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    SubjectRe: [RFC PATCH] network: return errors if we know tcp_connect failed
    From: Alexey Kuznetsov <>
    Date: Fri, 12 Nov 2010 20:46:20 +0300

    > The only loophole is ICMP error in the same case as yours. In
    > _violation_ of specs linux immediately aborts unestablished connect
    > on an icmp error. IMHO that thing which you suggest is correct (of
    > course, provided you filter out transient errors and react only to
    > EPERM or something like this). It was not done because it was
    > expected firewall rule prescribing immediate abort is configured
    > with "--reject-with icmp-port-unreachable", otherwise the rule
    > orders real blackhole.

    The idea to signal on -EPERM might be OK, but if that's also
    what things like "-m statistical" and friends end up reporting
    then we still cannot do it.

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