Version:  2.0.40 2.2.26 2.4.37 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8 4.9 4.10

Linux/crypto/algif_aead.c

  1 /*
  2  * algif_aead: User-space interface for AEAD algorithms
  3  *
  4  * Copyright (C) 2014, Stephan Mueller <smueller@chronox.de>
  5  *
  6  * This file provides the user-space API for AEAD ciphers.
  7  *
  8  * This file is derived from algif_skcipher.c.
  9  *
 10  * This program is free software; you can redistribute it and/or modify it
 11  * under the terms of the GNU General Public License as published by the Free
 12  * Software Foundation; either version 2 of the License, or (at your option)
 13  * any later version.
 14  */
 15 
 16 #include <crypto/internal/aead.h>
 17 #include <crypto/scatterwalk.h>
 18 #include <crypto/if_alg.h>
 19 #include <linux/init.h>
 20 #include <linux/list.h>
 21 #include <linux/kernel.h>
 22 #include <linux/mm.h>
 23 #include <linux/module.h>
 24 #include <linux/net.h>
 25 #include <net/sock.h>
 26 
 27 struct aead_sg_list {
 28         unsigned int cur;
 29         struct scatterlist sg[ALG_MAX_PAGES];
 30 };
 31 
 32 struct aead_async_rsgl {
 33         struct af_alg_sgl sgl;
 34         struct list_head list;
 35 };
 36 
 37 struct aead_async_req {
 38         struct scatterlist *tsgl;
 39         struct aead_async_rsgl first_rsgl;
 40         struct list_head list;
 41         struct kiocb *iocb;
 42         unsigned int tsgls;
 43         char iv[];
 44 };
 45 
 46 struct aead_ctx {
 47         struct aead_sg_list tsgl;
 48         struct aead_async_rsgl first_rsgl;
 49         struct list_head list;
 50 
 51         void *iv;
 52 
 53         struct af_alg_completion completion;
 54 
 55         unsigned long used;
 56 
 57         unsigned int len;
 58         bool more;
 59         bool merge;
 60         bool enc;
 61 
 62         size_t aead_assoclen;
 63         struct aead_request aead_req;
 64 };
 65 
 66 static inline int aead_sndbuf(struct sock *sk)
 67 {
 68         struct alg_sock *ask = alg_sk(sk);
 69         struct aead_ctx *ctx = ask->private;
 70 
 71         return max_t(int, max_t(int, sk->sk_sndbuf & PAGE_MASK, PAGE_SIZE) -
 72                           ctx->used, 0);
 73 }
 74 
 75 static inline bool aead_writable(struct sock *sk)
 76 {
 77         return PAGE_SIZE <= aead_sndbuf(sk);
 78 }
 79 
 80 static inline bool aead_sufficient_data(struct aead_ctx *ctx)
 81 {
 82         unsigned as = crypto_aead_authsize(crypto_aead_reqtfm(&ctx->aead_req));
 83 
 84         /*
 85          * The minimum amount of memory needed for an AEAD cipher is
 86          * the AAD and in case of decryption the tag.
