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crypto: af_alg: Use extract_iter_to_sg() to create scatterlists 

Use extract_iter_to_sg() to decant the destination iterator into a
scatterlist in af_alg_get_rsgl().  af_alg_make_sg() can then be removed.

Signed-off-by: David Howells <dhowells@redhat.com>
cc: Herbert Xu <herbert@gondor.apana.org.au>
cc: "David S. Miller" <davem@davemloft.net>
cc: Eric Dumazet <edumazet@google.com>
cc: Jakub Kicinski <kuba@kernel.org>
cc: Paolo Abeni <pabeni@redhat.com>
cc: Jens Axboe <axboe@kernel.dk>
cc: Matthew Wilcox <willy@infradead.org>
cc: linux-crypto@vger.kernel.org
cc: netdev@vger.kernel.org
Acked-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
This commit is contained in:
David Howells 2023-06-06 14:08:52 +01:00 committed by Paolo Abeni
parent f9e7a5fa51
commit c1abe6f570
5 changed files with 40 additions and 59 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

57
crypto/af_alg.c
View File

@ -531,45 +531,11 @@ static const struct net_proto_family alg_family = {
.owner = THIS_MODULE,
};
int af_alg_make_sg(struct af_alg_sgl *sgl, struct iov_iter *iter, int len)
{
struct page **pages = sgl->pages;
size_t off;
ssize_t n;
int npages, i;
n = iov_iter_extract_pages(iter, &pages, len, ALG_MAX_PAGES, 0, &off);
if (n < 0)
return n;
sgl->need_unpin = iov_iter_extract_will_pin(iter);
npages = DIV_ROUND_UP(off + n, PAGE_SIZE);
if (WARN_ON(npages == 0))
return -EINVAL;
/* Add one extra for linking */
sg_init_table(sgl->sg, npages + 1);
for (i = 0, len = n; i < npages; i++) {
int plen = min_t(int, len, PAGE_SIZE - off);
sg_set_page(sgl->sg + i, sgl->pages[i], plen, off);
off = 0;
len -= plen;
}
sg_mark_end(sgl->sg + npages - 1);
sgl->npages = npages;
return n;
}
EXPORT_SYMBOL_GPL(af_alg_make_sg);
static void af_alg_link_sg(struct af_alg_sgl *sgl_prev,
struct af_alg_sgl *sgl_new)
{
sg_unmark_end(sgl_prev->sg + sgl_prev->npages - 1);
sg_chain(sgl_prev->sg, sgl_prev->npages + 1, sgl_new->sg);
sg_unmark_end(sgl_prev->sgt.sgl + sgl_prev->sgt.nents - 1);
sg_chain(sgl_prev->sgt.sgl, sgl_prev->sgt.nents + 1, sgl_new->sgt.sgl);
}
void af_alg_free_sg(struct af_alg_sgl *sgl)
@ -577,8 +543,8 @@ void af_alg_free_sg(struct af_alg_sgl *sgl)
int i;
if (sgl->need_unpin)
for (i = 0; i < sgl->npages; i++)
unpin_user_page(sgl->pages[i]);
for (i = 0; i < sgl->sgt.nents; i++)
unpin_user_page(sg_page(&sgl->sgt.sgl[i]));
}
EXPORT_SYMBOL_GPL(af_alg_free_sg);
@ -1292,8 +1258,8 @@ int af_alg_get_rsgl(struct sock *sk, struct msghdr *msg, int flags,
while (maxsize > len && msg_data_left(msg)) {
struct af_alg_rsgl *rsgl;
ssize_t err;
size_t seglen;
int err;
/* limit the amount of readable buffers */
if (!af_alg_readable(sk))
@ -1310,16 +1276,23 @@ int af_alg_get_rsgl(struct sock *sk, struct msghdr *msg, int flags,
return -ENOMEM;
}
rsgl->sgl.npages = 0;
rsgl->sgl.sgt.sgl = rsgl->sgl.sgl;
rsgl->sgl.sgt.nents = 0;
rsgl->sgl.sgt.orig_nents = 0;
list_add_tail(&rsgl->list, &areq->rsgl_list);
/* make one iovec available as scatterlist */
err = af_alg_make_sg(&rsgl->sgl, &msg->msg_iter, seglen);
sg_init_table(rsgl->sgl.sgt.sgl, ALG_MAX_PAGES);
err = extract_iter_to_sg(&msg->msg_iter, seglen, &rsgl->sgl.sgt,
ALG_MAX_PAGES, 0);
if (err < 0) {
rsgl->sg_num_bytes = 0;
return err;
}
sg_mark_end(rsgl->sgl.sgt.sgl + rsgl->sgl.sgt.nents - 1);
rsgl->sgl.need_unpin =
iov_iter_extract_will_pin(&msg->msg_iter);
/* chain the new scatterlist with previous one */
if (areq->last_rsgl)
af_alg_link_sg(&areq->last_rsgl->sgl, &rsgl->sgl);

