrypt_compl_lock); |
2294 | ctx->async_notify = true; | |
2295 | pending = atomic_read(&ctx->encrypt_pending); | |
2296 | spin_unlock_bh(&ctx->encrypt_compl_lock); | |
2297 | ||
2298 | if (pending) | |
a42055e8 VG |
2299 | crypto_wait_req(-EINPROGRESS, &ctx->async_wait); |
2300 | ||
a42055e8 VG |
2301 | tls_tx_records(sk, -1); |
2302 | ||
9932a29a | 2303 | /* Free up un-sent records in tx_list. First, free |
a42055e8 VG |
2304 | * the partially sent record if any at head of tx_list. |
2305 | */ | |
c5daa6cc JK |
2306 | if (tls_ctx->partially_sent_record) { |
2307 | tls_free_partial_record(sk, tls_ctx); | |
9932a29a | 2308 | rec = list_first_entry(&ctx->tx_list, |
a42055e8 VG |
2309 | struct tls_rec, list); |
2310 | list_del(&rec->list); | |
d829e9c4 | 2311 | sk_msg_free(sk, &rec->msg_plaintext); |
a42055e8 VG |
2312 | kfree(rec); |
2313 | } | |
2314 | ||
9932a29a | 2315 | list_for_each_entry_safe(rec, tmp, &ctx->tx_list, list) { |
a42055e8 | 2316 | list_del(&rec->list); |
d829e9c4 DB |
2317 | sk_msg_free(sk, &rec->msg_encrypted); |
2318 | sk_msg_free(sk, &rec->msg_plaintext); | |
a42055e8 VG |
2319 | kfree(rec); |
2320 | } | |
3c4d7559 | 2321 | |
201876b3 | 2322 | crypto_free_aead(ctx->aead_send); |
c774973e | 2323 | tls_free_open_rec(sk); |
313ab004 JF |
2324 | } |
2325 | ||
2326 | void tls_sw_free_ctx_tx(struct tls_context *tls_ctx) | |
2327 | { | |
2328 | struct tls_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx); | |
f66de3ee BP |
2329 | |
2330 | kfree(ctx); | |
2331 | } | |
2332 | ||
39f56e1a | 2333 | void tls_sw_release_resources_rx(struct sock *sk) |
f66de3ee BP |
2334 | { |
2335 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
2336 | struct tls_sw_context_rx *ctx = tls_sw_ctx_rx(tls_ctx); | |
2337 | ||
12c76861 JK |
2338 | kfree(tls_ctx->rx.rec_seq); |
2339 | kfree(tls_ctx->rx.iv); | |
2340 | ||
c46234eb | 2341 | if (ctx->aead_recv) { |
201876b3 VG |
2342 | kfree_skb(ctx->recv_pkt); |
2343 | ctx->recv_pkt = NULL; | |
a30295c4 | 2344 | __skb_queue_purge(&ctx->rx_list); |
c46234eb DW |
2345 | crypto_free_aead(ctx->aead_recv); |
2346 | strp_stop(&ctx->strp); | |
313ab004 JF |
2347 | /* If tls_sw_strparser_arm() was not called (cleanup paths) |
2348 | * we still want to strp_stop(), but sk->sk_data_ready was | |
2349 | * never swapped. | |
2350 | */ | |
2351 | if (ctx->saved_data_ready) { | |
2352 | write_lock_bh(&sk->sk_callback_lock); | |
2353 | sk->sk_data_ready = ctx->saved_data_ready; | |
2354 | write_unlock_bh(&sk->sk_callback_lock); | |
2355 | } | |
c46234eb | 2356 | } |
39f56e1a BP |
2357 | } |
2358 | ||
313ab004 | 2359 | void tls_sw_strparser_done(struct tls_context *tls_ctx) |
39f56e1a | 2360 | { |
39f56e1a BP |
2361 | struct tls_sw_context_rx *ctx = tls_sw_ctx_rx(tls_ctx); |
2362 | ||
313ab004 JF |
2363 | strp_done(&ctx->strp); |
2364 | } | |
2365 | ||
