Commit | Line | Data |
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3c4d7559 DW |
1 | /* |
2 | * Copyright (c) 2016-2017, Mellanox Technologies. All rights reserved. | |
3 | * Copyright (c) 2016-2017, Dave Watson <davejwatson@fb.com>. All rights reserved. | |
4 | * Copyright (c) 2016-2017, Lance Chao <lancerchao@fb.com>. All rights reserved. | |
5 | * Copyright (c) 2016, Fridolin Pokorny <fridolin.pokorny@gmail.com>. All rights reserved. | |
6 | * Copyright (c) 2016, Nikos Mavrogiannopoulos <nmav@gnutls.org>. All rights reserved. | |
d3b18ad3 | 7 | * Copyright (c) 2018, Covalent IO, Inc. http://covalent.io |
3c4d7559 DW |
8 | * |
9 | * This software is available to you under a choice of one of two | |
10 | * licenses. You may choose to be licensed under the terms of the GNU | |
11 | * General Public License (GPL) Version 2, available from the file | |
12 | * COPYING in the main directory of this source tree, or the | |
13 | * OpenIB.org BSD license below: | |
14 | * | |
15 | * Redistribution and use in source and binary forms, with or | |
16 | * without modification, are permitted provided that the following | |
17 | * conditions are met: | |
18 | * | |
19 | * - Redistributions of source code must retain the above | |
20 | * copyright notice, this list of conditions and the following | |
21 | * disclaimer. | |
22 | * | |
23 | * - Redistributions in binary form must reproduce the above | |
24 | * copyright notice, this list of conditions and the following | |
25 | * disclaimer in the documentation and/or other materials | |
26 | * provided with the distribution. | |
27 | * | |
28 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, | |
29 | * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF | |
30 | * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND | |
31 | * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS | |
32 | * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN | |
33 | * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN | |
34 | * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE | |
35 | * SOFTWARE. | |
36 | */ | |
37 | ||
c46234eb | 38 | #include <linux/sched/signal.h> |
3c4d7559 DW |
39 | #include <linux/module.h> |
40 | #include <crypto/aead.h> | |
41 | ||
c46234eb | 42 | #include <net/strparser.h> |
3c4d7559 DW |
43 | #include <net/tls.h> |
44 | ||
b16520f7 KC |
45 | #define MAX_IV_SIZE TLS_CIPHER_AES_GCM_128_IV_SIZE |
46 | ||
0927f71d DRK |
47 | static int __skb_nsg(struct sk_buff *skb, int offset, int len, |
48 | unsigned int recursion_level) | |
49 | { | |
50 | int start = skb_headlen(skb); | |
51 | int i, chunk = start - offset; | |
52 | struct sk_buff *frag_iter; | |
53 | int elt = 0; | |
54 | ||
55 | if (unlikely(recursion_level >= 24)) | |
56 | return -EMSGSIZE; | |
57 | ||
58 | if (chunk > 0) { | |
59 | if (chunk > len) | |
60 | chunk = len; | |
61 | elt++; | |
62 | len -= chunk; | |
63 | if (len == 0) | |
64 | return elt; | |
65 | offset += chunk; | |
66 | } | |
67 | ||
68 | for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) { | |
69 | int end; | |
70 | ||
71 | WARN_ON(start > offset + len); | |
72 | ||
73 | end = start + skb_frag_size(&skb_shinfo(skb)->frags[i]); | |
74 | chunk = end - offset; | |
75 | if (chunk > 0) { | |
76 | if (chunk > len) | |
77 | chunk = len; | |
78 | elt++; | |
79 | len -= chunk; | |
80 | if (len == 0) | |
81 | return elt; | |
82 | offset += chunk; | |
83 | } | |
84 | start = end; | |
85 | } | |
86 | ||
87 | if (unlikely(skb_has_frag_list(skb))) { | |
88 | skb_walk_frags(skb, frag_iter) { | |
89 | int end, ret; | |
90 | ||
91 | WARN_ON(start > offset + len); | |
92 | ||
93 | end = start + frag_iter->len; | |
94 | chunk = end - offset; | |
95 | if (chunk > 0) { | |
96 | if (chunk > len) | |
97 | chunk = len; | |
98 | ret = __skb_nsg(frag_iter, offset - start, chunk, | |
99 | recursion_level + 1); | |
100 | if (unlikely(ret < 0)) | |
101 | return ret; | |
102 | elt += ret; | |
103 | len -= chunk; | |
104 | if (len == 0) | |
105 | return elt; | |
106 | offset += chunk; | |
107 | } | |
108 | start = end; | |
109 | } | |
110 | } | |
111 | BUG_ON(len); | |
112 | return elt; | |
113 | } | |
114 | ||
115 | /* Return the number of scatterlist elements required to completely map the | |
116 | * skb, or -EMSGSIZE if the recursion depth is exceeded. | |
117 | */ | |
118 | static int skb_nsg(struct sk_buff *skb, int offset, int len) | |
119 | { | |
120 | return __skb_nsg(skb, offset, len, 0); | |
121 | } | |
122 | ||
94524d8f VG |
123 | static void tls_decrypt_done(struct crypto_async_request *req, int err) |
124 | { | |
125 | struct aead_request *aead_req = (struct aead_request *)req; | |
94524d8f | 126 | struct scatterlist *sgout = aead_req->dst; |
692d7b5d | 127 | struct scatterlist *sgin = aead_req->src; |
7a3dd8c8 JF |
128 | struct tls_sw_context_rx *ctx; |
129 | struct tls_context *tls_ctx; | |
94524d8f | 130 | struct scatterlist *sg; |
7a3dd8c8 | 131 | struct sk_buff *skb; |
94524d8f | 132 | unsigned int pages; |
7a3dd8c8 JF |
133 | int pending; |
134 | ||
135 | skb = (struct sk_buff *)req->data; | |
136 | tls_ctx = tls_get_ctx(skb->sk); | |
137 | ctx = tls_sw_ctx_rx(tls_ctx); | |
94524d8f VG |
138 | |
139 | /* Propagate if there was an err */ | |
140 | if (err) { | |
141 | ctx->async_wait.err = err; | |
7a3dd8c8 | 142 | tls_err_abort(skb->sk, err); |
692d7b5d VG |
143 | } else { |
144 | struct strp_msg *rxm = strp_msg(skb); | |
145 | ||
146 | rxm->offset += tls_ctx->rx.prepend_size; | |
147 | rxm->full_len -= tls_ctx->rx.overhead_size; | |
94524d8f VG |
148 | } |
149 | ||
7a3dd8c8 JF |
150 | /* After using skb->sk to propagate sk through crypto async callback |
151 | * we need to NULL it again. | |
152 | */ | |
153 | skb->sk = NULL; | |
154 | ||
94524d8f | 155 | |
692d7b5d VG |
156 | /* Free the destination pages if skb was not decrypted inplace */ |
157 | if (sgout != sgin) { | |
158 | /* Skip the first S/G entry as it points to AAD */ | |
159 | for_each_sg(sg_next(sgout), sg, UINT_MAX, pages) { | |
160 | if (!sg) | |
161 | break; | |
162 | put_page(sg_page(sg)); | |
163 | } | |
94524d8f VG |
164 | } |
165 | ||
166 | kfree(aead_req); | |
167 | ||
692d7b5d VG |
168 | pending = atomic_dec_return(&ctx->decrypt_pending); |
169 | ||
94524d8f VG |
170 | if (!pending && READ_ONCE(ctx->async_notify)) |
171 | complete(&ctx->async_wait.completion); | |
172 | } | |
173 | ||
c46234eb | 174 | static int tls_do_decryption(struct sock *sk, |
94524d8f | 175 | struct sk_buff *skb, |
c46234eb DW |
176 | struct scatterlist *sgin, |
177 | struct scatterlist *sgout, | |
178 | char *iv_recv, | |
179 | size_t data_len, | |
94524d8f VG |
180 | struct aead_request *aead_req, |
181 | bool async) | |
c46234eb DW |
182 | { |
183 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
f66de3ee | 184 | struct tls_sw_context_rx *ctx = tls_sw_ctx_rx(tls_ctx); |
c46234eb | 185 | int ret; |
c46234eb | 186 | |
0b243d00 | 187 | aead_request_set_tfm(aead_req, ctx->aead_recv); |
a2ef9b6a | 188 | aead_request_set_ad(aead_req, tls_ctx->rx.aad_size); |
c46234eb DW |
189 | aead_request_set_crypt(aead_req, sgin, sgout, |
190 | data_len + tls_ctx->rx.tag_size, | |
191 | (u8 *)iv_recv); | |
c46234eb | 192 | |
94524d8f | 193 | if (async) { |
7a3dd8c8 JF |
194 | /* Using skb->sk to push sk through to crypto async callback |
195 | * handler. This allows propagating errors up to the socket | |
196 | * if needed. It _must_ be cleared in the async handler | |
197 | * before kfree_skb is called. We _know_ skb->sk is NULL | |
198 | * because it is a clone from strparser. | |
199 | */ | |
200 | skb->sk = sk; | |
94524d8f VG |
201 | aead_request_set_callback(aead_req, |
202 | CRYPTO_TFM_REQ_MAY_BACKLOG, | |
203 | tls_decrypt_done, skb); | |
204 | atomic_inc(&ctx->decrypt_pending); | |
205 | } else { | |
206 | aead_request_set_callback(aead_req, | |
207 | CRYPTO_TFM_REQ_MAY_BACKLOG, | |
208 | crypto_req_done, &ctx->async_wait); | |
209 | } | |
210 | ||
211 | ret = crypto_aead_decrypt(aead_req); | |
212 | if (ret == -EINPROGRESS) { | |
213 | if (async) | |
214 | return ret; | |
215 | ||
216 | ret = crypto_wait_req(ret, &ctx->async_wait); | |
217 | } | |
218 | ||
219 | if (async) | |
220 | atomic_dec(&ctx->decrypt_pending); | |
221 | ||
c46234eb DW |
222 | return ret; |
223 | } | |
224 | ||
d829e9c4 | 225 | static void tls_trim_both_msgs(struct sock *sk, int target_size) |
3c4d7559 DW |
226 | { |
227 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
f66de3ee | 228 | struct tls_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx); |
a42055e8 | 229 | struct tls_rec *rec = ctx->open_rec; |
3c4d7559 | 230 | |
d829e9c4 | 231 | sk_msg_trim(sk, &rec->msg_plaintext, target_size); |
3c4d7559 | 232 | if (target_size > 0) |
dbe42559 | 233 | target_size += tls_ctx->tx.overhead_size; |
d829e9c4 | 234 | sk_msg_trim(sk, &rec->msg_encrypted, target_size); |
3c4d7559 DW |
235 | } |
236 | ||
d829e9c4 | 237 | static int tls_alloc_encrypted_msg(struct sock *sk, int len) |
3c4d7559 DW |
238 | { |
239 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
f66de3ee | 240 | struct tls_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx); |
a42055e8 | 241 | struct tls_rec *rec = ctx->open_rec; |
d829e9c4 | 242 | struct sk_msg *msg_en = &rec->msg_encrypted; |
3c4d7559 | 243 | |
d829e9c4 | 244 | return sk_msg_alloc(sk, msg_en, len, 0); |
3c4d7559 DW |
245 | } |
246 | ||
d829e9c4 | 247 | static int tls_clone_plaintext_msg(struct sock *sk, int required) |
3c4d7559 DW |
248 | { |
249 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
f66de3ee | 250 | struct tls_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx); |
a42055e8 | 251 | struct tls_rec *rec = ctx->open_rec; |
d829e9c4 DB |
252 | struct sk_msg *msg_pl = &rec->msg_plaintext; |
253 | struct sk_msg *msg_en = &rec->msg_encrypted; | |
4e6d4720 | 254 | int skip, len; |
3c4d7559 | 255 | |
d829e9c4 DB |
256 | /* We add page references worth len bytes from encrypted sg |
