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crypto: algif - change algif_skcipher to be asynchronous

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The way the algif_skcipher works currently is that on sendmsg/sendpage it
builds an sgl for the input data and then on read/recvmsg it sends the job
for encryption putting the user to sleep till the data is processed.
This way it can only handle one job at a given time.
This patch changes it to be asynchronous by adding AIO support.

Signed-off-by: Tadeusz Struk <tadeusz.struk@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Tadeusz Struk 2015-03-19 12:31:40 -07:00 committed by David S. Miller
parent 66db37391d
commit a596999b7d
1 changed files with 226 additions and 7 deletions
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233
crypto/algif_skcipher.c
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@ -39,6 +39,7 @@ struct skcipher_ctx {
struct af_alg_completion completion;
atomic_t inflight;
unsigned used;
unsigned int len;
@ -49,9 +50,65 @@ struct skcipher_ctx {
struct ablkcipher_request req;
};
struct skcipher_async_rsgl {
struct af_alg_sgl sgl;
struct list_head list;
};
struct skcipher_async_req {
struct kiocb *iocb;
struct skcipher_async_rsgl first_sgl;
struct list_head list;
struct scatterlist *tsg;
char iv[];
};
#define GET_SREQ(areq, ctx) (struct skcipher_async_req *)((char *)areq + \
crypto_ablkcipher_reqsize(crypto_ablkcipher_reqtfm(&ctx->req)))
#define GET_REQ_SIZE(ctx) \
crypto_ablkcipher_reqsize(crypto_ablkcipher_reqtfm(&ctx->req))
#define GET_IV_SIZE(ctx) \
crypto_ablkcipher_ivsize(crypto_ablkcipher_reqtfm(&ctx->req))
#define MAX_SGL_ENTS ((4096 - sizeof(struct skcipher_sg_list)) / \
sizeof(struct scatterlist) - 1)
static void skcipher_free_async_sgls(struct skcipher_async_req *sreq)
{
struct skcipher_async_rsgl *rsgl, *tmp;
struct scatterlist *sgl;
struct scatterlist *sg;
int i, n;
list_for_each_entry_safe(rsgl, tmp, &sreq->list, list) {
af_alg_free_sg(&rsgl->sgl);
if (rsgl != &sreq->first_sgl)
kfree(rsgl);
}
sgl = sreq->tsg;
n = sg_nents(sgl);
for_each_sg(sgl, sg, n, i)
put_page(sg_page(sg));
kfree(sreq->tsg);
}
static void skcipher_async_cb(struct crypto_async_request *req, int err)
{
struct sock *sk = req->data;
struct alg_sock *ask = alg_sk(sk);
struct skcipher_ctx *ctx = ask->private;
struct skcipher_async_req *sreq = GET_SREQ(req, ctx);
struct kiocb *iocb = sreq->iocb;
atomic_dec(&ctx->inflight);
skcipher_free_async_sgls(sreq);
kfree(req);
aio_complete(iocb, err, err);
}
static inline int skcipher_sndbuf(struct sock *sk)
{
struct alg_sock *ask = alg_sk(sk);
@ -96,7 +153,7 @@ static int skcipher_alloc_sgl(struct sock *sk)
return 0;
}
static void skcipher_pull_sgl(struct sock *sk, int used)
static void skcipher_pull_sgl(struct sock *sk, int used, int put)
{
struct alg_sock *ask = alg_sk(sk);
struct skcipher_ctx *ctx = ask->private;
@ -123,8 +180,8 @@ static void skcipher_pull_sgl(struct sock *sk, int used)
if (sg[i].length)
return;
put_page(sg_page(sg + i));
if (put)
put_page(sg_page(sg + i));
sg_assign_page(sg + i, NULL);
}
@ -143,7 +200,7 @@ static void skcipher_free_sgl(struct sock *sk)
struct alg_sock *ask = alg_sk(sk);
struct skcipher_ctx *ctx = ask->private;
skcipher_pull_sgl(sk, ctx->used);
skcipher_pull_sgl(sk, ctx->used, 1);
}
static int skcipher_wait_for_wmem(struct sock *sk, unsigned flags)
@ -424,8 +481,149 @@ unlock:
return err ?: size;
}
static int skcipher_recvmsg(struct socket *sock, struct msghdr *msg,
size_t ignored, int flags)
static int skcipher_all_sg_nents(struct skcipher_ctx *ctx)
{
struct skcipher_sg_list *sgl;
struct scatterlist *sg;
int nents = 0;
list_for_each_entry(sgl, &ctx->tsgl, list) {
sg = sgl->sg;
while (!sg->length)
sg++;
nents += sg_nents(sg);
}
return nents;
}
static int skcipher_recvmsg_async(struct socket *sock, struct msghdr *msg,
int flags)
{
struct sock *sk = sock->sk;
struct alg_sock *ask = alg_sk(sk);
struct skcipher_ctx *ctx = ask->private;
struct skcipher_sg_list *sgl;
struct scatterlist *sg;
struct skcipher_async_req *sreq;
struct ablkcipher_request *req;
struct skcipher_async_rsgl *last_rsgl = NULL;
unsigned int len = 0, tx_nents = skcipher_all_sg_nents(ctx);
