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after running ip/ipconfig -6, we are unable to ping our
own link-local address and the arp daemon sends out useless
neighbor solicitation requests to itself. this change
adds an arp entry for our ipv6 address. however, this
must not be done for tentative interface configuration.
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allocate the Iplifc structure on the stack instead.
i assuming that it was allocated on heap in fear of
causing stack oveflow. on 386, this adds arround
88 bytes on the stack but it doesnt seem to cause
any trouble. (checked with poolcheck after ctl write)
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ipifcunbind() could error out from ipifcremlifc() and Medium.unbind()
*after* decrementing ifc->conv->inuse! move the decrement after
calling these functions.
make ipifcremlifc() never raise error but return error string.
the only places where it could error is when it calls into
medium functions like Medium.remroute() and Medium.remmulti().
Ignore these errors as they could happen when the ethernet driver
crashed (think imported ethernet device or usb ethernet
in userspace), so we will be able to unbind.
add waserror() handlers as neccesary to deal with errors from
Medium.addmulti(), Medium.areg() and arpenter() to properly
unlock the data structures.
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Fsprotocone():
qopen() and qbypass() can fail and return nil, so make sure
the connection was not partially created by checking if read
and write queues have been setup by the protocol create hanler.
on error, free any resources of the partial connection and
error out.
netlogopen(): check malloc() error.
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