2 * af_alg: User-space algorithm interface
4 * This file provides the user-space API for algorithms.
6 * Copyright (c) 2010 Herbert Xu <herbert@gondor.apana.org.au>
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU General Public License as published by the Free
10 * Software Foundation; either version 2 of the License, or (at your option)
15 #include <linux/atomic.h>
16 #include <crypto/if_alg.h>
17 #include <linux/crypto.h>
18 #include <linux/init.h>
19 #include <linux/kernel.h>
20 #include <linux/list.h>
21 #include <linux/module.h>
22 #include <linux/net.h>
23 #include <linux/rwsem.h>
24 #include <linux/sched/signal.h>
25 #include <linux/security.h>
27 struct alg_type_list
{
28 const struct af_alg_type
*type
;
29 struct list_head list
;
32 static atomic_long_t alg_memory_allocated
;
34 static struct proto alg_proto
= {
37 .memory_allocated
= &alg_memory_allocated
,
38 .obj_size
= sizeof(struct alg_sock
),
41 static LIST_HEAD(alg_types
);
42 static DECLARE_RWSEM(alg_types_sem
);
44 static const struct af_alg_type
*alg_get_type(const char *name
)
46 const struct af_alg_type
*type
= ERR_PTR(-ENOENT
);
47 struct alg_type_list
*node
;
49 down_read(&alg_types_sem
);
50 list_for_each_entry(node
, &alg_types
, list
) {
51 if (strcmp(node
->type
->name
, name
))
54 if (try_module_get(node
->type
->owner
))
58 up_read(&alg_types_sem
);
63 int af_alg_register_type(const struct af_alg_type
*type
)
65 struct alg_type_list
*node
;
68 down_write(&alg_types_sem
);
69 list_for_each_entry(node
, &alg_types
, list
) {
70 if (!strcmp(node
->type
->name
, type
->name
))
74 node
= kmalloc(sizeof(*node
), GFP_KERNEL
);
79 type
->ops
->owner
= THIS_MODULE
;
81 type
->ops_nokey
->owner
= THIS_MODULE
;
83 list_add(&node
->list
, &alg_types
);
87 up_write(&alg_types_sem
);
91 EXPORT_SYMBOL_GPL(af_alg_register_type
);
93 int af_alg_unregister_type(const struct af_alg_type
*type
)
95 struct alg_type_list
*node
;
98 down_write(&alg_types_sem
);
99 list_for_each_entry(node
, &alg_types
, list
) {
100 if (strcmp(node
->type
->name
, type
->name
))
103 list_del(&node
->list
);
108 up_write(&alg_types_sem
);
112 EXPORT_SYMBOL_GPL(af_alg_unregister_type
);
114 static void alg_do_release(const struct af_alg_type
*type
, void *private)
119 type
->release(private);
120 module_put(type
->owner
);
123 int af_alg_release(struct socket
*sock
)
131 EXPORT_SYMBOL_GPL(af_alg_release
);
133 void af_alg_release_parent(struct sock
*sk
)
135 struct alg_sock
*ask
= alg_sk(sk
);
136 unsigned int nokey
= ask
->nokey_refcnt
;
137 bool last
= nokey
&& !ask
->refcnt
;
143 ask
->nokey_refcnt
-= nokey
;
145 last
= !--ask
->refcnt
;
151 EXPORT_SYMBOL_GPL(af_alg_release_parent
);
153 static int alg_bind(struct socket
*sock
, struct sockaddr
*uaddr
, int addr_len
)
155 const u32 allowed
= CRYPTO_ALG_KERN_DRIVER_ONLY
;
156 struct sock
*sk
= sock
->sk
;
157 struct alg_sock
*ask
= alg_sk(sk
);
158 struct sockaddr_alg
*sa
= (void *)uaddr