2366 | void tls_sw_free_ctx_rx(struct tls_context *tls_ctx) | |
2367 | { | |
2368 | struct tls_sw_context_rx *ctx = tls_sw_ctx_rx(tls_ctx); | |
3c4d7559 | 2369 | |
3c4d7559 DW |
2370 | kfree(ctx); |
2371 | } | |
2372 | ||
313ab004 JF |
2373 | void tls_sw_free_resources_rx(struct sock *sk) |
2374 | { | |
2375 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
2376 | ||
2377 | tls_sw_release_resources_rx(sk); | |
2378 | tls_sw_free_ctx_rx(tls_ctx); | |
2379 | } | |
2380 | ||
9932a29a | 2381 | /* The work handler to transmitt the encrypted records in tx_list */ |
a42055e8 VG |
2382 | static void tx_work_handler(struct work_struct *work) |
2383 | { | |
2384 | struct delayed_work *delayed_work = to_delayed_work(work); | |
2385 | struct tx_work *tx_work = container_of(delayed_work, | |
2386 | struct tx_work, work); | |
2387 | struct sock *sk = tx_work->sk; | |
2388 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
f87e62d4 | 2389 | struct tls_sw_context_tx *ctx; |
a42055e8 | 2390 | |
f87e62d4 | 2391 | if (unlikely(!tls_ctx)) |
a42055e8 VG |
2392 | return; |
2393 | ||
f87e62d4 JF |
2394 | ctx = tls_sw_ctx_tx(tls_ctx); |
2395 | if (test_bit(BIT_TX_CLOSING, &ctx->tx_bitmask)) | |
2396 | return; | |
2397 | ||
2398 | if (!test_and_clear_bit(BIT_TX_SCHEDULED, &ctx->tx_bitmask)) | |
2399 | return; | |
79ffe608 | 2400 | mutex_lock(&tls_ctx->tx_lock); |
a42055e8 VG |
2401 | lock_sock(sk); |
2402 | tls_tx_records(sk, -1); | |
2403 | release_sock(sk); | |
79ffe608 | 2404 | mutex_unlock(&tls_ctx->tx_lock); |
a42055e8 VG |
2405 | } |
2406 | ||
58790314 JK |
2407 | static bool tls_is_tx_ready(struct tls_sw_context_tx *ctx) |
2408 | { | |
2409 | struct tls_rec *rec; | |
2410 | ||
2411 | rec = list_first_entry(&ctx->tx_list, struct tls_rec, list); | |
2412 | if (!rec) | |
2413 | return false; | |
2414 | ||
2415 | return READ_ONCE(rec->tx_ready); | |
2416 | } | |
2417 | ||
7463d3a2 BP |
2418 | void tls_sw_write_space(struct sock *sk, struct tls_context *ctx) |
2419 | { | |
2420 | struct tls_sw_context_tx *tx_ctx = tls_sw_ctx_tx(ctx); | |
2421 | ||
2422 | /* Schedule the transmission if tx list is ready */ | |
58790314 | 2423 | if (tls_is_tx_ready(tx_ctx) && |
02b1fa07 JK |
2424 | !test_and_set_bit(BIT_TX_SCHEDULED, &tx_ctx->tx_bitmask)) |
2425 | schedule_delayed_work(&tx_ctx->tx_work.work, 0); | |
7463d3a2 BP |
2426 | } |
2427 | ||
318892ac JK |
2428 | void tls_sw_strparser_arm(struct sock *sk, struct tls_context *tls_ctx) |
2429 | { | |
2430 | struct tls_sw_context_rx *rx_ctx = tls_sw_ctx_rx(tls_ctx); | |
2431 | ||
2432 | write_lock_bh(&sk->sk_callback_lock); | |
2433 | rx_ctx->saved_data_ready = sk->sk_data_ready; | |
2434 | sk->sk_data_ready = tls_data_ready; | |
2435 | write_unlock_bh(&sk->sk_callback_lock); | |
2436 | ||
2437 | strp_check_rcv(&rx_ctx->strp); | |
2438 | } | |
2439 | ||
88527790 JK |
2440 | void tls_update_rx_zc_capable(struct tls_context *tls_ctx) |
