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e8f69799 IL |
1 | /* Copyright (c) 2018, Mellanox Technologies All rights reserved. |
2 | * | |
3 | * This software is available to you under a choice of one of two | |
4 | * licenses. You may choose to be licensed under the terms of the GNU | |
5 | * General Public License (GPL) Version 2, available from the file | |
6 | * COPYING in the main directory of this source tree, or the | |
7 | * OpenIB.org BSD license below: | |
8 | * | |
9 | * Redistribution and use in source and binary forms, with or | |
10 | * without modification, are permitted provided that the following | |
11 | * conditions are met: | |
12 | * | |
13 | * - Redistributions of source code must retain the above | |
14 | * copyright notice, this list of conditions and the following | |
15 | * disclaimer. | |
16 | * | |
17 | * - Redistributions in binary form must reproduce the above | |
18 | * copyright notice, this list of conditions and the following | |
19 | * disclaimer in the documentation and/or other materials | |
20 | * provided with the distribution. | |
21 | * | |
22 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, | |
23 | * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF | |
24 | * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND | |
25 | * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS | |
26 | * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN | |
27 | * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN | |
28 | * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE | |
29 | * SOFTWARE. | |
30 | */ | |
31 | ||
32 | #include <net/tls.h> | |
33 | #include <crypto/aead.h> | |
34 | #include <crypto/scatterwalk.h> | |
35 | #include <net/ip6_checksum.h> | |
f6d827b1 | 36 | #include <linux/skbuff_ref.h> |
e8f69799 | 37 | |
58790314 JK |
38 | #include "tls.h" |
39 | ||
e8f69799 IL |
40 | static void chain_to_walk(struct scatterlist *sg, struct scatter_walk *walk) |
41 | { | |
42 | struct scatterlist *src = walk->sg; | |
43 | int diff = walk->offset - src->offset; | |
44 | ||
45 | sg_set_page(sg, sg_page(src), | |
46 | src->length - diff, walk->offset); | |
47 | ||
8c30fbe6 | 48 | scatterwalk_crypto_chain(sg, sg_next(src), 2); |
e8f69799 IL |
49 | } |
50 | ||
51 | static int tls_enc_record(struct aead_request *aead_req, | |
52 | struct crypto_aead *aead, char *aad, | |
53 | char *iv, __be64 rcd_sn, | |
54 | struct scatter_walk *in, | |
6942a284 VF |
55 | struct scatter_walk *out, int *in_len, |
56 | struct tls_prot_info *prot) | |
e8f69799 | 57 | { |
bee6b7b3 | 58 | unsigned char buf[TLS_HEADER_SIZE + TLS_MAX_IV_SIZE]; |
8db44ab2 | 59 | const struct tls_cipher_desc *cipher_desc; |
e8f69799 IL |
60 | struct scatterlist sg_in[3]; |
61 | struct scatterlist sg_out[3]; | |
ea7a9d88 | 62 | unsigned int buf_size; |
e8f69799 IL |
63 | u16 len; |
64 | int rc; | |
65 | ||
8db44ab2 | 66 | cipher_desc = get_cipher_desc(prot->cipher_type); |
8f1d532b | 67 | DEBUG_NET_WARN_ON_ONCE(!cipher_desc || !cipher_desc->offloadable); |
ea7a9d88 | 68 | |
8db44ab2 | 69 | buf_size = TLS_HEADER_SIZE + cipher_desc->iv; |