;
159 const struct af_alg_type
*type
;
163 if (sock
->state
== SS_CONNECTED
)
166 if (addr_len
< sizeof(*sa
))
169 /* If caller uses non-allowed flag, return error. */
170 if ((sa
->salg_feat
& ~allowed
) || (sa
->salg_mask
& ~allowed
))
173 sa
->salg_type
[sizeof(sa
->salg_type
) - 1] = 0;
174 sa
->salg_name
[sizeof(sa
->salg_name
) + addr_len
- sizeof(*sa
) - 1] = 0;
176 type
= alg_get_type(sa
->salg_type
);
177 if (IS_ERR(type
) && PTR_ERR(type
) == -ENOENT
) {
178 request_module("algif-%s", sa
->salg_type
);
179 type
= alg_get_type(sa
->salg_type
);
183 return PTR_ERR(type
);
185 private = type
->bind(sa
->salg_name
, sa
->salg_feat
, sa
->salg_mask
);
186 if (IS_ERR(private)) {
187 module_put(type
->owner
);
188 return PTR_ERR(private);
193 if (ask
->refcnt
| ask
->nokey_refcnt
)
196 swap(ask
->type
, type
);
197 swap(ask
->private, private);
204 alg_do_release(type
, private);
209 static int alg_setkey(struct sock
*sk
, char __user
*ukey
,
212 struct alg_sock
*ask
= alg_sk(sk
);
213 const struct af_alg_type
*type
= ask
->type
;
217 key
= sock_kmalloc(sk
, keylen
, GFP_KERNEL
);
222 if (copy_from_user(key
, ukey
, keylen
))
225 err
= type
->setkey(ask
->private, key
, keylen
);
228 sock_kzfree_s(sk
, key
, keylen
);
233 static int alg_setsockopt(struct socket
*sock
, int level
, int optname
,
234 char __user
*optval
, unsigned int optlen
)
236 struct sock
*sk
= sock
->sk
;
237 struct alg_sock
*ask
= alg_sk(sk
);
238 const struct af_alg_type
*type
;
248 if (level
!= SOL_ALG
|| !type
)
253 if (sock
->state
== SS_CONNECTED
)
258 err
= alg_setkey(sk
, optval
, optlen
);
260 case ALG_SET_AEAD_AUTHSIZE
:
261 if (sock
->state
== SS_CONNECTED
)
263 if (!type
->setauthsize
)
265 err
= type
->setauthsize(ask
->private, optlen
);
274 int af_alg_accept(struct sock
*sk
, struct socket
*newsock
, bool kern
)
276 struct alg_sock
*ask
= alg_sk(sk
);
277 const struct af_alg_type
*type
;
289 sk2
= sk_alloc(sock_net(sk
), PF_ALG
, GFP_KERNEL
, &alg_proto
, kern
);
294 sock_init_data(newsock
, sk2
);
295 security_sock_graft(sk2
, newsock
);
296 security_sk_clone(sk
, sk2
);
298 err
= type
->accept(ask
->private, sk2
);
300 nokey
= err
== -ENOKEY
;
301 if (nokey
&& type
->accept_nokey
)
302 err
= type
->accept_nokey(ask
->private, sk2
);
307 sk2
->sk_family
= PF_ALG
;
309 if (nokey
|| !ask
->refcnt
++)
311 ask
->nokey_refcnt
+= nokey
;
312 alg_sk(sk2
)->parent
= sk
;
313 alg_sk(sk2
)->type
= type
;
314 alg_sk(sk2
)->nokey_refcnt
= nokey
;
316 newsock
->ops
= type
->ops
;
317 newsock
->state
= SS_CONNECTED
;
320 newsock
->ops
= type
->ops_nokey
;
329 EXPORT_SYMBOL_GPL(af_alg_accept
);
331 static int alg_accept(struct socket
*sock
, struct socket
*newsock
, int flags
,
334 return af_alg_accept(sock
->sk
, newsock
, kern
);
337 static const struct proto_ops alg_proto_ops
= {
339 .owner
= THIS_MODULE
,
341 .connect
= sock_no_connect
,
342 .socketpair
= sock_no_socketpair
,
343 .getname
