Tom Tucker wrote:
Sean:
I was looking through ip_resolve_local and it looks to me like
if the source address is 0, it will end up getting set to the
destination IP instead of the IP address of the local interface.
The intent of ip_resolve_local() is to check if a given destination address is
on the local system. If it is and no source address is specified, then the
source address is set to the same address as the destination.
Also if ip_dev_find can't find a local interface with connectivity
to the specified remote peer, shouldn't the error be EHOSTUNREACH?
If the address is not a local address, then a check is made to find a route to
that address assuming that it exists somewhere remotely. See ib_resolve_addr()
which calls ip_resolve_local() and ip_resolve_remote(). So, the return code
from ip_resolve_local() returns that the given address is not available on the
local system. The address may still be reachable as a remote address.
Finally, if the user specifies a bogus source address, we don't
compare it against the source address configured on the local
interface found in the route. It will probably still fail later,
but in some bizarre fashion.
If the source address is bogus, then the call to ib_translate_addr() will fail
with EADDRNOTAVAIL.
I'm not tied to the return codes, so if one of them works better than the other,
I can change it.
- Sean
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