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From: David Howells <dhowells@redhat.com>
To: Willem de Bruijn <willemdebruijn.kernel@gmail.com>
Cc: dhowells@redhat.com, Willem de Bruijn <willemb@google.com>,
	Network Development <netdev@vger.kernel.org>
Subject: Re: Getting at the UDP headers from ->data_ready()
Date: Mon, 11 Apr 2016 22:23:33 +0100	[thread overview]
Message-ID: <1831.1460409813@warthog.procyon.org.uk> (raw)
In-Reply-To: <CAF=yD-JfW6kfoQ4geO3bCCrBVng-AL=BqBuVyF2nU0tO4jpsDg@mail.gmail.com>

Willem de Bruijn <willemdebruijn.kernel@gmail.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

      reply	other threads:[~2016-04-11 21:23 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-04-11 21:04 Getting at the UDP headers from ->data_ready() David Howells
2016-04-11 21:18 ` Willem de Bruijn
2016-04-11 21:23   ` David Howells [this message]

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