freebsd-dev/contrib/libpcap
Christian S.J. Peron 154bbe416c Implement zero-copy bpf(4) buffer or "zbuf" support for libpcap. A slightly
different version has been committed upstream in the libpcap vendor branch.
This will allow people to experiment with zero-copy bpf(4) without requiring
external patches.

Note to enable this functionality:

    sysctl net.bpf.zerocopy_enable=1

By default, libpcap will use the legacy buffering method unless this sysctl
variable is set to 1.

For the details about zero-copy bpf(4) implementation see svn change r177548.

Requested by:		many
Discussed with:		sam
In collaboration with:	rwatson
2008-09-16 20:32:29 +00:00
..
bpf/net Virgin import of libpcap v0.9.1 (alpha 096) from tcpdump.org 2005-05-29 17:46:52 +00:00
doc Import of libpcap v0.9.4 2006-09-04 19:43:23 +00:00
lbl Resolve merge conflicts 2007-10-16 02:07:55 +00:00
packaging This commit was generated by cvs2svn to compensate for changes in r172677, 2007-10-16 02:02:02 +00:00
.cvsignore Import libpcap 0.8.3, from http://www.tcpdump.org/releases/libpcap-0.8.3.tar.gz 2004-03-31 09:07:39 +00:00
acconfig.h
acsite.m4
arcnet.h
atmuni31.h Import libpcap 0.8.3, from http://www.tcpdump.org/releases/libpcap-0.8.3.tar.gz 2004-03-31 09:07:39 +00:00
bpf_dump.c Virgin import of libpcap v0.9.1 (alpha 096) from tcpdump.org 2005-05-29 17:46:52 +00:00
bpf_image.c Import of libpcap v0.9.8 2007-10-16 02:02:02 +00:00
CHANGES Import of libpcap v0.9.8 2007-10-16 02:02:02 +00:00
config.guess Import libpcap 0.8.3, from http://www.tcpdump.org/releases/libpcap-0.8.3.tar.gz 2004-03-31 09:07:39 +00:00
config.h.in Import of libpcap v0.9.8 2007-10-16 02:02:02 +00:00
config.sub Import libpcap 0.8.3, from http://www.tcpdump.org/releases/libpcap-0.8.3.tar.gz 2004-03-31 09:07:39 +00:00
configure Import of libpcap v0.9.8 2007-10-16 02:02:02 +00:00
configure.in Import of libpcap v0.9.8 2007-10-16 02:02:02 +00:00
CREDITS Import of libpcap v0.9.8 2007-10-16 02:02:02 +00:00
etherent.c Virgin import of libpcap v0.9.1 (alpha 096) from tcpdump.org 2005-05-29 17:46:52 +00:00
ethertype.h Import of libpcap v0.9.4 2006-09-04 19:43:23 +00:00
fad-getad.c Import of libpcap v0.9.8 2007-10-16 02:02:02 +00:00
fad-gifc.c Virgin import of libpcap v0.9.1 (release) from tcpdump.org 2005-07-11 03:24:53 +00:00
fad-glifc.c Virgin import of libpcap v0.9.1 (release) from tcpdump.org 2005-07-11 03:24:53 +00:00
fad-null.c Virgin import of libpcap v0.9.1 (alpha 096) from tcpdump.org 2005-05-29 17:46:52 +00:00
fad-win32.c Import of libpcap v0.9.8 2007-10-16 02:02:02 +00:00
FILES Import of libpcap v0.9.8 2007-10-16 02:02:02 +00:00
FREEBSD-upgrade update instructions 2006-09-04 19:54:49 +00:00
gencode.c Resolve merge conflicts 2007-10-16 02:07:55 +00:00
gencode.h Resolve merge conflicts 2007-10-16 02:07:55 +00:00
grammar.y Resolve merge conflicts 2007-10-16 02:07:55 +00:00
inet.c Import of libpcap v0.9.8 2007-10-16 02:02:02 +00:00
install-sh
INSTALL.txt Import of libpcap v0.9.8 2007-10-16 02:02:02 +00:00
LICENSE
llc.h
Makefile.in Import of libpcap v0.9.8 2007-10-16 02:02:02 +00:00
mkdep
nametoaddr.c Resolve merge conflicts 2007-10-16 02:07:55 +00:00
nlpid.h Merge of libpcap 0.8.3 from tcpdump.org. 2004-03-31 09:15:09 +00:00
optimize.c Import of libpcap v0.9.8 2007-10-16 02:02:02 +00:00
pcap1.h Virgin import of libpcap v0.9.1 (alpha 096) from tcpdump.org 2005-05-29 17:46:52 +00:00