ea7a9d88 | 70 | len = min_t(int, *in_len, buf_size); |
e8f69799 IL |
71 | |
72 | scatterwalk_copychunks(buf, in, len, 0); | |
73 | scatterwalk_copychunks(buf, out, len, 1); | |
74 | ||
75 | *in_len -= len; | |
76 | if (!*in_len) | |
77 | return 0; | |
78 | ||
79 | scatterwalk_pagedone(in, 0, 1); | |
80 | scatterwalk_pagedone(out, 1, 1); | |
81 | ||
82 | len = buf[4] | (buf[3] << 8); | |
8db44ab2 | 83 | len -= cipher_desc->iv; |
e8f69799 | 84 | |
8db44ab2 | 85 | tls_make_aad(aad, len - cipher_desc->tag, (char *)&rcd_sn, buf[0], prot); |
e8f69799 | 86 | |
8db44ab2 | 87 | memcpy(iv + cipher_desc->salt, buf + TLS_HEADER_SIZE, cipher_desc->iv); |
e8f69799 IL |
88 | |
89 | sg_init_table(sg_in, ARRAY_SIZE(sg_in)); | |
90 | sg_init_table(sg_out, ARRAY_SIZE(sg_out)); | |
91 | sg_set_buf(sg_in, aad, TLS_AAD_SPACE_SIZE); | |
92 | sg_set_buf(sg_out, aad, TLS_AAD_SPACE_SIZE); | |
93 | chain_to_walk(sg_in + 1, in); | |
94 | chain_to_walk(sg_out + 1, out); | |
95 | ||
96 | *in_len -= len; | |
97 | if (*in_len < 0) { | |
8db44ab2 | 98 | *in_len += cipher_desc->tag; |
e8f69799 IL |
99 | /* the input buffer doesn't contain the entire record. |
100 | * trim len accordingly. The resulting authentication tag | |
101 | * will contain garbage, but we don't care, so we won't | |
102 | * include any of it in the output skb | |
103 | * Note that we assume the output buffer length | |
104 | * is larger then input buffer length + tag size | |
105 | */ | |
106 | if (*in_len < 0) | |
107 | len += *in_len; | |
108 | ||
109 | *in_len = 0; | |
110 | } | |
111 | ||
112 | if (*in_len) { | |
113 | scatterwalk_copychunks(NULL, in, len, 2); | |
114 | scatterwalk_pagedone(in, 0, 1); | |
115 | scatterwalk_copychunks(NULL, out, len, 2); | |
116 | scatterwalk_pagedone(out, 1, 1); | |
117 | } | |
118 | ||
8db44ab2 | 119 | len -= cipher_desc->tag; |
e8f69799 IL |
120 | aead_request_set_crypt(aead_req, sg_in, sg_out, len, iv); |
121 | ||
122 | rc = crypto_aead_encrypt(aead_req); | |
123 | ||
124 | return rc; | |
125 | } | |
126 | ||
127 | static void tls_init_aead_request(struct aead_request *aead_req, | |
128 | struct crypto_aead *aead) | |
129 | { | |
130 | aead_request_set_tfm(aead_req, aead); | |
131 | aead_request_set_ad(aead_req, TLS_AAD_SPACE_SIZE); | |
132 | } | |
133 | ||
134 | static struct aead_request *tls_alloc_aead_request(struct crypto_aead *aead, | |
135 | gfp_t flags) | |
136 | { | |
137 | unsigned int req_size = sizeof(struct aead_request) + | |
138 | crypto_aead_reqsize(aead); | |
139 | struct aead_request *aead_req; | |
140 | ||
141 | aead_req = kzalloc(req_size, flags); | |
142 | if (aead_req) | |
143 | tls_init_aead_request(aead_req, aead); | |
144 | return aead_req; | |
145 | } | |
146 | ||
147 | static int tls_enc_records(struct aead_request *aead_req, | |
148 | struct crypto_aead *aead, struct scatterlist *sg_in, | |
149 | struct scatterlist *sg_out, char *aad, char *iv, | |
6942a284 | 150 | u64 rcd_sn, int len, struct tls_prot_info *prot) |
e8f69799 IL |
151 | { |
152 | struct scatter_walk out, in; | |
153 | int rc; | |
154 | ||
155 | scatterwalk_start(&in, sg_in); | |