257 | * at the end of plaintext sg. It is guaranteed that msg_en | |
4e6d4720 VG |
258 | * has enough required room (ensured by caller). |
259 | */ | |
d829e9c4 | 260 | len = required - msg_pl->sg.size; |
52ea992c | 261 | |
d829e9c4 DB |
262 | /* Skip initial bytes in msg_en's data to be able to use |
263 | * same offset of both plain and encrypted data. | |
4e6d4720 | 264 | */ |
d829e9c4 | 265 | skip = tls_ctx->tx.prepend_size + msg_pl->sg.size; |
4e6d4720 | 266 | |
d829e9c4 | 267 | return sk_msg_clone(sk, msg_pl, msg_en, skip, len); |
3c4d7559 DW |
268 | } |
269 | ||
d3b18ad3 | 270 | static struct tls_rec *tls_get_rec(struct sock *sk) |
3c4d7559 DW |
271 | { |
272 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
f66de3ee | 273 | struct tls_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx); |
d3b18ad3 JF |
274 | struct sk_msg *msg_pl, *msg_en; |
275 | struct tls_rec *rec; | |
276 | int mem_size; | |
3c4d7559 | 277 | |
d3b18ad3 JF |
278 | mem_size = sizeof(struct tls_rec) + crypto_aead_reqsize(ctx->aead_send); |
279 | ||
280 | rec = kzalloc(mem_size, sk->sk_allocation); | |
a42055e8 | 281 | if (!rec) |
d3b18ad3 JF |
282 | return NULL; |
283 | ||
284 | msg_pl = &rec->msg_plaintext; | |
285 | msg_en = &rec->msg_encrypted; | |
286 | ||
287 | sk_msg_init(msg_pl); | |
288 | sk_msg_init(msg_en); | |
289 | ||
290 | sg_init_table(rec->sg_aead_in, 2); | |
291 | sg_set_buf(&rec->sg_aead_in[0], rec->aad_space, | |
a2ef9b6a | 292 | tls_ctx->tx.aad_size); |
d3b18ad3 JF |
293 | sg_unmark_end(&rec->sg_aead_in[1]); |
294 | ||
295 | sg_init_table(rec->sg_aead_out, 2); | |
296 | sg_set_buf(&rec->sg_aead_out[0], rec->aad_space, | |
a2ef9b6a | 297 | tls_ctx->tx.aad_size); |
d3b18ad3 JF |
298 | sg_unmark_end(&rec->sg_aead_out[1]); |
299 | ||
300 | return rec; | |
301 | } | |
a42055e8 | 302 | |
d3b18ad3 JF |
303 | static void tls_free_rec(struct sock *sk, struct tls_rec *rec) |
304 | { | |
d829e9c4 DB |
305 | sk_msg_free(sk, &rec->msg_encrypted); |
306 | sk_msg_free(sk, &rec->msg_plaintext); | |
c774973e | 307 | kfree(rec); |
a42055e8 VG |
308 | } |
309 | ||
d3b18ad3 JF |
310 | static void tls_free_open_rec(struct sock *sk) |
311 | { | |
312 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
313 | struct tls_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx); | |
314 | struct tls_rec *rec = ctx->open_rec; | |
315 | ||
316 | if (rec) { | |
317 | tls_free_rec(sk, rec); | |
318 | ctx->open_rec = NULL; | |
319 | } | |
320 | } | |
321 | ||
a42055e8 VG |
322 | int tls_tx_records(struct sock *sk, int flags) |
323 | { | |
324 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
325 | struct tls_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx); | |
326 | struct tls_rec *rec, *tmp; | |
d829e9c4 | 327 | struct sk_msg *msg_en; |
a42055e8 VG |
328 | int tx_flags, rc = 0; |
329 | ||
330 | if (tls_is_partially_sent_record(tls_ctx)) { | |
9932a29a | 331 | rec = list_first_entry(&ctx->tx_list, |
a42055e8 VG |
332 | struct tls_rec, list); |
333 | ||
334 | if (flags == -1) | |
335 | tx_flags = rec->tx_flags; | |
336 | else | |
337 | tx_flags = flags; | |
338 | ||
339 | rc = tls_push_partial_record(sk, tls_ctx, tx_flags); | |
340 | if (rc) | |
341 | goto tx_err; | |
342 | ||
343 | /* Full record has been transmitted. | |
9932a29a | 344 | * Remove the head of tx_list |
a42055e8 | 345 | */ |
a42055e8 | 346 | list_del(&rec->list); |
d829e9c4 | 347 | sk_msg_free(sk, &rec->msg_plaintext); |
a42055e8 VG |
348 | kfree(rec); |
349 | } | |
350 | ||
9932a29a VG |
351 | /* Tx all ready records */ |
352 | list_for_each_entry_safe(rec, tmp, &ctx->tx_list, list) { | |
353 | if (READ_ONCE(rec->tx_ready)) { | |
a42055e8 VG |
354 | if (flags == -1) |
355 | tx_flags = rec->tx_flags; | |
356 | else | |
357 | tx_flags = flags; | |
358 | ||
d829e9c4 | 359 | msg_en = &rec->msg_encrypted; |
a42055e8 | 360 | rc = tls_push_sg(sk, tls_ctx, |
d829e9c4 | 361 | &msg_en->sg.data[msg_en->sg.curr], |
a42055e8 VG |
362 | 0, tx_flags); |
363 | if (rc) | |
364 | goto tx_err; | |
365 | ||
a42055e8 | 366 | list_del(&rec->list); |
d829e9c4 | 367 | sk_msg_free(sk, &rec->msg_plaintext); |
a42055e8 VG |
368 | kfree(rec); |
369 | } else { | |
370 | break; | |
371 | } | |
372 | } | |
373 | ||
374 | tx_err: | |
375 | if (rc < 0 && rc != -EAGAIN) | |
376 | tls_err_abort(sk, EBADMSG); | |
377 | ||
378 | return rc; | |
379 | } | |
380 | ||
381 | static void tls_encrypt_done(struct crypto_async_request *req, int err) | |
382 | { | |
383 | struct aead_request *aead_req = (struct aead_request *)req; | |
384 | struct sock *sk = req->data; | |
385 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
386 | struct tls_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx); | |
d829e9c4 DB |
387 | struct scatterlist *sge; |
388 | struct sk_msg *msg_en; | |
a42055e8 VG |
389 | struct tls_rec *rec; |
390 | bool ready = false; | |
391 | int pending; | |
392 | ||
393 | rec = container_of(aead_req, struct tls_rec, aead_req); | |
d829e9c4 | 394 | msg_en = &rec->msg_encrypted; |
a42055e8 | 395 | |
d829e9c4 DB |
396 | sge = sk_msg_elem(msg_en, msg_en->sg.curr); |
397 | sge->offset -= tls_ctx->tx.prepend_size; | |
398 | sge->length += tls_ctx->tx.prepend_size; | |
a42055e8 | 399 | |
80ece6a0 | 400 | /* Check if error is previously set on socket */ |
a42055e8 | 401 | if (err || sk->sk_err) { |
a42055e8 VG |
402 | rec = NULL; |
403 | ||
404 | /* If err is already set on socket, return the same code */ | |
405 | if (sk->sk_err) { | |
406 | ctx->async_wait.err = sk->sk_err; | |
407 | } else { | |
408 | ctx->async_wait.err = err; | |
409 | tls_err_abort(sk, err); | |
410 | } | |
411 | } | |
412 | ||
9932a29a VG |
413 | if (rec) { |
414 | struct tls_rec *first_rec; | |
415 | ||
416 | /* Mark the record as ready for transmission */ | |
417 | smp_store_mb(rec->tx_ready, true); | |
418 | ||
419 | /* If received record is at head of tx_list, schedule tx */ | |
420 | first_rec = list_first_entry(&ctx->tx_list, | |
421 | struct tls_rec, list); | |
422 | if (rec == first_rec) | |
423 | ready = true; | |
424 | } | |
a42055e8 VG |
425 | |
426 | pending = atomic_dec_return(&ctx->encrypt_pending); | |
427 | ||
428 | if (!pending && READ_ONCE(ctx->async_notify)) | |
429 | complete(&ctx->async_wait.completion); | |
430 | ||
431 | if (!ready) | |
432 | return; | |
433 | ||
434 | /* Schedule the transmission */ | |
435 | if (!test_and_set_bit(BIT_TX_SCHEDULED, &ctx->tx_bitmask)) | |
d829e9c4 | 436 | schedule_delayed_work(&ctx->tx_work.work, 1); |
3c4d7559 DW |
437 | } |
438 | ||
a42055e8 VG |
439 | static int tls_do_encryption(struct sock *sk, |
440 | struct tls_context *tls_ctx, | |
a447da7d DB |
441 | struct tls_sw_context_tx *ctx, |
442 | struct aead_request *aead_req, | |
d829e9c4 | 443 | size_t data_len, u32 start) |
3c4d7559 | 444 | { |
a42055e8 | 445 | struct tls_rec *rec = ctx->open_rec; |
d829e9c4 DB |
446 | struct sk_msg *msg_en = &rec->msg_encrypted; |
447 | struct scatterlist *sge = sk_msg_elem(msg_en, start); | |
3c4d7559 DW |
448 | int rc; |
449 | ||
32eb67b9 DW |
450 | memcpy(rec->iv_data, tls_ctx->tx.iv, sizeof(rec->iv_data)); |
451 | ||
d829e9c4 DB |
452 | sge->offset += tls_ctx->tx.prepend_size; |
453 | sge->length -= tls_ctx->tx.prepend_size; | |
3c4d7559 | 454 | |
d829e9c4 | 455 | msg_en->sg.curr = start; |
4e6d4720 | 456 | |
3c4d7559 | 457 | aead_request_set_tfm(aead_req, ctx->aead_send); |
a2ef9b6a | 458 | aead_request_set_ad(aead_req, tls_ctx->tx.aad_size); |
d829e9c4 DB |
459 | aead_request_set_crypt(aead_req, rec->sg_aead_in, |
460 | rec->sg_aead_out, | |
32eb67b9 | 461 | data_len, rec->iv_data); |
a54667f6 VG |
462 | |
463 | aead_request_set_callback(aead_req, CRYPTO_TFM_REQ_MAY_BACKLOG, | |
a42055e8 VG |
464 | tls_encrypt_done, sk); |
465 | ||
9932a29a VG |
466 | /* Add the record in tx_list */ |
467 | list_add_tail((struct list_head *)&rec->list, &ctx->tx_list); | |
a42055e8 | 468 | atomic_inc(&ctx->encrypt_pending); |
a54667f6 | 469 | |
a42055e8 VG |
470 | rc = crypto_aead_encrypt(aead_req); |
471 | if (!rc || rc != -EINPROGRESS) { | |
472 | atomic_dec(&ctx->encrypt_pending); | |
d829e9c4 DB |
473 | sge->offset -= tls_ctx->tx.prepend_size; |
474 | sge->length += tls_ctx->tx.prepend_size; | |
a42055e8 | 475 | } |
3c4d7559 | 476 | |
9932a29a VG |
477 | if (!rc) { |
478 | WRITE_ONCE(rec->tx_ready, true); | |
479 | } else if (rc != -EINPROGRESS) { | |
480 | list_del(&rec->list); | |
a42055e8 | 481 | return rc; |
9932a29a | 482 | } |
3c4d7559 | 483 | |
a42055e8 VG |
484 | /* Unhook the record from context if encryption is not failure */ |
485 | ctx->open_rec = NULL; | |
486 | tls_advance_record_sn(sk, &tls_ctx->tx); | |
3c4d7559 DW |
487 | return rc; |
488 | } | |
489 | ||
d3b18ad3 JF |
490 | static int tls_split_open_record(struct sock *sk, struct tls_rec *from, |
491 | struct tls_rec **to, struct sk_msg *msg_opl, | |
492 | struct sk_msg *msg_oen, u32 split_point, | |
493 | u32 tx_overhead_size, u32 *orig_end) | |
494 | { | |
495 | u32 i, j, bytes = 0, apply = msg_opl->apply_bytes; | |
496 | struct scatterlist *sge, *osge, *nsge; | |
497 | u32 orig_size = msg_opl->sg.size; | |
498 | struct scatterlist tmp = { }; | |
499 | struct sk_msg *msg_npl; | |
500 | struct tls_rec *new; | |
501 | int ret; | |
502 | ||
503 | new = tls_get_rec(sk); | |
504 | if (!new) | |
505 | return -ENOMEM; | |
506 | ret = sk_msg_alloc(sk, &new->msg_encrypted, msg_opl->sg.size + | |
507 | tx_overhead_size, 0); | |
508 | if (ret < 0) { | |
509 | tls_free_rec(sk, new); | |
510 | return ret; | |
511 | } | |
512 | ||
513 | *orig_end = msg_opl->sg.end; | |
514 | i = msg_opl->sg.start; | |
515 | sge = sk_msg_elem(msg_opl, i); | |
516 | while (apply && sge->length) { | |
517 | if (sge->length > apply) { | |
518 | u32 len = sge->length - apply; | |
519 | ||
520 | get_page(sg_page(sge)); | |
521 | sg_set_page(&tmp, sg_page(sge), len, | |
522 | sge->offset + apply); | |
