netdev - Re: all is not right with the world...

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Message-Id: <20071209.222018.238869829.davem@davemloft.net>
Date:	Sun, 09 Dec 2007 22:20:18 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	dlstevens@...ibm.com
Cc:	yoshfuji@...ux-ipv6.org, netdev@...r.kernel.org
Subject: Re: all is not right with the world...

From: David Stevens <dlstevens@...ibm.com>
Date: Sun, 9 Dec 2007 16:19:12 -0800

>         I don't know if you've fixed it already, but I was writing some
> UDPv6 tests in 2.6.23.9 and was getting EDESTADDRREQ unexpectedly. When
> I looked at the kernel code, I found:
> 
> gerrit/wscott     1.115       | int udpv6_sendmsg(struct kiocb *iocb, 
> struct sock *sk,
> shemminger        1.57        |                                    struct 
> msghdr *msg, size_t len)
> torvalds          1.1         | {
> ...
> 
> yoshfuji          1.53        |                  } else if (!up->pending) 
> {
> yoshfuji          1.53        |                                  if 
> (sk->sk_state != TCP_ESTABLISHED)
> yoshfuji          1.53        |  return -EDESTADDRREQ;
> yoshfuji          1.53        |                                  daddr = 
> &np->daddr;
> 
>         I wouldn't expect a UDP socket to be setting
> sk_state to TCP_ESTABLISHED...

It does when you connect() it.

UDP reuses the TCP state values out of convenience.
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