Commit Graph

47 Commits

Author SHA1 Message Date
Poul-Henning Kamp
19ddafa3b3 RFC 1644 has the status "Experimental Protocol", which means:
4.1.4.  Experimental Protocol

      A system should not implement an experimental protocol unless it
      is participating in the experiment and has coordinated its use of
      the protocol with the developer of the protocol.

Pointed out by:	Steinar Haug <sthaug@nethelp.no>
1998-09-06 08:17:35 +00:00
Doug Rabson
6effc71332 Re-implement tcp and ip fragment reassembly to not store pointers in the
ip header which can't work on alpha since pointers are too big.

Reviewed by: Garrett Wollman <wollman@khavrinen.lcs.mit.edu>
1998-08-24 07:47:39 +00:00
Garrett Wollman
98271db4d5 Convert socket structures to be type-stable and add a version number.
Define a parameter which indicates the maximum number of sockets in a
system, and use this to size the zone allocators used for sockets and
for certain PCBs.

Convert PF_LOCAL PCB structures to be type-stable and add a version number.

Define an external format for infomation about socket structures and use
it in several places.

Define a mechanism to get all PF_LOCAL and PF_INET PCB lists through
sysctl(3) without blocking network interrupts for an unreasonable
length of time.  This probably still has some bugs and/or race
conditions, but it seems to work well enough on my machines.

It is now possible for `netstat' to get almost all of its information
via the sysctl(3) interface rather than reading kmem (changes to follow).
1998-05-15 20:11:40 +00:00
Bruce Evans
8781d8e928 Fixed style bugs (mostly) in previous commit. 1998-03-28 10:18:26 +00:00
Garrett Wollman
3d4d47f398 Use the zone allocator to allocate inpcbs and tcpcbs. Each protocol creates
its own zone; this is used particularly by TCP which allocates both inpcb and
tcpcb in a single allocation.  (Some hackery ensures that the tcpcb is
reasonably aligned.)  Also keep track of the number of pcbs of each type
allocated, and keep a generation count (instance version number) for future
use.
1998-03-24 18:06:34 +00:00
David Greenman
c3229e05a3 Improved connection establishment performance by doing local port lookups via
a hashed port list. In the new scheme, in_pcblookup() goes away and is
replaced by a new routine, in_pcblookup_local() for doing the local port
check. Note that this implementation is space inefficient in that the PCB
struct is now too large to fit into 128 bytes. I might deal with this in the
future by using the new zone allocator, but I wanted these changes to be
extensively tested in their current form first.

Also:
1) Fixed off-by-one errors in the port lookup loops in in_pcbbind().
2) Got rid of some unneeded rehashing. Adding a new routine, in_pcbinshash()
   to do the initialial hash insertion.
3) Renamed in_pcblookuphash() to in_pcblookup_hash() for easier readability.
4) Added a new routine, in_pcbremlists() to remove the PCB from the various
   hash lists.
5) Added/deleted comments where appropriate.
6) Removed unnecessary splnet() locking. In general, the PCB functions should
   be called at splnet()...there are unfortunately a few exceptions, however.
7) Reorganized a few structs for better cache line behavior.
8) Killed my TCP_ACK_HACK kludge. It may come back in a different form in
   the future, however.

These changes have been tested on wcarchive for more than a month. In tests
done here, connection establishment overhead is reduced by more than 50
times, thus getting rid of one of the major networking scalability problems.

Still to do: make tcp_fastimo/tcp_slowtimo scale well for systems with a
large number of connections. tcp_fastimo is easy; tcp_slowtimo is difficult.

WARNING: Anything that knows about inpcb and tcpcb structs will have to be
         recompiled; at the very least, this includes netstat(1).
1998-01-27 09:15:13 +00:00
Eivind Eklund
92252381f3 Make TCP_COMPAT_42 a new style option. 1998-01-25 04:23:33 +00:00
Julian Elischer
45d6875df6 Fix an incredibly horrible bug in the ipfw code
where if you are using the "reset tcp" firewall command,
the kernel would write ethernet headers onto random kernel stack locations.