523 | sge->length = apply; | |
524 | bytes += apply; | |
525 | apply = 0; | |
526 | } else { | |
527 | apply -= sge->length; | |
528 | bytes += sge->length; | |
529 | } | |
530 | ||
531 | sk_msg_iter_var_next(i); | |
532 | if (i == msg_opl->sg.end) | |
533 | break; | |
534 | sge = sk_msg_elem(msg_opl, i); | |
535 | } | |
536 | ||
537 | msg_opl->sg.end = i; | |
538 | msg_opl->sg.curr = i; | |
539 | msg_opl->sg.copybreak = 0; | |
540 | msg_opl->apply_bytes = 0; | |
541 | msg_opl->sg.size = bytes; | |
542 | ||
543 | msg_npl = &new->msg_plaintext; | |
544 | msg_npl->apply_bytes = apply; | |
545 | msg_npl->sg.size = orig_size - bytes; | |
546 | ||
547 | j = msg_npl->sg.start; | |
548 | nsge = sk_msg_elem(msg_npl, j); | |
549 | if (tmp.length) { | |
550 | memcpy(nsge, &tmp, sizeof(*nsge)); | |
551 | sk_msg_iter_var_next(j); | |
552 | nsge = sk_msg_elem(msg_npl, j); | |
553 | } | |
554 | ||
555 | osge = sk_msg_elem(msg_opl, i); | |
556 | while (osge->length) { | |
557 | memcpy(nsge, osge, sizeof(*nsge)); | |
558 | sg_unmark_end(nsge); | |
559 | sk_msg_iter_var_next(i); | |
560 | sk_msg_iter_var_next(j); | |
561 | if (i == *orig_end) | |
562 | break; | |
563 | osge = sk_msg_elem(msg_opl, i); | |
564 | nsge = sk_msg_elem(msg_npl, j); | |
565 | } | |
566 | ||
567 | msg_npl->sg.end = j; | |
568 | msg_npl->sg.curr = j; | |
569 | msg_npl->sg.copybreak = 0; | |
570 | ||
571 | *to = new; | |
572 | return 0; | |
573 | } | |
574 | ||
575 | static void tls_merge_open_record(struct sock *sk, struct tls_rec *to, | |
576 | struct tls_rec *from, u32 orig_end) | |
577 | { | |
578 | struct sk_msg *msg_npl = &from->msg_plaintext; | |
579 | struct sk_msg *msg_opl = &to->msg_plaintext; | |
580 | struct scatterlist *osge, *nsge; | |
581 | u32 i, j; | |
582 | ||
583 | i = msg_opl->sg.end; | |
584 | sk_msg_iter_var_prev(i); | |
585 | j = msg_npl->sg.start; | |
586 | ||
587 | osge = sk_msg_elem(msg_opl, i); | |
588 | nsge = sk_msg_elem(msg_npl, j); | |
589 | ||
590 | if (sg_page(osge) == sg_page(nsge) && | |
591 | osge->offset + osge->length == nsge->offset) { | |
592 | osge->length += nsge->length; | |
593 | put_page(sg_page(nsge)); | |
594 | } | |
595 | ||
596 | msg_opl->sg.end = orig_end; | |
597 | msg_opl->sg.curr = orig_end; | |
598 | msg_opl->sg.copybreak = 0; | |
599 | msg_opl->apply_bytes = msg_opl->sg.size + msg_npl->sg.size; | |
600 | msg_opl->sg.size += msg_npl->sg.size; | |
601 | ||
602 | sk_msg_free(sk, &to->msg_encrypted); | |
603 | sk_msg_xfer_full(&to->msg_encrypted, &from->msg_encrypted); | |
604 | ||
605 | kfree(from); | |
606 | } | |
607 | ||
3c4d7559 DW |
608 | static int tls_push_record(struct sock *sk, int flags, |
609 | unsigned char record_type) | |
610 | { | |
611 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
f66de3ee | 612 | struct tls_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx); |
d3b18ad3 JF |
613 | struct tls_rec *rec = ctx->open_rec, *tmp = NULL; |
614 | u32 i, split_point, uninitialized_var(orig_end); | |
d829e9c4 | 615 | struct sk_msg *msg_pl, *msg_en; |
a447da7d | 616 | struct aead_request *req; |
d3b18ad3 | 617 | bool split; |
3c4d7559 DW |
618 | int rc; |
619 | ||
a42055e8 VG |
620 | if (!rec) |
621 | return 0; | |
a447da7d | 622 | |
d829e9c4 DB |
623 | msg_pl = &rec->msg_plaintext; |
624 | msg_en = &rec->msg_encrypted; | |
625 | ||
d3b18ad3 JF |
626 | split_point = msg_pl->apply_bytes; |
627 | split = split_point && split_point < msg_pl->sg.size; | |
628 | if (split) { | |
629 | rc = tls_split_open_record(sk, rec, &tmp, msg_pl, msg_en, | |
630 | split_point, tls_ctx->tx.overhead_size, | |
631 | &orig_end); | |
632 | if (rc < 0) | |
633 | return rc; | |
634 | sk_msg_trim(sk, msg_en, msg_pl->sg.size + | |
635 | tls_ctx->tx.overhead_size); | |
636 | } | |
637 | ||
a42055e8 VG |
638 | rec->tx_flags = flags; |
639 | req = &rec->aead_req; | |
3c4d7559 | 640 | |
d829e9c4 DB |
641 | i = msg_pl->sg.end; |
642 | sk_msg_iter_var_prev(i); | |
643 | sg_mark_end(sk_msg_elem(msg_pl, i)); | |
a42055e8 | 644 | |
d829e9c4 DB |
645 | i = msg_pl->sg.start; |
646 | sg_chain(rec->sg_aead_in, 2, rec->inplace_crypto ? | |
647 | &msg_en->sg.data[i] : &msg_pl->sg.data[i]); | |
648 | ||
649 | i = msg_en->sg.end; | |
650 | sk_msg_iter_var_prev(i); | |
651 | sg_mark_end(sk_msg_elem(msg_en, i)); | |
652 | ||
653 | i = msg_en->sg.start; | |
654 | sg_chain(rec->sg_aead_out, 2, &msg_en->sg.data[i]); | |
655 | ||
656 | tls_make_aad(rec->aad_space, msg_pl->sg.size, | |
dbe42559 | 657 | tls_ctx->tx.rec_seq, tls_ctx->tx.rec_seq_size, |
3c4d7559 DW |
658 | record_type); |
659 | ||
660 | tls_fill_prepend(tls_ctx, | |
d829e9c4 DB |
661 | page_address(sg_page(&msg_en->sg.data[i])) + |
662 | msg_en->sg.data[i].offset, msg_pl->sg.size, | |
663 | record_type); | |
3c4d7559 | 664 | |
d829e9c4 | 665 | tls_ctx->pending_open_record_frags = false; |
3c4d7559 | 666 | |
d829e9c4 | 667 | rc = tls_do_encryption(sk, tls_ctx, ctx, req, msg_pl->sg.size, i); |
a42055e8 | 668 | if (rc < 0) { |
d3b18ad3 | 669 | if (rc != -EINPROGRESS) { |
d829e9c4 | 670 | tls_err_abort(sk, EBADMSG); |
d3b18ad3 JF |
671 | if (split) { |
672 | tls_ctx->pending_open_record_frags = true; | |
673 | tls_merge_open_record(sk, rec, tmp, orig_end); | |
674 | } | |
675 | } | |
a42055e8 | 676 | return rc; |
d3b18ad3 JF |
677 | } else if (split) { |
678 | msg_pl = &tmp->msg_plaintext; | |
679 | msg_en = &tmp->msg_encrypted; | |
680 | sk_msg_trim(sk, msg_en, msg_pl->sg.size + | |
681 | tls_ctx->tx.overhead_size); | |
682 | tls_ctx->pending_open_record_frags = true; | |
683 | ctx->open_rec = tmp; | |
a42055e8 | 684 | } |
3c4d7559 | 685 | |
9932a29a | 686 | return tls_tx_records(sk, flags); |
3c4d7559 DW |
687 | } |
688 | ||
d3b18ad3 JF |
689 | static int bpf_exec_tx_verdict(struct sk_msg *msg, struct sock *sk, |
690 | bool full_record, u8 record_type, | |
691 | size_t *copied, int flags) | |
3c4d7559 DW |
692 | { |
693 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
f66de3ee | 694 | struct tls_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx); |
d3b18ad3 JF |
695 | struct sk_msg msg_redir = { }; |
696 | struct sk_psock *psock; | |
697 | struct sock *sk_redir; | |
a42055e8 | 698 | struct tls_rec *rec; |
0608c69c | 699 | bool enospc, policy; |
d3b18ad3 | 700 | int err = 0, send; |
7246d8ed | 701 | u32 delta = 0; |
d3b18ad3 | 702 | |
0608c69c | 703 | policy = !(flags & MSG_SENDPAGE_NOPOLICY); |
d3b18ad3 | 704 | psock = sk_psock_get(sk); |
0608c69c | 705 | if (!psock || !policy) |
d3b18ad3 JF |
706 | return tls_push_record(sk, flags, record_type); |
707 | more_data: | |
708 | enospc = sk_msg_full(msg); | |
7246d8ed JF |
709 | if (psock->eval == __SK_NONE) { |
710 | delta = msg->sg.size; | |
d3b18ad3 | 711 | psock->eval = sk_psock_msg_verdict(sk, psock, msg); |
7246d8ed JF |
712 | if (delta < msg->sg.size) |
713 | delta -= msg->sg.size; | |
714 | else | |
715 | delta = 0; | |
716 | } | |
d3b18ad3 JF |
717 | if (msg->cork_bytes && msg->cork_bytes > msg->sg.size && |
718 | !enospc && !full_record) { | |
719 | err = -ENOSPC; | |
720 | goto out_err; | |
721 | } | |
722 | msg->cork_bytes = 0; | |
723 | send = msg->sg.size; | |
724 | if (msg->apply_bytes && msg->apply_bytes < send) | |
725 | send = msg->apply_bytes; | |
726 | ||
727 | switch (psock->eval) { | |
728 | case __SK_PASS: | |
729 | err = tls_push_record(sk, flags, record_type); | |
730 | if (err < 0) { | |
731 | *copied -= sk_msg_free(sk, msg); | |
732 | tls_free_open_rec(sk); | |
733 | goto out_err; | |
734 | } | |
735 | break; | |
736 | case __SK_REDIRECT: | |
737 | sk_redir = psock->sk_redir; | |
738 | memcpy(&msg_redir, msg, sizeof(*msg)); | |
739 | if (msg->apply_bytes < send) | |
740 | msg->apply_bytes = 0; | |
741 | else | |
742 | msg->apply_bytes -= send; | |
743 | sk_msg_return_zero(sk, msg, send); | |
744 | msg->sg.size -= send; | |
745 | release_sock(sk); | |
746 | err = tcp_bpf_sendmsg_redir(sk_redir, &msg_redir, send, flags); | |
747 | lock_sock(sk); | |
748 | if (err < 0) { | |
749 | *copied -= sk_msg_free_nocharge(sk, &msg_redir); | |
750 | msg->sg.size = 0; | |
751 | } | |
752 | if (msg->sg.size == 0) | |
753 | tls_free_open_rec(sk); | |
754 | break; | |
755 | case __SK_DROP: | |
756 | default: | |
757 | sk_msg_free_partial(sk, msg, send); | |
758 | if (msg->apply_bytes < send) | |
759 | msg->apply_bytes = 0; | |
760 | else | |
761 | msg->apply_bytes -= send; | |
762 | if (msg->sg.size == 0) | |
763 | tls_free_open_rec(sk); | |
7246d8ed | 764 | *copied -= (send + delta); |
d3b18ad3 JF |
765 | err = -EACCES; |
766 | } | |
a42055e8 | 767 | |
d3b18ad3 JF |
768 | if (likely(!err)) { |
769 | bool reset_eval = !ctx->open_rec; | |
a42055e8 | 770 | |
d3b18ad3 JF |
771 | rec = ctx->open_rec; |
772 | if (rec) { | |
773 | msg = &rec->msg_plaintext; | |
774 | if (!msg->apply_bytes) | |
775 | reset_eval = true; | |
776 | } | |
777 | if (reset_eval) { | |
778 | psock->eval = __SK_NONE; | |
779 | if (psock->sk_redir) { | |
780 | sock_put(psock->sk_redir); | |
781 | psock->sk_redir = NULL; | |
782 | } | |
783 | } | |
784 | if (rec) | |
785 | goto more_data; | |
786 | } | |
787 | out_err: | |
788 | sk_psock_put(sk, psock); | |
789 | return err; | |
790 | } | |
791 | ||
792 | static int tls_sw_push_pending_record(struct sock *sk, int flags) | |
793 | { | |
794 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
795 | struct tls_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx); | |
796 | struct tls_rec *rec = ctx->open_rec; | |
797 | struct sk_msg *msg_pl; | |
798 | size_t copied; | |
a42055e8 | 799 | |
a42055e8 | 800 | if (!rec) |
d3b18ad3 | 801 | return 0; |
a42055e8 | 802 | |
d829e9c4 | 803 | msg_pl = &rec->msg_plaintext; |
d3b18ad3 JF |
804 | copied = msg_pl->sg.size; |
805 | if (!copied) | |
806 | return 0; | |
a42055e8 | 807 | |
d3b18ad3 JF |
808 | return bpf_exec_tx_verdict(msg_pl, sk, true, TLS_RECORD_TYPE_DATA, |
809 | &copied, flags); | |
a42055e8 VG |
810 | } |
811 | ||