 87          */
 88         return ctx->used >= ctx->aead_assoclen + (ctx->enc ? 0 : as);
 89 }
 90 
 91 static void aead_reset_ctx(struct aead_ctx *ctx)
 92 {
 93         struct aead_sg_list *sgl = &ctx->tsgl;
 94 
 95         sg_init_table(sgl->sg, ALG_MAX_PAGES);
 96         sgl->cur = 0;
 97         ctx->used = 0;
 98         ctx->more = 0;
 99         ctx->merge = 0;
100 }
101 
102 static void aead_put_sgl(struct sock *sk)
103 {
104         struct alg_sock *ask = alg_sk(sk);
105         struct aead_ctx *ctx = ask->private;
106         struct aead_sg_list *sgl = &ctx->tsgl;
107         struct scatterlist *sg = sgl->sg;
108         unsigned int i;
109 
110         for (i = 0; i < sgl->cur; i++) {
111                 if (!sg_page(sg + i))
112                         continue;
113 
114                 put_page(sg_page(sg + i));
115                 sg_assign_page(sg + i, NULL);
116         }
117         aead_reset_ctx(ctx);
118 }
119 
120 static void aead_wmem_wakeup(struct sock *sk)
121 {
122         struct socket_wq *wq;
123 
124         if (!aead_writable(sk))
125                 return;
126 
127         rcu_read_lock();
128         wq = rcu_dereference(sk->sk_wq);
129         if (skwq_has_sleeper(wq))
130                 wake_up_interruptible_sync_poll(&wq->wait, POLLIN |
131                                                            POLLRDNORM |
132                                                            POLLRDBAND);
133         sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN);
134         rcu_read_unlock();
135 }
136 
137 static int aead_wait_for_data(struct sock *sk, unsigned flags)
138 {
139         DEFINE_WAIT_FUNC(wait, woken_wake_function);
140         struct alg_sock *ask = alg_sk(sk);
141         struct aead_ctx *ctx = ask->private;
142         long timeout;
143         int err = -ERESTARTSYS;
144 
145         if (flags & MSG_DONTWAIT)
146                 return -EAGAIN;
147 
148         sk_set_bit(SOCKWQ_ASYNC_WAITDATA, sk);
149         add_wait_queue(sk_sleep(sk), &wait);
150         for (;;) {
151                 if (signal_pending(current))
152                         break;
153                 timeout = MAX_SCHEDULE_TIMEOUT;
154                 if (sk_wait_event(sk, &timeout, !ctx->more, &wait)) {
155                         err = 0;
156                         break;
157                 }
158         }
159         remove_wait_queue(sk_sleep(sk), &wait);
160 
161         sk_clear_bit(SOCKWQ_ASYNC_WAITDATA, sk);
162 
163         return err;
164 }
165 
166 static void aead_data_wakeup(struct sock *sk)
167 {
168         struct alg_sock *ask = alg_sk(sk);
169         struct aead_ctx *ctx = ask->private;
170         struct socket_wq *wq;
171 
172         if (ctx->more)
173                 return;
174         if (!ctx->used)
175                 return;
176 
177         rcu_read_lock();
178         wq = rcu_dereference(sk->sk_wq);
179         if (skwq_has_sleeper(wq))
180                 wake_up_interruptible_sync_poll(&wq->wait, POLLOUT |
181                                                            POLLRDNORM |
182                                                            POLLRDBAND);
183         sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
184         rcu_read_unlock();
185 }
186 
187 static int aead_sendmsg(struct socket *sock, struct msghdr *msg, size_t size)
188 {
189         struct sock *sk = sock->sk;
190         struct alg_sock *ask = alg_sk(sk);
191         struct aead_ctx *ctx = ask->private;
192         unsigned ivsize =
193                 crypto_aead_ivsize(crypto_aead_reqtfm(&ctx->aead_req));
194         struct aead_sg_list *sgl = &ctx->tsgl;
195         struct af_alg_control con = {};
196         long copied = 0;
197         bool enc = 0;
198         bool init = 0;
199         int err = -EINVAL;
200 
201         if (msg->msg_controllen) {
202                 err = af_alg_cmsg_send(msg, &con);
203                 if (err)
204                         return err;
205 
206                 init = 1;
207                 switch (con.op) {
208                 case ALG_OP_ENCRYPT:
209                         enc = 1;
210                         break;
211                 case ALG_OP_DECRYPT:
212                         enc = 0;
213                         break;
214                 default:
215                         return -EINVAL;
216                 }
217 
218                 if (con.iv && con.iv->ivlen != ivsize)
219                         return -EINVAL;
220         }
221 
222         lock_sock(sk);
223         if (!ctx->more && ctx->used)
224                 goto unlock;
225 
226         if (init) {
227                 ctx->enc = enc;
228                 if (con.iv)
229                         memcpy(ctx->iv, con.iv->iv, ivsize);
