tree a9efa9e4f871a459d1b8bc3cebab133cb1a378f3
parent ce3b7e1906ebbe96753fe090b36de6ffb8e0e0e7
author Chuck Lever <chuck.lever@oracle.com> 1214239021 -0400
committer Trond Myklebust <Trond.Myklebust@netapp.com> 1215619769 -0400

NFS: handle interface identifiers in incoming IPv6 addresses

Add support in the kernel NFS client's address parser for interface
identifiers.

IPv6 link-local addresses require an additional "interface identifier",
which is a network device name or an integer that indexes the array of
local network interfaces.  They are suffixed to the address with a '%'.
For example:

	fe80::215:c5ff:fe3b:e1b2%2

indicates an interface index of 2.  Or

	fe80::215:c5ff:fe3b:e1b2%eth0

indicates that requests should be routed through the eth0 device.
Without the interface ID, link-local addresses are not usable for NFS.

Both the kernel NFS client mount option parser and the mount.nfs command
can take either form.  The mount.nfs command always passes the address
through getnameinfo(3), which usually re-writes interface indices as
device names.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>