812 | int tls_sw_sendmsg(struct sock *sk, struct msghdr *msg, size_t size) | |
813 | { | |
3c4d7559 | 814 | long timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT); |
a42055e8 VG |
815 | struct tls_context *tls_ctx = tls_get_ctx(sk); |
816 | struct tls_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx); | |
817 | struct crypto_tfm *tfm = crypto_aead_tfm(ctx->aead_send); | |
818 | bool async_capable = tfm->__crt_alg->cra_flags & CRYPTO_ALG_ASYNC; | |
819 | unsigned char record_type = TLS_RECORD_TYPE_DATA; | |
00e23707 | 820 | bool is_kvec = iov_iter_is_kvec(&msg->msg_iter); |
3c4d7559 DW |
821 | bool eor = !(msg->msg_flags & MSG_MORE); |
822 | size_t try_to_copy, copied = 0; | |
d829e9c4 | 823 | struct sk_msg *msg_pl, *msg_en; |
a42055e8 VG |
824 | struct tls_rec *rec; |
825 | int required_size; | |
826 | int num_async = 0; | |
3c4d7559 | 827 | bool full_record; |
a42055e8 VG |
828 | int record_room; |
829 | int num_zc = 0; | |
3c4d7559 | 830 | int orig_size; |
4128c0cf | 831 | int ret = 0; |
3c4d7559 DW |
832 | |
833 | if (msg->msg_flags & ~(MSG_MORE | MSG_DONTWAIT | MSG_NOSIGNAL)) | |
834 | return -ENOTSUPP; | |
835 | ||
836 | lock_sock(sk); | |
837 | ||
a42055e8 VG |
838 | /* Wait till there is any pending write on socket */ |
839 | if (unlikely(sk->sk_write_pending)) { | |
840 | ret = wait_on_pending_writer(sk, &timeo); | |
841 | if (unlikely(ret)) | |
842 | goto send_end; | |
843 | } | |
3c4d7559 DW |
844 | |
845 | if (unlikely(msg->msg_controllen)) { | |
846 | ret = tls_proccess_cmsg(sk, msg, &record_type); | |
a42055e8 VG |
847 | if (ret) { |
848 | if (ret == -EINPROGRESS) | |
849 | num_async++; | |
850 | else if (ret != -EAGAIN) | |
851 | goto send_end; | |
852 | } | |
3c4d7559 DW |
853 | } |
854 | ||
855 | while (msg_data_left(msg)) { | |
856 | if (sk->sk_err) { | |
30be8f8d | 857 | ret = -sk->sk_err; |
3c4d7559 DW |
858 | goto send_end; |
859 | } | |
860 | ||
d3b18ad3 JF |
861 | if (ctx->open_rec) |
862 | rec = ctx->open_rec; | |
863 | else | |
864 | rec = ctx->open_rec = tls_get_rec(sk); | |
a42055e8 VG |
865 | if (!rec) { |
866 | ret = -ENOMEM; | |
867 | goto send_end; | |
868 | } | |
869 | ||
d829e9c4 DB |
870 | msg_pl = &rec->msg_plaintext; |
871 | msg_en = &rec->msg_encrypted; | |
872 | ||
873 | orig_size = msg_pl->sg.size; | |
3c4d7559 DW |
874 | full_record = false; |
875 | try_to_copy = msg_data_left(msg); | |
d829e9c4 | 876 | record_room = TLS_MAX_PAYLOAD_SIZE - msg_pl->sg.size; |
3c4d7559 DW |
877 | if (try_to_copy >= record_room) { |
878 | try_to_copy = record_room; | |
879 | full_record = true; | |
880 | } | |
881 | ||
d829e9c4 | 882 | required_size = msg_pl->sg.size + try_to_copy + |
dbe42559 | 883 | tls_ctx->tx.overhead_size; |
3c4d7559 DW |
884 | |
885 | if (!sk_stream_memory_free(sk)) | |
886 | goto wait_for_sndbuf; | |
a42055e8 | 887 | |
3c4d7559 | 888 | alloc_encrypted: |
d829e9c4 | 889 | ret = tls_alloc_encrypted_msg(sk, required_size); |
3c4d7559 DW |
890 | if (ret) { |
891 | if (ret != -ENOSPC) | |
892 | goto wait_for_memory; | |
893 | ||
894 | /* Adjust try_to_copy according to the amount that was | |
895 | * actually allocated. The difference is due | |
896 | * to max sg elements limit | |
897 | */ | |
d829e9c4 | 898 | try_to_copy -= required_size - msg_en->sg.size; |
3c4d7559 DW |
899 | full_record = true; |
900 | } | |
a42055e8 VG |
901 | |
902 | if (!is_kvec && (full_record || eor) && !async_capable) { | |
d3b18ad3 JF |
903 | u32 first = msg_pl->sg.end; |
904 | ||
d829e9c4 DB |
905 | ret = sk_msg_zerocopy_from_iter(sk, &msg->msg_iter, |
906 | msg_pl, try_to_copy); | |
3c4d7559 DW |
907 | if (ret) |
908 | goto fallback_to_reg_send; | |
909 | ||
4e6d4720 VG |
910 | rec->inplace_crypto = 0; |
911 | ||
a42055e8 | 912 | num_zc++; |
3c4d7559 | 913 | copied += try_to_copy; |
d3b18ad3 JF |
914 | |
915 | sk_msg_sg_copy_set(msg_pl, first); | |
916 | ret = bpf_exec_tx_verdict(msg_pl, sk, full_record, | |
917 | record_type, &copied, | |
918 | msg->msg_flags); | |
a42055e8 VG |
919 | if (ret) { |
920 | if (ret == -EINPROGRESS) | |
921 | num_async++; | |
d3b18ad3 JF |
922 | else if (ret == -ENOMEM) |
923 | goto wait_for_memory; | |
924 | else if (ret == -ENOSPC) | |
925 | goto rollback_iter; | |
a42055e8 VG |
926 | else if (ret != -EAGAIN) |
927 | goto send_end; | |
928 | } | |
5a3611ef | 929 | continue; |
d3b18ad3 JF |
930 | rollback_iter: |
931 | copied -= try_to_copy; | |
932 | sk_msg_sg_copy_clear(msg_pl, first); | |
933 | iov_iter_revert(&msg->msg_iter, | |
934 | msg_pl->sg.size - orig_size); | |
3c4d7559 | 935 | fallback_to_reg_send: |
d829e9c4 | 936 | sk_msg_trim(sk, msg_pl, orig_size); |
3c4d7559 DW |
937 | } |
938 | ||
d829e9c4 | 939 | required_size = msg_pl->sg.size + try_to_copy; |
4e6d4720 | 940 | |
d829e9c4 | 941 | ret = tls_clone_plaintext_msg(sk, required_size); |
3c4d7559 DW |
942 | if (ret) { |
943 | if (ret != -ENOSPC) | |
4e6d4720 | 944 | goto send_end; |
3c4d7559 DW |
945 | |
946 | /* Adjust try_to_copy according to the amount that was | |
947 | * actually allocated. The difference is due | |
948 | * to max sg elements limit | |
949 | */ | |
d829e9c4 | 950 | try_to_copy -= required_size - msg_pl->sg.size; |
3c4d7559 | 951 | full_record = true; |
d829e9c4 DB |
952 | sk_msg_trim(sk, msg_en, msg_pl->sg.size + |
953 | tls_ctx->tx.overhead_size); | |
3c4d7559 DW |
954 | } |
955 | ||
65a10e28 VG |
956 | if (try_to_copy) { |
957 | ret = sk_msg_memcopy_from_iter(sk, &msg->msg_iter, | |
958 | msg_pl, try_to_copy); | |
959 | if (ret < 0) | |
960 | goto trim_sgl; | |
961 | } | |
3c4d7559 | 962 | |
d829e9c4 DB |
963 | /* Open records defined only if successfully copied, otherwise |
964 | * we would trim the sg but not reset the open record frags. | |
965 | */ | |
966 | tls_ctx->pending_open_record_frags = true; | |
3c4d7559 DW |
967 | copied += try_to_copy; |
968 | if (full_record || eor) { | |
d3b18ad3 JF |
969 | ret = bpf_exec_tx_verdict(msg_pl, sk, full_record, |
970 | record_type, &copied, | |
971 | msg->msg_flags); | |
3c4d7559 | 972 | if (ret) { |
a42055e8 VG |
973 | if (ret == -EINPROGRESS) |
974 | num_async++; | |
d3b18ad3 JF |
975 | else if (ret == -ENOMEM) |
976 | goto wait_for_memory; | |
977 | else if (ret != -EAGAIN) { | |
978 | if (ret == -ENOSPC) | |
979 | ret = 0; | |
a42055e8 | 980 | goto send_end; |
d3b18ad3 | 981 | } |
3c4d7559 DW |
982 | } |
983 | } | |
984 | ||
985 | continue; | |
986 | ||
987 | wait_for_sndbuf: | |
988 | set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); | |
989 | wait_for_memory: | |
990 | ret = sk_stream_wait_memory(sk, &timeo); | |
991 | if (ret) { | |
992 | trim_sgl: | |
d829e9c4 | 993 | tls_trim_both_msgs(sk, orig_size); |
3c4d7559 DW |
994 | goto send_end; |
995 | } | |
996 | ||
d829e9c4 | 997 | if (msg_en->sg.size < required_size) |
3c4d7559 | 998 | goto alloc_encrypted; |
3c4d7559 DW |
999 | } |
1000 | ||
a42055e8 VG |
1001 | if (!num_async) { |
1002 | goto send_end; | |
1003 | } else if (num_zc) { | |
1004 | /* Wait for pending encryptions to get completed */ | |
1005 | smp_store_mb(ctx->async_notify, true); | |
1006 | ||
1007 | if (atomic_read(&ctx->encrypt_pending)) | |
1008 | crypto_wait_req(-EINPROGRESS, &ctx->async_wait); | |
1009 | else | |
1010 | reinit_completion(&ctx->async_wait.completion); | |
1011 | ||
1012 | WRITE_ONCE(ctx->async_notify, false); | |
1013 | ||
1014 | if (ctx->async_wait.err) { | |
1015 | ret = ctx->async_wait.err; | |
1016 | copied = 0; | |
1017 | } | |
1018 | } | |
1019 | ||
1020 | /* Transmit if any encryptions have completed */ | |
1021 | if (test_and_clear_bit(BIT_TX_SCHEDULED, &ctx->tx_bitmask)) { | |
1022 | cancel_delayed_work(&ctx->tx_work.work); | |
1023 | tls_tx_records(sk, msg->msg_flags); | |
1024 | } | |
1025 | ||
3c4d7559 DW |
1026 | send_end: |
1027 | ret = sk_stream_error(sk, msg->msg_flags, ret); | |
1028 | ||
1029 | release_sock(sk); | |
1030 | return copied ? copied : ret; | |
1031 | } | |
1032 | ||
01cb8a1a Y |
1033 | static int tls_sw_do_sendpage(struct sock *sk, struct page *page, |
1034 | int offset, size_t size, int flags) | |
3c4d7559 | 1035 | { |
a42055e8 | 1036 | long timeo = sock_sndtimeo(sk, flags & MSG_DONTWAIT); |
3c4d7559 | 1037 | struct tls_context *tls_ctx = tls_get_ctx(sk); |
f66de3ee | 1038 | struct tls_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx); |
3c4d7559 | 1039 | unsigned char record_type = TLS_RECORD_TYPE_DATA; |
d829e9c4 | 1040 | struct sk_msg *msg_pl; |
a42055e8 VG |
1041 | struct tls_rec *rec; |
1042 | int num_async = 0; | |
d3b18ad3 | 1043 | size_t copied = 0; |
3c4d7559 DW |
1044 | bool full_record; |
1045 | int record_room; | |
4128c0cf | 1046 | int ret = 0; |
a42055e8 | 1047 | bool eor; |
3c4d7559 | 1048 | |
3c4d7559 | 1049 | eor = !(flags & (MSG_MORE | MSG_SENDPAGE_NOTLAST)); |
3c4d7559 DW |
1050 | sk_clear_bit(SOCKWQ_ASYNC_NOSPACE, sk); |
1051 | ||
a42055e8 VG |
1052 | /* Wait till there is any pending write on socket */ |
1053 | if (unlikely(sk->sk_write_pending)) { | |
1054 | ret = wait_on_pending_writer(sk, &timeo); | |
1055 | if (unlikely(ret)) | |
1056 | goto sendpage_end; | |
1057 | } | |
3c4d7559 DW |
1058 | |
1059 | /* Call the sk_stream functions to manage the sndbuf mem. */ | |
1060 | while (size > 0) { | |
1061 | size_t copy, required_size; | |
1062 | ||
1063 | if (sk->sk_err) { | |
30be8f8d | 1064 | ret = -sk->sk_err; |
3c4d7559 DW |
1065 | goto sendpage_end; |
1066 | } | |
1067 | ||
d3b18ad3 JF |
1068 | if (ctx->open_rec) |
1069 | rec = ctx->open_rec; | |
1070 | else | |
1071 | rec = ctx->open_rec = tls_get_rec(sk); | |
a42055e8 VG |
1072 | if (!rec) { |
1073 | ret = -ENOMEM; | |
1074 | goto sendpage_end; | |
1075 | } | |
1076 | ||
d829e9c4 DB |
1077 | msg_pl = &rec->msg_plaintext; |
1078 | ||
3c4d7559 | 1079 | full_record = false; |
d829e9c4 | 1080 | record_room = TLS_MAX_PAYLOAD_SIZE - msg_pl->sg.size; |
d3b18ad3 | 1081 | copied = 0; |
3c4d7559 DW |
1082 | copy = size; |
1083 | if (copy >= record_room) { | |
1084 | copy = record_room; | |