156 | scatterwalk_start(&out, sg_out); | |
157 | ||
158 | do { | |
159 | rc = tls_enc_record(aead_req, aead, aad, iv, | |
6942a284 | 160 | cpu_to_be64(rcd_sn), &in, &out, &len, prot); |
e8f69799 IL |
161 | rcd_sn++; |
162 | ||
163 | } while (rc == 0 && len); | |
164 | ||
165 | scatterwalk_done(&in, 0, 0); | |
166 | scatterwalk_done(&out, 1, 0); | |
167 | ||
168 | return rc; | |
169 | } | |
170 | ||
171 | /* Can't use icsk->icsk_af_ops->send_check here because the ip addresses | |
172 | * might have been changed by NAT. | |
173 | */ | |
174 | static void update_chksum(struct sk_buff *skb, int headln) | |
175 | { | |
176 | struct tcphdr *th = tcp_hdr(skb); | |
177 | int datalen = skb->len - headln; | |
178 | const struct ipv6hdr *ipv6h; | |
179 | const struct iphdr *iph; | |
180 | ||
181 | /* We only changed the payload so if we are using partial we don't | |
182 | * need to update anything. | |
183 | */ | |
184 | if (likely(skb->ip_summed == CHECKSUM_PARTIAL)) | |
185 | return; | |
186 | ||
187 | skb->ip_summed = CHECKSUM_PARTIAL; | |
188 | skb->csum_start = skb_transport_header(skb) - skb->head; | |
189 | skb->csum_offset = offsetof(struct tcphdr, check); | |
190 | ||
191 | if (skb->sk->sk_family == AF_INET6) { | |
192 | ipv6h = ipv6_hdr(skb); | |
193 | th->check = ~csum_ipv6_magic(&ipv6h->saddr, &ipv6h->daddr, | |
194 | datalen, IPPROTO_TCP, 0); | |
195 | } else { | |
196 | iph = ip_hdr(skb); | |
197 | th->check = ~csum_tcpudp_magic(iph->saddr, iph->daddr, datalen, | |
198 | IPPROTO_TCP, 0); | |
199 | } | |
200 | } | |
201 | ||
202 | static void complete_skb(struct sk_buff *nskb, struct sk_buff *skb, int headln) | |
203 | { | |
9188d5ca JK |
204 | struct sock *sk = skb->sk; |
205 | int delta; | |
206 | ||
e8f69799 IL |
207 | skb_copy_header(nskb, skb); |
208 | ||
209 | skb_put(nskb, skb->len); | |
210 | memcpy(nskb->data, skb->data, headln); | |
e8f69799 IL |
211 | |
212 | nskb->destructor = skb->destructor; | |
9188d5ca | 213 | nskb->sk = sk; |
e8f69799 IL |
214 | skb->destructor = NULL; |
215 | skb->sk = NULL; | |
9188d5ca | 216 | |
2dcb0033 JK |
217 | update_chksum(nskb, headln); |
218 | ||
5c4b4608 JK |
219 | /* sock_efree means skb must gone through skb_orphan_partial() */ |
220 | if (nskb->destructor == sock_efree) | |
221 | return; | |
222 | ||
9188d5ca JK |
223 | delta = nskb->truesize - skb->truesize; |
224 | if (likely(delta < 0)) | |
225 | WARN_ON_ONCE(refcount_sub_and_test(-delta, &sk->sk_wmem_alloc)); | |
226 | else if (delta) | |
227 | refcount_add(delta, &sk->sk_wmem_alloc); | |
e8f69799 IL |
228 | } |
229 | ||
230 | /* This function may be called after the user socket is already | |
231 | * closed so make sure we don't use anything freed during | |
232 | * tls_sk_proto_close here | |
233 | */ | |
234 | ||
235 | static int fill_sg_in(struct scatterlist *sg_in, | |
236 | struct sk_buff *skb, | |
d80a1b9d | 237 | struct tls_offload_context_tx *ctx, |
e8f69799 IL |
238 | u64 *rcd_sn, |
239 | s32 *sync_size, | |
240 | int *resync_sgs) | |
241 | { | |
504148fe | 242 | int tcp_payload_offset = skb_tcp_all_headers(skb); |
e8f69799 IL |