= sock_no_getname
,
344 .ioctl
= sock_no_ioctl
,
345 .listen
= sock_no_listen
,
346 .shutdown
= sock_no_shutdown
,
347 .getsockopt
= sock_no_getsockopt
,
348 .mmap
= sock_no_mmap
,
349 .sendpage
= sock_no_sendpage
,
350 .sendmsg
= sock_no_sendmsg
,
351 .recvmsg
= sock_no_recvmsg
,
352 .poll
= sock_no_poll
,
355 .release
= af_alg_release
,
356 .setsockopt
= alg_setsockopt
,
357 .accept
= alg_accept
,
360 static void alg_sock_destruct(struct sock
*sk
)
362 struct alg_sock
*ask
= alg_sk(sk
);
364 alg_do_release(ask
->type
, ask
->private);
367 static int alg_create(struct net
*net
, struct socket
*sock
, int protocol
,
373 if (sock
->type
!= SOCK_SEQPACKET
)
374 return -ESOCKTNOSUPPORT
;
376 return -EPROTONOSUPPORT
;
379 sk
= sk_alloc(net
, PF_ALG
, GFP_KERNEL
, &alg_proto
, kern
);
383 sock
->ops
= &alg_proto_ops
;
384 sock_init_data(sock
, sk
);
386 sk
->sk_family
= PF_ALG
;
387 sk
->sk_destruct
= alg_sock_destruct
;
394 static const struct net_proto_family alg_family
= {
396 .create
= alg_create
,
397 .owner
= THIS_MODULE
,
400 int af_alg_make_sg(struct af_alg_sgl
*sgl
, struct iov_iter
*iter
, int len
)
406 n
= iov_iter_get_pages(iter
, sgl
->pages
, len
, ALG_MAX_PAGES
, &off
);
410 npages
= (off
+ n
+ PAGE_SIZE
- 1) >> PAGE_SHIFT
;
411 if (WARN_ON(npages
== 0))
413 /* Add one extra for linking */
414 sg_init_table(sgl
->sg
, npages
+ 1);
416 for (i
= 0, len
= n
; i
< npages
; i
++) {
417 int plen
= min_t(int, len
, PAGE_SIZE
- off
);
419 sg_set_page(sgl
->sg
+ i
, sgl
->pages
[i
], plen
, off
);
424 sg_mark_end(sgl
->sg
+ npages
- 1);
425 sgl
->npages
= npages
;
429 EXPORT_SYMBOL_GPL(af_alg_make_sg
);
431 void af_alg_link_sg(struct af_alg_sgl
*sgl_prev
, struct af_alg_sgl
*sgl_new
)
433 sg_unmark_end(sgl_prev
->sg
+ sgl_prev
->npages
- 1);
434 sg_chain(sgl_prev
->sg
, sgl_prev
->npages
+ 1, sgl_new
->sg
);
436 EXPORT_SYMBOL_GPL(af_alg_link_sg
);
438 void af_alg_free_sg(struct af_alg_sgl
*sgl
)
442 for (i
= 0; i
< sgl
->npages
; i
++)
443 put_page(sgl
->pages
[i
]);
445 EXPORT_SYMBOL_GPL(af_alg_free_sg
);
447 int af_alg_cmsg_send(struct msghdr
*msg
, struct af_alg_control
*con
)
449 struct cmsghdr
*cmsg
;
451 for_each_cmsghdr(cmsg
, msg
) {
452 if (!CMSG_OK(msg
, cmsg
))
454 if (cmsg
->cmsg_level
!= SOL_ALG
)
457 switch (cmsg
->cmsg_type
) {
459 if (cmsg
->cmsg_len
< CMSG_LEN(sizeof(*con
->iv
)))
461 con
->iv
= (void *)CMSG_DATA(cmsg
);
462 if (cmsg
->cmsg_len
< CMSG_LEN(con
->iv
->ivlen
+
468 if (cmsg
->cmsg_len
< CMSG_LEN(sizeof(u32
)))
470 con
->op
= *(u32
*)CMSG_DATA(cmsg
);
473 case ALG_SET_AEAD_ASSOCLEN
:
474 if (cmsg
->cmsg_len
< CMSG_LEN(sizeof(u32
)))
476 con
->aead_assoclen
= *(u32
*)CMSG_DATA(cmsg
);
486 EXPORT_SYMBOL_GPL(af_alg_cmsg_send
);
488 int af_alg_wait_for_completion(int err
, struct af_alg_completion
*completion
)
493 wait_for_completion(&completion
->completion
);
494 reinit_completion(&completion
->completion
);
495 err
= completion
->err
;