1085 | full_record = true; | |
1086 | } | |
d829e9c4 DB |
1087 | |
1088 | required_size = msg_pl->sg.size + copy + | |
1089 | tls_ctx->tx.overhead_size; | |
3c4d7559 DW |
1090 | |
1091 | if (!sk_stream_memory_free(sk)) | |
1092 | goto wait_for_sndbuf; | |
1093 | alloc_payload: | |
d829e9c4 | 1094 | ret = tls_alloc_encrypted_msg(sk, required_size); |
3c4d7559 DW |
1095 | if (ret) { |
1096 | if (ret != -ENOSPC) | |
1097 | goto wait_for_memory; | |
1098 | ||
1099 | /* Adjust copy according to the amount that was | |
1100 | * actually allocated. The difference is due | |
1101 | * to max sg elements limit | |
1102 | */ | |
d829e9c4 | 1103 | copy -= required_size - msg_pl->sg.size; |
3c4d7559 DW |
1104 | full_record = true; |
1105 | } | |
1106 | ||
d829e9c4 | 1107 | sk_msg_page_add(msg_pl, page, copy, offset); |
3c4d7559 | 1108 | sk_mem_charge(sk, copy); |
d829e9c4 | 1109 | |
3c4d7559 DW |
1110 | offset += copy; |
1111 | size -= copy; | |
d3b18ad3 | 1112 | copied += copy; |
3c4d7559 | 1113 | |
d829e9c4 DB |
1114 | tls_ctx->pending_open_record_frags = true; |
1115 | if (full_record || eor || sk_msg_full(msg_pl)) { | |
4e6d4720 | 1116 | rec->inplace_crypto = 0; |
d3b18ad3 JF |
1117 | ret = bpf_exec_tx_verdict(msg_pl, sk, full_record, |
1118 | record_type, &copied, flags); | |
3c4d7559 | 1119 | if (ret) { |
a42055e8 VG |
1120 | if (ret == -EINPROGRESS) |
1121 | num_async++; | |
d3b18ad3 JF |
1122 | else if (ret == -ENOMEM) |
1123 | goto wait_for_memory; | |
1124 | else if (ret != -EAGAIN) { | |
1125 | if (ret == -ENOSPC) | |
1126 | ret = 0; | |
a42055e8 | 1127 | goto sendpage_end; |
d3b18ad3 | 1128 | } |
3c4d7559 DW |
1129 | } |
1130 | } | |
1131 | continue; | |
1132 | wait_for_sndbuf: | |
1133 | set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); | |
1134 | wait_for_memory: | |
1135 | ret = sk_stream_wait_memory(sk, &timeo); | |
1136 | if (ret) { | |
d829e9c4 | 1137 | tls_trim_both_msgs(sk, msg_pl->sg.size); |
3c4d7559 DW |
1138 | goto sendpage_end; |
1139 | } | |
1140 | ||
3c4d7559 DW |
1141 | goto alloc_payload; |
1142 | } | |
1143 | ||
a42055e8 VG |
1144 | if (num_async) { |
1145 | /* Transmit if any encryptions have completed */ | |
1146 | if (test_and_clear_bit(BIT_TX_SCHEDULED, &ctx->tx_bitmask)) { | |
1147 | cancel_delayed_work(&ctx->tx_work.work); | |
1148 | tls_tx_records(sk, flags); | |
1149 | } | |
1150 | } | |
3c4d7559 | 1151 | sendpage_end: |
d3b18ad3 | 1152 | ret = sk_stream_error(sk, flags, ret); |
d3b18ad3 | 1153 | return copied ? copied : ret; |
3c4d7559 DW |
1154 | } |
1155 | ||
0608c69c JF |
1156 | int tls_sw_sendpage(struct sock *sk, struct page *page, |
1157 | int offset, size_t size, int flags) | |
1158 | { | |
1159 | int ret; | |
1160 | ||
1161 | if (flags & ~(MSG_MORE | MSG_DONTWAIT | MSG_NOSIGNAL | | |
1162 | MSG_SENDPAGE_NOTLAST | MSG_SENDPAGE_NOPOLICY)) | |
1163 | return -ENOTSUPP; | |
1164 | ||
1165 | lock_sock(sk); | |
1166 | ret = tls_sw_do_sendpage(sk, page, offset, size, flags); | |
1167 | release_sock(sk); | |
1168 | return ret; | |
1169 | } | |
1170 | ||
d3b18ad3 JF |
1171 | static struct sk_buff *tls_wait_data(struct sock *sk, struct sk_psock *psock, |
1172 | int flags, long timeo, int *err) | |
c46234eb DW |
1173 | { |
1174 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
f66de3ee | 1175 | struct tls_sw_context_rx *ctx = tls_sw_ctx_rx(tls_ctx); |
c46234eb DW |
1176 | struct sk_buff *skb; |
1177 | DEFINE_WAIT_FUNC(wait, woken_wake_function); | |
1178 | ||
d3b18ad3 | 1179 | while (!(skb = ctx->recv_pkt) && sk_psock_queue_empty(psock)) { |
c46234eb DW |
1180 | if (sk->sk_err) { |
1181 | *err = sock_error(sk); | |
1182 | return NULL; | |
1183 | } | |
1184 | ||
fcf4793e DRK |
1185 | if (sk->sk_shutdown & RCV_SHUTDOWN) |
1186 | return NULL; | |
1187 | ||
c46234eb DW |
1188 | if (sock_flag(sk, SOCK_DONE)) |
1189 | return NULL; | |
1190 | ||
1191 | if ((flags & MSG_DONTWAIT) || !timeo) { | |
1192 | *err = -EAGAIN; | |
1193 | return NULL; | |
1194 | } | |
1195 | ||
1196 | add_wait_queue(sk_sleep(sk), &wait); | |
1197 | sk_set_bit(SOCKWQ_ASYNC_WAITDATA, sk); | |
d3b18ad3 JF |
1198 | sk_wait_event(sk, &timeo, |
1199 | ctx->recv_pkt != skb || | |
1200 | !sk_psock_queue_empty(psock), | |
1201 | &wait); | |
c46234eb DW |
1202 | sk_clear_bit(SOCKWQ_ASYNC_WAITDATA, sk); |
1203 | remove_wait_queue(sk_sleep(sk), &wait); | |
1204 | ||
1205 | /* Handle signals */ | |
1206 | if (signal_pending(current)) { | |
1207 | *err = sock_intr_errno(timeo); | |
1208 | return NULL; | |
1209 | } | |
1210 | } | |
1211 | ||
1212 | return skb; | |
1213 | } | |
1214 | ||
d829e9c4 DB |
1215 | static int tls_setup_from_iter(struct sock *sk, struct iov_iter *from, |
1216 | int length, int *pages_used, | |
1217 | unsigned int *size_used, | |
1218 | struct scatterlist *to, | |
1219 | int to_max_pages) | |
1220 | { | |
1221 | int rc = 0, i = 0, num_elem = *pages_used, maxpages; | |
1222 | struct page *pages[MAX_SKB_FRAGS]; | |
1223 | unsigned int size = *size_used; | |
1224 | ssize_t copied, use; | |
1225 | size_t offset; | |
1226 | ||
1227 | while (length > 0) { | |
1228 | i = 0; | |
1229 | maxpages = to_max_pages - num_elem; | |
1230 | if (maxpages == 0) { | |
1231 | rc = -EFAULT; | |
1232 | goto out; | |
1233 | } | |
1234 | copied = iov_iter_get_pages(from, pages, | |
1235 | length, | |
1236 | maxpages, &offset); | |
1237 | if (copied <= 0) { | |
1238 | rc = -EFAULT; | |
1239 | goto out; | |
1240 | } | |
1241 | ||
1242 | iov_iter_advance(from, copied); | |
1243 | ||
1244 | length -= copied; | |
1245 | size += copied; | |
1246 | while (copied) { | |
1247 | use = min_t(int, copied, PAGE_SIZE - offset); | |
1248 | ||
1249 | sg_set_page(&to[num_elem], | |
1250 | pages[i], use, offset); | |
1251 | sg_unmark_end(&to[num_elem]); | |
1252 | /* We do not uncharge memory from this API */ | |
1253 | ||
1254 | offset = 0; | |
1255 | copied -= use; | |
1256 | ||
1257 | i++; | |
1258 | num_elem++; | |
1259 | } | |
1260 | } | |
1261 | /* Mark the end in the last sg entry if newly added */ | |
1262 | if (num_elem > *pages_used) | |
1263 | sg_mark_end(&to[num_elem - 1]); | |
1264 | out: | |
1265 | if (rc) | |
1266 | iov_iter_revert(from, size - *size_used); | |
1267 | *size_used = size; | |
1268 | *pages_used = num_elem; | |
1269 | ||
1270 | return rc; | |
1271 | } | |
1272 | ||
0b243d00 VG |
1273 | /* This function decrypts the input skb into either out_iov or in out_sg |
1274 | * or in skb buffers itself. The input parameter 'zc' indicates if | |
1275 | * zero-copy mode needs to be tried or not. With zero-copy mode, either | |
1276 | * out_iov or out_sg must be non-NULL. In case both out_iov and out_sg are | |
1277 | * NULL, then the decryption happens inside skb buffers itself, i.e. | |
1278 | * zero-copy gets disabled and 'zc' is updated. | |
1279 | */ | |
1280 | ||
1281 | static int decrypt_internal(struct sock *sk, struct sk_buff *skb, | |
1282 | struct iov_iter *out_iov, | |
1283 | struct scatterlist *out_sg, | |
692d7b5d | 1284 | int *chunk, bool *zc, bool async) |
0b243d00 VG |
1285 | { |
1286 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
1287 | struct tls_sw_context_rx *ctx = tls_sw_ctx_rx(tls_ctx); | |
1288 | struct strp_msg *rxm = strp_msg(skb); | |
1289 | int n_sgin, n_sgout, nsg, mem_size, aead_size, err, pages = 0; | |
1290 | struct aead_request *aead_req; | |
1291 | struct sk_buff *unused; | |
1292 | u8 *aad, *iv, *mem = NULL; | |
1293 | struct scatterlist *sgin = NULL; | |
1294 | struct scatterlist *sgout = NULL; | |
1295 | const int data_len = rxm->full_len - tls_ctx->rx.overhead_size; | |
1296 | ||
1297 | if (*zc && (out_iov || out_sg)) { | |
1298 | if (out_iov) | |
1299 | n_sgout = iov_iter_npages(out_iov, INT_MAX) + 1; | |
1300 | else | |
1301 | n_sgout = sg_nents(out_sg); | |
0927f71d DRK |
1302 | n_sgin = skb_nsg(skb, rxm->offset + tls_ctx->rx.prepend_size, |
1303 | rxm->full_len - tls_ctx->rx.prepend_size); | |
0b243d00 VG |
1304 | } else { |
1305 | n_sgout = 0; | |
1306 | *zc = false; | |
0927f71d | 1307 | n_sgin = skb_cow_data(skb, 0, &unused); |
0b243d00 VG |
1308 | } |
1309 | ||
0b243d00 VG |
1310 | if (n_sgin < 1) |
1311 | return -EBADMSG; | |
1312 | ||
1313 | /* Increment to accommodate AAD */ | |
1314 | n_sgin = n_sgin + 1; | |
1315 | ||
1316 | nsg = n_sgin + n_sgout; | |
1317 | ||
1318 | aead_size = sizeof(*aead_req) + crypto_aead_reqsize(ctx->aead_recv); | |
1319 | mem_size = aead_size + (nsg * sizeof(struct scatterlist)); | |
a2ef9b6a | 1320 | mem_size = mem_size + tls_ctx->rx.aad_size; |
0b243d00 VG |
1321 | mem_size = mem_size + crypto_aead_ivsize(ctx->aead_recv); |
1322 | ||
1323 | /* Allocate a single block of memory which contains | |
1324 | * aead_req || sgin[] || sgout[] || aad || iv. | |
1325 | * This order achieves correct alignment for aead_req, sgin, sgout. | |
1326 | */ | |
1327 | mem = kmalloc(mem_size, sk->sk_allocation); | |
1328 | if (!mem) | |
1329 | return -ENOMEM; | |
1330 | ||
1331 | /* Segment the allocated memory */ | |
1332 | aead_req = (struct aead_request *)mem; | |
1333 | sgin = (struct scatterlist *)(mem + aead_size); | |
1334 | sgout = sgin + n_sgin; | |
1335 | aad = (u8 *)(sgout + n_sgout); | |
a2ef9b6a | 1336 | iv = aad + tls_ctx->rx.aad_size; |
0b243d00 VG |
1337 | |
1338 | /* Prepare IV */ | |
1339 | err = skb_copy_bits(skb, rxm->offset + TLS_HEADER_SIZE, | |
1340 | iv + TLS_CIPHER_AES_GCM_128_SALT_SIZE, | |
1341 | tls_ctx->rx.iv_size); | |
1342 | if (err < 0) { | |
1343 | kfree(mem); | |
1344 | return err; | |
1345 | } | |
1346 | memcpy(iv, tls_ctx->rx.iv, TLS_CIPHER_AES_GCM_128_SALT_SIZE); | |
1347 | ||
1348 | /* Prepare AAD */ | |
1349 | tls_make_aad(aad, rxm->full_len - tls_ctx->rx.overhead_size, | |
1350 | tls_ctx->rx.rec_seq, tls_ctx->rx.rec_seq_size, | |
1351 | ctx->control); | |
1352 | ||
1353 | /* Prepare sgin */ | |
1354 | sg_init_table(sgin, n_sgin); | |
a2ef9b6a | 1355 | sg_set_buf(&sgin[0], aad, tls_ctx->rx.aad_size); |
0b243d00 VG |