Fought to the death by: terry, julian, archie.
fix valid for 2.2 series as well.
1997-12-19 03:36:15 +00:00
Bruce Evans
55b211e3af Removed unused #includes. 1997-10-28 15:59:26 +00:00
Joerg Wunsch
0cc12cc57e Make TCPDEBUG a new-style option. 1997-09-16 18:36:06 +00:00
Bruce Evans
514ede0953 Fixed gratuitous ANSIisms. 1997-09-16 11:44:05 +00:00
David Greenman
ca98b82c8d Reorganize elements of the inpcb struct to take better advantage of
cache lines. Removed the struct ip proto since only a couple of chars
were actually being used in it. Changed the order of compares in the
PCB hash lookup to take advantage of partial cache line fills (on PPro).

Discussed-with: wollman
1997-04-03 05:14:45 +00:00
David Greenman
ddd79a9790 Improved performance of hash algorithm while (hopefully) not reducing
the quality of the hash distribution. This does not fix a problem dealing
with poor distribution when using lots of IP aliases and listening
on the same port on every one of them...some other day perhaps; fixing
that requires significant code changes.
The use of xor was inspired by David S. Miller <davem@jenolan.rutgers.edu>
1997-03-03 09:23:37 +00:00
Peter Wemm
6875d25465 Back out part 1 of the MCFH that changed $Id$ to $FreeBSD$. We are not
ready for it yet.
1997-02-22 09:48:43 +00:00
Garrett Wollman
d0390e0570 Fix the mechanism for choosing wehether to save the slow-start threshold
in the route.  This allows us to remove the unconditional setting of the
pipesize in the route, which should mean that SO_SNDBUF and SO_RCVBUF
should actually work again.  While we're at it:

- Convert udp_usrreq from `mondo switch statement from Hell' to new-style.
- Delete old TCP mondo switch statement from Hell, which had previously
  been diked out.
1997-02-14 18:15:53 +00:00
Jordan K. Hubbard
1130b656e5 Make the long-awaited change from $Id$ to $FreeBSD$
This will make a number of things easier in the future, as well as (finally!)
avoiding the Id-smashing problem which has plagued developers for so long.

Boy, I'm glad we're not using sup anymore.  This update would have been
insane otherwise.
1997-01-14 07:20:47 +00:00
Garrett Wollman
5e2d069649 Eliminate some more references to separate ip_v and ip_hl fields. 1996-07-24 18:46:19 +00:00
Garrett Wollman
51fb392203 Better selection of initial retransmit timeout when no cached
RTT information is available.

Submitted by: kbracey@art.acorn.co.uk (Kevin Bracey)
(slightly modified by me)
1996-06-14 17:17:32 +00:00
Garrett Wollman
6da5712b60 Correct formula for TCP RTO calculation. Also try to do a better job in
filling in a new PCB's rttvar (but this is not the last word on the subject).
And get rid of `#ifdef RTV_RTT', it's been true for four years now...
1996-06-05 16:57:38 +00:00
Garrett Wollman
ebcae94e4f In tcp_respond(), check that ro->ro_rt is non-null before RTFREEing
it.
1996-03-27 18:23:16 +00:00
Garrett Wollman
9512fd2ec6 Make sure tcp_respond() always calls ip_output() with a valid
route pointer.  This has no effect in the current ip_output(),
but my version requires that ip_output() always be passed a route.
1996-03-22 18:11:25 +00:00
David Greenman
2ee45d7d28 Move or add #include <queue.h> in preparation for upcoming struct socket
changes.
1996-03-11 15:13:58 +00:00
Garrett Wollman
bda4c85ae6 Fix a nagging divide-by-zero error resulting from the MTU discovery code
getting triggered at a bad time.
1995-12-20 17:42:28 +00:00
Bruce Evans
b62d102cbb Uniformized pr_ctlinput protosw functions. The third arg is now `void
*' instead of caddr_t and it isn't optional (it never was).  Most of the
netipx (and netns) pr_ctlinput functions abuse the second arg instead of
using the third arg but fixing this is beyond the scope of this round
of changes.
1995-12-16 02:14:44 +00:00
Garrett Wollman
b7a44e3486 Path MTU Discovery is now standard. 1995-12-05 17:46:50 +00:00
Poul-Henning Kamp
0312fbe97d New style sysctl & staticize alot of stuff. 1995-11-14 20:34:56 +00:00
Poul-Henning Kamp
98163b98dc Start adding new style sysctl here too. 1995-11-09 20:23:09 +00:00
Garrett Wollman
3d1f141b23 The ability to administratively change the MTU of an interface presents
a few new wrinkles for MTU discovery which tcp_output() had better
be prepared to handle.  ip_output() is also modified to do something
helpful in this case, since it has already calculated the information
we need.
1995-10-16 18:21:26 +00:00
Garrett Wollman
3abc79d2ee The additional checks involving sequence numbers in MTU discovery resends
turned out not to be necessary; simply watching for MTU decreases (which
we already did) automagically eliminates all the cases we were trying to
protect against.
1995-10-12 17:37:25 +00:00
Garrett Wollman
143d7a5499 More MTU discovery: avoid over-retransmission if route changes in the
middle of a fully-open window.  Also, keep track of how many retransmits
we do as a result of MTU discovery.  This may actually do more work than
necessary, but it's an unusual condition...

