Re: [ewg] rping is not resolving ipv6 addresses

[Jason Gunthorpe <jgunthorpe-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>]

On Fri, Oct 09, 2009 at 02:15:01PM -0700, David J. Wilder wrote:

> Yes ping6 will work but I must specify the interface to use:
> ping6 fe80::202:c903:1:1925%ib0
> 
> Here is the patch to rping to allow the source address to be specified.
> I am not sure this is the correct approach to fix this.

It is not, IPv6 link local addresses must be scoped. rping is
parsing the address with getaddrinfo, that does correctly set the
sin6_scope_id value in the sockaddr.

rdma_resolve_addr (and likely the underlying kernel component) must
respect this when dealing with link local scope addresses.

rmda_resolve_addr should fail if a link local IPv6 address is provided
without scope, like the normal IP stack:

connect(3, {sa_family=AF_INET6, sin6_port=htons(1025), inet_pton(AF_INET6, "fe80::202:c903:1:1925", &sin6_addr), sin6_flowinfo=0, sin6_scope_id=0}, 28) = -1 EINVAL (Invalid argument)

So this is two bugs in the rdma cm, rping is correct as is..

Jason
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