501 EXPORT_SYMBOL_GPL(af_alg_wait_for_completion
);
503 void af_alg_complete(struct crypto_async_request
*req
, int err
)
505 struct af_alg_completion
*completion
= req
->data
;
507 if (err
== -EINPROGRESS
)
510 completion
->err
= err
;
511 complete(&completion
->completion
);
513 EXPORT_SYMBOL_GPL(af_alg_complete
);
516 * af_alg_alloc_tsgl - allocate the TX SGL
518 * @sk socket of connection to user space
519 * @return: 0 upon success, < 0 upon error
521 int af_alg_alloc_tsgl(struct sock
*sk
)
523 struct alg_sock
*ask
= alg_sk(sk
);
524 struct af_alg_ctx
*ctx
= ask
->private;
525 struct af_alg_tsgl
*sgl
;
526 struct scatterlist
*sg
= NULL
;
528 sgl
= list_entry(ctx
->tsgl_list
.prev
, struct af_alg_tsgl
, list
);
529 if (!list_empty(&ctx
->tsgl_list
))
532 if (!sg
|| sgl
->cur
>= MAX_SGL_ENTS
) {
533 sgl
= sock_kmalloc(sk
, sizeof(*sgl
) +
534 sizeof(sgl
->sg
[0]) * (MAX_SGL_ENTS
+ 1),
539 sg_init_table(sgl
->sg
, MAX_SGL_ENTS
+ 1);
543 sg_chain(sg
, MAX_SGL_ENTS
+ 1, sgl
->sg
);
545 list_add_tail(&sgl
->list
, &ctx
->tsgl_list
);
550 EXPORT_SYMBOL_GPL(af_alg_alloc_tsgl
);
553 * aead_count_tsgl - Count number of TX SG entries
555 * The counting starts from the beginning of the SGL to @bytes. If
556 * an offset is provided, the counting of the SG entries starts at the offset.
558 * @sk socket of connection to user space
559 * @bytes Count the number of SG entries holding given number of bytes.
560 * @offset Start the counting of SG entries from the given offset.
561 * @return Number of TX SG entries found given the constraints
563 unsigned int af_alg_count_tsgl(struct sock
*sk
, size_t bytes
, size_t offset
)
565 struct alg_sock
*ask
= alg_sk(sk
);
566 struct af_alg_ctx
*ctx
= ask
->private;
567 struct af_alg_tsgl
*sgl
, *tmp
;
569 unsigned int sgl_count
= 0;
574 list_for_each_entry_safe(sgl
, tmp
, &ctx
->tsgl_list
, list
) {
575 struct scatterlist
*sg
= sgl
->sg
;
577 for (i
= 0; i
< sgl
->cur
; i
++) {
581 if (offset
>= sg
[i
].length
) {
582 offset
-= sg
[i
].length
;
583 bytes
-= sg
[i
].length
;
587 bytes_count
= sg
[i
].length
- offset
;
592 /* If we have seen requested number of bytes, stop */
593 if (bytes_count
>= bytes
)
596 bytes
-= bytes_count
;
602 EXPORT_SYMBOL_GPL(af_alg_count_tsgl
);
605 * aead_pull_tsgl - Release the specified buffers from TX SGL
607 * If @dst is non-null, reassign the pages to dst. The caller must release
608 * the pages. If @dst_offset is given only reassign the pages to @dst starting
609 * at the @dst_offset (byte). The caller must ensure that @dst is large
610 * enough (e.g. by using af_alg_count_tsgl with the same offset).
612 * @sk socket of connection to user space
613 * @used Number of bytes to pull from TX SGL
614 * @dst If non-NULL, buffer is reassigned to dst SGL instead of releasing. The
615 * caller must release the buffers in dst.
616 * @dst_offset Reassign the TX SGL from given offset. All buffers before
617 * reaching the offset is released.