243 | int payload_len = skb->len - tcp_payload_offset; |
244 | u32 tcp_seq = ntohl(tcp_hdr(skb)->seq); | |
245 | struct tls_record_info *record; | |
246 | unsigned long flags; | |
247 | int remaining; | |
248 | int i; | |
249 | ||
250 | spin_lock_irqsave(&ctx->lock, flags); | |
251 | record = tls_get_record(ctx, tcp_seq, rcd_sn); | |
252 | if (!record) { | |
253 | spin_unlock_irqrestore(&ctx->lock, flags); | |
e8f69799 IL |
254 | return -EINVAL; |
255 | } | |
256 | ||
257 | *sync_size = tcp_seq - tls_record_start_seq(record); | |
258 | if (*sync_size < 0) { | |
259 | int is_start_marker = tls_record_is_start_marker(record); | |
260 | ||
261 | spin_unlock_irqrestore(&ctx->lock, flags); | |
262 | /* This should only occur if the relevant record was | |
263 | * already acked. In that case it should be ok | |
264 | * to drop the packet and avoid retransmission. | |
265 | * | |
266 | * There is a corner case where the packet contains | |
267 | * both an acked and a non-acked record. | |
268 | * We currently don't handle that case and rely | |
a0e128ef | 269 | * on TCP to retransmit a packet that doesn't contain |
e8f69799 IL |
270 | * already acked payload. |
271 | */ | |
272 | if (!is_start_marker) | |
273 | *sync_size = 0; | |
274 | return -EINVAL; | |
275 | } | |
276 | ||
277 | remaining = *sync_size; | |
278 | for (i = 0; remaining > 0; i++) { | |
279 | skb_frag_t *frag = &record->frags[i]; | |
280 | ||
173e7622 | 281 | __skb_frag_ref(frag); |
e8f69799 | 282 | sg_set_page(sg_in + i, skb_frag_page(frag), |
b54c9d5b | 283 | skb_frag_size(frag), skb_frag_off(frag)); |
e8f69799 IL |
284 | |
285 | remaining -= skb_frag_size(frag); | |
286 | ||
287 | if (remaining < 0) | |
288 | sg_in[i].length += remaining; | |
289 | } | |
290 | *resync_sgs = i; | |
291 | ||
292 | spin_unlock_irqrestore(&ctx->lock, flags); | |
293 | if (skb_to_sgvec(skb, &sg_in[i], tcp_payload_offset, payload_len) < 0) | |
294 | return -EINVAL; | |
295 | ||
296 | return 0; | |
297 | } | |
298 | ||
299 | static void fill_sg_out(struct scatterlist sg_out[3], void *buf, | |
300 | struct tls_context *tls_ctx, | |
301 | struct sk_buff *nskb, | |
302 | int tcp_payload_offset, | |
303 | int payload_len, | |
304 | int sync_size, | |
305 | void *dummy_buf) | |
306 | { | |
8db44ab2 SD |
307 | const struct tls_cipher_desc *cipher_desc = |
308 | get_cipher_desc(tls_ctx->crypto_send.info.cipher_type); | |
ea7a9d88 | 309 | |
e8f69799 IL |
310 | sg_set_buf(&sg_out[0], dummy_buf, sync_size); |
311 | sg_set_buf(&sg_out[1], nskb->data + tcp_payload_offset, payload_len); | |
312 | /* Add room for authentication tag produced by crypto */ | |
313 | dummy_buf += sync_size; | |
8db44ab2 | 314 | sg_set_buf(&sg_out[2], dummy_buf, cipher_desc->tag); |
e8f69799 IL |
315 | } |
316 | ||
317 | static struct sk_buff *tls_enc_skb(struct tls_context *tls_ctx, | |
318 | struct scatterlist sg_out[3], | |
319 | struct scatterlist *sg_in, | |
320 | struct sk_buff *skb, | |
321 | s32 sync_size, u64 rcd_sn) | |
322 | { | |
d80a1b9d | 323 | struct tls_offload_context_tx *ctx = tls_offload_ctx_tx(tls_ctx); |
504148fe | 324 | int tcp_payload_offset = skb_tcp_all_headers(skb); |
