On Mon, May 15, 2006 at 11:57:12PM -0700, David S. Miller (davem@davemloft.net) wrote:

From: Evgeniy Polyakov <redacted>
Date: Tue, 16 May 2006 10:19:09 +0400

quoted

+static int netchannel_convert_skb_ipv4(struct sk_buff *skb, struct unetchannel *unc)
+{

 ...

quoted

+	switch (unc->proto) {
+		case IPPROTO_TCP:

 ...

quoted

+		case IPPROTO_UDP:

 ...

Why do people write code like this?

Port location is protocol agnostic, there are always 2
16-bit ports at beginning of header without exception.

Without this, ICMP would be useless :-)

And what if we use ESP which would place it's hashed sequence number as
port?

-- 
	Evgeniy Polyakov