2441 | { | |
2442 | struct tls_sw_context_rx *rx_ctx = tls_sw_ctx_rx(tls_ctx); | |
2443 | ||
2444 | rx_ctx->zc_capable = tls_ctx->rx_no_pad || | |
2445 | tls_ctx->prot_info.version != TLS_1_3_VERSION; | |
2446 | } | |
2447 | ||
c46234eb | 2448 | int tls_set_sw_offload(struct sock *sk, struct tls_context *ctx, int tx) |
3c4d7559 | 2449 | { |
4509de14 VG |
2450 | struct tls_context *tls_ctx = tls_get_ctx(sk); |
2451 | struct tls_prot_info *prot = &tls_ctx->prot_info; | |
3c4d7559 | 2452 | struct tls_crypto_info *crypto_info; |
f66de3ee BP |
2453 | struct tls_sw_context_tx *sw_ctx_tx = NULL; |
2454 | struct tls_sw_context_rx *sw_ctx_rx = NULL; | |
c46234eb DW |
2455 | struct cipher_context *cctx; |
2456 | struct crypto_aead **aead; | |
2457 | struct strp_callbacks cb; | |
f295b3ae | 2458 | u16 nonce_size, tag_size, iv_size, rec_seq_size, salt_size; |
692d7b5d | 2459 | struct crypto_tfm *tfm; |
f295b3ae | 2460 | char *iv, *rec_seq, *key, *salt, *cipher_name; |
fb99bce7 | 2461 | size_t keysize; |
3c4d7559 DW |
2462 | int rc = 0; |
2463 | ||
2464 | if (!ctx) { | |
2465 | rc = -EINVAL; | |
2466 | goto out; | |
2467 | } | |
2468 | ||
f66de3ee | 2469 | if (tx) { |
b190a587 BP |
2470 | if (!ctx->priv_ctx_tx) { |
2471 | sw_ctx_tx = kzalloc(sizeof(*sw_ctx_tx), GFP_KERNEL); | |
2472 | if (!sw_ctx_tx) { | |
2473 | rc = -ENOMEM; | |
2474 | goto out; | |
2475 | } | |
2476 | ctx->priv_ctx_tx = sw_ctx_tx; | |
2477 | } else { | |
2478 | sw_ctx_tx = | |
2479 | (struct tls_sw_context_tx *)ctx->priv_ctx_tx; | |
c46234eb | 2480 | } |
c46234eb | 2481 | } else { |
b190a587 BP |
2482 | if (!ctx->priv_ctx_rx) { |
2483 | sw_ctx_rx = kzalloc(sizeof(*sw_ctx_rx), GFP_KERNEL); | |
2484 | if (!sw_ctx_rx) { | |
2485 | rc = -ENOMEM; | |
2486 | goto out; | |
2487 | } | |
2488 | ctx->priv_ctx_rx = sw_ctx_rx; | |
2489 | } else { | |
2490 | sw_ctx_rx = | |
2491 | (struct tls_sw_context_rx *)ctx->priv_ctx_rx; | |
f66de3ee | 2492 | } |
3c4d7559 DW |
2493 | } |
2494 | ||
c46234eb | 2495 | if (tx) { |
b190a587 | 2496 | crypto_init_wait(&sw_ctx_tx->async_wait); |
0cada332 | 2497 | spin_lock_init(&sw_ctx_tx->encrypt_compl_lock); |
86029d10 | 2498 | crypto_info = &ctx->crypto_send.info; |
c46234eb | 2499 | cctx = &ctx->tx; |
f66de3ee | 2500 | aead = &sw_ctx_tx->aead_send; |
9932a29a | 2501 | INIT_LIST_HEAD(&sw_ctx_tx->tx_list); |
a42055e8 VG |
2502 | INIT_DELAYED_WORK(&sw_ctx_tx->tx_work.work, tx_work_handler); |
2503 | sw_ctx_tx->tx_work.sk = sk; | |
c46234eb | 2504 | } else { |
b190a587 | 2505 | crypto_init_wait(&sw_ctx_rx->async_wait); |
0cada332 | 2506 | spin_lock_init(&sw_ctx_rx->decrypt_compl_lock); |
4cbc325e | 2507 | init_waitqueue_head(&sw_ctx_rx->wq); |
86029d10 | 2508 | crypto_info = &ctx->crypto_recv.info; |
c46234eb | 2509 | cctx = &ctx->rx; |
692d7b5d | 2510 | skb_queue_head_init(&sw_ctx_rx->rx_list); |