e8f69799 | 325 | int payload_len = skb->len - tcp_payload_offset; |
8db44ab2 | 326 | const struct tls_cipher_desc *cipher_desc; |
ea7a9d88 | 327 | void *buf, *iv, *aad, *dummy_buf, *salt; |
e8f69799 IL |
328 | struct aead_request *aead_req; |
329 | struct sk_buff *nskb = NULL; | |
330 | int buf_len; | |
331 | ||
332 | aead_req = tls_alloc_aead_request(ctx->aead_send, GFP_ATOMIC); | |
333 | if (!aead_req) | |
334 | return NULL; | |
335 | ||
8db44ab2 | 336 | cipher_desc = get_cipher_desc(tls_ctx->crypto_send.info.cipher_type); |
8f1d532b SD |
337 | DEBUG_NET_WARN_ON_ONCE(!cipher_desc || !cipher_desc->offloadable); |
338 | ||
8db44ab2 SD |
339 | buf_len = cipher_desc->salt + cipher_desc->iv + TLS_AAD_SPACE_SIZE + |
340 | sync_size + cipher_desc->tag; | |
e8f69799 IL |
341 | buf = kmalloc(buf_len, GFP_ATOMIC); |
342 | if (!buf) | |
343 | goto free_req; | |
344 | ||
345 | iv = buf; | |
3bab3ee0 | 346 | salt = crypto_info_salt(&tls_ctx->crypto_send.info, cipher_desc); |
8db44ab2 SD |
347 | memcpy(iv, salt, cipher_desc->salt); |
348 | aad = buf + cipher_desc->salt + cipher_desc->iv; | |
e8f69799 IL |
349 | dummy_buf = aad + TLS_AAD_SPACE_SIZE; |
350 | ||
351 | nskb = alloc_skb(skb_headroom(skb) + skb->len, GFP_ATOMIC); | |
352 | if (!nskb) | |
353 | goto free_buf; | |
354 | ||
355 | skb_reserve(nskb, skb_headroom(skb)); | |
356 | ||
357 | fill_sg_out(sg_out, buf, tls_ctx, nskb, tcp_payload_offset, | |
358 | payload_len, sync_size, dummy_buf); | |
359 | ||
360 | if (tls_enc_records(aead_req, ctx->aead_send, sg_in, sg_out, aad, iv, | |
6942a284 VF |
361 | rcd_sn, sync_size + payload_len, |
362 | &tls_ctx->prot_info) < 0) | |
e8f69799 IL |
363 | goto free_nskb; |
364 | ||
365 | complete_skb(nskb, skb, tcp_payload_offset); | |
366 | ||
367 | /* validate_xmit_skb_list assumes that if the skb wasn't segmented | |
368 | * nskb->prev will point to the skb itself | |
369 | */ | |
370 | nskb->prev = nskb; | |
371 | ||
372 | free_buf: | |
373 | kfree(buf); | |
374 | free_req: | |
375 | kfree(aead_req); | |
376 | return nskb; | |
377 | free_nskb: | |
378 | kfree_skb(nskb); | |
379 | nskb = NULL; | |
380 | goto free_buf; | |
381 | } | |
382 | ||
383 | static struct sk_buff *tls_sw_fallback(struct sock *sk, struct sk_buff *skb) | |
384 | { | |
504148fe | 385 | int tcp_payload_offset = skb_tcp_all_headers(skb); |
e8f69799 | 386 | struct tls_context *tls_ctx = tls_get_ctx(sk); |
d80a1b9d | 387 | struct tls_offload_context_tx *ctx = tls_offload_ctx_tx(tls_ctx); |
e8f69799 IL |
388 | int payload_len = skb->len - tcp_payload_offset; |
389 | struct scatterlist *sg_in, sg_out[3]; | |
390 | struct sk_buff *nskb = NULL; | |
391 | int sg_in_max_elements; | |
392 | int resync_sgs = 0; | |
393 | s32 sync_size = 0; | |
394 | u64 rcd_sn; | |
395 | ||
396 | /* worst case is: | |
397 | * MAX_SKB_FRAGS in tls_record_info | |
398 | * MAX_SKB_FRAGS + 1 in SKB head and frags. | |
399 | */ | |
400 | sg_in_max_elements = 2 * MAX_SKB_FRAGS + 1; | |
401 | ||
402 | if (!payload_len) | |
403 | return skb; | |
404 | ||
405 | sg_in = kmalloc_array(sg_in_max_elements, sizeof(*sg_in), GFP_ATOMIC); | |
