net/core/datagram.c

19  *		Alan Cox	:	Rewrote skb_read_datagram to avoid the
85  * Wait for the last received packet to be different from skb
144 	/* We have to unshare an skb before modifying it. */
209  *	@queue: socket queue from which to receive
211  *	@off: an offset in bytes to peek skb from. Returns an offset
214  *	@last: set to last peeked message to inform the wait function
215  *	       what to look for when peeking
224  *	the caller needs to unlock the socket in that case (usually by
225  *	calling skb_free_datagram). Returns NULL with @err set to
226  *	-EAGAIN if no data was available or to some other value if an
232  *	* when data copying to user space takes lots of time.
249 	 * Caller is allowed not to check sk->sk_err before skb_recv_datagram()
389 			       struct iov_iter *to, int len, bool fault_short,
402 				    skb->data + offset, copy, data, to);
426 					copy, data, to);
447 						to, copy, fault_short, cb, data))
464 	iov_iter_revert(to, offset - start_off);
468 	if (fault_short || iov_iter_count(to))
493  *	skb_copy_and_hash_datagram_iter - Copy datagram to an iovec iterator
495  *	@skb: buffer to copy
496  *	@offset: offset in the buffer to start copying from
497  *	@to: iovec iterator to copy to
498  *	@len: amount of data to copy from buffer to iovec
499  *      @hash: hash request to update
502 			   struct iov_iter *to, int len,
505 	return __skb_datagram_iter(skb, offset, to, len, true,
517  *	skb_copy_datagram_iter - Copy a datagram to an iovec iterator.
518  *	@skb: buffer to copy
519  *	@offset: offset in the buffer to start copying from
520  *	@to: iovec iterator to copy to
521  *	@len: amount of data to copy from buffer to iovec
524 			   struct iov_iter *to, int len)
527 	return __skb_datagram_iter(skb, offset, to, len, false,
534  *	@skb: buffer to copy
535  *	@offset: offset in the buffer to start copying to
537  *	@len: amount of data to copy to buffer from iovec
674 					/* We combined this page, we need to release
677 					 * adjustments to limit false sharing.
699  *	@skb: buffer to copy
700  *	@from: the source to copy from
702  *	The function will first copy up to headlen, and then pin the userspace
711 	/* copy up to skb headlen */
774  *	skb_copy_and_csum_datagram - Copy datagram to an iovec iterator
776  *	@skb: buffer to copy
777  *	@offset: offset in the buffer to start copying from
778  *	@to: iovec iterator to copy to
779  *	@len: amount of data to copy from buffer to iovec
783 				      struct iov_iter *to, int len,
789 	ret = __skb_datagram_iter(skb, offset, to, len, true,
799  *	skb_copy_and_csum_datagram_msg - Copy and checksum skb to user iovec.
804  *	Caller _must_ check that skb will fit to this iovec.
853  *	is only ever holding data ready to receive.
885 	/* Connection-based need to check for termination and startup */