619 void af_alg_pull_tsgl(struct sock
*sk
, size_t used
, struct scatterlist
*dst
,
622 struct alg_sock
*ask
= alg_sk(sk
);
623 struct af_alg_ctx
*ctx
= ask
->private;
624 struct af_alg_tsgl
*sgl
;
625 struct scatterlist
*sg
;
626 unsigned int i
, j
= 0;
628 while (!list_empty(&ctx
->tsgl_list
)) {
629 sgl
= list_first_entry(&ctx
->tsgl_list
, struct af_alg_tsgl
,
633 for (i
= 0; i
< sgl
->cur
; i
++) {
634 size_t plen
= min_t(size_t, used
, sg
[i
].length
);
635 struct page
*page
= sg_page(sg
+ i
);
641 * Assumption: caller created af_alg_count_tsgl(len)
645 if (dst_offset
>= plen
) {
646 /* discard page before offset */
649 /* reassign page to dst after offset */
651 sg_set_page(dst
+ j
, page
,
653 sg
[i
].offset
+ dst_offset
);
659 sg
[i
].length
-= plen
;
660 sg
[i
].offset
+= plen
;
669 sg_assign_page(sg
+ i
, NULL
);
672 list_del(&sgl
->list
);
673 sock_kfree_s(sk
, sgl
, sizeof(*sgl
) + sizeof(sgl
->sg
[0]) *
680 EXPORT_SYMBOL_GPL(af_alg_pull_tsgl
);
683 * af_alg_free_areq_sgls - Release TX and RX SGLs of the request
685 * @areq Request holding the TX and RX SGL
687 void af_alg_free_areq_sgls(struct af_alg_async_req
*areq
)
689 struct sock
*sk
= areq
->sk
;
690 struct alg_sock
*ask
= alg_sk(sk
);
691 struct af_alg_ctx
*ctx
= ask
->private;
692 struct af_alg_rsgl
*rsgl
, *tmp
;
693 struct scatterlist
*tsgl
;
694 struct scatterlist
*sg
;
697 list_for_each_entry_safe(rsgl
, tmp
, &areq
->rsgl_list
, list
) {
698 atomic_sub(rsgl
->sg_num_bytes
, &ctx
->rcvused
);
699 af_alg_free_sg(&rsgl
->sgl
);
700 list_del(&rsgl
->list
);
701 if (rsgl
!= &areq
->first_rsgl
)
702 sock_kfree_s(sk
, rsgl
, sizeof(*rsgl
));
707 for_each_sg(tsgl
, sg
, areq
->tsgl_entries
, i
) {
710 put_page(sg_page(sg
));
713 sock_kfree_s(sk
, tsgl
, areq
->tsgl_entries
* sizeof(*tsgl
));
716 EXPORT_SYMBOL_GPL(af_alg_free_areq_sgls
);
719 * af_alg_wait_for_wmem - wait for availability of writable memory
721 * @sk socket of connection to user space
722 * @flags If MSG_DONTWAIT is set, then only report if function would sleep
723 * @return 0 when writable memory is available, < 0 upon error
725 int af_alg_wait_for_wmem(struct sock
*sk
, unsigned int flags
)
727 DEFINE_WAIT_FUNC(wait
, woken_wake_function
);
728 int err
= -ERESTARTSYS
;
731 if (flags
& MSG_DONTWAIT
)
734 sk_set_bit(SOCKWQ_ASYNC_NOSPACE
, sk
);
736 add_wait_queue(sk_sleep(sk
), &wait
);
738 if (signal_pending(current
))
740 timeout
= MAX_SCHEDULE_TIMEOUT
;
741 if (sk_wait_event(sk
, &timeout
, af_alg_writable(sk
), &wait
)) {
746 remove_wait_queue(sk_sleep(sk
), &wait
);
750 EXPORT_SYMBOL_GPL(af_alg_wait_for_wmem
);
753 * af_alg_wmem_wakeup - wakeup caller when writable memory is available
755 * @sk socket of connection to user space
757 void af_alg_wmem_wakeup(struct sock
*sk
)
759 struct socket_wq
*wq
;
761 if (!af_alg_writable(sk
))
765 wq
= rcu_dereference(sk
->sk_wq
);
766 if (skwq_has_sleeper(wq
))
767 wake_up_interruptible_sync_poll(&wq
->wait
, POLLIN
|
770 sk_wake_async(sk
, SOCK_WAKE_WAITD
, POLL_IN
);
773 EXPORT_SYMBOL_GPL(af_alg_wmem_wakeup
);
776 * af_alg_wait_for_data - wait for availability of TX data
778 * @sk socket of connection to user space
779 * @flags If MSG_DONTWAIT is set, then only report if function would sleep
780 * @return 0 when writable memory is available, < 0 upon error
782 int af_alg_wait_for_data(struct sock
*sk
, unsigned flags
)
784 DEFINE_WAIT_FUNC(wait
, woken_wake_function
);
785 struct alg_sock
*ask
= alg_sk(sk
);
786 struct af_alg_ctx
*ctx
= ask
->private;
