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Forget about:
https://fedoraproject.org/wiki/SELinux_Policy_Modules_Packaging_Draft
and:
https://fedoraproject.org/wiki/PackagingDrafts/SELinux_Independent_Policy
The guidelines to follow are:
https://fedoraproject.org/wiki/SELinux/IndependentPolicy
Start from fixing the most pressing issue, that is, a path conflict
with policy-selinux-devel about passt.if, and, while at it, adjust
the installation paths for policy files too.
Reported-by: Xose Vazquez Perez <xose.vazquez@gmail.com>
Link: https://bugzilla.redhat.com/show_bug.cgi?id=2182476
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
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That was meant to be an example, and I just dropped it in the
previous commit -- passt.if should be more than enough as a possible
example.
Reported-by: Carl G. <carlg@fedoraproject.org>
Link: https://bugzilla.redhat.com/show_bug.cgi?id=2182145
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
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This was meant to be an example, but I managed to add syntax errors
to it. Drop it altogether.
Reported-by: Carl G. <carlg@fedoraproject.org>
Link: https://bugzilla.redhat.com/show_bug.cgi?id=2182145
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
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Somebody might want to bind listening sockets to a specific
interface, but not a specific address, and there isn't really a
reason to prevent that. For example:
-t %eth0/2022
Alternatively, we support options such as -t 0.0.0.0%eth0/2022 and
-t ::%eth0/2022, but not together, for the same port.
Enable this kind of syntax and add examples to the man page.
Reported-by: Paul Holzinger <pholzing@redhat.com>
Link: https://github.com/containers/podman/issues/14425#issuecomment-1485192195
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
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Since commit cc6d8286d104 ("tcp: Reset ACK_FROM_TAP_DUE flag only as
needed, update timer"), we don't clear ACK_FROM_TAP_DUE whenever we
process an ACK segment, but, more correctly, only if we're really not
waiting for a further ACK segment, that is, only if the acknowledged
sequence matches what we sent.
In the new function implementing this, tcp_update_seqack_from_tap(),
we also reset the retransmission counter and store the updated ACK
sequence. Both should be done iff forward progress is acknowledged,
implied by the fact that the new ACK sequence is greater than the
one we previously stored.
At that point, it looked natural to also include the statements that
clear and set the ACK_FROM_TAP_DUE flag inside the same conditional
block: if we're not making forward progress, the need for an ACK, or
lack thereof, should remain unchanged.
There might be cases where this isn't true, though: without the
previous commit 4e73e9bd655c ("tcp: Don't special case the handling
of the ack of a syn"), this would happen if a tap-side client
initiated a connection, and the server didn't send any data.
At that point we would never, in the established state of the
connection, call tcp_update_seqack_from_tap() with reported forward
progress.
That issue itself is fixed by the previous commit, now, but clearing
ACK_FROM_TAP_DUE only on ACK sequence progress doesn't really follow
any logic.
Clear the ACK_FROM_TAP_DUE flag regardless of reported forward
progress. If we clear it when it's already unset, conn_flag() will do
nothing with it.
This doesn't fix any known functional issue, rather a conceptual one.
Fixes: cc6d8286d104 ("tcp: Reset ACK_FROM_TAP_DUE flag only as needed, update timer")
Reported-by: David Gibson <david@gibson.dropbear.id.au>
Analysed-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
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TCP treats the SYN packets as though they occupied 1 byte in the logical
data stream described by the sequence numbers. That is, the very first ACK
(or SYN-ACK) each side sends should acknowledge a sequence number one
greater than the initial sequence number given in the SYN or SYN-ACK it's
responding to.
In passt we were tracking that by advancing conn->seq_to_tap by one when
we send a SYN or SYN-ACK (in tcp_send_flag()). However, we also
initialized conn->seq_ack_from_tap, representing the acks we've already
seen from the tap side, to ISN+1, meaning we treated it has having
acknowledged the SYN before it actually did.
There were apparently reasons for this in earlier versions, but it causes
problems now. Because of this when we actually did receive the initial ACK
or SYN-ACK, we wouldn't see the acknoweldged serial number as advancing,
and so wouldn't clear the ACK_FROM_TAP_DUE flag.
In most cases we'd get away because subsequent packets would clear the
flag. However if one (or both) sides didn't send any data, the other side
would (correctly) keep sending ISN+1 as the acknowledged sequence number,
meaning we would never clear the ACK_FROM_TAP_DUE flag. That would mean
we'd treat the connection as if we needed to retransmit (although we had
0 bytes to retransmit), and eventaully (after around 30s) reset the
connection due to too many retransmits. Specifically this could cause the
iperf3 throughput tests in the testsuite to fail if set for a long enough
test period.
Correct this by initializing conn->seq_ack_from_tap to the ISN and only
advancing it when we actually get the first ACK (or SYN-ACK).
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
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Comments suggest that this should only be called for an ESTABLISHED
connection. However, it's non-trivial to ascertain that from the actual
control flow in the caller. Add an ASSERT() to make it very clear that
this is only called in ESTABLISHED state.
In fact, there were some circumstances where it could be called on a CLOSED
connection. In a sense that is "established", but with that assert this
does require specific (trivial) handling to avoid a spurious abort().
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
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