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1 | INTRODUCTION |
2 | ||
3 | lwIP is a small independent implementation of the TCP/IP protocol | |
4 | suite that has been developed by Adam Dunkels at the Computer and | |
5 | Networks Architectures (CNA) lab at the Swedish Institute of Computer | |
6 | Science (SICS). | |
7 | ||
8 | The focus of the lwIP TCP/IP implementation is to reduce the RAM usage | |
9 | while still having a full scale TCP. This making lwIP suitable for use | |
10 | in embedded systems with tens of kilobytes of free RAM and room for | |
11 | around 40 kilobytes of code ROM. | |
12 | ||
13 | FEATURES | |
14 | ||
15 | * IP (Internet Protocol) including packet forwarding over multiple network | |
16 | interfaces | |
17 | * ICMP (Internet Control Message Protocol) for network maintenance and debugging | |
18 | * IGMP (Internet Group Management Protocol) for multicast traffic management | |
19 | * UDP (User Datagram Protocol) including experimental UDP-lite extensions | |
20 | * TCP (Transmission Control Protocol) with congestion control, RTT estimation | |
21 | and fast recovery/fast retransmit | |
22 | * Specialized raw/native API for enhanced performance | |
23 | * Optional Berkeley-like socket API | |
24 | * DNS (Domain names resolver) | |
25 | * SNMP (Simple Network Management Protocol) | |
26 | * DHCP (Dynamic Host Configuration Protocol) | |
27 | * AUTOIP (for IPv4, conform with RFC 3927) | |
28 | * PPP (Point-to-Point Protocol) | |
29 | * ARP (Address Resolution Protocol) for Ethernet | |
30 | ||
31 | LICENSE | |
32 | ||
33 | lwIP is freely available under a BSD license. | |
34 | ||
35 | DEVELOPMENT | |
36 | ||
37 | lwIP has grown into an excellent TCP/IP stack for embedded devices, | |
38 | and developers using the stack often submit bug fixes, improvements, | |
39 | and additions to the stack to further increase its usefulness. | |
40 | ||
41 | Development of lwIP is hosted on Savannah, a central point for | |
42 | software development, maintenance and distribution. Everyone can | |
43 | help improve lwIP by use of Savannah's interface, CVS and the | |
44 | mailing list. A core team of developers will commit changes to the | |
45 | CVS source tree. | |
46 | ||
47 | The lwIP TCP/IP stack is maintained in the 'lwip' CVS module and | |
48 | contributions (such as platform ports) are in the 'contrib' module. | |
49 | ||
50 | See doc/savannah.txt for details on CVS server access for users and | |
51 | developers. | |
52 | ||
53 | Last night's CVS tar ball can be downloaded from: | |
54 | http://savannah.gnu.org/cvs.backups/lwip.tar.gz [CHANGED - NEEDS FIXING] | |
55 | ||
56 | The current CVS trees are web-browsable: | |
57 | http://savannah.nongnu.org/cgi-bin/viewcvs/lwip/lwip/ | |
58 | http://savannah.nongnu.org/cgi-bin/viewcvs/lwip/contrib/ | |
59 | ||
60 | Submit patches and bugs via the lwIP project page: | |
61 | http://savannah.nongnu.org/projects/lwip/ | |
62 | ||
63 | ||
64 | DOCUMENTATION | |
65 | ||
66 | The original out-dated homepage of lwIP and Adam Dunkels' papers on | |
67 | lwIP are at the official lwIP home page: | |
68 | http://www.sics.se/~adam/lwip/ | |
69 | ||
70 | Self documentation of the source code is regularly extracted from the | |
71 | current CVS sources and is available from this web page: | |
72 | http://www.nongnu.org/lwip/ | |
73 | ||
74 | There is now a constantly growin wiki about lwIP at | |
75 | http://lwip.scribblewiki.com/ | |
76 | ||
77 | Also, there are mailing lists you can subscribe at | |
78 | http://savannah.nongnu.org/mail/?group=lwip | |
79 | plus searchable archives: | |
80 | http://lists.nongnu.org/archive/html/lwip-users/ | |
81 | http://lists.nongnu.org/archive/html/lwip-devel/ | |
82 | ||
83 | Reading Adam's papers, the files in docs/, browsing the source code | |
84 | documentation and browsing the mailing list archives is a good way to | |
85 | become familiar with the design of lwIP. | |
86 | ||
87 | Adam Dunkels <adam@sics.se> | |
88 | Leon Woestenberg <leon.woestenberg@gmx.net> | |
89 |