Fix to ensure that the correct MSS is advertised for loopback
TCP connections by using the MTU of the interface. Also added
a knob, mss_ifmtu, to force all connections to use the MTU of
the interfac

Fix to ensure that the correct MSS is advertised for loopback
TCP connections by using the MTU of the interface. Also added
a knob, mss_ifmtu, to force all connections to use the MTU of
the interface to calculate the advertised MSS.

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Fix a potential-congestion case in the larger initial congestion window
code, as clarified in the TCPIMPL WG meeting at IETF #41: If the SYN
(active open) or SYN,ACK (passive open) was retransmitted,

Fix a potential-congestion case in the larger initial congestion window
code, as clarified in the TCPIMPL WG meeting at IETF #41: If the SYN
(active open) or SYN,ACK (passive open) was retransmitted, the initial
congestion window for the first slow start of that connection must be
one segment.

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Remove a comment in tcp_mss_to_advertise() that no longer applies.

Ensure that we take the IP option length into account when we calculate
the effective maximum send size for TCP. ip_optlen() and tcp_optlen()
should probably be inlined for efficiency.

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 minim

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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Ensure that the TCP segment size reflects the size of TCP options
in the packet. This fixes a bug that was resulting in extra packets
in retransmissions (the second packet would be 12 bytes long,
re

Ensure that the TCP segment size reflects the size of TCP options
in the packet. This fixes a bug that was resulting in extra packets
in retransmissions (the second packet would be 12 bytes long,
reflecting the RFC1323 timestamp option size).

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Update copyright (sigh, should have done this long ago).

Take PCB off delayed ack queue before freeing.

Use option header file for TCP_COMPAT_42

Finishing merging 4.4BSD-Lite2 netinet. At this point, the only changes
left were SCCS IDs and Copyright dates.

Implement a queue for delayed ACK processing. This queue is used in
tcp_fasttimo() in lieu of scanning all open TCP connections.

Implement an infrastructure to allow larger initial congestion windows.
The sysctl'able variable "tcp_init_win", when set to 0, selects an
auto-tuning algorithm for selecting the initial window, base

Implement an infrastructure to allow larger initial congestion windows.
The sysctl'able variable "tcp_init_win", when set to 0, selects an
auto-tuning algorithm for selecting the initial window, based on transmit
segment size, per discussion in the IETF tcpimpl working group.

Default initial window is still 1 segment, but will soon become 2 segments,
per discussion in tcpimpl.

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Implement tcp_drain().

Remove an extraneous call to rtfree() in the path mtu discovery code;
this was causing negative reference counts on routes...

TCP MSS fixes to provide cleaner slow-start and recovery.

change sysctl net.inet.icmp.mtudisc to net.inet.ip.mtudisc

Path MTU Discovery support. This is turned off by default.
Use sysctl -w net.inet.icmp.mtudisc=1 to turn on.
Still to come: path removal after some period, black hole detection

o Make usage of /dev/random dependant on
pseudo-device rnd # /dev/random and in-kernel generator
in config files.

o Add declaration to all architectures.

o Clean up copyri

o Make usage of /dev/random dependant on
pseudo-device rnd # /dev/random and in-kernel generator
in config files.

o Add declaration to all architectures.

o Clean up copyright message in rnd.c, rnd.h, and rndpool.c to include
that this code is derived in part from Ted Tyso's linux code.

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Add hooks to use the kernel random system to generate TCP sequence numbers.

Fix several annoyances related to MSS handling in BSD TCP:
- Don't overload t_maxseg. Previous behavior was to set it to the min
of the peer's advertised MSS, our advertised MSS, and tcp_mssdflt

Fix several annoyances related to MSS handling in BSD TCP:
- Don't overload t_maxseg. Previous behavior was to set it to the min
of the peer's advertised MSS, our advertised MSS, and tcp_mssdflt
(for non-local networks). This breaks PMTU discovery running on
either host. Instead, remember the MSS we advertise, and use it
as appropriate (in silly window avoidance).
- Per last bullet, split tcp_mss() into several functions for handling
MSS (ours and peer's), and performing various tasks when a connection
becomes ESTABLISHED.
- Introduce a new function, tcp_segsize(), which computes the max size
for every segment transmitted in tcp_output(). This will eventually
be used to hook in PMTU discovery.

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Pull SYN_cache_branch down into the main line.

Eliminate use of dtom() from the network code, allowing more flexible
use of mbuf external storage and increasing performance (by eliminating
an m_pullup() for clusters in the IP reassembly code).

C

Eliminate use of dtom() from the network code, allowing more flexible
use of mbuf external storage and increasing performance (by eliminating
an m_pullup() for clusters in the IP reassembly code).

Changes from Koji Imada <koji@math.human.nagoya-u.ac.jp>, in PR #3628
and #3480, with ever-so-slight integration changes by me.

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Fix RTT scaling problems introduced with Brakmo and Peterson changes.

Hash unconnected PCBs.

Add in_nullhost() and in_hosteq() macros, to hide some protocol
details. Also, fix a bug in TCP wrt SYN+URG packets.