406 | if (!sg_in) | |
407 | goto free_orig; | |
408 | ||
409 | sg_init_table(sg_in, sg_in_max_elements); | |
410 | sg_init_table(sg_out, ARRAY_SIZE(sg_out)); | |
411 | ||
412 | if (fill_sg_in(sg_in, skb, ctx, &rcd_sn, &sync_size, &resync_sgs)) { | |
413 | /* bypass packets before kernel TLS socket option was set */ | |
414 | if (sync_size < 0 && payload_len <= -sync_size) | |
415 | nskb = skb_get(skb); | |
416 | goto put_sg; | |
417 | } | |
418 | ||
419 | nskb = tls_enc_skb(tls_ctx, sg_out, sg_in, skb, sync_size, rcd_sn); | |
420 | ||
421 | put_sg: | |
422 | while (resync_sgs) | |
423 | put_page(sg_page(&sg_in[--resync_sgs])); | |
424 | kfree(sg_in); | |
425 | free_orig: | |
87b11e06 JK |
426 | if (nskb) |
427 | consume_skb(skb); | |
428 | else | |
429 | kfree_skb(skb); | |
e8f69799 IL |
430 | return nskb; |
431 | } | |
432 | ||
433 | struct sk_buff *tls_validate_xmit_skb(struct sock *sk, | |
434 | struct net_device *dev, | |
435 | struct sk_buff *skb) | |
436 | { | |
94ce3b64 MM |
437 | if (dev == rcu_dereference_bh(tls_get_ctx(sk)->netdev) || |
438 | netif_is_bond_master(dev)) | |
e8f69799 IL |
439 | return skb; |
440 | ||
441 | return tls_sw_fallback(sk, skb); | |
442 | } | |
4799ac81 | 443 | EXPORT_SYMBOL_GPL(tls_validate_xmit_skb); |
e8f69799 | 444 | |
c55dcdd4 MM |
445 | struct sk_buff *tls_validate_xmit_skb_sw(struct sock *sk, |
446 | struct net_device *dev, | |
447 | struct sk_buff *skb) | |
448 | { | |
449 | return tls_sw_fallback(sk, skb); | |
450 | } | |
451 | ||
b9727d7f DM |
452 | struct sk_buff *tls_encrypt_skb(struct sk_buff *skb) |
453 | { | |
454 | return tls_sw_fallback(skb->sk, skb); | |
455 | } | |
456 | EXPORT_SYMBOL_GPL(tls_encrypt_skb); | |
457 | ||
e8f69799 | 458 | int tls_sw_fallback_init(struct sock *sk, |
d80a1b9d | 459 | struct tls_offload_context_tx *offload_ctx, |
e8f69799 IL |
460 | struct tls_crypto_info *crypto_info) |
461 | { | |
8db44ab2 | 462 | const struct tls_cipher_desc *cipher_desc; |
e8f69799 IL |
463 | int rc; |
464 | ||
8db44ab2 | 465 | cipher_desc = get_cipher_desc(crypto_info->cipher_type); |
e907277a SD |
466 | if (!cipher_desc || !cipher_desc->offloadable) |
467 | return -EINVAL; | |
e8f69799 | 468 | |
d2322cf5 | 469 | offload_ctx->aead_send = |
e907277a | 470 | crypto_alloc_aead(cipher_desc->cipher_name, 0, CRYPTO_ALG_ASYNC); |
d2322cf5 SD |
471 | if (IS_ERR(offload_ctx->aead_send)) { |
472 | rc = PTR_ERR(offload_ctx->aead_send); | |
473 | pr_err_ratelimited("crypto_alloc_aead failed rc=%d\n", rc); | |
474 | offload_ctx->aead_send = NULL; | |
475 | goto err_out; | |
476 | } | |
477 | ||
e907277a SD |
478 | rc = crypto_aead_setkey(offload_ctx->aead_send, |
479 | crypto_info_key(crypto_info, cipher_desc), | |
480 | cipher_desc->key); | |
e8f69799 IL |
481 | if (rc) |
482 | goto free_aead; | |
483 | ||
8db44ab2 | 484 | rc = crypto_aead_setauthsize(offload_ctx->aead_send, cipher_desc->tag); |
e8f69799 IL |
485 | if (rc) |
486 | goto free_aead; | |
487 | ||
488 | return 0; | |
489 | free_aead: | |
490 | crypto_free_aead(offload_ctx->aead_send); | |
491 | err_out: | |
492 | return rc; | |
493 | } |