Commit Graph

484 Commits

Author SHA1 Message Date
mycroft 3a64270ca6 Back out the change from TCP/IP vol 2, in revision 1.7, which removed TH_FIN
from the output flags for CLOSING state.  There is no harm in retransmitting
the FIN, and this change has unexpected side effects that break simultaneous
close behaviour.
1998-07-09 05:49:56 +00:00
sommerfe 065cac9798 Delete bogus (void) cast of m_freem (which is already a void function..) 1998-07-07 00:04:59 +00:00
jonathan b37021c1a1 defopt NATM. 1998-07-05 22:48:05 +00:00
jonathan 9bf2ba0928 Garbage-collect ``needs-flag'' from attributes ether, fddi, arc:
NETHER, NFDDI, NARC are  not used anywhere. Remove #include "ether.h",
   which had no effect.
Removes clash with "options NATM" for native-ATM network protocol stack.
1998-07-05 22:29:51 +00:00
jonathan 011f2bda08 defopt NS, NSIP. 1998-07-05 06:49:00 +00:00
jonathan 5c0c5dd0b4 defopt ISO TPIP. 1998-07-05 04:37:35 +00:00
jonathan f2a2327e0a defopt EON. 1998-07-05 01:06:49 +00:00
jonathan 3751946b97 defopt INET, NETATALK. 1998-07-05 00:51:04 +00:00
jonathan 466e784ee1 defopt DDB. 1998-07-04 22:18:13 +00:00
thorpej 8cfe8959a6 Fix TCPS_HAVERCVDFIN() to actually catch all TCP states in which a FIN
has been received (CLOSE_WAIT, CLOSING, LAST_ACK, and TIME_WAIT).

From David Borman <dab@bsdi.com>.
1998-07-03 05:39:56 +00:00
is 0ca02c68a7 Thinko in last fix: we have to actually check each address for a copy on
our ifp, else we might fail for some strange configurations.
1998-07-02 14:00:39 +00:00
is d8b8a41918 The rewrite of if_arp.c to work with the hashed interface address lists
(1.44) missed a test for the right interface, making some machines answer
to some bogus arp requests (like for WHO-HAS 127.0.0.1).

The quick patch in 1.46-1.47 does not work for so-called "unnumbered"
interfaces, that is, (point-to-point) interfaces that share their local
address with another (e.g., the Ethernet) interface.

