diff options
| -rw-r--r-- | include/linux/skbuff.h | 2 | ||||
| -rw-r--r-- | net/core/datagram.c | 33 |
2 files changed, 35 insertions, 0 deletions
diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h index 018c07230513..510adf63c211 100644 --- a/include/linux/skbuff.h +++ b/include/linux/skbuff.h @@ -4137,6 +4137,8 @@ int skb_copy_and_csum_datagram_msg(struct sk_buff *skb, int hlen, int skb_copy_and_hash_datagram_iter(const struct sk_buff *skb, int offset, struct iov_iter *to, int len, struct ahash_request *hash); +int skb_copy_and_crc32c_datagram_iter(const struct sk_buff *skb, int offset, + struct iov_iter *to, int len, u32 *crcp); int skb_copy_datagram_from_iter(struct sk_buff *skb, int offset, struct iov_iter *from, int len); int zerocopy_sg_from_iter(struct sk_buff *skb, struct iov_iter *frm); diff --git a/net/core/datagram.c b/net/core/datagram.c index 9ef5442536f5..fa87abb66632 100644 --- a/net/core/datagram.c +++ b/net/core/datagram.c @@ -52,6 +52,7 @@ #include <linux/pagemap.h> #include <linux/iov_iter.h> #include <linux/indirect_call_wrapper.h> +#include <linux/crc32.h> #include <net/protocol.h> #include <linux/skbuff.h> @@ -519,6 +520,38 @@ int skb_copy_and_hash_datagram_iter(const struct sk_buff *skb, int offset, } EXPORT_SYMBOL(skb_copy_and_hash_datagram_iter); +#ifdef CONFIG_NET_CRC32C +static size_t crc32c_and_copy_to_iter(const void *addr, size_t bytes, + void *_crcp, struct iov_iter *i) +{ + u32 *crcp = _crcp; + size_t copied; + + copied = copy_to_iter(addr, bytes, i); + *crcp = crc32c(*crcp, addr, copied); + return copied; +} + +/** + * skb_copy_and_crc32c_datagram_iter - Copy datagram to an iovec iterator + * and update a CRC32C value. + * @skb: buffer to copy + * @offset: offset in the buffer to start copying from + * @to: iovec iterator to copy to + * @len: amount of data to copy from buffer to iovec + * @crcp: pointer to CRC32C value to update + * + * Return: 0 on success, -EFAULT if there was a fault during copy. + */ +int skb_copy_and_crc32c_datagram_iter(const struct sk_buff *skb, int offset, + struct iov_iter *to, int len, u32 *crcp) +{ + return __skb_datagram_iter(skb, offset, to, len, true, + crc32c_and_copy_to_iter, crcp); +} +EXPORT_SYMBOL(skb_copy_and_crc32c_datagram_iter); +#endif /* CONFIG_NET_CRC32C */ + static size_t simple_copy_to_iter(const void *addr, size_t bytes, void *data __always_unused, struct iov_iter *i) { |