Suggested by: Janey Hoe <janey@lcs.mit.edu>
1995-10-10 17:45:43 +00:00
Garrett Wollman
e79adb8ed6 Finish 4.4-Lite-2 merge: randomize TCP initial sequence numbers
to make ISS-guessing spoofing attacks harder.
1995-10-03 16:54:17 +00:00
Garrett Wollman
f001bbb882 Correct spelling error in MTUDISC code. 1995-09-22 17:43:37 +00:00
Garrett Wollman
f138387af1 Add support in TCP for Path MTU discovery. This is highly experimental
and gated on `options MTUDISC' in the source.  It is also practically
untested becausse (sniff!) I don't have easy access to a network with
an MTU of less than an Ethernet.  If you have a small MTU network,
please try it and tell me if it works!
1995-09-20 21:00:59 +00:00
Garrett Wollman
5cbf3e086c Initial back-end support for IP MTU discovery, gated on MTUDISC. The support
for TCP has yet to be written.
1995-09-18 15:51:40 +00:00
Garrett Wollman
fc97827135 Keep track of the number of samples through the srtt filter so that we
know better when to cache values in the route, rather than relying on a
heuristic involving sequence numbers that broke when tcp_sendspace
was increased to 16k.
1995-06-29 18:11:24 +00:00
Garrett Wollman
9167720192 Now that we've gone to all sorts of effort to allow TCP to cache some of
its connection parameters, we want to keep statistics on how often this
actually happens to see whether there is any work that needs to be done in
TCP itself.

Suggested by: John Wroclawski <jtw@lcs.mit.edu>
1995-06-19 16:45:33 +00:00
Rodney W. Grimes
9b2e535452 Remove trailing whitespace. 1995-05-30 08:16:23 +00:00
David Greenman
15bd2b4385 Implemented PCB hashing. Includes new functions in_pcbinshash, in_pcbrehash,
and in_pcblookuphash.
1995-04-09 01:29:31 +00:00
Bruce Evans
b5e8ce9f12 Add and move declarations to fix all of the warnings from `gcc -Wimplicit'
(except in netccitt, netiso and netns) and most of the warnings from
`gcc -Wnested-externs'.  Fix all the bugs found.  There were no serious
ones.
1995-03-16 18:17:34 +00:00
Nate Williams
9617d8b1f6 Removed unnecessary define for TCPOUTFLAGS since they are not used. 1995-03-06 02:49:24 +00:00
Garrett Wollman
41f82abe5a Transaction TCP support now standard. Hack away! 1995-02-16 00:55:44 +00:00
Garrett Wollman
a0292f2375 Merge Transaction TCP, courtesy of Andras Olah <olah@cs.utwente.nl> and
Bob Braden <braden@isi.edu>.

NB: This has not had David's TCP ACK hack re-integrated.  It is not clear
what the correct solution to this problem is, if any.  If a better solution
doesn't pop up in response to this message, I'll put David's code back in
(or he's welcome to do so himself).
1995-02-09 23:13:27 +00:00
Poul-Henning Kamp
ac0776aed7 Cosmetics: silences gcc -Wall. 1994-10-08 22:39:58 +00:00
Poul-Henning Kamp
623ae52e4e GCC cleanup.
Reviewed by:
Submitted by:
Obtained from:
1994-10-02 17:48:58 +00:00
David Greenman
3c4dd3568f Added $Id$ 1994-08-02 07:55:43 +00:00
Rodney W. Grimes
26f9a76710 The big 4.4BSD Lite to FreeBSD 2.0.0 (Development) patch.
Reviewed by:	Rodney W. Grimes
Submitted by:	John Dyson and David Greenman
1994-05-25 09:21:21 +00:00
Rodney W. Grimes
df8bae1de4 BSD 4.4 Lite Kernel Sources 1994-05-24 10:09:53 +00:00