230 
231                 ctx->aead_assoclen = con.aead_assoclen;
232         }
233 
234         while (size) {
235                 size_t len = size;
236                 struct scatterlist *sg = NULL;
237 
238                 /* use the existing memory in an allocated page */
239                 if (ctx->merge) {
240                         sg = sgl->sg + sgl->cur - 1;
241                         len = min_t(unsigned long, len,
242                                     PAGE_SIZE - sg->offset - sg->length);
243                         err = memcpy_from_msg(page_address(sg_page(sg)) +
244                                               sg->offset + sg->length,
245                                               msg, len);
246                         if (err)
247                                 goto unlock;
248 
249                         sg->length += len;
250                         ctx->merge = (sg->offset + sg->length) &
251                                      (PAGE_SIZE - 1);
252 
253                         ctx->used += len;
254                         copied += len;
255                         size -= len;
256                         continue;
257                 }
258 
259                 if (!aead_writable(sk)) {
260                         /* user space sent too much data */
261                         aead_put_sgl(sk);
262                         err = -EMSGSIZE;
263                         goto unlock;
264                 }
265 
266                 /* allocate a new page */
267                 len = min_t(unsigned long, size, aead_sndbuf(sk));
268                 while (len) {
269                         size_t plen = 0;
270 
271                         if (sgl->cur >= ALG_MAX_PAGES) {
272                                 aead_put_sgl(sk);
273                                 err = -E2BIG;
274                                 goto unlock;
275                         }
276 
277                         sg = sgl->sg + sgl->cur;
278                         plen = min_t(size_t, len, PAGE_SIZE);
279 
280                         sg_assign_page(sg, alloc_page(GFP_KERNEL));
281                         err = -ENOMEM;
282                         if (!sg_page(sg))
283                                 goto unlock;
284 
285                         err = memcpy_from_msg(page_address(sg_page(sg)),
286                                               msg, plen);
287                         if (err) {
288                                 __free_page(sg_page(sg));
289                                 sg_assign_page(sg, NULL);
290                                 goto unlock;
291                         }
292 
293                         sg->offset = 0;
294                         sg->length = plen;
295                         len -= plen;
296                         ctx->used += plen;
297                         copied += plen;
298                         sgl->cur++;
299                         size -= plen;
300                         ctx->merge = plen & (PAGE_SIZE - 1);
301                 }
302         }
303 
304         err = 0;
305 
306         ctx->more = msg->msg_flags & MSG_MORE;
307         if (!ctx->more && !aead_sufficient_data(ctx)) {
308                 aead_put_sgl(sk);
309                 err = -EMSGSIZE;
310         }
311 
312 unlock:
313         aead_data_wakeup(sk);
314         release_sock(sk);
315 
316         return err ?: copied;
317 }
318 
319 static ssize_t aead_sendpage(struct socket *sock, struct page *page,
320                              int offset, size_t size, int flags)
321 {
322         struct sock *sk = sock->sk;
323         struct alg_sock *ask = alg_sk(sk);
324         struct aead_ctx *ctx = ask->private;
325         struct aead_sg_list *sgl = &ctx->tsgl;
326         int err = -EINVAL;
327 
328         if (flags & MSG_SENDPAGE_NOTLAST)
329                 flags |= MSG_MORE;
330 
331         if (sgl->cur >= ALG_MAX_PAGES)
332                 return -E2BIG;
333 
334         lock_sock(sk);
335         if (!ctx->more && ctx->used)
336                 goto unlock;
337 
338         if (!size)
339                 goto done;
340 
341         if (!aead_writable(sk)) {
342                 /* user space sent too much data */
343                 aead_put_sgl(sk);
344                 err = -EMSGSIZE;
345                 goto unlock;
346         }
347 
348         ctx->merge = 0;
349 
350         get_page(page);
351         sg_set_page(sgl->sg + sgl->cur, page, size, offset);
352         sgl->cur++;
353         ctx->used += size;
354 
355         err = 0;
356 
357 done:
358         ctx->more = flags & MSG_MORE;
359         if (!ctx->more && !aead_sufficient_data(ctx)) {
360                 aead_put_sgl(sk);
361                 err = -EMSGSIZE;