1356 | err = skb_to_sgvec(skb, &sgin[1], |
1357 | rxm->offset + tls_ctx->rx.prepend_size, | |
1358 | rxm->full_len - tls_ctx->rx.prepend_size); | |
1359 | if (err < 0) { | |
1360 | kfree(mem); | |
1361 | return err; | |
1362 | } | |
1363 | ||
1364 | if (n_sgout) { | |
1365 | if (out_iov) { | |
1366 | sg_init_table(sgout, n_sgout); | |
a2ef9b6a | 1367 | sg_set_buf(&sgout[0], aad, tls_ctx->rx.aad_size); |
0b243d00 VG |
1368 | |
1369 | *chunk = 0; | |
d829e9c4 DB |
1370 | err = tls_setup_from_iter(sk, out_iov, data_len, |
1371 | &pages, chunk, &sgout[1], | |
1372 | (n_sgout - 1)); | |
0b243d00 VG |
1373 | if (err < 0) |
1374 | goto fallback_to_reg_recv; | |
1375 | } else if (out_sg) { | |
1376 | memcpy(sgout, out_sg, n_sgout * sizeof(*sgout)); | |
1377 | } else { | |
1378 | goto fallback_to_reg_recv; | |
1379 | } | |
1380 | } else { | |
1381 | fallback_to_reg_recv: | |
1382 | sgout = sgin; | |
1383 | pages = 0; | |
692d7b5d | 1384 | *chunk = data_len; |
0b243d00 VG |
1385 | *zc = false; |
1386 | } | |
1387 | ||
1388 | /* Prepare and submit AEAD request */ | |
94524d8f | 1389 | err = tls_do_decryption(sk, skb, sgin, sgout, iv, |
692d7b5d | 1390 | data_len, aead_req, async); |
94524d8f VG |
1391 | if (err == -EINPROGRESS) |
1392 | return err; | |
0b243d00 VG |
1393 | |
1394 | /* Release the pages in case iov was mapped to pages */ | |
1395 | for (; pages > 0; pages--) | |
1396 | put_page(sg_page(&sgout[pages])); | |
1397 | ||
1398 | kfree(mem); | |
1399 | return err; | |
1400 | } | |
1401 | ||
dafb67f3 | 1402 | static int decrypt_skb_update(struct sock *sk, struct sk_buff *skb, |
692d7b5d VG |
1403 | struct iov_iter *dest, int *chunk, bool *zc, |
1404 | bool async) | |
dafb67f3 BP |
1405 | { |
1406 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
1407 | struct tls_sw_context_rx *ctx = tls_sw_ctx_rx(tls_ctx); | |
1408 | struct strp_msg *rxm = strp_msg(skb); | |
1409 | int err = 0; | |
1410 | ||
4799ac81 BP |
1411 | #ifdef CONFIG_TLS_DEVICE |
1412 | err = tls_device_decrypted(sk, skb); | |
dafb67f3 BP |
1413 | if (err < 0) |
1414 | return err; | |
4799ac81 BP |
1415 | #endif |
1416 | if (!ctx->decrypted) { | |
692d7b5d | 1417 | err = decrypt_internal(sk, skb, dest, NULL, chunk, zc, async); |
94524d8f VG |
1418 | if (err < 0) { |
1419 | if (err == -EINPROGRESS) | |
1420 | tls_advance_record_sn(sk, &tls_ctx->rx); | |
1421 | ||
4799ac81 | 1422 | return err; |
94524d8f | 1423 | } |
4799ac81 BP |
1424 | } else { |
1425 | *zc = false; | |
1426 | } | |
dafb67f3 BP |
1427 | |
1428 | rxm->offset += tls_ctx->rx.prepend_size; | |
1429 | rxm->full_len -= tls_ctx->rx.overhead_size; | |
1430 | tls_advance_record_sn(sk, &tls_ctx->rx); | |
1431 | ctx->decrypted = true; | |
1432 | ctx->saved_data_ready(sk); | |
1433 | ||
1434 | return err; | |
1435 | } | |
1436 | ||
1437 | int decrypt_skb(struct sock *sk, struct sk_buff *skb, | |
1438 | struct scatterlist *sgout) | |
c46234eb | 1439 | { |
0b243d00 VG |
1440 | bool zc = true; |
1441 | int chunk; | |
c46234eb | 1442 | |
692d7b5d | 1443 | return decrypt_internal(sk, skb, NULL, sgout, &chunk, &zc, false); |
c46234eb DW |
1444 | } |
1445 | ||
1446 | static bool tls_sw_advance_skb(struct sock *sk, struct sk_buff *skb, | |
1447 | unsigned int len) | |
1448 | { | |
1449 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
f66de3ee | 1450 | struct tls_sw_context_rx *ctx = tls_sw_ctx_rx(tls_ctx); |
c46234eb | 1451 | |
94524d8f VG |
1452 | if (skb) { |
1453 | struct strp_msg *rxm = strp_msg(skb); | |
c46234eb | 1454 | |
94524d8f VG |
1455 | if (len < rxm->full_len) { |
1456 | rxm->offset += len; | |
1457 | rxm->full_len -= len; | |
1458 | return false; | |
1459 | } | |
1460 | kfree_skb(skb); | |
c46234eb DW |
1461 | } |
1462 | ||
1463 | /* Finished with message */ | |
1464 | ctx->recv_pkt = NULL; | |
7170e604 | 1465 | __strp_unpause(&ctx->strp); |
c46234eb DW |
1466 | |
1467 | return true; | |
1468 | } | |
1469 | ||
692d7b5d VG |
1470 | /* This function traverses the rx_list in tls receive context to copies the |
1471 | * decrypted data records into the buffer provided by caller zero copy is not | |
1472 | * true. Further, the records are removed from the rx_list if it is not a peek | |
1473 | * case and the record has been consumed completely. | |
1474 | */ | |
1475 | static int process_rx_list(struct tls_sw_context_rx *ctx, | |
1476 | struct msghdr *msg, | |
1477 | size_t skip, | |
1478 | size_t len, | |
1479 | bool zc, | |
1480 | bool is_peek) | |
1481 | { | |
1482 | struct sk_buff *skb = skb_peek(&ctx->rx_list); | |
1483 | ssize_t copied = 0; | |
1484 | ||
1485 | while (skip && skb) { | |
1486 | struct strp_msg *rxm = strp_msg(skb); | |
1487 | ||
1488 | if (skip < rxm->full_len) | |
1489 | break; | |
1490 | ||
1491 | skip = skip - rxm->full_len; | |
1492 | skb = skb_peek_next(skb, &ctx->rx_list); | |
1493 | } | |
1494 | ||
1495 | while (len && skb) { | |
1496 | struct sk_buff *next_skb; | |
1497 | struct strp_msg *rxm = strp_msg(skb); | |
1498 | int chunk = min_t(unsigned int, rxm->full_len - skip, len); | |
1499 | ||
1500 | if (!zc || (rxm->full_len - skip) > len) { | |
1501 | int err = skb_copy_datagram_msg(skb, rxm->offset + skip, | |
1502 | msg, chunk); | |
1503 | if (err < 0) | |
1504 | return err; | |
1505 | } | |
1506 | ||
1507 | len = len - chunk; | |
1508 | copied = copied + chunk; | |
1509 | ||
1510 | /* Consume the data from record if it is non-peek case*/ | |
1511 | if (!is_peek) { | |
1512 | rxm->offset = rxm->offset + chunk; | |
1513 | rxm->full_len = rxm->full_len - chunk; | |
1514 | ||
1515 | /* Return if there is unconsumed data in the record */ | |
1516 | if (rxm->full_len - skip) | |
1517 | break; | |
1518 | } | |
1519 | ||
1520 | /* The remaining skip-bytes must lie in 1st record in rx_list. | |
1521 | * So from the 2nd record, 'skip' should be 0. | |
1522 | */ | |
1523 | skip = 0; | |
1524 | ||
1525 | if (msg) | |
1526 | msg->msg_flags |= MSG_EOR; | |
1527 | ||
1528 | next_skb = skb_peek_next(skb, &ctx->rx_list); | |
1529 | ||
1530 | if (!is_peek) { | |
1531 | skb_unlink(skb, &ctx->rx_list); | |
1532 | kfree_skb(skb); | |
1533 | } | |
1534 | ||
1535 | skb = next_skb; | |
1536 | } | |
1537 | ||
1538 | return copied; | |
1539 | } | |
1540 | ||
c46234eb DW |
1541 | int tls_sw_recvmsg(struct sock *sk, |
1542 | struct msghdr *msg, | |
1543 | size_t len, | |
1544 | int nonblock, | |
1545 | int flags, | |
1546 | int *addr_len) | |
1547 | { | |
1548 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
f66de3ee | 1549 | struct tls_sw_context_rx *ctx = tls_sw_ctx_rx(tls_ctx); |
d3b18ad3 | 1550 | struct sk_psock *psock; |
692d7b5d VG |
1551 | unsigned char control = 0; |
1552 | ssize_t decrypted = 0; | |
c46234eb DW |
1553 | struct strp_msg *rxm; |
1554 | struct sk_buff *skb; | |
1555 | ssize_t copied = 0; | |
1556 | bool cmsg = false; | |
06030dba | 1557 | int target, err = 0; |
c46234eb | 1558 | long timeo; |
00e23707 | 1559 | bool is_kvec = iov_iter_is_kvec(&msg->msg_iter); |
692d7b5d | 1560 | bool is_peek = flags & MSG_PEEK; |
94524d8f | 1561 | int num_async = 0; |
c46234eb DW |
1562 | |
1563 | flags |= nonblock; | |
1564 | ||
1565 | if (unlikely(flags & MSG_ERRQUEUE)) | |
1566 | return sock_recv_errqueue(sk, msg, len, SOL_IP, IP_RECVERR); | |
1567 | ||
d3b18ad3 | 1568 | psock = sk_psock_get(sk); |
c46234eb DW |
1569 | lock_sock(sk); |
1570 | ||
692d7b5d VG |
1571 | /* Process pending decrypted records. It must be non-zero-copy */ |
1572 | err = process_rx_list(ctx, msg, 0, len, false, is_peek); | |
1573 | if (err < 0) { | |
1574 | tls_err_abort(sk, err); | |
1575 | goto end; | |
1576 | } else { | |
1577 | copied = err; | |
1578 | } | |
1579 | ||
1580 | len = len - copied; | |
1581 | if (len) { | |
1582 | target = sock_rcvlowat(sk, flags & MSG_WAITALL, len); | |
1583 | timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT); | |
1584 | } else { | |
1585 | goto recv_end; | |
1586 | } | |
1587 | ||
c46234eb | 1588 | do { |
692d7b5d | 1589 | bool retain_skb = false; |
94524d8f | 1590 | bool async = false; |
692d7b5d VG |
1591 | bool zc = false; |
1592 | int to_decrypt; | |
c46234eb DW |
1593 | int chunk = 0; |
1594 | ||
d3b18ad3 JF |
1595 | skb = tls_wait_data(sk, psock, flags, timeo, &err); |
1596 | if (!skb) { | |
1597 | if (psock) { | |
02c558b2 JF |
1598 | int ret = __tcp_bpf_recvmsg(sk, psock, |
1599 | msg, len, flags); | |
d3b18ad3 JF |
1600 | |
1601 | if (ret > 0) { | |
692d7b5d | 1602 | decrypted += ret; |
d3b18ad3 JF |
1603 | len -= ret; |
1604 | continue; | |
1605 | } | |
1606 | } | |
c46234eb | 1607 | goto recv_end; |
d3b18ad3 | 1608 | } |
c46234eb DW |
1609 | |
1610 | rxm = strp_msg(skb); | |
94524d8f | 1611 | |
c46234eb DW |
1612 | if (!cmsg) { |
1613 | int cerr; | |
1614 | ||
1615 | cerr = put_cmsg(msg, SOL_TLS, TLS_GET_RECORD_TYPE, | |
1616 | sizeof(ctx->control), &ctx->control); | |
1617 | cmsg = true; | |
1618 | control = ctx->control; | |
1619 | if (ctx->control != TLS_RECORD_TYPE_DATA) { | |
1620 | if (cerr || msg->msg_flags & MSG_CTRUNC) { | |
1621 | err = -EIO; | |
1622 | goto recv_end; | |
1623 | } | |
1624 | } | |
1625 | } else if (control != ctx->control) { | |
1626 | goto recv_end; | |
1627 | } | |
1628 | ||
692d7b5d | 1629 | to_decrypt = rxm->full_len - tls_ctx->rx.overhead_size; |
c46234eb | 1630 | |
692d7b5d VG |
1631 | if (to_decrypt <= len && !is_kvec && !is_peek) |
1632 | zc = true; | |
0b243d00 | 1633 | |
692d7b5d VG |
1634 | err = decrypt_skb_update(sk, skb, &msg->msg_iter, |
1635 | &chunk, &zc, ctx->async_capable); | |
1636 | if (err < 0 && err != -EINPROGRESS) { | |
1637 | tls_err_abort(sk, EBADMSG); | |
1638 | goto recv_end; | |
c46234eb DW |
1639 | } |
1640 | ||
692d7b5d VG |
1641 | if (err == -EINPROGRESS) { |
1642 | async = true; | |
1643 | num_async++; | |
1644 | goto pick_next_record; | |
1645 | } else { | |
1646 | if (!zc) { | |
1647 | if (rxm->full_len > len) { | |
1648 | retain_skb = true; | |
1649 | chunk = len; | |
1650 | } else { | |