unsigned int reqlen = sizeof(struct skcipher_async_req) +
GET_REQ_SIZE(ctx) + GET_IV_SIZE(ctx);
int i = 0;
int err = -ENOMEM;
lock_sock(sk);
req = kmalloc(reqlen, GFP_KERNEL);
if (unlikely(!req))
goto unlock;
sreq = GET_SREQ(req, ctx);
sreq->iocb = msg->msg_iocb;
memset(&sreq->first_sgl, '\0', sizeof(struct skcipher_async_rsgl));
INIT_LIST_HEAD(&sreq->list);
sreq->tsg = kcalloc(tx_nents, sizeof(*sg), GFP_KERNEL);
if (unlikely(!sreq->tsg)) {
kfree(req);
goto unlock;
}
sg_init_table(sreq->tsg, tx_nents);
memcpy(sreq->iv, ctx->iv, GET_IV_SIZE(ctx));
ablkcipher_request_set_tfm(req, crypto_ablkcipher_reqtfm(&ctx->req));
ablkcipher_request_set_callback(req, CRYPTO_TFM_REQ_MAY_BACKLOG,
skcipher_async_cb, sk);
while (iov_iter_count(&msg->msg_iter)) {
struct skcipher_async_rsgl *rsgl;
unsigned long used;
if (!ctx->used) {
err = skcipher_wait_for_data(sk, flags);
if (err)
goto free;
}
sgl = list_first_entry(&ctx->tsgl,
struct skcipher_sg_list, list);
sg = sgl->sg;
while (!sg->length)
sg++;
used = min_t(unsigned long, ctx->used,
iov_iter_count(&msg->msg_iter));
used = min_t(unsigned long, used, sg->length);
if (i == tx_nents) {
struct scatterlist *tmp;
int x;
/* Ran out of tx slots in async request
* need to expand */
tmp = kcalloc(tx_nents * 2, sizeof(*tmp),
GFP_KERNEL);
if (!tmp)
goto free;
sg_init_table(tmp, tx_nents * 2);
for (x = 0; x < tx_nents; x++)
sg_set_page(&tmp[x], sg_page(&sreq->tsg[x]),
sreq->tsg[x].length,
sreq->tsg[x].offset);
kfree(sreq->tsg);
sreq->tsg = tmp;
tx_nents *= 2;
}
/* Need to take over the tx sgl from ctx
* to the asynch req - these sgls will be freed later */
sg_set_page(sreq->tsg + i++, sg_page(sg), sg->length,
sg->offset);
if (list_empty(&sreq->list)) {
rsgl = &sreq->first_sgl;
list_add_tail(&rsgl->list, &sreq->list);
} else {
rsgl = kzalloc(sizeof(*rsgl), GFP_KERNEL);
if (!rsgl) {
err = -ENOMEM;
goto free;
}
list_add_tail(&rsgl->list, &sreq->list);
}
used = af_alg_make_sg(&rsgl->sgl, &msg->msg_iter, used);
err = used;
if (used < 0)
goto free;
if (last_rsgl)
af_alg_link_sg(&last_rsgl->sgl, &rsgl->sgl);
last_rsgl = rsgl;
len += used;
skcipher_pull_sgl(sk, used, 0);
iov_iter_advance(&msg->msg_iter, used);
}
ablkcipher_request_set_crypt(req, sreq->tsg, sreq->first_sgl.sgl.sg,
len, sreq->iv);
err = ctx->enc ? crypto_ablkcipher_encrypt(req) :
crypto_ablkcipher_decrypt(req);
if (err == -EINPROGRESS) {
atomic_inc(&ctx->inflight);
err = -EIOCBQUEUED;
goto unlock;
}
free:
skcipher_free_async_sgls(sreq);
kfree(req);
unlock:
skcipher_wmem_wakeup(sk);
release_sock(sk);
return err;
}
static int skcipher_recvmsg_sync(struct socket *sock, struct msghdr *msg,
int flags)
{
struct sock *sk = sock->sk;
struct alg_sock *ask = alg_sk(sk);
@ -484,7 +682,7 @@ free:
goto unlock;
copied += used;
skcipher_pull_sgl(sk, used);
skcipher_pull_sgl(sk, used, 1);
iov_iter_advance(&msg->msg_iter, used);
}
@ -497,6 +695,13 @@ unlock:
return copied ?: err;
}
static int skcipher_recvmsg(struct socket *sock, struct msghdr *msg,
size_t ignored, int flags)
{
return (msg->msg_iocb && !is_sync_kiocb(msg->msg_iocb)) ?
skcipher_recvmsg_async(sock, msg, flags) :
skcipher_recvmsg_sync(sock, msg, flags);
}
static unsigned int skcipher_poll(struct file *file, struct socket *sock,
poll_table *wait)
@ -555,12 +760,25 @@ static int skcipher_setkey(void *private, const u8 *key, unsigned int keylen)
return crypto_ablkcipher_setkey(private, key, keylen);
}
static void skcipher_wait(struct sock *sk)
{
struct alg_sock *ask = alg_sk(sk);
struct skcipher_ctx *ctx = ask->private;
int ctr = 0;
while (atomic_read(&ctx->inflight) && ctr++ < 100)
msleep(100);
}
static void skcipher_sock_destruct(struct sock *sk)
{
struct alg_sock *ask = alg_sk(sk);
struct skcipher_ctx *ctx = ask->private;
struct crypto_ablkcipher *tfm = crypto_ablkcipher_reqtfm(&ctx->req);
if (atomic_read(&ctx->inflight))
skcipher_wait(sk);
skcipher_free_sgl(sk);
sock_kzfree_s(sk, ctx->iv, crypto_ablkcipher_ivsize(tfm));
sock_kfree_s(sk, ctx, ctx->len);
@ -592,6 +810,7 @@ static int skcipher_accept_parent(void *private, struct sock *sk)
ctx->more = 0;
ctx->merge = 0;
ctx->enc = 0;
atomic_set(&ctx->inflight, 0);
af_alg_init_completion(&ctx->completion);
ask->private = ctx;