362         }
363 
364 unlock:
365         aead_data_wakeup(sk);
366         release_sock(sk);
367 
368         return err ?: size;
369 }
370 
371 #define GET_ASYM_REQ(req, tfm) (struct aead_async_req *) \
372                 ((char *)req + sizeof(struct aead_request) + \
373                  crypto_aead_reqsize(tfm))
374 
375  #define GET_REQ_SIZE(tfm) sizeof(struct aead_async_req) + \
376         crypto_aead_reqsize(tfm) + crypto_aead_ivsize(tfm) + \
377         sizeof(struct aead_request)
378 
379 static void aead_async_cb(struct crypto_async_request *_req, int err)
380 {
381         struct sock *sk = _req->data;
382         struct alg_sock *ask = alg_sk(sk);
383         struct aead_ctx *ctx = ask->private;
384         struct crypto_aead *tfm = crypto_aead_reqtfm(&ctx->aead_req);
385         struct aead_request *req = aead_request_cast(_req);
386         struct aead_async_req *areq = GET_ASYM_REQ(req, tfm);
387         struct scatterlist *sg = areq->tsgl;
388         struct aead_async_rsgl *rsgl;
389         struct kiocb *iocb = areq->iocb;
390         unsigned int i, reqlen = GET_REQ_SIZE(tfm);
391 
392         list_for_each_entry(rsgl, &areq->list, list) {
393                 af_alg_free_sg(&rsgl->sgl);
394                 if (rsgl != &areq->first_rsgl)
395                         sock_kfree_s(sk, rsgl, sizeof(*rsgl));
396         }
397 
398         for (i = 0; i < areq->tsgls; i++)
399                 put_page(sg_page(sg + i));
400 
401         sock_kfree_s(sk, areq->tsgl, sizeof(*areq->tsgl) * areq->tsgls);
402         sock_kfree_s(sk, req, reqlen);
403         __sock_put(sk);
404         iocb->ki_complete(iocb, err, err);
405 }
406 
407 static int aead_recvmsg_async(struct socket *sock, struct msghdr *msg,
408                               int flags)
409 {
410         struct sock *sk = sock->sk;
411         struct alg_sock *ask = alg_sk(sk);
412         struct aead_ctx *ctx = ask->private;
413         struct crypto_aead *tfm = crypto_aead_reqtfm(&ctx->aead_req);
414         struct aead_async_req *areq;
415         struct aead_request *req = NULL;
416         struct aead_sg_list *sgl = &ctx->tsgl;
417         struct aead_async_rsgl *last_rsgl = NULL, *rsgl;
418         unsigned int as = crypto_aead_authsize(tfm);
419         unsigned int i, reqlen = GET_REQ_SIZE(tfm);
420         int err = -ENOMEM;
421         unsigned long used;
422         size_t outlen = 0;
423         size_t usedpages = 0;
424 
425         lock_sock(sk);
426         if (ctx->more) {
427                 err = aead_wait_for_data(sk, flags);
428                 if (err)
429                         goto unlock;
430         }
431 
432         if (!aead_sufficient_data(ctx))
433                 goto unlock;
434 
435         used = ctx->used;
436         if (ctx->enc)
437                 outlen = used + as;
438         else
439                 outlen = used - as;
440 
441         req = sock_kmalloc(sk, reqlen, GFP_KERNEL);
442         if (unlikely(!req))
443                 goto unlock;
444 
445         areq = GET_ASYM_REQ(req, tfm);
446         memset(&areq->first_rsgl, '\0', sizeof(areq->first_rsgl));
447         INIT_LIST_HEAD(&areq->list);
448         areq->iocb = msg->msg_iocb;
449         memcpy(areq->iv, ctx->iv, crypto_aead_ivsize(tfm));
450         aead_request_set_tfm(req, tfm);
451         aead_request_set_ad(req, ctx->aead_assoclen);
452         aead_request_set_callback(req, CRYPTO_TFM_REQ_MAY_BACKLOG,
453                                   aead_async_cb, sk);
454         used -= ctx->aead_assoclen;
455 
456         /* take over all tx sgls from ctx */
457         areq->tsgl = sock_kmalloc(sk,
458                                   sizeof(*areq->tsgl) * max_t(u32, sgl->cur, 1),
459                                   GFP_KERNEL);
460         if (unlikely(!areq->tsgl))
461                 goto free;
462 
463         sg_init_table(areq->tsgl, max_t(u32, sgl->cur, 1));
464         for (i = 0; i < sgl->cur; i++)
465                 sg_set_page(&areq->tsgl[i], sg_page(&sgl->sg[i]),
466                             sgl->sg[i].length, sgl->sg[i].offset);
467 
468         areq->tsgls = sgl->cur;
469 
470         /* create rx sgls */
471         while (outlen > usedpages && iov_iter_count(&msg->msg_iter)) {
472                 size_t seglen = min_t(size_t, iov_iter_count(&msg->msg_iter),
473                                       (outlen - usedpages));
474 
475                 if (list_empty(&areq->list)) {
476                         rsgl = &areq->first_rsgl;
477 
478                 } else {
479                         rsgl = sock_kmalloc(sk, sizeof(*rsgl), GFP_KERNEL);
480                         if (unlikely(!rsgl)) {
481                                 err = -ENOMEM;