pcap-bpf.c Implement zero-copy bpf(4) buffer or "zbuf" support for libpcap. A slightly 2008-09-16 20:32:29 +00:00
pcap-bpf.h Import of libpcap v0.9.8 2007-10-16 02:02:02 +00:00
pcap-dag.c Import of libpcap v0.9.8 2007-10-16 02:02:02 +00:00
pcap-dag.h Import of libpcap v0.9.4 2006-09-04 19:43:23 +00:00
pcap-dlpi.c Import of libpcap v0.9.8 2007-10-16 02:02:02 +00:00
pcap-dos.c Virgin import of libpcap v0.9.1 (release) from tcpdump.org 2005-07-11 03:24:53 +00:00
pcap-dos.h Virgin import of libpcap v0.9.1 (alpha 096) from tcpdump.org 2005-05-29 17:46:52 +00:00
pcap-enet.c Virgin import of libpcap v0.9.1 (alpha 096) from tcpdump.org 2005-05-29 17:46:52 +00:00
pcap-int.h Implement zero-copy bpf(4) buffer or "zbuf" support for libpcap. A slightly 2008-09-16 20:32:29 +00:00
pcap-linux.c Import of libpcap v0.9.8 2007-10-16 02:02:02 +00:00
pcap-namedb.h resolve merge conflicts 2005-07-11 03:43:25 +00:00
pcap-nit.c Virgin import of libpcap v0.9.1 (release) from tcpdump.org 2005-07-11 03:24:53 +00:00
pcap-nit.h
pcap-null.c Virgin import of libpcap v0.9.1 (alpha 096) from tcpdump.org 2005-05-29 17:46:52 +00:00
pcap-pf.c Virgin import of libpcap v0.9.1 (release) from tcpdump.org 2005-07-11 03:24:53 +00:00
pcap-pf.h
pcap-septel.c Virgin import of libpcap v0.9.1 (release) from tcpdump.org 2005-07-11 03:24:53 +00:00
pcap-septel.h Virgin import of libpcap v0.9.1 (release) from tcpdump.org 2005-07-11 03:24:53 +00:00
pcap-snit.c Virgin import of libpcap v0.9.1 (release) from tcpdump.org 2005-07-11 03:24:53 +00:00
pcap-snoop.c Virgin import of libpcap v0.9.1 (release) from tcpdump.org 2005-07-11 03:24:53 +00:00
pcap-stdinc.h Import of libpcap v0.9.4 2006-09-04 19:43:23 +00:00
pcap-win32.c Import of libpcap v0.9.8 2007-10-16 02:02:02 +00:00
pcap.3 Resolve merge conflicts 2007-10-16 02:07:55 +00:00
pcap.c Implement zero-copy bpf(4) buffer or "zbuf" support for libpcap. A slightly 2008-09-16 20:32:29 +00:00
pcap.h Revert back to including the whole net/bpf.h again. 2007-10-20 20:23:39 +00:00
ppp.h Virgin import of libpcap v0.9.1 (alpha 096) from tcpdump.org 2005-05-29 17:46:52 +00:00
README Virgin import of libpcap v0.9.1 (alpha 096) from tcpdump.org 2005-05-29 17:46:52 +00:00
README.aix Import libpcap 0.8.3, from http://www.tcpdump.org/releases/libpcap-0.8.3.tar.gz 2004-03-31 09:07:39 +00:00
README.dag Import of libpcap v0.9.8 2007-10-16 02:02:02 +00:00
README.hpux Virgin import of libpcap v0.9.1 (alpha 096) from tcpdump.org 2005-05-29 17:46:52 +00:00
README.linux
README.macosx Virgin import of libpcap v0.9.1 (alpha 096) from tcpdump.org 2005-05-29 17:46:52 +00:00
README.septel Virgin import of libpcap v0.9.1 (release) from tcpdump.org 2005-07-11 03:24:53 +00:00
README.tru64
README.Win32 Import libpcap 0.8.3, from http://www.tcpdump.org/releases/libpcap-0.8.3.tar.gz 2004-03-31 09:07:39 +00:00
savefile.c Import of libpcap v0.9.8 2007-10-16 02:02:02 +00:00
scanner.l Resolve merge conflicts 2007-10-16 02:07:55 +00:00
sll.h Import libpcap 0.8.3, from http://www.tcpdump.org/releases/libpcap-0.8.3.tar.gz 2004-03-31 09:07:39 +00:00
sunatmpos.h Import libpcap 0.8.3, from http://www.tcpdump.org/releases/libpcap-0.8.3.tar.gz 2004-03-31 09:07:39 +00:00
TODO Import of libpcap v0.9.8 2007-10-16 02:02:02 +00:00
VERSION Import of libpcap v0.9.8 2007-10-16 02:02:02 +00:00