We add a macro to in_var.h, to step (in the current implementation) through
the hash chain and fine more entries with the same address, and use that
in if_arp.c to find one which belongs to our interface.
1998-07-02 11:39:56 +00:00
tls b0d2c08b6b Fix buglet where we might respond to arp on wrong interface. 1998-06-25 20:47:48 +00:00
cgd 651b44e211 Rework the way kernel include files are installed. In the new method,
as with user-land programs, include files are installed by each directory
in the tree that has includes to install.  (This allows more flexibility
as to what gets installed, makes 'partial installs' easier, and gives us
more options as to which machines' includes get installed at any given
time.)  The old SYS_INCLUDES={symlinks,copies} behaviours are _both_
still supported, though at least one bug in the 'symlinks' case is
fixed by this change.  Include files can't be build before installation,
so directories that have includes as targets (e.g. dev/pci) have to move
those targets into a different Makefile.
1998-06-12 23:22:30 +00:00
sommerfe a90d5cd12e Truncate mbufs to the correct length before forwarding; fixes pr5560 1998-06-10 00:47:57 +00:00
thorpej b22946827d Add a comment explaining why we do _not_ ACK data that might accompany
a SYN (avoidance of a DoS attack).
1998-06-02 18:33:02 +00:00
thorpej c296923d2f Loss window MUST be one segment, per draft-floyd-incr-init-win-03. 1998-06-02 17:22:26 +00:00
thorpej edc01ec330 In addition to the IP flow hash table, put the flows on a list. The table
is used for fast lookup, the list for traversal of all flows.  Also, use
PRT timers.
1998-06-02 15:48:03 +00:00
thorpej 837a8317b5 Eek, we were wasting almost half of the in_ifaddr hash space by modulo'ing
with IN_IFADDR_HASH_SIZE.  Instead, AND with the hash mask computed by
hashinit().
1998-06-01 00:50:07 +00:00
thorpej 08b5a4ecb8 Protect the ipflow_reap() call with splsoftnet. 1998-06-01 00:39:37 +00:00
cgd dd8ed56342 Another demonstration that when you're converting variables from 'long's
to fixed 32-bit integers, you have to exercise care.
1998-05-31 19:39:13 +00:00
veego 6250554a65 Fix compiler warnings: Add missing ()'s. 1998-05-29 20:28:17 +00:00
veego 630030601c Fix some compiler warnings: Missing prototype and ()'s. 1998-05-29 20:27:18 +00:00
veego a4c89e3e2e Resolve conflicts from the import of IPFilter 3.2.7. 1998-05-29 20:24:36 +00:00
matt c0a1601f95 Change arp so its console log messages print out IP addresses in
dotted quad format instead of hex.
1998-05-29 15:34:24 +00:00
thorpej f555f6d93f Fix OBOB in IP timestamp option processing, as noted in FreeBSD PR 6738,
from Jennifer Dawn Meyers <jdm@enteract.com>.
1998-05-24 20:14:53 +00:00
matt f070ddb8ed Move the ppcb pointer towards the front of the structure so that it and the
pcb chain pointers can possibly be in the same cache line.
1998-05-18 17:10:37 +00:00
matt 1b2b1d801b Fix two bugs. 1998-05-18 17:08:56 +00:00
veego 82423e3d01 Resolve conflicts 1998-05-17 16:50:15 +00:00
kml dd5ed34b88 Changed initialization of peermss to ensure that it didn't have
the TCP and IP options lengths removed from it -- the IP options can
change over the course of a connection...
1998-05-12 21:45:51 +00:00
thorpej c5fc2e9acd Back out previous. This problem was already fixed in a different way. 1998-05-11 23:13:40 +00:00
matt 53b04a8d3c Let usr.sbin/tcpdump build again. 1998-05-11 23:09:35 +00:00
thorpej 49573284f5 Make sure a timer is marked "disarmed" once it has expired. 1998-05-11 20:52:18 +00:00
thorpej 5596fe2614 Nuke TUBA per my note to tech-net; there's no reason to keep it around. 1998-05-11 19:57:23 +00:00
kml 1216b9a560 Change comments on tcp_mss_to_advertise to match actual arguments 1998-05-07 22:30:23 +00:00
thorpej ce3d776874 Rework the syn cache code somewhat:
- Don't use home-grown queue manipulation.  Use <sys/queue.h> instead.  The
  data structures are a little larger, but we are otherwise wasting the
  memory chunk anyway (we're already a 64-byte malloc bucket).
- Fix a bug in the cache-is-full case: if the oldest element removed from
  the first non-empty bucket was the only element in the bucket, the
  bucket wouldn't be removed from the bucket cache, causing queue corruption
  later.
- Optimize the syn cache timers by using PRT timers rather than home-grown
  decrement-and-propagate timers.

This code is now a fair bit smaller, and significantly easier to read
and understand.
1998-05-07 01:37:27 +00:00
thorpej dc49b0342e Define all TCP timers in terms of PRT timers. 1998-05-07 01:30:46 +00:00
thorpej 34e34c985a Use the monotonically increasing slow timer timestamp provided by
the protocol dispatch layer for TCP timers.  This saves having to
modify a potentially large number of timer values (which were shorts,
and expanded to ... a lot of code on the Alpha).
1998-05-06 01:24:38 +00:00
thorpej 1ffa60ac01 Use macros from tcp_timer.h to manipulate TCP timers, so that their
implementation can be changed easily.
1998-05-06 01:21:20 +00:00
matt 36eac04cc0 Default IP flow to being enabled. Add a sysctl to control the maximum
number of flows (net.inet.ip.maxflows).  If set to 0, will disable fast
path forwarding.
1998-05-04 19:24:53 +00:00
thorpej 447384d6b8 - kern/5380 (Dennis Ferguson): fix incremental IP header checksum.
- kern/5381 (Dennis Ferguson): check IP header checksum in fast forward
  code.
- In ipflow_slowtimo(), if no IP flows are in use, don't bother checking
  all of the hash buckets.
1998-05-04 05:46:04 +00:00
thorpej e44c4fb7d3 Once again, move a declaration for the benefit of TUBA (grumble). 1998-05-03 19:54:56 +00:00
thorpej b9fc258065 Oops, move a variable declaration so TUBA won't lose. 1998-05-02 04:23:05 +00:00
thorpej b71e4ddf4c Reintroduce the immediate ACK-on-PUSH behavior removed in revision 1.47,
but make the decision to do this dependent on the sysctl variable
net.inet.tcp.ack_on_push, which is disabled by default.
1998-05-02 04:21:58 +00:00
thorpej e1934b4c36 Correct a comment related to Congestion Window Monitoring. 1998-05-02 01:00:24 +00:00
thorpej be12c489b4 Garbage-collect. 1998-05-01 18:31:12 +00:00
thorpej 77af553e79 If packets are passed through IP Filter at all, don't allow fast-forward
flow entries to be created for them.

