----- Original Message ----- From: "Bjoern A. Zeeb" <b...@freebsd.org>
To: "Steven Hartland" <kill...@multiplay.co.uk> Cc: <freebsd-net@freebsd.org> Sent: Saturday, June 25, 2011 10:27 AM Subject: Re: IPv4 socket bind using IPv6 socket on openjdk6 breaks udp send
On Jun 24, 2011, at 9:11 PM, Steven Hartland wrote: Hi,
We're trying to get our machines IPv6 enabled but in doing so this seems to break java apps using openjdk6 for UDP sends. One of the clues I can give you is: http://diario.behrens.de/2008/10/12/java_and_ipv6_on_bsd.html it's old(er) and I have lately been tolded that openjdk has a problem.
Yer read that but it seems like the jdk7 patch is already in which should fix it:- http://www.freebsd.org/cgi/cvsweb.cgi/ports/java/openjdk6/files/patch-set
using truss we see the following:-
socket(PF_INET6,SOCK_DGRAM,0) = 20 (0x14)
setsockopt(0x14,0x29,0x1b,0x7ffffedf0318,0x4,0x0) = 0 (0x0)
setsockopt(0x14,0xffff,0x20,0x7ffffedf031c,0x4,0x0) = 0 (0x0)
bind(20,{ AF_INET6 [3800::10:0:0:0]:20736 },28) = 0 (0x0)
..
recvfrom(20,0x7ffffeaeb580,1460,0x0,0x7ffffeaed580,0x7ffffeaed5ac) ERR#60
'Operation timed out'
..
sendto(20,"\M^?\M^?\M^?\M^?I\aMultiplay :: "...,82,0x0,{ AF_INET6
[3800::10:0:0:0]:20736 },0x1c) ERR#22 'Invalid argument'
So how much is really between these ...? If you want, can you send
me a full output in private email?
Just a load of gettimeofday, clock_gettime, _umtx_op and mprotect calls nothing of interest.
Also which version of FreeBSD is this?
8.2-RELEASE
sockstat shows it binding correctly root java 894 21 tcp4 85.236.109.212:25675 *:* That's unfortunately unreleated.
Yer cut and paste error (wrong line) heres the correct line. root java 894 20 udp4 85.236.109.212:25675 *:* 21 is the tcp port created in the same manor (ipv6 socket) which works fine.
The following PR seems relevant but also seems to indicate it was fixed back in 2006 http://www.freebsd.org/cgi/query-pr.cgi?pr=92620
This doesn't seen to be related to the above as 3800::10:0:0:0 is not a v4-mapped-v6 address. Now there could be the problem really. Do you know which address the code above was trying to talk with?
I'm wondering if thats a decode error by truss, as it doesn't seem to corrispond to anything on the machine and is the same no matter what ip the socket is bound to. ifconfig output in my last reply if that helps.
Also do you have a very simple test program I could try to run if I compile openjdk6?
The attached java file demonstrates the behviour.
java Main <ipv4 address>
Then just send any udp packet to <ipv4 address>:25675 it should
respond with pong but on a dual stack machine it just throws as
exception:-
WARNING: IO: Invalid argument
java.io.IOException: Invalid argument
at java.net.PlainDatagramSocketImpl.send(Native Method)
at java.net.DatagramSocket.send(DatagramSocket.java:629)
at Main.main(Main.java:34)
Regards
Steve
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Main.java
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