1651 | chunk = rxm->full_len; | |
1652 | } | |
1653 | ||
1654 | err = skb_copy_datagram_msg(skb, rxm->offset, | |
1655 | msg, chunk); | |
1656 | if (err < 0) | |
1657 | goto recv_end; | |
94524d8f | 1658 | |
692d7b5d VG |
1659 | if (!is_peek) { |
1660 | rxm->offset = rxm->offset + chunk; | |
1661 | rxm->full_len = rxm->full_len - chunk; | |
1662 | } | |
1663 | } | |
c46234eb DW |
1664 | } |
1665 | ||
94524d8f | 1666 | pick_next_record: |
692d7b5d VG |
1667 | if (chunk > len) |
1668 | chunk = len; | |
1669 | ||
1670 | decrypted += chunk; | |
c46234eb | 1671 | len -= chunk; |
692d7b5d VG |
1672 | |
1673 | /* For async or peek case, queue the current skb */ | |
1674 | if (async || is_peek || retain_skb) { | |
1675 | skb_queue_tail(&ctx->rx_list, skb); | |
1676 | skb = NULL; | |
1677 | } | |
1678 | ||
1679 | if (tls_sw_advance_skb(sk, skb, chunk)) { | |
1680 | /* Return full control message to | |
1681 | * userspace before trying to parse | |
1682 | * another message type | |
50c6b58a | 1683 | */ |
692d7b5d VG |
1684 | msg->msg_flags |= MSG_EOR; |
1685 | if (ctx->control != TLS_RECORD_TYPE_DATA) | |
1686 | goto recv_end; | |
1687 | } else { | |
50c6b58a | 1688 | break; |
c46234eb | 1689 | } |
94524d8f | 1690 | |
06030dba | 1691 | /* If we have a new message from strparser, continue now. */ |
692d7b5d | 1692 | if (decrypted >= target && !ctx->recv_pkt) |
06030dba | 1693 | break; |
c46234eb DW |
1694 | } while (len); |
1695 | ||
1696 | recv_end: | |
94524d8f VG |
1697 | if (num_async) { |
1698 | /* Wait for all previously submitted records to be decrypted */ | |
1699 | smp_store_mb(ctx->async_notify, true); | |
1700 | if (atomic_read(&ctx->decrypt_pending)) { | |
1701 | err = crypto_wait_req(-EINPROGRESS, &ctx->async_wait); | |
1702 | if (err) { | |
1703 | /* one of async decrypt failed */ | |
1704 | tls_err_abort(sk, err); | |
1705 | copied = 0; | |
692d7b5d VG |
1706 | decrypted = 0; |
1707 | goto end; | |
94524d8f VG |
1708 | } |
1709 | } else { | |
1710 | reinit_completion(&ctx->async_wait.completion); | |
1711 | } | |
1712 | WRITE_ONCE(ctx->async_notify, false); | |
692d7b5d VG |
1713 | |
1714 | /* Drain records from the rx_list & copy if required */ | |
1715 | if (is_peek || is_kvec) | |
1716 | err = process_rx_list(ctx, msg, copied, | |
1717 | decrypted, false, is_peek); | |
1718 | else | |
1719 | err = process_rx_list(ctx, msg, 0, | |
1720 | decrypted, true, is_peek); | |
1721 | if (err < 0) { | |
1722 | tls_err_abort(sk, err); | |
1723 | copied = 0; | |
1724 | goto end; | |
1725 | } | |
1726 | ||
1727 | WARN_ON(decrypted != err); | |
94524d8f VG |
1728 | } |
1729 | ||
692d7b5d VG |
1730 | copied += decrypted; |
1731 | ||
1732 | end: | |
c46234eb | 1733 | release_sock(sk); |
d3b18ad3 JF |
1734 | if (psock) |
1735 | sk_psock_put(sk, psock); | |
c46234eb DW |
1736 | return copied ? : err; |
1737 | } | |
1738 | ||
1739 | ssize_t tls_sw_splice_read(struct socket *sock, loff_t *ppos, | |
1740 | struct pipe_inode_info *pipe, | |
1741 | size_t len, unsigned int flags) | |
1742 | { | |
1743 | struct tls_context *tls_ctx = tls_get_ctx(sock->sk); | |
f66de3ee | 1744 | struct tls_sw_context_rx *ctx = tls_sw_ctx_rx(tls_ctx); |
c46234eb DW |
1745 | struct strp_msg *rxm = NULL; |
1746 | struct sock *sk = sock->sk; | |
1747 | struct sk_buff *skb; | |
1748 | ssize_t copied = 0; | |
1749 | int err = 0; | |
1750 | long timeo; | |
1751 | int chunk; | |
0b243d00 | 1752 | bool zc = false; |
c46234eb DW |
1753 | |
1754 | lock_sock(sk); | |
1755 | ||
1756 | timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT); | |
1757 | ||
d3b18ad3 | 1758 | skb = tls_wait_data(sk, NULL, flags, timeo, &err); |
c46234eb DW |
1759 | if (!skb) |
1760 | goto splice_read_end; | |
1761 | ||
1762 | /* splice does not support reading control messages */ | |
1763 | if (ctx->control != TLS_RECORD_TYPE_DATA) { | |
1764 | err = -ENOTSUPP; | |
1765 | goto splice_read_end; | |
1766 | } | |
1767 | ||
1768 | if (!ctx->decrypted) { | |
692d7b5d | 1769 | err = decrypt_skb_update(sk, skb, NULL, &chunk, &zc, false); |
c46234eb DW |
1770 | |
1771 | if (err < 0) { | |
1772 | tls_err_abort(sk, EBADMSG); | |
1773 | goto splice_read_end; | |
1774 | } | |
1775 | ctx->decrypted = true; | |
1776 | } | |
1777 | rxm = strp_msg(skb); | |
1778 | ||
1779 | chunk = min_t(unsigned int, rxm->full_len, len); | |
1780 | copied = skb_splice_bits(skb, sk, rxm->offset, pipe, chunk, flags); | |
1781 | if (copied < 0) | |
1782 | goto splice_read_end; | |
1783 | ||
1784 | if (likely(!(flags & MSG_PEEK))) | |
1785 | tls_sw_advance_skb(sk, skb, copied); | |
1786 | ||
1787 | splice_read_end: | |
1788 | release_sock(sk); | |
1789 | return copied ? : err; | |
1790 | } | |
1791 | ||
924ad65e | 1792 | bool tls_sw_stream_read(const struct sock *sk) |
c46234eb | 1793 | { |
c46234eb | 1794 | struct tls_context *tls_ctx = tls_get_ctx(sk); |
f66de3ee | 1795 | struct tls_sw_context_rx *ctx = tls_sw_ctx_rx(tls_ctx); |
d3b18ad3 JF |
1796 | bool ingress_empty = true; |
1797 | struct sk_psock *psock; | |
c46234eb | 1798 | |
d3b18ad3 JF |
1799 | rcu_read_lock(); |
1800 | psock = sk_psock(sk); | |
1801 | if (psock) | |
1802 | ingress_empty = list_empty(&psock->ingress_msg); | |
1803 | rcu_read_unlock(); | |
c46234eb | 1804 | |
d3b18ad3 | 1805 | return !ingress_empty || ctx->recv_pkt; |
c46234eb DW |
1806 | } |
1807 | ||
1808 | static int tls_read_size(struct strparser *strp, struct sk_buff *skb) | |
1809 | { | |
1810 | struct tls_context *tls_ctx = tls_get_ctx(strp->sk); | |
f66de3ee | 1811 | struct tls_sw_context_rx *ctx = tls_sw_ctx_rx(tls_ctx); |
3463e51d | 1812 | char header[TLS_HEADER_SIZE + MAX_IV_SIZE]; |
c46234eb DW |
1813 | struct strp_msg *rxm = strp_msg(skb); |
1814 | size_t cipher_overhead; | |
1815 | size_t data_len = 0; | |
1816 | int ret; | |
1817 | ||
1818 | /* Verify that we have a full TLS header, or wait for more data */ | |
1819 | if (rxm->offset + tls_ctx->rx.prepend_size > skb->len) | |
1820 | return 0; | |
1821 | ||
3463e51d KC |
1822 | /* Sanity-check size of on-stack buffer. */ |
1823 | if (WARN_ON(tls_ctx->rx.prepend_size > sizeof(header))) { | |
1824 | ret = -EINVAL; | |
1825 | goto read_failure; | |
1826 | } | |
1827 | ||
c46234eb DW |
1828 | /* Linearize header to local buffer */ |
1829 | ret = skb_copy_bits(skb, rxm->offset, header, tls_ctx->rx.prepend_size); | |
1830 | ||
1831 | if (ret < 0) | |
1832 | goto read_failure; | |
1833 | ||
1834 | ctx->control = header[0]; | |
1835 | ||
1836 | data_len = ((header[4] & 0xFF) | (header[3] << 8)); | |
1837 | ||
1838 | cipher_overhead = tls_ctx->rx.tag_size + tls_ctx->rx.iv_size; | |
1839 | ||
1840 | if (data_len > TLS_MAX_PAYLOAD_SIZE + cipher_overhead) { | |
1841 | ret = -EMSGSIZE; | |
1842 | goto read_failure; | |
1843 | } | |
1844 | if (data_len < cipher_overhead) { | |
1845 | ret = -EBADMSG; | |
1846 | goto read_failure; | |
1847 | } | |
1848 | ||
86029d10 SD |
1849 | if (header[1] != TLS_VERSION_MINOR(tls_ctx->crypto_recv.info.version) || |
1850 | header[2] != TLS_VERSION_MAJOR(tls_ctx->crypto_recv.info.version)) { | |
c46234eb DW |
1851 | ret = -EINVAL; |
1852 | goto read_failure; | |
1853 | } | |
1854 | ||
4799ac81 BP |
1855 | #ifdef CONFIG_TLS_DEVICE |
1856 | handle_device_resync(strp->sk, TCP_SKB_CB(skb)->seq + rxm->offset, | |
1857 | *(u64*)tls_ctx->rx.rec_seq); | |
1858 | #endif | |
c46234eb DW |
1859 | return data_len + TLS_HEADER_SIZE; |
1860 | ||
1861 | read_failure: | |
1862 | tls_err_abort(strp->sk, ret); | |
1863 | ||
1864 | return ret; | |
1865 | } | |
1866 | ||
1867 | static void tls_queue(struct strparser *strp, struct sk_buff *skb) | |
1868 | { | |
1869 | struct tls_context *tls_ctx = tls_get_ctx(strp->sk); | |
f66de3ee | 1870 | struct tls_sw_context_rx *ctx = tls_sw_ctx_rx(tls_ctx); |
c46234eb DW |
1871 | |
1872 | ctx->decrypted = false; | |
1873 | ||
1874 | ctx->recv_pkt = skb; | |
1875 | strp_pause(strp); | |
1876 | ||
ad13acce | 1877 | ctx->saved_data_ready(strp->sk); |
c46234eb DW |
1878 | } |
1879 | ||
1880 | static void tls_data_ready(struct sock *sk) | |
1881 | { | |
1882 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
f66de3ee | 1883 | struct tls_sw_context_rx *ctx = tls_sw_ctx_rx(tls_ctx); |
d3b18ad3 | 1884 | struct sk_psock *psock; |
c46234eb DW |
1885 | |
1886 | strp_data_ready(&ctx->strp); | |
d3b18ad3 JF |
1887 | |
1888 | psock = sk_psock_get(sk); | |
1889 | if (psock && !list_empty(&psock->ingress_msg)) { | |
1890 | ctx->saved_data_ready(sk); | |
1891 | sk_psock_put(sk, psock); | |
1892 | } | |
c46234eb DW |
1893 | } |
1894 | ||
f66de3ee | 1895 | void tls_sw_free_resources_tx(struct sock *sk) |
3c4d7559 DW |
1896 | { |
1897 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
f66de3ee | 1898 | struct tls_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx); |
a42055e8 VG |
1899 | struct tls_rec *rec, *tmp; |
1900 | ||
1901 | /* Wait for any pending async encryptions to complete */ | |
1902 | smp_store_mb(ctx->async_notify, true); | |
1903 | if (atomic_read(&ctx->encrypt_pending)) | |
1904 | crypto_wait_req(-EINPROGRESS, &ctx->async_wait); | |
1905 | ||
10231213 | 1906 | release_sock(sk); |
a42055e8 | 1907 | cancel_delayed_work_sync(&ctx->tx_work.work); |
10231213 | 1908 | lock_sock(sk); |
a42055e8 VG |
1909 | |
1910 | /* Tx whatever records we can transmit and abandon the rest */ | |
1911 | tls_tx_records(sk, -1); | |
1912 | ||
9932a29a | 1913 | /* Free up un-sent records in tx_list. First, free |
a42055e8 VG |
1914 | * the partially sent record if any at head of tx_list. |
1915 | */ | |
1916 | if (tls_ctx->partially_sent_record) { | |
1917 | struct scatterlist *sg = tls_ctx->partially_sent_record; | |
1918 | ||
1919 | while (1) { | |
1920 | put_page(sg_page(sg)); | |
1921 | sk_mem_uncharge(sk, sg->length); | |
1922 | ||
1923 | if (sg_is_last(sg)) | |
1924 | break; | |
1925 | sg++; | |
1926 | } | |
1927 | ||
1928 | tls_ctx->partially_sent_record = NULL; | |
1929 | ||
