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it consists of
- ECN support in TCP
- tunnel-egress and fragment reassembly rules in layer-3 not to lose
congestion info at tunnel-egress and fragment reassembly
to enable ECN in TCP, build a kernel with TCP_ECN, and then,
turn it on by "sysctl -w net.inet.tcp.ecn=1".
ok deraadt@
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tcp connections during tcp_slowtimo. apdapted from thorpej@netbsd.org
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adapated from netbsd. okay angelos@
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armin@wolfermann.org
- set the persist timer so that connections in CLOSING state timeout
- honor keep-alive timer in CLOSING state.
Fixes the problem in simulaneous close situation where connections
would never leave the CLOSING state and stay arround indefinitly.
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flag delayed to ip_output(). That halves the code and reduces most of
the route lookups. okay deraadt@
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SACK is disabled for the connection or via sysctl
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Adapted from NetBSD:
Fix a retransmission bug introduced by the Brakmo and Peterson
RTO estimation changes. Under some circumstances it would
return a value of 0, while the old Van Jacobson RTO code would
return a minimum of 3. This would result in 12 retransmissions,
each 1 second apart. This takes care of those instances, and
ensures that t_rttmin is used everywhere as a lower bound.
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protocols.
"struct tcpiphdr" is now gone from much of the code, as are separate pointers
for ti and ti6. The result is fewer variables, which is generally a good thing.
Simple if(is_ipv6) ... else ... tests are gone in favor of a
switch(protocol family), which allows future new protocols to be added easily.
This also makes it possible for someone so inclined to re-implement TUBA (TCP
over CLNP?) and do it right instead of the kluged way it was done in 4.4.
The TCP header template is now referenced through a mbuf rather than done
through a data pointer and dtom()ed as needed. This is partly because dtom() is
evil and partly because max_linkhdr + IPv6 + TCP + MSS/TS/SACK opts won't fit
inside a packet header mbuf, so we need to grab a cluster for that (which the
code now does, if needed).
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Fixed a sequence wraparound bug in the snd_recover variable discovered in
very large (multiple GByte) transfers (in loss free conditions, snd_recover
was not sufficiently tracking snd_una). Thanks to Mark Smith for finding
this.
Fixed a bug in tcp_newreno that was preventing retransmission of data due
to partial acks. (Discovered by Jayanth Vijayaraghavan)
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already been cleared of the acked data, though it was called before any
sbdrop() call and always called tcp_output() with 0 index in the send
socket buffer and thus causing data corruption. so do not set snd_una to
th_ack.
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by Hari Balakrishnan (hari@lcs.mit.edu), Tom Henderson (tomh@cs.berkeley.edu)
and Venkat Padmanabhan (padmanab@cs.berkeley.edu) as part of the
Daedalus research group at the University of California,
(http://daedalus.cs.berkeley.edu). [I was able to do this on time spent
at the Center for Information Technology Integration (citi.umich.edu)]
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alpha :-)
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