Merging upstream version 6.7.7.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 74 insertions, 1 deletions

diff --git a/net/core/datagram.c b/net/core/datagram.c
index 176eb58347..a8b625abe2 100644
--- a/net/core/datagram.c
+++ b/net/core/datagram.c
@@ -50,7 +50,7 @@
 #include <linux/spinlock.h>
 #include <linux/slab.h>
 #include <linux/pagemap.h>
-#include <linux/uio.h>
+#include <linux/iov_iter.h>
 #include <linux/indirect_call_wrapper.h>
 
 #include <net/protocol.h>
@@ -61,6 +61,7 @@
 #include <net/tcp_states.h>
 #include <trace/events/skb.h>
 #include <net/busy_poll.h>
+#include <crypto/hash.h>
 
 /*
  *	Is a socket 'connection oriented' ?
@@ -489,6 +490,24 @@ short_copy:
 	return 0;
 }
 
+static size_t hash_and_copy_to_iter(const void *addr, size_t bytes, void *hashp,
+				    struct iov_iter *i)
+{
+#ifdef CONFIG_CRYPTO_HASH
+	struct ahash_request *hash = hashp;
+	struct scatterlist sg;
+	size_t copied;
+
+	copied = copy_to_iter(addr, bytes, i);
+	sg_init_one(&sg, addr, copied);
+	ahash_request_set_crypt(hash, &sg, NULL, copied);
+	crypto_ahash_update(hash);
+	return copied;
+#else
+	return 0;
+#endif
+}
+
 /**
  *	skb_copy_and_hash_datagram_iter - Copy datagram to an iovec iterator
  *          and update a hash.
@@ -716,6 +735,60 @@ int zerocopy_sg_from_iter(struct sk_buff *skb, struct iov_iter *from)
 }
 EXPORT_SYMBOL(zerocopy_sg_from_iter);
 
+static __always_inline
+size_t copy_to_user_iter_csum(void __user *iter_to, size_t progress,
+			      size_t len, void *from, void *priv2)
+{
+	__wsum next, *csum = priv2;
+
+	next = csum_and_copy_to_user(from + progress, iter_to, len);
+	*csum = csum_block_add(*csum, next, progress);
+	return next ? 0 : len;
+}
+
+static __always_inline
+size_t memcpy_to_iter_csum(void *iter_to, size_t progress,
+			   size_t len, void *from, void *priv2)
+{
+	__wsum *csum = priv2;
+	__wsum next = csum_partial_copy_nocheck(from + progress, iter_to, len);
+
+	*csum = csum_block_add(*csum, next, progress);
+	return 0;
+}
+
+struct csum_state {
+	__wsum csum;
+	size_t off;
+};
+
+static size_t csum_and_copy_to_iter(const void *addr, size_t bytes, void *_csstate,
+				    struct iov_iter *i)
+{
+	struct csum_state *csstate = _csstate;
+	__wsum sum;
+
+	if (WARN_ON_ONCE(i->data_source))
+		return 0;
+	if (unlikely(iov_iter_is_discard(i))) {
+		// can't use csum_memcpy() for that one - data is not copied
+		csstate->csum = csum_block_add(csstate->csum,
+					       csum_partial(addr, bytes, 0),
+					       csstate->off);
+		csstate->off += bytes;
+		return bytes;
+	}
+
+	sum = csum_shift(csstate->csum, csstate->off);
+
+	bytes = iterate_and_advance2(i, bytes, (void *)addr, &sum,
+				     copy_to_user_iter_csum,
+				     memcpy_to_iter_csum);
+	csstate->csum = csum_shift(sum, csstate->off);
+	csstate->off += bytes;
+	return bytes;
+}
+
 /**
  *	skb_copy_and_csum_datagram - Copy datagram to an iovec iterator
  *          and update a checksum.