Eventually, IP Filter should be extended to allow IP src/dst pairs to
be specified as "fast forward OK".
1998-05-01 03:28:14 +00:00
thorpej 4452bc9a21 Allow packet filters to prevent a packet from creating a fast-forwarding
flow, by setting the "can fast forward" flag in the packet header, and
giving a chance for filters to clear the flag.  If the flag is still
set after the filters have given it a chance, the packet will be used
to create a fast-forward flow entry.
1998-05-01 03:23:24 +00:00
kml e173e7a084 Remove bogus black hole discovery code 1998-05-01 01:15:55 +00:00
thorpej ce40806e29 In the CWM code, don't use the Floyd initial window computation as
the burst size allowed, but rather a fixed number of packets, as
described in the Internet Draft.  Default allowed burst is 4 packets,
per the Draft.

Make the use of CWM and the allowed burst size tunable via sysctl.
1998-04-30 18:27:20 +00:00
thorpej e81920fa23 Make tcp_compat_42 a sysctl option. 1998-04-30 17:55:27 +00:00
thorpej 7e05be912b Need <net/route.h> 1998-04-30 17:47:26 +00:00
matt d4d709f7d0 Add support for "fast" forwarding. Add hooks in if_ethersubr.c and
if_fddisubr.c to fastpath IP forwarding.  If ip_forward successfully
forwards a packet, it will create a cache (ipflow) entry.  ether_input
and fddi_input will first call ipflow_fastforward with the received
packet and if the packet passes enough tests, it will be forwarded (the
ttl is decremented and the cksum is adjusted incrementally).
1998-04-29 21:37:52 +00:00
matt 37d70e3b46 defopt GATEWAY 1998-04-29 20:45:30 +00:00
matt 334f006538 New TCP reassembly code. The new code reduces the memory needed by
out-of-order packets and builds the infrastructure needed for sending
SACK blocks (to be added shortly).
1998-04-29 20:43:29 +00:00
thorpej 00d50da592 Fix some whitespace. 1998-04-29 05:44:47 +00:00
thorpej 13f972a4d6 Make use of the work-arounds for ancient broken TCP peers run-time
conditional (tcp_compat_42).  The kernel config option TCP_COMPAT_42
will still enable this by default, or disable this by default if the
option is not included (i.e. current behavior).  This will be made a
sysctl soon.
1998-04-29 05:16:46 +00:00
kml eadcaa201c change path MTU timeout value to match RFC 1191 1998-04-29 03:45:52 +00:00
kml 1579dcec47 Add support for deletion of routes added by path MTU discovery;
uses new generic route timeout code.  Add sysctl for timeout period.
1998-04-29 03:44:11 +00:00
thorpej 100bfaf39a Change RFC1323 timestamp update rule per Section 3.4 of RFC1323.bis. Old
rule was to update the timestamp if the sequence numbers are in range.  New
rule adds a check that the timestamp is advancing, thus preventing our notion
of the most recent timestamp from incorrectly moving backwards.
1998-04-29 00:43:46 +00:00
thorpej df750b93da Log the peer's IP address on received window scale factors larger than
TCP_MAX_WINSHIFT (14), as recommended in Section 2.3 of RFC1323.
1998-04-28 21:52:16 +00:00
matt 5b43c678b7 Only transmit fragments if the send queue of interface can actually hold
all of the fragments.  Use the mtu of route in preference of the MTU of the
interface when doing fragmentation decisions.  (ie. Fragment to the path
mtu if it is available).
1998-04-28 15:26:00 +00:00
kml fcf0227962 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.
1998-04-13 21:18:19 +00:00
thorpej 47b4697587 Remember any source routes that may have accompanied a SYN. 1998-04-07 05:09:19 +00:00
thorpej 04d3f25df8 Now that we have a flags word in the syn cache entry, use a flag to indicate
"peer will do timestamps" rather than a bitfield, and give the now-unsed
bit to the hash, making it now 32 bits.
1998-04-03 08:02:45 +00:00
thorpej b7c562b21c Clean up some comments wrt. the syn cache code. 1998-04-03 07:54:01 +00:00
thorpej 30fcf99ef8 Fix a bug which would cause a panic in soreceive() if multiple raw
receivers ask for ancillary data.

