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The sockaddr structure for AF_IB is larger than sockaddr_in6. The rdma cm user space ABI uses the latter to exchange address information between user space and the kernel. To support querying for larger addresses, define a new query command that exchanges data using sockaddr_storage, rather than sockaddr_in6. Unlike the existing query_route command, the new command only returns address information. Route (i.e. path record) data is separated. Signed-off-by: Sean Hefty <sean.hefty@intel.com> Signed-off-by: Roland Dreier <roland@purestorage.com>