8207404: MulticastSocket tests failing on Aix

[Volker Simonis]

On Mon, Jan 14, 2019 at 2:19 PM Steve Groeger <GROEGES at uk.ibm.com> wrote:
>
> Hi Chris / Volker,
>
> I had already tried doing the same as is done for Linux, ie calling this first
>
> mcast_set_if_by_if_v4(env, this, fd, value);
>
> This still fails for some reason with EADDRNOTAVAIL.

Finding this out is probably the main challenge in order to solve this
issue and one of the reason why we asked IBM for assistance :)

I suppose there must be a possibility to set a socket option for an
IPv4 socket on AIX even if IPv6 is enabled. Otherwise this is probably
an AIX problem/bug which should be fixed there (where, again, we need
assistance from IBM).

The man-page (https://www.ibm.com/support/knowledgecenter/ssw_ibm_i_71/apis/ssocko.htm)
mentions the following:

IP_MULTICAST_IF: et interface over which outgoing multicast datagrams
should be sent. This option is only supported for sockets with an
address family of AF_INET and type of SOCK_DGRAM or SOCK_RAW.

Maybe the interface is erroneously in the AF_INET6 family? The
man-page only mentions the following for EADDRNOTAVAIL:

EADDRNOTAVAIL: Address not available. For the IP_ADD_MEMBERSHIP or
IP_DROP_MEMBERSHIP operations, this error code indicates that an
incorrect address was specified for either the imr_multiaddr or
imr_interface parameter value.

> This error gets cleared by the
>
> if ((*env)->ExceptionCheck(env)){
>    (*env)->ExceptionClear(env);
> }
>
> as ipv6_available() still returns true, but we then still try and call
>
> mcast_set_if_by_if_v6(env, this, fd, value);
>
> which again fails with EADDRNOTAVAIL. So we have the same result.
>
> Thanks
> Steve Groeger
> IBM Runtime Technologies
> Hursley, Winchester
> Tel: (44) 1962 816911  Mobex: 279990  Mobile: 07718 517 129
> Fax (44) 1962 816800
> Lotus Notes: Steve Groeger/UK/IBM
> Internet: groeges at uk.ibm.com
>
> Unless stated otherwise above:
> IBM United Kingdom Limited - Registered in England and Wales with number 741598.
> Registered office: PO Box 41, North Harbour, Portsmouth, Hampshire PO6 3AU
>
>
>
> From:        Chris Hegarty <chris.hegarty at oracle.com>
> To:        Volker Simonis <volker.simonis at gmail.com>
> Cc:        Steve Groeger <GROEGES at uk.ibm.com>, ppc-aix-port-dev at openjdk.java.net, net-dev <net-dev at openjdk.java.net>
> Date:        12/01/2019 14:21
> Subject:        Re: 8207404: MulticastSocket tests failing on Aix
> ________________________________
>
>
>
>
>
> > On 11 Jan 2019, at 17:28, Volker Simonis <volker.simonis at gmail.com> wrote:
> >
> > I think the difference is in setMulticastInterface() in
> > PlainDatagramSocketImpl.c
> >
> > #ifdef __linux__
> >        mcast_set_if_by_if_v4(env, this, fd, value);
> >        if (ipv6_available()) {
> >            if ((*env)->ExceptionCheck(env)){
> >                (*env)->ExceptionClear(env);
> >            }
> >            mcast_set_if_by_if_v6(env, this, fd, value);
> >        }
> > #else  /* __linux__ not defined */
> >        if (ipv6_available()) {
> >            mcast_set_if_by_if_v6(env, this, fd, value);
> >        } else {
> >            mcast_set_if_by_if_v4(env, this, fd, value);
> >        }
> > #endif  /* __linux__ */
> >
> > We should probably follow the Linux way for AIX as well.
>
> I agree.
>
> -Chris.
>
> >> On Fri, Jan 11, 2019 at 5:29 PM Chris Hegarty <chris.hegarty at oracle.com> wrote:
> >>
> >>
> >>> On 09/01/2019 15:20, Steve Groeger wrote:
> >>> ...
> >>>
> >>> I think I have an Linux system setup with a simarly configured interface
> >>> (system has IPv6 configured but interface
> >>> has no IPv6/INET6 address configured) but the test works fine when run
> >>> on that system.
> >>
> >> This is what I observe too. Confirmed by looking at the test
> >> output in the jtr file.
> >>
> >>> This was why I was asking the question on whether this should work on
> >>> AIX, or whether it should fail on Linux!!!
> >>
> >> I suspect that this is an issue with the native setsockopt
> >> on AIX. That said, if it cannot be resolved on AIX, then
> >> maybe the networking native code on AIX, should workaround
> >> it.
> >>
> >> -Chris.
>
>
>
>
> Unless stated otherwise above:
> IBM United Kingdom Limited - Registered in England and Wales with number 741598.
> Registered office: PO Box 41, North Harbour, Portsmouth, Hampshire PO6 3AU