788 int err
= -ERESTARTSYS
;
790 if (flags
& MSG_DONTWAIT
)
793 sk_set_bit(SOCKWQ_ASYNC_WAITDATA
, sk
);
795 add_wait_queue(sk_sleep(sk
), &wait
);
797 if (signal_pending(current
))
799 timeout
= MAX_SCHEDULE_TIMEOUT
;
800 if (sk_wait_event(sk
, &timeout
, (ctx
->used
|| !ctx
->more
),
806 remove_wait_queue(sk_sleep(sk
), &wait
);
808 sk_clear_bit(SOCKWQ_ASYNC_WAITDATA
, sk
);
812 EXPORT_SYMBOL_GPL(af_alg_wait_for_data
);
815 * af_alg_data_wakeup - wakeup caller when new data can be sent to kernel
817 * @sk socket of connection to user space
820 void af_alg_data_wakeup(struct sock
*sk
)
822 struct alg_sock
*ask
= alg_sk(sk
);
823 struct af_alg_ctx
*ctx
= ask
->private;
824 struct socket_wq
*wq
;
830 wq
= rcu_dereference(sk
->sk_wq
);
831 if (skwq_has_sleeper(wq
))
832 wake_up_interruptible_sync_poll(&wq
->wait
, POLLOUT
|
835 sk_wake_async(sk
, SOCK_WAKE_SPACE
, POLL_OUT
);
838 EXPORT_SYMBOL_GPL(af_alg_data_wakeup
);
841 * af_alg_sendmsg - implementation of sendmsg system call handler
843 * The sendmsg system call handler obtains the user data and stores it
844 * in ctx->tsgl_list. This implies allocation of the required numbers of
845 * struct af_alg_tsgl.
847 * In addition, the ctx is filled with the information sent via CMSG.
849 * @sock socket of connection to user space
850 * @msg message from user space
851 * @size size of message from user space
852 * @ivsize the size of the IV for the cipher operation to verify that the
853 * user-space-provided IV has the right size
854 * @return the number of copied data upon success, < 0 upon error
856 int af_alg_sendmsg(struct socket
*sock
, struct msghdr
*msg
, size_t size
,
859 struct sock
*sk
= sock
->sk
;
860 struct alg_sock
*ask
= alg_sk(sk
);
861 struct af_alg_ctx
*ctx
= ask
->private;
862 struct af_alg_tsgl
*sgl
;
863 struct af_alg_control con
= {};
869 if (msg
->msg_controllen
) {
870 err
= af_alg_cmsg_send(msg
, &con
);
886 if (con
.iv
&& con
.iv
->ivlen
!= ivsize
)
891 if (!ctx
->more
&& ctx
->used
) {
899 memcpy(ctx
->iv
, con
.iv
->iv
, ivsize
);
901 ctx
->aead_assoclen
= con
.aead_assoclen
;
905 struct scatterlist
*sg
;
909 /* use the existing memory in an allocated page */
911 sgl
= list_entry(ctx
->tsgl_list
.prev
,
912 struct af_alg_tsgl
, list
);
913 sg
= sgl
->sg
+ sgl
->cur
- 1;
914 len
= min_t(size_t, len
,
915 PAGE_SIZE
- sg
->offset
- sg
->length
);
917 err
= memcpy_from_msg(page_address(sg_page(sg
)) +
918 sg
->offset
+ sg
->length
,
924 ctx
->merge
= (sg
->offset
+ sg
->length
) &
933 if (!af_alg_writable(sk
)) {
934 err
= af_alg_wait_for_wmem(sk
, msg
->msg_flags
);
939 /* allocate a new page */
940 len
= min_t(unsigned long, len
, af_alg_sndbuf(sk
));
942 err
= af_alg_alloc_tsgl(sk
);
946 sgl
= list_entry(ctx
->tsgl_list
.prev
, struct af_alg_tsgl
,
950 sg_unmark_end(sg
+ sgl
->cur
- 1);
953 unsigned int i
= sgl
->cur
;
955 plen
= min_t(size_t, len
, PAGE_SIZE
);
957 sg_assign_page(sg
+ i
, alloc_page(GFP_KERNEL
));
958 if (!sg_page(sg
+ i
)) {
963 err
= memcpy_from_msg(page_address(sg_page(sg
+ i
)),
966 __free_page(sg_page(sg
+ i
));
967 sg_assign_page(sg
+ i
, NULL
);
977 } while (len
&& sgl
->cur
< MAX_SGL_ENTS
);
980 sg_mark_end(sg
+ sgl
->cur
- 1);
982 ctx
->merge
= plen
& (PAGE_SIZE
- 1);
987 ctx
->more
= msg
->msg_flags
& MSG_MORE
;
990 af_alg_data_wakeup(sk
);
993 return copied
?: err
;
995 EXPORT_SYMBOL_GPL(af_alg_sendmsg
);
998 * af_alg_sendpage - sendpage system call handler
1000 * This is a generic implementation of sendpage to fill ctx->tsgl_list.