482                                 goto free;
483                         }
484                 }
485                 rsgl->sgl.npages = 0;
486                 list_add_tail(&rsgl->list, &areq->list);
487 
488                 /* make one iovec available as scatterlist */
489                 err = af_alg_make_sg(&rsgl->sgl, &msg->msg_iter, seglen);
490                 if (err < 0)
491                         goto free;
492 
493                 usedpages += err;
494 
495                 /* chain the new scatterlist with previous one */
496                 if (last_rsgl)
497                         af_alg_link_sg(&last_rsgl->sgl, &rsgl->sgl);
498 
499                 last_rsgl = rsgl;
500 
501                 iov_iter_advance(&msg->msg_iter, err);
502         }
503 
504         /* ensure output buffer is sufficiently large */
505         if (usedpages < outlen) {
506                 err = -EINVAL;
507                 goto unlock;
508         }
509 
510         aead_request_set_crypt(req, areq->tsgl, areq->first_rsgl.sgl.sg, used,
511                                areq->iv);
512         err = ctx->enc ? crypto_aead_encrypt(req) : crypto_aead_decrypt(req);
513         if (err) {
514                 if (err == -EINPROGRESS) {
515                         sock_hold(sk);
516                         err = -EIOCBQUEUED;
517                         aead_reset_ctx(ctx);
518                         goto unlock;
519                 } else if (err == -EBADMSG) {
520                         aead_put_sgl(sk);
521                 }
522                 goto free;
523         }
524         aead_put_sgl(sk);
525 
526 free:
527         list_for_each_entry(rsgl, &areq->list, list) {
528                 af_alg_free_sg(&rsgl->sgl);
529                 if (rsgl != &areq->first_rsgl)
530                         sock_kfree_s(sk, rsgl, sizeof(*rsgl));
531         }
532         if (areq->tsgl)
533                 sock_kfree_s(sk, areq->tsgl, sizeof(*areq->tsgl) * areq->tsgls);
534         if (req)
535                 sock_kfree_s(sk, req, reqlen);
536 unlock:
537         aead_wmem_wakeup(sk);
538         release_sock(sk);
539         return err ? err : outlen;
540 }
541 
542 static int aead_recvmsg_sync(struct socket *sock, struct msghdr *msg, int flags)
543 {
544         struct sock *sk = sock->sk;
545         struct alg_sock *ask = alg_sk(sk);
546         struct aead_ctx *ctx = ask->private;
547         unsigned as = crypto_aead_authsize(crypto_aead_reqtfm(&ctx->aead_req));
548         struct aead_sg_list *sgl = &ctx->tsgl;
549         struct aead_async_rsgl *last_rsgl = NULL;
550         struct aead_async_rsgl *rsgl, *tmp;
551         int err = -EINVAL;
552         unsigned long used = 0;
553         size_t outlen = 0;
554         size_t usedpages = 0;
555 
556         lock_sock(sk);
557 
558         /*
559          * Please see documentation of aead_request_set_crypt for the
560          * description of the AEAD memory structure expected from the caller.
561          */
562 
563         if (ctx->more) {
564                 err = aead_wait_for_data(sk, flags);
565                 if (err)
566                         goto unlock;
567         }
568 
569         /* data length provided by caller via sendmsg/sendpage */
570         used = ctx->used;
571 
572         /*
573          * Make sure sufficient data is present -- note, the same check is
574          * is also present in sendmsg/sendpage. The checks in sendpage/sendmsg
575          * shall provide an information to the data sender that something is
576          * wrong, but they are irrelevant to maintain the kernel integrity.
577          * We need this check here too in case user space decides to not honor
578          * the error message in sendmsg/sendpage and still call recvmsg. This
579          * check here protects the kernel integrity.
580          */
581         if (!aead_sufficient_data(ctx))
582                 goto unlock;
583 
584         /*
585          * Calculate the minimum output buffer size holding the result of the
586          * cipher operation. When encrypting data, the receiving buffer is
587          * larger by the tag length compared to the input buffer as the
588          * encryption operation generates the tag. For decryption, the input
589          * buffer provides the tag which is consumed resulting in only the
590          * plaintext without a buffer for the tag returned to the caller.
591          */
592         if (ctx->enc)
593                 outlen = used + as;
594         else
595                 outlen = used - as;
596 
597         /*
598          * The cipher operation input data is reduced by the associated data
599          * length as this data is processed separately later on.