c618db2a | 2511 | skb_queue_head_init(&sw_ctx_rx->async_hold); |
f66de3ee | 2512 | aead = &sw_ctx_rx->aead_recv; |
c46234eb DW |
2513 | } |
2514 | ||
3c4d7559 DW |
2515 | switch (crypto_info->cipher_type) { |
2516 | case TLS_CIPHER_AES_GCM_128: { | |
dc2724a6 TZ |
2517 | struct tls12_crypto_info_aes_gcm_128 *gcm_128_info; |
2518 | ||
2519 | gcm_128_info = (void *)crypto_info; | |
3c4d7559 DW |
2520 | nonce_size = TLS_CIPHER_AES_GCM_128_IV_SIZE; |
2521 | tag_size = TLS_CIPHER_AES_GCM_128_TAG_SIZE; | |
2522 | iv_size = TLS_CIPHER_AES_GCM_128_IV_SIZE; | |
dc2724a6 | 2523 | iv = gcm_128_info->iv; |
3c4d7559 | 2524 | rec_seq_size = TLS_CIPHER_AES_GCM_128_REC_SEQ_SIZE; |
dc2724a6 | 2525 | rec_seq = gcm_128_info->rec_seq; |
fb99bce7 DW |
2526 | keysize = TLS_CIPHER_AES_GCM_128_KEY_SIZE; |
2527 | key = gcm_128_info->key; | |
2528 | salt = gcm_128_info->salt; | |
f295b3ae VG |
2529 | salt_size = TLS_CIPHER_AES_GCM_128_SALT_SIZE; |
2530 | cipher_name = "gcm(aes)"; | |
fb99bce7 DW |
2531 | break; |
2532 | } | |
2533 | case TLS_CIPHER_AES_GCM_256: { | |
dc2724a6 TZ |
2534 | struct tls12_crypto_info_aes_gcm_256 *gcm_256_info; |
2535 | ||
2536 | gcm_256_info = (void *)crypto_info; | |
fb99bce7 DW |
2537 | nonce_size = TLS_CIPHER_AES_GCM_256_IV_SIZE; |
2538 | tag_size = TLS_CIPHER_AES_GCM_256_TAG_SIZE; | |
2539 | iv_size = TLS_CIPHER_AES_GCM_256_IV_SIZE; | |
dc2724a6 | 2540 | iv = gcm_256_info->iv; |
fb99bce7 | 2541 | rec_seq_size = TLS_CIPHER_AES_GCM_256_REC_SEQ_SIZE; |
dc2724a6 | 2542 | rec_seq = gcm_256_info->rec_seq; |
fb99bce7 DW |
2543 | keysize = TLS_CIPHER_AES_GCM_256_KEY_SIZE; |
2544 | key = gcm_256_info->key; | |
2545 | salt = gcm_256_info->salt; | |
f295b3ae VG |
2546 | salt_size = TLS_CIPHER_AES_GCM_256_SALT_SIZE; |
2547 | cipher_name = "gcm(aes)"; | |
2548 | break; | |
2549 | } | |
2550 | case TLS_CIPHER_AES_CCM_128: { | |
dc2724a6 TZ |
2551 | struct tls12_crypto_info_aes_ccm_128 *ccm_128_info; |
2552 | ||
2553 | ccm_128_info = (void *)crypto_info; | |
f295b3ae VG |
2554 | nonce_size = TLS_CIPHER_AES_CCM_128_IV_SIZE; |
2555 | tag_size = TLS_CIPHER_AES_CCM_128_TAG_SIZE; | |
2556 | iv_size = TLS_CIPHER_AES_CCM_128_IV_SIZE; | |
dc2724a6 | 2557 | iv = ccm_128_info->iv; |
f295b3ae | 2558 | rec_seq_size = TLS_CIPHER_AES_CCM_128_REC_SEQ_SIZE; |
dc2724a6 | 2559 | rec_seq = ccm_128_info->rec_seq; |
f295b3ae VG |
2560 | keysize = TLS_CIPHER_AES_CCM_128_KEY_SIZE; |
2561 | key = ccm_128_info->key; | |
2562 | salt = ccm_128_info->salt; | |
2563 | salt_size = TLS_CIPHER_AES_CCM_128_SALT_SIZE; | |
2564 | cipher_name = "ccm(aes)"; | |
3c4d7559 DW |
2565 | break; |
2566 | } | |
74ea6106 | 2567 | case TLS_CIPHER_CHACHA20_POLY1305: { |
dc2724a6 TZ |
2568 | struct tls12_crypto_info_chacha20_poly1305 *chacha20_poly1305_info; |
2569 | ||
74ea6106 VF |
2570 | chacha20_poly1305_info = (void *)crypto_info; |
2571 | nonce_size = 0; | |