Noted by Francis Dupont <Francis.Dupont@inria.fr> on tech-net.
1998-04-03 07:49:16 +00:00
thorpej f9463514bf Implement Congestion Window Monitoring as described in the TCPIMPL
meeting of IETF #41 by Amy Hughes <ahughes@isi.edu>, and in an upcoming
internet draft from Hughes, Touch, and Heidemann.

CWM eliminates line-rate bursts after idle periods by counting pending
(unacknowledged) packets and limiting the congestion window to the
initial congestion window plus the pending packet count.  This has the
effect of allowing us to use the window as long as we continue to transmit,
but as soon as we stop transmitting, we go back to a slow-start (also known
as `use it or lose it').

This is not enabled by default.  You can enable this behavior by patching
the "tcp_cwm" global (set it to non-zero) or by building a kernel with the
TCP_CWM option.
1998-04-01 22:15:52 +00:00
thorpej 1b176d9395 Back out a change made some time ago, that would cause the NetBSD TCP
to ACK immediately any packet that arrived with PSH set.  This breaks
delayed ACKs in a few specific common cases that delayed ACKs were
supposed to help, and ends up not making much (if any) difference in
the case where where this ACK-on-PSH change was supposed to help.

Per discussion with several members of the TCPIMPL and TCPSAT IETF
working groups.
1998-03-31 23:44:09 +00:00
thorpej 2da6c91259 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.
1998-03-31 22:49:09 +00:00
scottr 81a5bfdf33 Change from IP-Filter 3.2.3: avoid infinite loop in nat_new() when
NAT'ing to a single IP address.
1998-03-29 22:56:00 +00:00
thorpej d725b1a332 Remove a comment in tcp_mss_to_advertise() that no longer applies. 1998-03-28 19:39:57 +00:00
kml 96954c2a53 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.
1998-03-24 03:10:02 +00:00
kml 123232e156 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.
1998-03-19 22:29:33 +00:00
mrg 45159fa631 convert pfil(9) in and out lists from <sys/queue.h> LISTs to TAILQs, and
change pfil_add_hook to put output filters at the tail of the queue,
while continuing to place input filters at the head of the queue.  update
the two users of these functions, and document these changes.

