avoid is_ipv6 construct. a step towards IPv4-less kernel

bring in ECN support from KAME.
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

bring in ECN support from KAME.
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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use timeout(9) to schedule TCP timers. this avoid traversing all
tcp connections during tcp_slowtimo. apdapted from thorpej@netbsd.org

remove tcp_fasttimo and convert delayed acks to the timeout(9) API instead.
adapated from netbsd. okay angelos@

when retransmitting a segment after FIN has been sent don't set FIN
unless we are transmitting the last of our data. report from
jishac@grc.nasa.gov; pr/2368

knf

use macros to manage tcp timers; based on netbsd

KNF

Always defer output TCP checksumming until ip_output() (or hardware,
if it exists). Cuts down on code a bit, and we don't need to look at
the routing entry at TCP. Based on NetBSD. UDP case to follow.

Use in_cksum_phdr() rather than in_cksum() -- from NetBSD

Likewise, only use outgoing TCP/UDP hardware checksumming if the
interface is not in bridge mode.

Keep stats on TCP/UDP hardware checksumming.

TCP/UDP hardware checksumming. Untested, since txp dies when it tries
to compute the checksums. Still, it shouldn't affect anything.

fix up mtu for routes and ongoing tcp connection when if mtu changes
from FreeBSD; fixes pr/1878

Cut down on include files.

repair copyright notices for NRL & cmetz; cmetz

Two fixes from Stevens via davidg@freebsd, bug report by
armin@wolfermann.org

- set the persist timer so that connections in CLOSING state timeout
- honor keep-alive timer in CLOSING state.

Fixes t

Two fixes from Stevens via davidg@freebsd, bug report by
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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on expiry of pmtu route, retry higher mtu. okay angelos@

correctly calculate mss

Path MTU discovery based on NetBSD but with the decision to use the DF
flag delayed to ip_output(). That halves the code and reduces most of
the route lookups. okay deraadt@

various fixes to SACK and FACK from adesai@cisco.com, tomh@tomh.org and
osuga@mml.yrp.nttdocomo.co.jp

TCP SACK fixes via Tom Henderson (tomh@cs.berkeley.edu):
- tcp_sack_adjust() was completely rewritten, since it was erroneously
referencing receiver side sequence numbers and comparing with sender
si

TCP SACK fixes via Tom Henderson (tomh@cs.berkeley.edu):
- tcp_sack_adjust() was completely rewritten, since it was erroneously
referencing receiver side sequence numbers and comparing with sender
side sequence numbers (thanks to Arun Desai (adesai@cisco.com) who
discovered the problem)
- in tcp_output(), moved assignment of sendalot=0 to the piece of code
immediately following the search for sack-eligible retransmissions
(bug identified by Arun Desai).
- tcp_input() was not clearing t_dupacks if fewer than three dupacks arrived
between acks of new data. (bug identified by Gaurav Banga (gaurav@netapp.com))

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s/memset/bzero/
From: Michael Shalayeff <mickey@lucifier.dial-up.user.akula.net>

option TCP_NEWRENO goes away, its the default case for TCP_SACK if
SACK is disabled for the connection or via sysctl

never go into persist mode if there are still segments to be retransmitted.
set retransmit timer again if it was cleared, that can happen in SACK when
there are no elligble SACK holes to be retransmi

never go into persist mode if there are still segments to be retransmitted.
set retransmit timer again if it was cleared, that can happen in SACK when
there are no elligble SACK holes to be retransmitted and the receiver window
is full.

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