@(#) $Header: /tcpdump/master/libpcap/README,v 1.30 2004/10/12 02:02:28 guy Exp $ (LBL)

LIBPCAP 0.9
Now maintained by "The Tcpdump Group"
See 		www.tcpdump.org

Please send inquiries/comments/reports to 	tcpdump-workers@tcpdump.org

Anonymous CVS is available via:
	cvs -d :pserver:tcpdump@cvs.tcpdump.org:/tcpdump/master login
	(password "anoncvs")
	cvs -d :pserver:tcpdump@cvs.tcpdump.org:/tcpdump/master checkout libpcap

Version 0.9 of LIBPCAP can be retrieved with the CVS tag "libpcap_0_9rel1":
	cvs -d :pserver:tcpdump@cvs.tcpdump.org:/tcpdump/master checkout -r libpcap_0_9rel1 libpcap

Please send patches against the master copy to patches@tcpdump.org.

formerly from 	Lawrence Berkeley National Laboratory
		Network Research Group <libpcap@ee.lbl.gov>
		ftp://ftp.ee.lbl.gov/libpcap.tar.Z (0.4)

This directory contains source code for libpcap, a system-independent
interface for user-level packet capture.  libpcap provides a portable
framework for low-level network monitoring.  Applications include
network statistics collection, security monitoring, network debugging,
etc.  Since almost every system vendor provides a different interface
for packet capture, and since we've developed several tools that
require this functionality, we've created this system-independent API
to ease in porting and to alleviate the need for several
system-dependent packet capture modules in each application.

Note well: this interface is new and is likely to change.

For some platforms there are README.{system} files that discuss issues
with the OS's interface for packet capture on those platforms, such as
how to enable support for that interface in the OS, if it's not built in
by default.

The libpcap interface supports a filtering mechanism based on the
architecture in the BSD packet filter.  BPF is described in the 1993
Winter Usenix paper ``The BSD Packet Filter: A New Architecture for
User-level Packet Capture''.  A compressed PostScript version can be
found at

	ftp://ftp.ee.lbl.gov/papers/bpf-usenix93.ps.Z

or

	http://www.tcpdump.org/papers/bpf-usenix93.ps.Z

and a gzipped version can be found at

	http://www.tcpdump.org/papers/bpf-usenix93.ps.gz

A PDF version can be found at

	http://www.tcpdump.org/papers/bpf-usenix93.pdf

Although most packet capture interfaces support in-kernel filtering,
libpcap utilizes in-kernel filtering only for the BPF interface.
On systems that don't have BPF, all packets are read into user-space
and the BPF filters are evaluated in the libpcap library, incurring
added overhead (especially, for selective filters).  Ideally, libpcap
would translate BPF filters into a filter program that is compatible
with the underlying kernel subsystem, but this is not yet implemented.

BPF is standard in 4.4BSD, BSD/OS, NetBSD, FreeBSD, and OpenBSD.  DEC
OSF/1/Digital UNIX/Tru64 UNIX uses the packetfilter interface but has
been extended to accept BPF filters (which libpcap utilizes).  Also, you
can add BPF filter support to Ultrix using the kernel source and/or
object patches available in:

	ftp://gatekeeper.dec.com/pub/DEC/net/bpfext42.tar.Z.

Linux, in the 2.2 kernel and later kernels, has a "Socket Filter"
mechanism that accepts BPF filters; see the README.linux file for
information on configuring that option.

Problems, bugs, questions, desirable enhancements, etc. should be sent
to the address "tcpdump-workers@tcpdump.org".  Bugs, support requests,
and feature requests may also be submitted on the SourceForge site for
libpcap at

	http://sourceforge.net/projects/libpcap/

Source code contributions, etc. should be sent to the email address
"patches@tcpdump.org", or submitted as patches on the SourceForge site
for libpcap.

Current versions can be found at www.tcpdump.org, or the SourceForge
site for libpcap.

 - The TCPdump team