Re: getaddrinfo - should accept IPPROTO_SCTP no?

Re: getaddrinfo - should accept IPPROTO_SCTP no?

[Ian McDonald]

On 10/14/06, Rick Jones <rick.jones2@hp.com> wrote:
> I made some recent changes to netperf to workaround what is IMO a bug in the
> Solaris getaddrinfo() where it will clear the ai_protocol field even when one
> gives it a protocol in the hints.
>
> [If you happen to be trying to use the test-specific -D to set TCP_NODELAY in
> netperf on Solaris, you might want to grab netperf TOT to get this workaround as
> it relates to issues with setting TCP_NODELAY - modulo what it will do to being
> able to run the netperf SCTP tests on Linux...]
>
> In the process though I have stumbled across what appears to be a bug (?) in
> "Linux" getaddrinfo() - returning a -7 EAI_SOCKTYPE if given as hints
> SOCK_STREAM and IPPROTO_SCTP - this on a system that ostensibly supports SCTP.
> I've seen this on RHAS4U4 as well as another less well known distro.
>
> I'm about to see about concocting an additional workaround in netperf for this,
> but thought I'd ask if my assumption - that getaddrinfo() returning -7 when
> given IPPROTO_SCTP - is indeed a bug in getaddrinfo().  Or am I just woefully
> behind in patches or completely offbase on what is correct behaviour for
> getaddrinfo and hints?
>
> FWIW, which may not be much, Solaris 10 06/06 seems content to accept
> IPPROTO_SCTP in the hints.
>
> thanks,
>
> rick jones
> http://www.netperf.org/svn/netperf2/trunk/

In all the DCCP code which has similar issues I just do the protocol
selection on the socket call e.g.
		case TCP:
			new_sock = socket(AF_INET,SOCK_STREAM,0);
			break;
		case DCCP:
			new_sock = socket(AF_INET,SOCK_DCCP,IPPROTO_DCCP);
			break;
		case UDP:
			new_sock = socket(AF_INET,SOCK_DGRAM,0);
			break;

I'm sure you know all this anyway so apologies in advance for telling
you something you probably already know!

We need to come up with a way to select service codes etc for DCCP
which is another parameter needed for a DCCP socket when getaddrinfo
is tidied up.

Ian
-- 
Ian McDonald
Web: http://wand.net.nz/~iam4
Blog: http://imcdnzl.blogspot.com
WAND Network Research Group
Department of Computer Science
University of Waikato
New Zealand

Re: getaddrinfo - should accept IPPROTO_SCTP no?

[Rick Jones]

> In all the DCCP code which has similar issues I just do the protocol
> selection on the socket call e.g.
>         case TCP:
>             new_sock = socket(AF_INET,SOCK_STREAM,0);
>             break;
>         case DCCP:
>             new_sock = socket(AF_INET,SOCK_DCCP,IPPROTO_DCCP);
>             break;
>         case UDP:
>             new_sock = socket(AF_INET,SOCK_DGRAM,0);
>             break;
> 
> I'm sure you know all this anyway so apologies in advance for telling
> you something you probably already know!

No worries.

David mentioned that I need to talk to the glibc folks.  I'm still trying to web 
search my way to finding them.  Meanwhile I may do in netperf for this what I do 
for Solaris' arbitrary clearing of the ai_protocol field - kludge around it and 
have netperf emit a warning.

rick jones