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286
CHANGELOG
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Changelog that precedes the move to Savannah:
(0.5.3) Changes since version 0.5.2
++ Bugfixes:
* memp_malloc(MEMP_API_MSG) could fail with multiple application
threads because it wasn't protected by semaphores.
++ Other changes:
* struct ip_addr now packed.
* The name of the time variable in arp.c has been changed to ctime
to avoid conflicts with the time() function.
(0.5.2) Changes since version 0.5.1
++ New features:
* A new TCP function, tcp_tmr(), now handles both TCP timers.
++ Bugfixes:
* A bug in tcp_parseopt() could cause the stack to hang because of a
malformed TCP option.
* The address of new connections in the accept() function in the BSD
socket library was not handled correctly.
* pbuf_dechain() did not update the ->tot_len field of the tail.
* Aborted TCP connections were not handled correctly in all
situations.
++ Other changes:
* All protocol header structs are now packed.
* The ->len field in the tcp_seg structure now counts the actual
amount of data, and does not add one for SYN and FIN segments.
(0.5.1) Changes since version 0.5.0
++ New features:
* Possible to run as a user process under Linux.
* Preliminary support for cross platform packed structs.
* ARP timer now implemented.
++ Bugfixes:
* TCP output queue length was badly initialized when opening
connections.
* TCP delayed ACKs were not sent correctly.
* Explicit initialization of BSS segment variables.
* read() in BSD socket library could drop data.
* Problems with memory alignment.
* Situations when all TCP buffers were used could lead to
starvation.
* TCP MSS option wasn't parsed correctly.
* Problems with UDP checksum calculation.
* IP multicast address tests had endianess problems.
* ARP requests had wrong destination hardware address.
++ Other changes:
* struct eth_addr changed from u16_t[3] array to u8_t[6].
* A ->linkoutput() member was added to struct netif.
* TCP and UDP ->dest_* struct members where changed to ->remote_*.
* ntoh* macros are now null definitions for big endian CPUs.
(0.5.0) Changes since version 0.4.2
++ New features:
* Redesigned operating system emulation layer to make porting easier.
* Better control over TCP output buffers.
* Documenation added.
++ Bugfixes:
* Locking issues in buffer management.
* Bugfixes in the sequential API.
* IP forwarding could cause memory leakage. This has been fixed.
++ Other changes:
* Directory structure somewhat changed; the core/ tree has been
collapsed.
(0.4.2) Changes since version 0.4.1
++ New features:
* Experimental ARP implementation added.
* Skeleton Ethernet driver added.
* Experimental BSD socket API library added.
++ Bugfixes:
* In very intense situations, memory leakage could occur. This has
been fixed.
++ Other changes:
* Variables named "data" and "code" have been renamed in order to
avoid name conflicts in certain compilers.
* Variable++ have in appliciable cases been translated to ++variable
since some compilers generate better code in the latter case.
(0.4.1) Changes since version 0.4
++ New features:
* TCP: Connection attempts time out earlier than data
transmissions. Nagle algorithm implemented. Push flag set on the
last segment in a burst.
* UDP: experimental support for UDP-Lite extensions.
++ Bugfixes:
* TCP: out of order segments were in some cases handled incorrectly,
and this has now been fixed. Delayed acknowledgements was broken
in 0.4, has now been fixed. Binding to an address that is in use
now results in an error. Reset connections sometimes hung an
application; this has been fixed.
* Checksum calculation sometimes failed for chained pbufs with odd
lengths. This has been fixed.
* API: a lot of bug fixes in the API. The UDP API has been improved
and tested. Error reporting and handling has been
improved. Logical flaws and race conditions for incoming TCP
connections has been found and removed.
* Memory manager: alignment issues. Reallocating memory sometimes
failed, this has been fixed.
* Generic library: bcopy was flawed and has been fixed.
++ Other changes:
* API: all datatypes has been changed from generic ones such as
ints, to specified ones such as u16_t. Functions that return
errors now have the correct type (err_t).
* General: A lot of code cleaned up and debugging code removed. Many
portability issues have been fixed.
* The license was changed; the advertising clause was removed.
* C64 port added.
* Thanks: Huge thanks go to Dagan Galarneau, Horst Garnetzke, Petri
Kosunen, Mikael Caleres, and Frits Wilmink for reporting and
fixing bugs!
(0.4) Changes since version 0.3.1
* Memory management has been radically changed; instead of
allocating memory from a shared heap, memory for objects that are
rapidly allocated and deallocated is now kept in pools. Allocation
and deallocation from those memory pools is very fast. The shared
heap is still present but is used less frequently.
* The memory, memory pool, and packet buffer subsystems now support
4-, 2-, or 1-byte alignment.
* "Out of memory" situations are handled in a more robust way.
* Stack usage has been reduced.
* Easier configuration of lwIP parameters such as memory usage,
TTLs, statistics gathering, etc. All configuration parameters are
now kept in a single header file "lwipopts.h".
* The directory structure has been changed slightly so that all
architecture specific files are kept under the src/arch
hierarchy.
* Error propagation has been improved, both in the protocol modules
and in the API.
* The code for the RTXC architecture has been implemented, tested
and put to use.
* Bugs have been found and corrected in the TCP, UDP, IP, API, and
the Internet checksum modules.
* Bugs related to porting between a 32-bit and a 16-bit architecture
have been found and corrected.
* The license has been changed slightly to conform more with the
original BSD license, including the advertisement clause.
(0.3.1) Changes since version 0.3
* Fix of a fatal bug in the buffer management. Pbufs with allocated
RAM never returned the RAM when the pbuf was deallocated.
* TCP congestion control, window updates and retransmissions did not
work correctly. This has now been fixed.
* Bugfixes in the API.
(0.3) Changes since version 0.2
* New and improved directory structure. All include files are now
kept in a dedicated include/ directory.
* The API now has proper error handling. A new function,
netconn_err(), now returns an error code for the connection in
case of errors.
* Improvements in the memory management subsystem. The system now
keeps a pointer to the lowest free memory block. A new function,
mem_malloc2() tries to allocate memory once, and if it fails tries
to free some memory and retry the allocation.
* Much testing has been done with limited memory
configurations. lwIP now does a better job when overloaded.
* Some bugfixes and improvements to the buffer (pbuf) subsystem.
* Many bugfixes in the TCP code:
- Fixed a bug in tcp_close().
- The TCP receive window was incorrectly closed when out of
sequence segments was received. This has been fixed.
- Connections are now timed-out of the FIN-WAIT-2 state.
- The initial congestion window could in some cases be too
large. This has been fixed.
- The retransmission queue could in some cases be screwed up. This
has been fixed.
- TCP RST flag now handled correctly.
- Out of sequence data was in some cases never delivered to the
application. This has been fixed.
- Retransmitted segments now contain the correct acknowledgment
number and advertised window.
- TCP retransmission timeout backoffs are not correctly computed
(ala BSD). After a number of retransmissions, TCP now gives up
the connection.
* TCP connections now are kept on three lists, one for active
connections, one for listening connections, and one for
connections that are in TIME-WAIT. This greatly speeds up the fast
timeout processing for sending delayed ACKs.
* TCP now provides proper feedback to the application when a
connection has been successfully set up.
* More comments have been added to the code. The code has also been
somewhat cleaned up.
(0.2) Initial public release.