1002 ssize_t
af_alg_sendpage(struct socket
*sock
, struct page
*page
,
1003 int offset
, size_t size
, int flags
)
1005 struct sock
*sk
= sock
->sk
;
1006 struct alg_sock
*ask
= alg_sk(sk
);
1007 struct af_alg_ctx
*ctx
= ask
->private;
1008 struct af_alg_tsgl
*sgl
;
1011 if (flags
& MSG_SENDPAGE_NOTLAST
)
1015 if (!ctx
->more
&& ctx
->used
)
1021 if (!af_alg_writable(sk
)) {
1022 err
= af_alg_wait_for_wmem(sk
, flags
);
1027 err
= af_alg_alloc_tsgl(sk
);
1032 sgl
= list_entry(ctx
->tsgl_list
.prev
, struct af_alg_tsgl
, list
);
1035 sg_unmark_end(sgl
->sg
+ sgl
->cur
- 1);
1037 sg_mark_end(sgl
->sg
+ sgl
->cur
);
1040 sg_set_page(sgl
->sg
+ sgl
->cur
, page
, size
, offset
);
1045 ctx
->more
= flags
& MSG_MORE
;
1048 af_alg_data_wakeup(sk
);
1053 EXPORT_SYMBOL_GPL(af_alg_sendpage
);
1056 * af_alg_free_resources - release resources required for crypto request
1058 void af_alg_free_resources(struct af_alg_async_req
*areq
)
1060 struct sock
*sk
= areq
->sk
;
1062 af_alg_free_areq_sgls(areq
);
1063 sock_kfree_s(sk
, areq
, areq
->areqlen
);
1065 EXPORT_SYMBOL_GPL(af_alg_free_resources
);
1068 * af_alg_async_cb - AIO callback handler
1070 * This handler cleans up the struct af_alg_async_req upon completion of the
1073 * The number of bytes to be generated with the AIO operation must be set
1074 * in areq->outlen before the AIO callback handler is invoked.