600          */
601         used -= ctx->aead_assoclen;
602 
603         /* convert iovecs of output buffers into scatterlists */
604         while (outlen > usedpages && iov_iter_count(&msg->msg_iter)) {
605                 size_t seglen = min_t(size_t, iov_iter_count(&msg->msg_iter),
606                                       (outlen - usedpages));
607 
608                 if (list_empty(&ctx->list)) {
609                         rsgl = &ctx->first_rsgl;
610                 } else {
611                         rsgl = sock_kmalloc(sk, sizeof(*rsgl), GFP_KERNEL);
612                         if (unlikely(!rsgl)) {
613                                 err = -ENOMEM;
614                                 goto unlock;
615                         }
616                 }
617                 rsgl->sgl.npages = 0;
618                 list_add_tail(&rsgl->list, &ctx->list);
619 
620                 /* make one iovec available as scatterlist */
621                 err = af_alg_make_sg(&rsgl->sgl, &msg->msg_iter, seglen);
622                 if (err < 0)
623                         goto unlock;
624                 usedpages += err;
625                 /* chain the new scatterlist with previous one */
626                 if (last_rsgl)
627                         af_alg_link_sg(&last_rsgl->sgl, &rsgl->sgl);
628 
629                 last_rsgl = rsgl;
630 
631                 iov_iter_advance(&msg->msg_iter, err);
632         }
633 
634         /* ensure output buffer is sufficiently large */
635         if (usedpages < outlen) {
636                 err = -EINVAL;
637                 goto unlock;
638         }
639 
640         sg_mark_end(sgl->sg + sgl->cur - 1);
641         aead_request_set_crypt(&ctx->aead_req, sgl->sg, ctx->first_rsgl.sgl.sg,
642                                used, ctx->iv);
643         aead_request_set_ad(&ctx->aead_req, ctx->aead_assoclen);
644 
645         err = af_alg_wait_for_completion(ctx->enc ?
646                                          crypto_aead_encrypt(&ctx->aead_req) :
647                                          crypto_aead_decrypt(&ctx->aead_req),
648                                          &ctx->completion);
649 
650         if (err) {
651                 /* EBADMSG implies a valid cipher operation took place */
652                 if (err == -EBADMSG)
653                         aead_put_sgl(sk);
654 
655                 goto unlock;
656         }
657 
658         aead_put_sgl(sk);
659         err = 0;
660 
661 unlock:
662         list_for_each_entry_safe(rsgl, tmp, &ctx->list, list) {
663                 af_alg_free_sg(&rsgl->sgl);
664                 list_del(&rsgl->list);
665                 if (rsgl != &ctx->first_rsgl)
666                         sock_kfree_s(sk, rsgl, sizeof(*rsgl));
667         }
668         INIT_LIST_HEAD(&ctx->list);
669         aead_wmem_wakeup(sk);
670         release_sock(sk);
671 
672         return err ? err : outlen;
673 }
674 
675 static int aead_recvmsg(struct socket *sock, struct msghdr *msg, size_t ignored,
676                         int flags)
677 {
678         return (msg->msg_iocb && !is_sync_kiocb(msg->msg_iocb)) ?