fixes PR#4593.
1998-03-19 15:45:30 +00:00
kml ffb211fb9d 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).
1998-03-17 23:50:30 +00:00
thorpej 5837cc6b07 Update copyright (sigh, should have done this long ago). 1998-02-19 02:36:42 +00:00
tls 91de585d5f Add correct copyright notice for IP address hash change. This code is donated to TNF by the original copyright holder, Panix. 1998-02-15 18:24:23 +00:00
tls c9934a9084 Change list of interface IP addresses to a hash. Improves performance on hosts with a large number of IP addresses significantly. 1998-02-13 18:21:38 +00:00
kleink a8bd1c7e84 Fix variable declarations: register -> register int. 1998-02-13 10:23:49 +00:00
perry f73530ba55 add/cleanup multiple inclusion protection. 1998-02-10 01:26:19 +00:00
chs f64abc7b4c add flags arg to hashinit(), to pass to malloc(). 1998-02-07 02:44:44 +00:00
mellon 27a5a0a616 Take PCB off delayed ack queue before freeing. 1998-01-30 08:42:11 +00:00
thorpej 4c54445530 Use offsetof() from libkern.h 1998-01-28 02:35:10 +00:00
mellon 5685520ac1 Always set sc->sc_timeout (it was missed in one case). This fixes a problem where SYN cache entries are sometimes timed out almost immediately. 1998-01-24 12:27:31 +00:00
mycroft 5ab55e91b7 Fix an old editing error from merging a bug fix into Lite,
that might cause us to erroneously drop a FIN.
Also, minor changes so the code looks more like Stevens vol 2 figure 28.30.
1998-01-24 05:04:27 +00:00
mellon babb710a0b Never free the mbuf that we give to tcp_respond(). The previous change corrected an inconsistency but in exactly the wrong way. 1998-01-21 01:21:22 +00:00
mellon ac489008ad In syn_cache_get(), don't free incoming packet before jumping to resetandabort, but do free it after sending the reset. 1998-01-18 05:56:15 +00:00
scottr 54ea074777 Use option header file for MROUTING 1998-01-12 03:02:48 +00:00
scottr 3cdcd5e1c7 Use option header file for TCP_COMPAT_42 1998-01-12 03:00:42 +00:00
lukem c0e8ee54e9 * start from the top of the given ephemeral range and work down;
results in reserved ephemeral ports starting at the top (as per
  current practice), and shouldn't have a negative effect on normal
  ephemeral ports...
* initialise inpt_lastlow in in_pcbinit
1998-01-08 11:56:50 +00:00
lukem 1a63d90320 add missing ; ... 1998-01-08 00:32:39 +00:00
lukem c80b4400e5 add the following, derived from FreeBSD:
* IP_PORTRANGE socket option, which controls how the ephemeral ports
  are allocated. it takes the following settings:
	IP_PORTRANGE_DEFAULT	use anonportmin (49152) -> anonportmax (65535)
	IP_PORTRANGE_HIGH	as IP_PORTRANGE_DEFAULT (retained for FreeBSD
				compat reasons, where these are separate)
	IP_PORTRANGE_LOW	use 600 -> 1023. only works if uid==0.
* in_pcb flag INP_ANONPORT. set if port was allocated ephmerally
1998-01-07 22:51:22 +00:00
thorpej e5e283e02d Finishing merging 4.4BSD-Lite2 netinet. At this point, the only changes
left were SCCS IDs and Copyright dates.
1998-01-05 10:31:44 +00:00
lukem 1f8f74b669 enhance ephemeral port allocation code:
* support sysctl net.inet.ip.anonportmin (lowest ephemeral port)
  and net.inet.ip.anonportmax (highest ephemeral port).
  these can't be set to >65535, < IPPORT_RESERVED (unless IPNOPRIVPORTS
  is defined), and anonportmin has to be < anonportmax.
* use a cleaner way of only cycling through the available set once;
  this will be useful for when a random allocation scheme is used
* define IPPORT_ANON{MIN,MAX} instead of IPPORT_USER{LOW,HIGH}
1998-01-05 09:52:02 +00:00
thorpej 2e85747e9e From 4.4BSD-Lite2 (noted by Frank van der Linden):
so_linger is used as an argument to tsleep(), so was stuffed with
clockticks for the TCP linger time.  However, so_linger is set directly from
l_linger if the linger time is specified, and l_linger is seconds (although
this is not currently documented anywhere).  Fix this to set the TCP
linger time in seconds, and multiply so_linger by hz when tsleep() is
called to actually perform the linger.
1998-01-05 09:12:29 +00:00
thorpej 673fb149c6 Implement a queue for delayed ACK processing. This queue is used in
tcp_fasttimo() in lieu of scanning all open TCP connections.
1997-12-31 03:31:23 +00:00
lukem 0b57ba7265 as per the IANA assigned ports numbers document, use ports
49152..65535 for ephemeral ports (instead of 1024..5000).
closes my [kern/4440], but with correct code :)
1997-12-30 02:54:08 +00:00
thorpej 3c5ff3879d Keep stats on connections dropped due to excessive persist timeout. 1997-12-17 06:06:41 +00:00
thorpej 04ec3df592 From 4.4BSD-Lite2:
- When running the slow timers, skip PCBs in LISTEN state.
- When processing the persist timer, drop the connection if the connection
  idle time exceeds the maximum backoff for retransmit.  Part of
  kern/2335 (pete@daemon.net).
1997-12-17 06:04:17 +00:00