1076 void af_alg_async_cb(struct crypto_async_request
*_req
, int err
)
1078 struct af_alg_async_req
*areq
= _req
->data
;
1079 struct sock
*sk
= areq
->sk
;
1080 struct kiocb
*iocb
= areq
->iocb
;
1081 unsigned int resultlen
;
1083 /* Buffer size written by crypto operation. */
1084 resultlen
= areq
->outlen
;
1086 af_alg_free_resources(areq
);
1089 iocb
->ki_complete(iocb
, err
? err
: resultlen
, 0);
1091 EXPORT_SYMBOL_GPL(af_alg_async_cb
);
1094 * af_alg_poll - poll system call handler
1096 unsigned int af_alg_poll(struct file
*file
, struct socket
*sock
,
1099 struct sock
*sk
= sock
->sk
;
1100 struct alg_sock
*ask
= alg_sk(sk
);
1101 struct af_alg_ctx
*ctx
= ask
->private;
1104 sock_poll_wait(file
, sk_sleep(sk
), wait
);
1107 if (!ctx
->more
|| ctx
->used
)
1108 mask
|= POLLIN
| POLLRDNORM
;
1110 if (af_alg_writable(sk
))
1111 mask
|= POLLOUT
| POLLWRNORM
| POLLWRBAND
;
1115 EXPORT_SYMBOL_GPL(af_alg_poll
);
1118 * af_alg_alloc_areq - allocate struct af_alg_async_req
1120 * @sk socket of connection to user space
1121 * @areqlen size of struct af_alg_async_req + crypto_*_reqsize
1122 * @return allocated data structure or ERR_PTR upon error
1124 struct af_alg_async_req
*af_alg_alloc_areq(struct sock
*sk
,
1125 unsigned int areqlen
)
1127 struct af_alg_async_req
*areq
= sock_kmalloc(sk
, areqlen
, GFP_KERNEL
);
1129 if (unlikely(!areq
))
1130 return ERR_PTR(-ENOMEM
);
1132 areq
->areqlen
= areqlen
;
1134 areq
->last_rsgl
= NULL
;
1135 INIT_LIST_HEAD(&areq
->rsgl_list
);
1137 areq
->tsgl_entries
= 0;
1141 EXPORT_SYMBOL_GPL(af_alg_alloc_areq
);
1144 * af_alg_get_rsgl - create the RX SGL for the output data from the crypto
1147 * @sk socket of connection to user space
1148 * @msg user space message
1149 * @flags flags used to invoke recvmsg with
1150 * @areq instance of the cryptographic request that will hold the RX SGL
1151 * @maxsize maximum number of bytes to be pulled from user space
1152 * @outlen number of bytes in the RX SGL
1153 * @return 0 on success, < 0 upon error
1155 int af_alg_get_rsgl(struct sock
*sk
, struct msghdr
*msg
, int flags
,
1156 struct af_alg_async_req
*areq
, size_t maxsize
,
1159 struct alg_sock
*ask
= alg_sk(sk
);
1160 struct af_alg_ctx
*ctx
= ask
->private;
1163 while (maxsize
> len
&& msg_data_left(msg
)) {
1164 struct af_alg_rsgl
*rsgl
;
1168 /* limit the amount of readable buffers */
1169 if (!af_alg_readable(sk
))
1172 seglen
= min_t(size_t, (maxsize
- len
),
1173 msg_data_left(msg
));
1175 if (list_empty(&areq
->rsgl_list
)) {
1176 rsgl
= &areq
->first_rsgl
;
1178 rsgl
= sock_kmalloc(sk
, sizeof(*rsgl
), GFP_KERNEL
);
1179 if (unlikely(!rsgl
))
1183 rsgl
->sgl
.npages
= 0;
1184 list_add_tail(&rsgl
->list
, &areq
->rsgl_list
);
1186 /* make one iovec available as scatterlist */
1187 err
= af_alg_make_sg(&rsgl
->sgl
, &msg
->msg_iter
, seglen
);
1189 rsgl
->sg_num_bytes
= 0;
1193 /* chain the new scatterlist with previous one */
1194 if (areq
->last_rsgl
)
1195 af_alg_link_sg(&areq
->last_rsgl
->sgl
, &rsgl
->sgl
);
1197 areq
->last_rsgl
= rsgl
;
1199 atomic_add(err
, &ctx
->rcvused
);
1200 rsgl
->sg_num_bytes
= err
;
1201 iov_iter_advance(&msg
->msg_iter
, err
);
1207 EXPORT_SYMBOL_GPL(af_alg_get_rsgl
);
1209 static int __init
af_alg_init(void)
1211 int err
= proto_register(&alg_proto
, 0);
1216 err
= sock_register(&alg_family
);
1218 goto out_unregister_proto
;
1223 out_unregister_proto
:
1224 proto_unregister(&alg_proto
);
1228 static void __exit
af_alg_exit(void)
1230 sock_unregister(PF_ALG
);
1231 proto_unregister(&alg_proto
);
1234 module_init(af_alg_init
);
1235 module_exit(af_alg_exit
);
1236 MODULE_LICENSE("GPL");
1237 MODULE_ALIAS_NETPROTO(AF_ALG
);