netdev - Re: Getting at the UDP headers from ->data

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Date:	Mon, 11 Apr 2016 22:23:33 +0100
From:	David Howells <dhowells@...hat.com>
To:	Willem de Bruijn <willemdebruijn.kernel@...il.com>
Cc:	dhowells@...hat.com, Willem de Bruijn <willemb@...gle.com>,
	Network Development <netdev@...r.kernel.org>
Subject: Re: Getting at the UDP headers from ->data_ready()

Willem de Bruijn <willemdebruijn.kernel@...il.com> wrote:

> The network and transport header pointers are still valid. Commit e6afc8ace6dd
> only  changes where skb->data points to. It does not discard the data between
> skb->head and skb->data. This rxrpc follow-up patch fixes some offset
> arithmetic to the payload, which is computed relative to skb->data.
> 
> There are other uses of ip_hdr and udp_hdr in udp_recvmsg and similar
> recvmsg handlers for other protocols. For instance, in the source address
> processing for recvfrom ("if (sin) { .. }")

Excellent, thanks!

David