src/sys/netinet/tcp_output.c, branch release/6.0.0_cvs

This commit was manufactured by cvs2svn to create tag

2005-11-03T00:35:26+00:00

'RELENG_6_0_0_RELEASE'.

This commit was manufactured to restore the state of the 6.0-RELEASE image.

Replace t_force with a t_flag (TF_FORCEDATA).

2005-05-21T00:38:29+00:00

Submitted by:   Raja Mukerji.
Reviewed by:    Mohan, Silby, Andre Opperman.

When looking for the next hole to retransmit from the scoreboard,

2005-05-11T21:37:42+00:00

or to compute the total retransmitted bytes in this sack recovery
episode, the scoreboard is traversed. While in sack recovery, this
traversal occurs on every call to tcp_output(), every dupack and
every partial ack. The scoreboard could potentially get quite large,
making this traversal expensive.

This change optimizes this by storing hints (for the next hole to
retransmit and the total retransmitted bytes in this sack recovery
episode) reducing the complexity to find these values from O(n) to
constant time.

The debug code that sanity checks the hints against the computed
value will be removed eventually.

Submitted by:   Mohan Srinivasan, Noritoshi Demizu, Raja Mukerji.

Fix for interaction problems between TCP SACK and TCP Signature.

2005-04-21T20:26:07+00:00

If TCP Signatures are enabled, the maximum allowed sack blocks aren't
going to fit. The fix is to compute how many sack blocks fit and tack
these on last. Also on SYNs, defer padding until after the SACK
PERMITTED option has been added.

Found by:	Mohan Srinivasan.
Submitted by:	Mohan Srinivasan, Noritoshi Demizu.
Reviewed by:	Raja Mukerji.

Ignore ICMP Source Quench messages for TCP sessions. Source Quench is

2005-04-21T12:37:12+00:00

ineffective, depreciated and can be abused to degrade the performance
of active TCP sessions if spoofed.

Replace a bogus call to tcp_quench() in tcp_output() with the direct
equivalent tcpcb variable assignment.

Security:	draft-gont-tcpm-icmp-attacks-03.txt Section 7.1
MFC after:	3 days

Fix a TCP SACK related crash resulting from incorrect computation

2005-01-12T21:40:51+00:00

of len in tcp_output(), in the case where the FIN has already been
transmitted. The mis-computation of len is because of a gcc
optimization issue, which this change works around.

Submitted by:	Mohan Srinivasan

/* -> /*- for license, minor formatting changes

2005-01-07T01:45:51+00:00

Fixes a bug in SACK causing us to send data beyond the receive window.

2004-11-29T18:47:27+00:00

Found by: Pawel Worach and Daniel Hartmeier
Submitted by: Mohan Srinivasan mohans at yahoo-inc dot com

Remove RFC1644 T/TCP support from the TCP side of the network stack.

2004-11-02T22:22:22+00:00

A complete rationale and discussion is given in this message
and the resulting discussion:

 http://docs.freebsd.org/cgi/mid.cgi?4177C8AD.6060706

Note that this commit removes only the functional part of T/TCP
from the tcp_* related functions in the kernel.  Other features
introduced with RFC1644 are left intact (socket layer changes,
sendmsg(2) on connection oriented protocols)  and are meant to
be reused by a simpler and less intrusive reimplemention of the
previous T/TCP functionality.

Discussed on:	-arch

Correct a bug in TCP SACK that could result in wedging of the TCP stack

2004-10-30T12:02:50+00:00

under high load: only set function state to loop and continuing sending
if there is no data left to send.

RELENG_5_3 candidate.

Feet provided:	Peter Losher 
Diagnosed by:	Aniel Hartmeier 
Submitted by:	mohan