16
crypto/algif_aead.c
View File

@ -210,7 +210,7 @@ static int _aead_recvmsg(struct socket *sock, struct msghdr *msg,
*/
/* Use the RX SGL as source (and destination) for crypto op. */
rsgl_src = areq->first_rsgl.sgl.sg;
rsgl_src = areq->first_rsgl.sgl.sgt.sgl;
if (ctx->enc) {
/*
@ -224,7 +224,8 @@ static int _aead_recvmsg(struct socket *sock, struct msghdr *msg,
* RX SGL: AAD || PT || Tag
*/
err = crypto_aead_copy_sgl(null_tfm, tsgl_src,
areq->first_rsgl.sgl.sg, processed);
areq->first_rsgl.sgl.sgt.sgl,
processed);
if (err)
goto free;
af_alg_pull_tsgl(sk, processed, NULL, 0);
@ -242,7 +243,8 @@ static int _aead_recvmsg(struct socket *sock, struct msghdr *msg,
/* Copy AAD || CT to RX SGL buffer for in-place operation. */
err = crypto_aead_copy_sgl(null_tfm, tsgl_src,
areq->first_rsgl.sgl.sg, outlen);
areq->first_rsgl.sgl.sgt.sgl,
outlen);
if (err)
goto free;
@ -267,10 +269,10 @@ static int _aead_recvmsg(struct socket *sock, struct msghdr *msg,
if (usedpages) {
/* RX SGL present */
struct af_alg_sgl *sgl_prev = &areq->last_rsgl->sgl;
struct scatterlist *sg = sgl_prev->sgt.sgl;
sg_unmark_end(sgl_prev->sg + sgl_prev->npages - 1);
sg_chain(sgl_prev->sg, sgl_prev->npages + 1,
areq->tsgl);
sg_unmark_end(sg + sgl_prev->sgt.nents - 1);
sg_chain(sg, sgl_prev->sgt.nents + 1, areq->tsgl);
} else
/* no RX SGL present (e.g. authentication only) */
rsgl_src = areq->tsgl;
@ -278,7 +280,7 @@ static int _aead_recvmsg(struct socket *sock, struct msghdr *msg,
/* Initialize the crypto operation */
aead_request_set_crypt(&areq->cra_u.aead_req, rsgl_src,
areq->first_rsgl.sgl.sg, used, ctx->iv);
areq->first_rsgl.sgl.sgt.sgl, used, ctx->iv);
aead_request_set_ad(&areq->cra_u.aead_req, ctx->aead_assoclen);
aead_request_set_tfm(&areq->cra_u.aead_req, tfm);

18
crypto/algif_hash.c
View File

@ -91,13 +91,21 @@ static int hash_sendmsg(struct socket *sock, struct msghdr *msg,
if (len > limit)
len = limit;
len = af_alg_make_sg(&ctx->sgl, &msg->msg_iter, len);
ctx->sgl.sgt.sgl = ctx->sgl.sgl;
ctx->sgl.sgt.nents = 0;
ctx->sgl.sgt.orig_nents = 0;
len = extract_iter_to_sg(&msg->msg_iter, len, &ctx->sgl.sgt,
ALG_MAX_PAGES, 0);
if (len < 0) {
err = copied ? 0 : len;
goto unlock;
}
sg_mark_end(ctx->sgl.sgt.sgl + ctx->sgl.sgt.nents);
ahash_request_set_crypt(&ctx->req, ctx->sgl.sg, NULL, len);
ctx->sgl.need_unpin = iov_iter_extract_will_pin(&msg->msg_iter);
ahash_request_set_crypt(&ctx->req, ctx->sgl.sgt.sgl, NULL, len);
err = crypto_wait_req(crypto_ahash_update(&ctx->req),
&ctx->wait);
@ -141,8 +149,8 @@ static ssize_t hash_sendpage(struct socket *sock, struct page *page,
flags |= MSG_MORE;
lock_sock(sk);
sg_init_table(ctx->sgl.sg, 1);
sg_set_page(ctx->sgl.sg, page, size, offset);
sg_init_table(ctx->sgl.sgl, 1);
sg_set_page(ctx->sgl.sgl, page, size, offset);
if (!(flags & MSG_MORE)) {
err = hash_alloc_result(sk, ctx);
@ -151,7 +159,7 @@ static ssize_t hash_sendpage(struct socket *sock, struct page *page,
} else if (!ctx->more)
hash_free_result(sk, ctx);
ahash_request_set_crypt(&ctx->req, ctx->sgl.sg, ctx->result, size);
ahash_request_set_crypt(&ctx->req, ctx->sgl.sgl, ctx->result, size);
if (!(flags & MSG_MORE)) {
if (ctx->more)

2
crypto/algif_skcipher.c
View File

@ -105,7 +105,7 @@ static int _skcipher_recvmsg(struct socket *sock, struct msghdr *msg,
/* Initialize the crypto operation */
skcipher_request_set_tfm(&areq->cra_u.skcipher_req, tfm);
skcipher_request_set_crypt(&areq->cra_u.skcipher_req, areq->tsgl,
areq->first_rsgl.sgl.sg, len, ctx->iv);
areq->first_rsgl.sgl.sgt.sgl, len, ctx->iv);
if (msg->msg_iocb && !is_sync_kiocb(msg->msg_iocb)) {
/* AIO operation */

6
include/crypto/if_alg.h
View File

@ -56,9 +56,8 @@ struct af_alg_type {
};
struct af_alg_sgl {
struct scatterlist sg[ALG_MAX_PAGES + 1];
struct page *pages[ALG_MAX_PAGES];
unsigned int npages;
struct sg_table sgt;
struct scatterlist sgl[ALG_MAX_PAGES + 1];
bool need_unpin;
};
@ -164,7 +163,6 @@ int af_alg_release(struct socket *sock);
void af_alg_release_parent(struct sock *sk);
int af_alg_accept(struct sock *sk, struct socket *newsock, bool kern);
int af_alg_make_sg(struct af_alg_sgl *sgl, struct iov_iter *iter, int len);
void af_alg_free_sg(struct af_alg_sgl *sgl);
static inline struct alg_sock *alg_sk(struct sock *sk)