33
COPYING
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/*
* Copyright (c) 2001, 2002 Swedish Institute of Computer Science.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification,
* are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
* SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
* OF SUCH DAMAGE.
*
* This file is part of the lwIP TCP/IP stack.
*
* Author: Adam Dunkels <adam@sics.se>
*
*/

5
FILES
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src/ - The source code for the lwIP TCP/IP stack.
proj/ - Makefiles and code for compiling lwIP.
See also the FILES file in each subdirectory.

56
README
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lwIP is a small independent implementation of the TCP/IP protocol
suite that has been developed by Adam Dunkels at the Computer and
Networks Architectures (CNA) lab at the Swedish Institute of Computer
Science (SICS).
The focus of the lwIP TCP/IP implementation is to reduce the RAM usage
while still having a full scale TCP. This making lwIP suitable for use
in embedded systems with tenths of kilobytes of free RAM and room for
around 40 kilobytes of code ROM.
lwIP features:
* IP (Internet Protocol) including packet forwarding over multiple
network interfaces
* ICMP (Internet Control Message Protocol) for network maintenance
and debugging
* UDP (User Datagram Protocol) including experimental UDP-lite
extensions
* TCP (Transmission Control Protocol) with congestion control, RTT
estimation and fast recovery/fast retransmit
* Specialized API for enhanced performance
* Optional Berkeley socket API
lwIP is freely available under a BSD license.
lwIP has grown into an excellent TCP/IP stack for embedded devices,
and developers using the stack often submit bug fixes, improvements,
and additions to the stack to further increase its usefulness.
Development of lwIP is hosted on Savannah, a central point for
software development, maintenance and distribution. A core team
will improve lwIP by the use of Savannah's interface and CVS.
The current lwIP CVS tree can be checked out by doing:
cvs -d:pserver:anoncvs@subversions.gnu.org:/cvsroot/lwip login
cvs -z3 -d:pserver:anoncvs@subversions.gnu.org:/cvsroot/lwip co lwip
Last night's CVS tar ball can be downloaded from:
http://savannah.gnu.org/cvs.backups/lwip.tar.gz
Submit patches and bugs via the lwIP project page:
http://savannah.nongnu.org/projects/lwip/
Stable releases have not been released yet. For development we
suggest downloading the latest CVS and keeping track of the
lwIP mailing list.
The mailing list (and archives), as well as Adam Dunkels' papers
on lwIP can be found on the official lwIP home page, which is
http://www.sics.se/~adam/lwip/
Reading Adam Dunkels' papers and browsing the mailing list archives
is a good way to become familiar with the design of lwIP.
Adam Dunkels <adam@sics.se>
Leon Woestenberg <leon.woestenberg@gmx.net>