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authorDavid Howells <dhowells@redhat.com>2023-06-06 16:08:54 +0300
committerPaolo Abeni <pabeni@redhat.com>2023-06-08 14:42:34 +0300
commitbf63e250c4b1f21696599e0ab7117f4429dcbdc0 (patch)
tree18a5adec6b66cff5e5de28655f4f9a1e6d3e68ab /crypto
parent73d7409cfdad7fd08a9203eb2912c1c77e527776 (diff)
downloadlinux-bf63e250c4b1f21696599e0ab7117f4429dcbdc0.tar.xz
crypto: af_alg: Support MSG_SPLICE_PAGES
Make AF_ALG sendmsg() support MSG_SPLICE_PAGES. This causes pages to be spliced from the source iterator. This allows ->sendpage() to be replaced by something that can handle multiple multipage folios in a single transaction. 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>
Diffstat (limited to 'crypto')
-rw-r--r--crypto/af_alg.c24
-rw-r--r--crypto/algif_aead.c22
-rw-r--r--crypto/algif_skcipher.c8
3 files changed, 37 insertions, 17 deletions
diff --git a/crypto/af_alg.c b/crypto/af_alg.c
index fd56ccff6fed..9c12530d604a 100644
--- a/crypto/af_alg.c
+++ b/crypto/af_alg.c
@@ -985,7 +985,7 @@ int af_alg_sendmsg(struct socket *sock, struct msghdr *msg, size_t size,
while (size) {
struct scatterlist *sg;
size_t len = size;
- size_t plen;
+ ssize_t plen;
/* use the existing memory in an allocated page */
if (ctx->merge) {
@@ -1030,7 +1030,27 @@ int af_alg_sendmsg(struct socket *sock, struct msghdr *msg, size_t size,
if (sgl->cur)
sg_unmark_end(sg + sgl->cur - 1);
- if (1 /* TODO check MSG_SPLICE_PAGES */) {
+ if (msg->msg_flags & MSG_SPLICE_PAGES) {
+ struct sg_table sgtable = {
+ .sgl = sg,
+ .nents = sgl->cur,
+ .orig_nents = sgl->cur,
+ };
+
+ plen = extract_iter_to_sg(&msg->msg_iter, len, &sgtable,
+ MAX_SGL_ENTS, 0);
+ if (plen < 0) {
+ err = plen;
+ goto unlock;
+ }
+
+ for (; sgl->cur < sgtable.nents; sgl->cur++)
+ get_page(sg_page(&sg[sgl->cur]));
+ len -= plen;
+ ctx->used += plen;
+ copied += plen;
+ size -= plen;
+ } else {
do {
struct page *pg;
unsigned int i = sgl->cur;
diff --git a/crypto/algif_aead.c b/crypto/algif_aead.c
index 829878025dba..35bfa283748d 100644
--- a/crypto/algif_aead.c
+++ b/crypto/algif_aead.c
@@ -9,8 +9,8 @@
* The following concept of the memory management is used:
*
* The kernel maintains two SGLs, the TX SGL and the RX SGL. The TX SGL is
- * filled by user space with the data submitted via sendpage/sendmsg. Filling
- * up the TX SGL does not cause a crypto operation -- the data will only be
+ * filled by user space with the data submitted via sendpage. Filling up
+ * the TX SGL does not cause a crypto operation -- the data will only be
* tracked by the kernel. Upon receipt of one recvmsg call, the caller must
* provide a buffer which is tracked with the RX SGL.
*
@@ -113,19 +113,19 @@ static int _aead_recvmsg(struct socket *sock, struct msghdr *msg,
}
/*
- * Data length provided by caller via sendmsg/sendpage that has not
- * yet been processed.
+ * Data length provided by caller via sendmsg that has not yet been
+ * processed.
*/
used = ctx->used;
/*
- * Make sure sufficient data is present -- note, the same check is
- * also present in sendmsg/sendpage. The checks in sendpage/sendmsg
- * shall provide an information to the data sender that something is
- * wrong, but they are irrelevant to maintain the kernel integrity.
- * We need this check here too in case user space decides to not honor
- * the error message in sendmsg/sendpage and still call recvmsg. This
- * check here protects the kernel integrity.
+ * Make sure sufficient data is present -- note, the same check is also
+ * present in sendmsg. The checks in sendmsg shall provide an
+ * information to the data sender that something is wrong, but they are
+ * irrelevant to maintain the kernel integrity. We need this check
+ * here too in case user space decides to not honor the error message
+ * in sendmsg and still call recvmsg. This check here protects the
+ * kernel integrity.
*/
if (!aead_sufficient_data(sk))
return -EINVAL;
diff --git a/crypto/algif_skcipher.c b/crypto/algif_skcipher.c
index a251cd6bd5b9..b1f321b9f846 100644
--- a/crypto/algif_skcipher.c
+++ b/crypto/algif_skcipher.c
@@ -9,10 +9,10 @@
* The following concept of the memory management is used:
*
* The kernel maintains two SGLs, the TX SGL and the RX SGL. The TX SGL is
- * filled by user space with the data submitted via sendpage/sendmsg. Filling
- * up the TX SGL does not cause a crypto operation -- the data will only be
- * tracked by the kernel. Upon receipt of one recvmsg call, the caller must
- * provide a buffer which is tracked with the RX SGL.
+ * filled by user space with the data submitted via sendmsg. Filling up the TX
+ * SGL does not cause a crypto operation -- the data will only be tracked by
+ * the kernel. Upon receipt of one recvmsg call, the caller must provide a
+ * buffer which is tracked with the RX SGL.
*
* During the processing of the recvmsg operation, the cipher request is
* allocated and prepared. As part of the recvmsg operation, the processed