2016-09-18 01:03:25 +00:00
|
|
|
INTRODUCTION
|
|
|
|
|
|
|
|
|
|
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 tens of kilobytes of free RAM and room for
|
|
|
|
|
around 40 kilobytes of code ROM.
|
|
|
|
|
|
|
|
|
|
FEATURES
|
|
|
|
|
|
|
|
|
|
* IP (Internet Protocol) including packet forwarding over multiple network
|
|
|
|
|
interfaces
|
|
|
|
|
* ICMP (Internet Control Message Protocol) for network maintenance and debugging
|
|
|
|
|
* IGMP (Internet Group Management Protocol) for multicast traffic management
|
|
|
|
|
* UDP (User Datagram Protocol) including experimental UDP-lite extensions
|
|
|
|
|
* TCP (Transmission Control Protocol) with congestion control, RTT estimation
|
|
|
|
|
and fast recovery/fast retransmit
|
|
|
|
|
* Specialized raw/native API for enhanced performance
|
|
|
|
|
* Optional Berkeley-like socket API
|
|
|
|
|
* DNS (Domain names resolver)
|
|
|
|
|
* SNMP (Simple Network Management Protocol)
|
|
|
|
|
* DHCP (Dynamic Host Configuration Protocol)
|
|
|
|
|
* AUTOIP (for IPv4, conform with RFC 3927)
|
|
|
|
|
* PPP (Point-to-Point Protocol)
|
|
|
|
|
* ARP (Address Resolution Protocol) for Ethernet
|
|
|
|
|
|
|
|
|
|
LICENSE
|
|
|
|
|
|
|
|
|
|
lwIP is freely available under a BSD license.
|
|
|
|
|
|
|
|
|
|
DEVELOPMENT
|
|
|
|
|
|
|
|
|
|
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. Everyone can
|
|
|
|
|
help improve lwIP by use of Savannah's interface, CVS and the
|
|
|
|
|
mailing list. A core team of developers will commit changes to the
|
|
|
|
|
CVS source tree.
|
|
|
|
|
|
|
|
|
|
The lwIP TCP/IP stack is maintained in the 'lwip' CVS module and
|
|
|
|
|
contributions (such as platform ports) are in the 'contrib' module.
|
|
|
|
|
|
|
|
|
|
See doc/savannah.txt for details on CVS server access for users and
|
|
|
|
|
developers.
|
|
|
|
|
|
|
|
|
|
Last night's CVS tar ball can be downloaded from:
|
|
|
|
|
http://savannah.gnu.org/cvs.backups/lwip.tar.gz [CHANGED - NEEDS FIXING]
|
|
|
|
|
|
|
|
|
|
The current CVS trees are web-browsable:
|
|
|
|
|
http://savannah.nongnu.org/cgi-bin/viewcvs/lwip/lwip/
|
|
|
|
|
http://savannah.nongnu.org/cgi-bin/viewcvs/lwip/contrib/
|
|
|
|
|
|
|
|
|
|
Submit patches and bugs via the lwIP project page:
|
|
|
|
|
http://savannah.nongnu.org/projects/lwip/
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
DOCUMENTATION
|
|
|
|
|
|
|
|
|
|
The original out-dated homepage of lwIP and Adam Dunkels' papers on
|
|
|
|
|
lwIP are at the official lwIP home page:
|
|
|
|
|
http://www.sics.se/~adam/lwip/
|
|
|
|
|
|
|
|
|
|
Self documentation of the source code is regularly extracted from the
|
|
|
|
|
current CVS sources and is available from this web page:
|
|
|
|
|
http://www.nongnu.org/lwip/
|
|
|
|
|
|
|
|
|
|
There is now a constantly growin wiki about lwIP at
|
|
|
|
|
http://lwip.wikia.com/wiki/LwIP_Wiki
|
|
|
|
|
|
|
|
|
|
Also, there are mailing lists you can subscribe at
|
|
|
|
|
http://savannah.nongnu.org/mail/?group=lwip
|
|
|
|
|
plus searchable archives:
|
|
|
|
|
http://lists.nongnu.org/archive/html/lwip-users/
|
|
|
|
|
http://lists.nongnu.org/archive/html/lwip-devel/
|
|
|
|
|
|
|
|
|
|
Reading Adam's papers, the files in docs/, browsing the source code
|
|
|
|
|
documentation 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>
|
|
|
|
|
|