9932a29a | 1930 | rec = list_first_entry(&ctx->tx_list, |
a42055e8 VG |
1931 | struct tls_rec, list); |
1932 | list_del(&rec->list); | |
d829e9c4 | 1933 | sk_msg_free(sk, &rec->msg_plaintext); |
a42055e8 VG |
1934 | kfree(rec); |
1935 | } | |
1936 | ||
9932a29a | 1937 | list_for_each_entry_safe(rec, tmp, &ctx->tx_list, list) { |
a42055e8 | 1938 | list_del(&rec->list); |
d829e9c4 DB |
1939 | sk_msg_free(sk, &rec->msg_encrypted); |
1940 | sk_msg_free(sk, &rec->msg_plaintext); | |
a42055e8 VG |
1941 | kfree(rec); |
1942 | } | |
3c4d7559 | 1943 | |
201876b3 | 1944 | crypto_free_aead(ctx->aead_send); |
c774973e | 1945 | tls_free_open_rec(sk); |
f66de3ee BP |
1946 | |
1947 | kfree(ctx); | |
1948 | } | |
1949 | ||
39f56e1a | 1950 | void tls_sw_release_resources_rx(struct sock *sk) |
f66de3ee BP |
1951 | { |
1952 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
1953 | struct tls_sw_context_rx *ctx = tls_sw_ctx_rx(tls_ctx); | |
1954 | ||
c46234eb | 1955 | if (ctx->aead_recv) { |
201876b3 VG |
1956 | kfree_skb(ctx->recv_pkt); |
1957 | ctx->recv_pkt = NULL; | |
692d7b5d | 1958 | skb_queue_purge(&ctx->rx_list); |
c46234eb DW |
1959 | crypto_free_aead(ctx->aead_recv); |
1960 | strp_stop(&ctx->strp); | |
1961 | write_lock_bh(&sk->sk_callback_lock); | |
1962 | sk->sk_data_ready = ctx->saved_data_ready; | |
1963 | write_unlock_bh(&sk->sk_callback_lock); | |
1964 | release_sock(sk); | |
1965 | strp_done(&ctx->strp); | |
1966 | lock_sock(sk); | |
1967 | } | |
39f56e1a BP |
1968 | } |
1969 | ||
1970 | void tls_sw_free_resources_rx(struct sock *sk) | |
1971 | { | |
1972 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
1973 | struct tls_sw_context_rx *ctx = tls_sw_ctx_rx(tls_ctx); | |
1974 | ||
1975 | tls_sw_release_resources_rx(sk); | |
3c4d7559 | 1976 | |
3c4d7559 DW |
1977 | kfree(ctx); |
1978 | } | |
1979 | ||
9932a29a | 1980 | /* The work handler to transmitt the encrypted records in tx_list */ |
a42055e8 VG |
1981 | static void tx_work_handler(struct work_struct *work) |
1982 | { | |
1983 | struct delayed_work *delayed_work = to_delayed_work(work); | |
1984 | struct tx_work *tx_work = container_of(delayed_work, | |
1985 | struct tx_work, work); | |
1986 | struct sock *sk = tx_work->sk; | |
1987 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
1988 | struct tls_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx); | |
1989 | ||
1990 | if (!test_and_clear_bit(BIT_TX_SCHEDULED, &ctx->tx_bitmask)) | |
1991 | return; | |
1992 | ||
1993 | lock_sock(sk); | |
1994 | tls_tx_records(sk, -1); | |
1995 | release_sock(sk); | |
1996 | } | |
1997 | ||
c46234eb | 1998 | int tls_set_sw_offload(struct sock *sk, struct tls_context *ctx, int tx) |
3c4d7559 | 1999 | { |
3c4d7559 DW |
2000 | struct tls_crypto_info *crypto_info; |
2001 | struct tls12_crypto_info_aes_gcm_128 *gcm_128_info; | |
fb99bce7 | 2002 | struct tls12_crypto_info_aes_gcm_256 *gcm_256_info; |
f66de3ee BP |
2003 | struct tls_sw_context_tx *sw_ctx_tx = NULL; |
2004 | struct tls_sw_context_rx *sw_ctx_rx = NULL; | |
c46234eb DW |
2005 | struct cipher_context *cctx; |
2006 | struct crypto_aead **aead; | |
2007 | struct strp_callbacks cb; | |
3c4d7559 | 2008 | u16 nonce_size, tag_size, iv_size, rec_seq_size; |
692d7b5d | 2009 | struct crypto_tfm *tfm; |
fb99bce7 DW |
2010 | char *iv, *rec_seq, *key, *salt; |
2011 | size_t keysize; | |
3c4d7559 DW |
2012 | int rc = 0; |
2013 | ||
2014 | if (!ctx) { | |
2015 | rc = -EINVAL; | |
2016 | goto out; | |
2017 | } | |
2018 | ||
f66de3ee | 2019 | if (tx) { |
b190a587 BP |
2020 | if (!ctx->priv_ctx_tx) { |
2021 | sw_ctx_tx = kzalloc(sizeof(*sw_ctx_tx), GFP_KERNEL); | |
2022 | if (!sw_ctx_tx) { | |
2023 | rc = -ENOMEM; | |
2024 | goto out; | |
2025 | } | |
2026 | ctx->priv_ctx_tx = sw_ctx_tx; | |
2027 | } else { | |
2028 | sw_ctx_tx = | |
2029 | (struct tls_sw_context_tx *)ctx->priv_ctx_tx; | |
c46234eb | 2030 | } |
c46234eb | 2031 | } else { |
b190a587 BP |
2032 | if (!ctx->priv_ctx_rx) { |
2033 | sw_ctx_rx = kzalloc(sizeof(*sw_ctx_rx), GFP_KERNEL); | |
2034 | if (!sw_ctx_rx) { | |
2035 | rc = -ENOMEM; | |
2036 | goto out; | |
2037 | } | |
2038 | ctx->priv_ctx_rx = sw_ctx_rx; | |
2039 | } else { | |
2040 | sw_ctx_rx = | |
2041 | (struct tls_sw_context_rx *)ctx->priv_ctx_rx; | |
f66de3ee | 2042 | } |
3c4d7559 DW |
2043 | } |
2044 | ||
c46234eb | 2045 | if (tx) { |
b190a587 | 2046 | crypto_init_wait(&sw_ctx_tx->async_wait); |
86029d10 | 2047 | crypto_info = &ctx->crypto_send.info; |
c46234eb | 2048 | cctx = &ctx->tx; |
f66de3ee | 2049 | aead = &sw_ctx_tx->aead_send; |
9932a29a | 2050 | INIT_LIST_HEAD(&sw_ctx_tx->tx_list); |
a42055e8 VG |
2051 | INIT_DELAYED_WORK(&sw_ctx_tx->tx_work.work, tx_work_handler); |
2052 | sw_ctx_tx->tx_work.sk = sk; | |
c46234eb | 2053 | } else { |
b190a587 | 2054 | crypto_init_wait(&sw_ctx_rx->async_wait); |
86029d10 | 2055 | crypto_info = &ctx->crypto_recv.info; |
c46234eb | 2056 | cctx = &ctx->rx; |
692d7b5d | 2057 | skb_queue_head_init(&sw_ctx_rx->rx_list); |
f66de3ee | 2058 | aead = &sw_ctx_rx->aead_recv; |
c46234eb DW |
2059 | } |
2060 | ||
3c4d7559 DW |
2061 | switch (crypto_info->cipher_type) { |
2062 | case TLS_CIPHER_AES_GCM_128: { | |
2063 | nonce_size = TLS_CIPHER_AES_GCM_128_IV_SIZE; | |
2064 | tag_size = TLS_CIPHER_AES_GCM_128_TAG_SIZE; | |
2065 | iv_size = TLS_CIPHER_AES_GCM_128_IV_SIZE; | |
2066 | iv = ((struct tls12_crypto_info_aes_gcm_128 *)crypto_info)->iv; | |
2067 | rec_seq_size = TLS_CIPHER_AES_GCM_128_REC_SEQ_SIZE; | |
2068 | rec_seq = | |
2069 | ((struct tls12_crypto_info_aes_gcm_128 *)crypto_info)->rec_seq; | |
2070 | gcm_128_info = | |
2071 | (struct tls12_crypto_info_aes_gcm_128 *)crypto_info; | |
fb99bce7 DW |
2072 | keysize = TLS_CIPHER_AES_GCM_128_KEY_SIZE; |
2073 | key = gcm_128_info->key; | |
2074 | salt = gcm_128_info->salt; | |
2075 | break; | |
2076 | } | |
2077 | case TLS_CIPHER_AES_GCM_256: { | |
2078 | nonce_size = TLS_CIPHER_AES_GCM_256_IV_SIZE; | |
2079 | tag_size = TLS_CIPHER_AES_GCM_256_TAG_SIZE; | |
2080 | iv_size = TLS_CIPHER_AES_GCM_256_IV_SIZE; | |
2081 | iv = ((struct tls12_crypto_info_aes_gcm_256 *)crypto_info)->iv; | |
2082 | rec_seq_size = TLS_CIPHER_AES_GCM_256_REC_SEQ_SIZE; | |
2083 | rec_seq = | |
2084 | ((struct tls12_crypto_info_aes_gcm_256 *)crypto_info)->rec_seq; | |
2085 | gcm_256_info = | |
2086 | (struct tls12_crypto_info_aes_gcm_256 *)crypto_info; | |
2087 | keysize = TLS_CIPHER_AES_GCM_256_KEY_SIZE; | |
2088 | key = gcm_256_info->key; | |
2089 | salt = gcm_256_info->salt; | |
3c4d7559 DW |
2090 | break; |
2091 | } | |
2092 | default: | |
2093 | rc = -EINVAL; | |
cf6d43ef | 2094 | goto free_priv; |
3c4d7559 DW |
2095 | } |
2096 | ||
b16520f7 | 2097 | /* Sanity-check the IV size for stack allocations. */ |
3463e51d | 2098 | if (iv_size > MAX_IV_SIZE || nonce_size > MAX_IV_SIZE) { |
b16520f7 KC |
2099 | rc = -EINVAL; |
2100 | goto free_priv; | |
2101 | } | |
2102 | ||
a2ef9b6a | 2103 | cctx->aad_size = TLS_AAD_SPACE_SIZE; |
c46234eb DW |
2104 | cctx->prepend_size = TLS_HEADER_SIZE + nonce_size; |
2105 | cctx->tag_size = tag_size; | |
2106 | cctx->overhead_size = cctx->prepend_size + cctx->tag_size; | |
2107 | cctx->iv_size = iv_size; | |
2108 | cctx->iv = kmalloc(iv_size + TLS_CIPHER_AES_GCM_128_SALT_SIZE, | |
2109 | GFP_KERNEL); | |
2110 | if (!cctx->iv) { | |
3c4d7559 | 2111 | rc = -ENOMEM; |
cf6d43ef | 2112 | goto free_priv; |
3c4d7559 | 2113 | } |
fb99bce7 DW |
2114 | /* Note: 128 & 256 bit salt are the same size */ |
2115 | memcpy(cctx->iv, salt, TLS_CIPHER_AES_GCM_128_SALT_SIZE); | |
c46234eb DW |
2116 | memcpy(cctx->iv + TLS_CIPHER_AES_GCM_128_SALT_SIZE, iv, iv_size); |
2117 | cctx->rec_seq_size = rec_seq_size; | |
969d5090 | 2118 | cctx->rec_seq = kmemdup(rec_seq, rec_seq_size, GFP_KERNEL); |
c46234eb | 2119 | if (!cctx->rec_seq) { |
3c4d7559 DW |
2120 | rc = -ENOMEM; |
2121 | goto free_iv; | |
2122 | } | |
c46234eb | 2123 | |
c46234eb DW |
2124 | if (!*aead) { |
2125 | *aead = crypto_alloc_aead("gcm(aes)", 0, 0); | |
2126 | if (IS_ERR(*aead)) { | |
2127 | rc = PTR_ERR(*aead); | |
2128 | *aead = NULL; | |
3c4d7559 DW |
2129 | goto free_rec_seq; |
2130 | } | |
2131 | } | |
2132 | ||
2133 | ctx->push_pending_record = tls_sw_push_pending_record; | |
2134 | ||
fb99bce7 DW |
2135 | rc = crypto_aead_setkey(*aead, key, keysize); |
2136 | ||
3c4d7559 DW |
2137 | if (rc) |
2138 | goto free_aead; | |
2139 | ||
c46234eb DW |
2140 | rc = crypto_aead_setauthsize(*aead, cctx->tag_size); |
2141 | if (rc) | |
2142 | goto free_aead; | |
2143 | ||
f66de3ee | 2144 | if (sw_ctx_rx) { |
692d7b5d VG |
2145 | tfm = crypto_aead_tfm(sw_ctx_rx->aead_recv); |
2146 | sw_ctx_rx->async_capable = | |
2147 | tfm->__crt_alg->cra_flags & CRYPTO_ALG_ASYNC; | |
2148 | ||
c46234eb DW |
2149 | /* Set up strparser */ |
2150 | memset(&cb, 0, sizeof(cb)); | |
2151 | cb.rcv_msg = tls_queue; | |
2152 | cb.parse_msg = tls_read_size; | |
2153 | ||
f66de3ee | 2154 | strp_init(&sw_ctx_rx->strp, sk, &cb); |
c46234eb DW |
2155 | |
2156 | write_lock_bh(&sk->sk_callback_lock); | |
f66de3ee | 2157 | sw_ctx_rx->saved_data_ready = sk->sk_data_ready; |
c46234eb DW |
2158 | sk->sk_data_ready = tls_data_ready; |
2159 | write_unlock_bh(&sk->sk_callback_lock); | |
2160 | ||
f66de3ee | 2161 | strp_check_rcv(&sw_ctx_rx->strp); |
c46234eb DW |
2162 | } |
2163 | ||
2164 | goto out; | |
3c4d7559 DW |
2165 | |
2166 | free_aead: | |
c46234eb DW |
2167 | crypto_free_aead(*aead); |
2168 | *aead = NULL; | |
3c4d7559 | 2169 | free_rec_seq: |
c46234eb DW |
2170 | kfree(cctx->rec_seq); |
2171 | cctx->rec_seq = NULL; | |
3c4d7559 | 2172 | free_iv: |
f66de3ee BP |
2173 | kfree(cctx->iv); |
2174 | cctx->iv = NULL; | |
cf6d43ef | 2175 | free_priv: |
f66de3ee BP |
2176 | if (tx) { |
2177 | kfree(ctx->priv_ctx_tx); | |
2178 | ctx->priv_ctx_tx = NULL; | |
2179 | } else { | |
2180 | kfree(ctx->priv_ctx_rx); | |
2181 | ctx->priv_ctx_rx = NULL; | |
2182 | } | |
3c4d7559 DW |
2183 | out: |
2184 | return rc; | |
2185 | } |