2572 | tag_size = TLS_CIPHER_CHACHA20_POLY1305_TAG_SIZE; | |
2573 | iv_size = TLS_CIPHER_CHACHA20_POLY1305_IV_SIZE; | |
2574 | iv = chacha20_poly1305_info->iv; | |
2575 | rec_seq_size = TLS_CIPHER_CHACHA20_POLY1305_REC_SEQ_SIZE; | |
2576 | rec_seq = chacha20_poly1305_info->rec_seq; | |
2577 | keysize = TLS_CIPHER_CHACHA20_POLY1305_KEY_SIZE; | |
2578 | key = chacha20_poly1305_info->key; | |
2579 | salt = chacha20_poly1305_info->salt; | |
2580 | salt_size = TLS_CIPHER_CHACHA20_POLY1305_SALT_SIZE; | |
2581 | cipher_name = "rfc7539(chacha20,poly1305)"; | |
2582 | break; | |
2583 | } | |
227b9644 TZ |
2584 | case TLS_CIPHER_SM4_GCM: { |
2585 | struct tls12_crypto_info_sm4_gcm *sm4_gcm_info; | |
2586 | ||
2587 | sm4_gcm_info = (void *)crypto_info; | |
2588 | nonce_size = TLS_CIPHER_SM4_GCM_IV_SIZE; | |
2589 | tag_size = TLS_CIPHER_SM4_GCM_TAG_SIZE; | |
2590 | iv_size = TLS_CIPHER_SM4_GCM_IV_SIZE; | |
2591 | iv = sm4_gcm_info->iv; | |
2592 | rec_seq_size = TLS_CIPHER_SM4_GCM_REC_SEQ_SIZE; | |
2593 | rec_seq = sm4_gcm_info->rec_seq; | |
2594 | keysize = TLS_CIPHER_SM4_GCM_KEY_SIZE; | |
2595 | key = sm4_gcm_info->key; | |
2596 | salt = sm4_gcm_info->salt; | |
2597 | salt_size = TLS_CIPHER_SM4_GCM_SALT_SIZE; | |
2598 | cipher_name = "gcm(sm4)"; | |
2599 | break; | |
2600 | } | |
2601 | case TLS_CIPHER_SM4_CCM: { | |
2602 | struct tls12_crypto_info_sm4_ccm *sm4_ccm_info; | |
2603 | ||
2604 | sm4_ccm_info = (void *)crypto_info; | |
2605 | nonce_size = TLS_CIPHER_SM4_CCM_IV_SIZE; | |
2606 | tag_size = TLS_CIPHER_SM4_CCM_TAG_SIZE; | |
2607 | iv_size = TLS_CIPHER_SM4_CCM_IV_SIZE; | |
2608 | iv = sm4_ccm_info->iv; | |
2609 | rec_seq_size = TLS_CIPHER_SM4_CCM_REC_SEQ_SIZE; | |
2610 | rec_seq = sm4_ccm_info->rec_seq; | |
2611 | keysize = TLS_CIPHER_SM4_CCM_KEY_SIZE; | |
2612 | key = sm4_ccm_info->key; | |
2613 | salt = sm4_ccm_info->salt; | |
2614 | salt_size = TLS_CIPHER_SM4_CCM_SALT_SIZE; | |
2615 | cipher_name = "ccm(sm4)"; | |
2616 | break; | |
2617 | } | |
3c4d7559 DW |
2618 | default: |
2619 | rc = -EINVAL; | |
cf6d43ef | 2620 | goto free_priv; |
3c4d7559 DW |
2621 | } |
2622 | ||
130b392c DW |
2623 | if (crypto_info->version == TLS_1_3_VERSION) { |
2624 | nonce_size = 0; | |
4509de14 VG |
2625 | prot->aad_size = TLS_HEADER_SIZE; |
2626 | prot->tail_size = 1; | |
130b392c | 2627 | } else { |
4509de14 VG |
2628 | prot->aad_size = TLS_AAD_SPACE_SIZE; |
2629 | prot->tail_size = 0; | |
130b392c DW |
2630 | } |
2631 | ||
50a07aa5 JK |
2632 | /* Sanity-check the sizes for stack allocations. */ |
2633 | if (iv_size > MAX_IV_SIZE || nonce_size > MAX_IV_SIZE || | |
2634 | rec_seq_size > TLS_MAX_REC_SEQ_SIZE || tag_size != TLS_TAG_SIZE || | |
2635 | prot->aad_size > TLS_MAX_AAD_SIZE) { | |
2636 | rc = -EINVAL; | |
2637 | goto free_priv; | |
2638 | } | |
2639 | ||
4509de14 VG |
2640 | prot->version = crypto_info->version; |
2641 | prot->cipher_type = crypto_info->cipher_type; | |