679                 aead_recvmsg_async(sock, msg, flags) :
680                 aead_recvmsg_sync(sock, msg, flags);
681 }
682 
683 static unsigned int aead_poll(struct file *file, struct socket *sock,
684                               poll_table *wait)
685 {
686         struct sock *sk = sock->sk;
687         struct alg_sock *ask = alg_sk(sk);
688         struct aead_ctx *ctx = ask->private;
689         unsigned int mask;
690 
691         sock_poll_wait(file, sk_sleep(sk), wait);
692         mask = 0;
693 
694         if (!ctx->more)
695                 mask |= POLLIN | POLLRDNORM;
696 
697         if (aead_writable(sk))
698                 mask |= POLLOUT | POLLWRNORM | POLLWRBAND;
699 
700         return mask;
701 }
702 
703 static struct proto_ops algif_aead_ops = {
704         .family         =       PF_ALG,
705 
706         .connect        =       sock_no_connect,
707         .socketpair     =       sock_no_socketpair,
708         .getname        =       sock_no_getname,
709         .ioctl          =       sock_no_ioctl,
710         .listen         =       sock_no_listen,
711         .shutdown       =       sock_no_shutdown,
712         .getsockopt     =       sock_no_getsockopt,
713         .mmap           =       sock_no_mmap,
714         .bind           =       sock_no_bind,
715         .accept         =       sock_no_accept,
716         .setsockopt     =       sock_no_setsockopt,
717 
718         .release        =       af_alg_release,
719         .sendmsg        =       aead_sendmsg,
720         .sendpage       =       aead_sendpage,
721         .recvmsg        =       aead_recvmsg,
722         .poll           =       aead_poll,
723 };
724 
725 static void *aead_bind(const char *name, u32 type, u32 mask)
726 {
727         return crypto_alloc_aead(name, type, mask);
728 }
729 
730 static void aead_release(void *private)
731 {
732         crypto_free_aead(private);
733 }
734 
735 static int aead_setauthsize(void *private, unsigned int authsize)
736 {
737         return crypto_aead_setauthsize(private, authsize);
738 }
739 
740 static int aead_setkey(void *private, const u8 *key, unsigned int keylen)
741 {
742         return crypto_aead_setkey(private, key, keylen);
743 }
744 
745 static void aead_sock_destruct(struct sock *sk)
746 {
747         struct alg_sock *ask = alg_sk(sk);
748         struct aead_ctx *ctx = ask->private;
749         unsigned int ivlen = crypto_aead_ivsize(
750                                 crypto_aead_reqtfm(&ctx->aead_req));
751 
752         WARN_ON(atomic_read(&sk->sk_refcnt) != 0);
753         aead_put_sgl(sk);
754         sock_kzfree_s(sk, ctx->iv, ivlen);
755         sock_kfree_s(sk, ctx, ctx->len);
756         af_alg_release_parent(sk);
757 }
758 
759 static int aead_accept_parent(void *private, struct sock *sk)
760 {
761         struct aead_ctx *ctx;
762         struct alg_sock *ask = alg_sk(sk);
763         unsigned int len = sizeof(*ctx) + crypto_aead_reqsize(private);
764         unsigned int ivlen = crypto_aead_ivsize(private);
765 
766         ctx = sock_kmalloc(sk, len, GFP_KERNEL);
767         if (!ctx)
768                 return -ENOMEM;
769         memset(ctx, 0, len);
770 
771         ctx->iv = sock_kmalloc(sk, ivlen, GFP_KERNEL);
772         if (!ctx->iv) {
773                 sock_kfree_s(sk, ctx, len);
774                 return -ENOMEM;
775         }
776         memset(ctx->iv, 0, ivlen);
777 
778         ctx->len = len;
779         ctx->used = 0;
780         ctx->more = 0;
781         ctx->merge = 0;
782         ctx->enc = 0;
783         ctx->tsgl.cur = 0;
784         ctx->aead_assoclen = 0;
785         af_alg_init_completion(&ctx->completion);
786         sg_init_table(ctx->tsgl.sg, ALG_MAX_PAGES);
787         INIT_LIST_HEAD(&ctx->list);
788 
789         ask->private = ctx;
790 
791         aead_request_set_tfm(&ctx->aead_req, private);
792         aead_request_set_callback(&ctx->aead_req, CRYPTO_TFM_REQ_MAY_BACKLOG,
793                                   af_alg_complete, &ctx->completion);
794 
795         sk->sk_destruct = aead_sock_destruct;
796 
797         return 0;
798 }
799 
800 static const struct af_alg_type algif_type_aead = {
801         .bind           =       aead_bind,
802         .release        =       aead_release,
803         .setkey         =       aead_setkey,
804         .setauthsize    =       aead_setauthsize,
805         .accept         =       aead_accept_parent,
806         .ops            =       &algif_aead_ops,
807         .name           =       "aead",
808         .owner          =       THIS_MODULE
809 };
810 
811 static int __init algif_aead_init(void)
812 {
813         return af_alg_register_type(&algif_type_aead);
814 }
815 
816 static void __exit algif_aead_exit(void)
817 {
818         int err = af_alg_unregister_type(&algif_type_aead);
819         BUG_ON(err);
820 }
821 
822 module_init(algif_aead_init);
823 module_exit(algif_aead_exit);
824 MODULE_LICENSE("GPL");
825 MODULE_AUTHOR("Stephan Mueller <smueller@chronox.de>");
826 MODULE_DESCRIPTION("AEAD kernel crypto API user space interface");
827 

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