2642 | prot->prepend_size = TLS_HEADER_SIZE + nonce_size; | |
2643 | prot->tag_size = tag_size; | |
2644 | prot->overhead_size = prot->prepend_size + | |
2645 | prot->tag_size + prot->tail_size; | |
2646 | prot->iv_size = iv_size; | |
f295b3ae VG |
2647 | prot->salt_size = salt_size; |
2648 | cctx->iv = kmalloc(iv_size + salt_size, GFP_KERNEL); | |
c46234eb | 2649 | if (!cctx->iv) { |
3c4d7559 | 2650 | rc = -ENOMEM; |
cf6d43ef | 2651 | goto free_priv; |
3c4d7559 | 2652 | } |
fb99bce7 | 2653 | /* Note: 128 & 256 bit salt are the same size */ |
4509de14 | 2654 | prot->rec_seq_size = rec_seq_size; |
f295b3ae VG |
2655 | memcpy(cctx->iv, salt, salt_size); |
2656 | memcpy(cctx->iv + salt_size, iv, iv_size); | |
969d5090 | 2657 | cctx->rec_seq = kmemdup(rec_seq, rec_seq_size, GFP_KERNEL); |
c46234eb | 2658 | if (!cctx->rec_seq) { |
3c4d7559 DW |
2659 | rc = -ENOMEM; |
2660 | goto free_iv; | |
2661 | } | |
c46234eb | 2662 | |
c46234eb | 2663 | if (!*aead) { |
f295b3ae | 2664 | *aead = crypto_alloc_aead(cipher_name, 0, 0); |
c46234eb DW |
2665 | if (IS_ERR(*aead)) { |
2666 | rc = PTR_ERR(*aead); | |
2667 | *aead = NULL; | |
3c4d7559 DW |
2668 | goto free_rec_seq; |
2669 | } | |
2670 | } | |
2671 | ||
2672 | ctx->push_pending_record = tls_sw_push_pending_record; | |
2673 | ||
fb99bce7 DW |
2674 | rc = crypto_aead_setkey(*aead, key, keysize); |
2675 | ||
3c4d7559 DW |
2676 | if (rc) |
2677 | goto free_aead; | |
2678 | ||
4509de14 | 2679 | rc = crypto_aead_setauthsize(*aead, prot->tag_size); |
c46234eb DW |
2680 | if (rc) |
2681 | goto free_aead; | |
2682 | ||
f66de3ee | 2683 | if (sw_ctx_rx) { |
692d7b5d | 2684 | tfm = crypto_aead_tfm(sw_ctx_rx->aead_recv); |
8497ded2 | 2685 | |
88527790 JK |
2686 | tls_update_rx_zc_capable(ctx); |
2687 | sw_ctx_rx->async_capable = | |
2688 | crypto_info->version != TLS_1_3_VERSION && | |
2689 | !!(tfm->__crt_alg->cra_flags & CRYPTO_ALG_ASYNC); | |
692d7b5d | 2690 | |
c46234eb DW |
2691 | /* Set up strparser */ |
2692 | memset(&cb, 0, sizeof(cb)); | |
2693 | cb.rcv_msg = tls_queue; | |
2694 | cb.parse_msg = tls_read_size; | |
2695 | ||
f66de3ee | 2696 | strp_init(&sw_ctx_rx->strp, sk, &cb); |
c46234eb DW |
2697 | } |
2698 | ||
2699 | goto out; | |
3c4d7559 DW |
2700 | |
2701 | free_aead: | |
c46234eb DW |
2702 | crypto_free_aead(*aead); |
2703 | *aead = NULL; | |
3c4d7559 | 2704 | free_rec_seq: |
c46234eb DW |
2705 | kfree(cctx->rec_seq); |
2706 | cctx->rec_seq = NULL; | |
3c4d7559 | 2707 | free_iv: |
f66de3ee BP |
2708 | kfree(cctx->iv); |
2709 | cctx->iv = NULL; | |
cf6d43ef | 2710 | free_priv: |
f66de3ee BP |
2711 | if (tx) { |
2712 | kfree(ctx->priv_ctx_tx); | |
2713 | ctx->priv_ctx_tx = NULL; | |
2714 | } else { | |
2715 | kfree(ctx->priv_ctx_rx); | |
2716 | ctx->priv_ctx_rx = NULL; | |
2717 | } | |
3c4d7559 DW |
2718 | out: |
2719 | return rc; | |
2720 | } |