diff options
Diffstat (limited to 'target/linux/etrax-2.6/image/e100boot/src/libpcap-0.4/README')
| -rw-r--r-- | target/linux/etrax-2.6/image/e100boot/src/libpcap-0.4/README | 49 |
1 files changed, 49 insertions, 0 deletions
diff --git a/target/linux/etrax-2.6/image/e100boot/src/libpcap-0.4/README b/target/linux/etrax-2.6/image/e100boot/src/libpcap-0.4/README new file mode 100644 index 0000000000..67fce85da2 --- /dev/null +++ b/target/linux/etrax-2.6/image/e100boot/src/libpcap-0.4/README @@ -0,0 +1,49 @@ +@(#) $Header: /usr/local/cvs/linux/tools/build/e100boot/libpcap-0.4/README,v 1.1 1999/08/26 10:05:19 johana Exp $ (LBL) + +LIBPCAP 0.4 +Lawrence Berkeley National Laboratory +Network Research Group +libpcap@ee.lbl.gov +ftp://ftp.ee.lbl.gov/libpcap.tar.Z + +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. + +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 is in: + + ftp://ftp.ee.lbl.gov/papers/bpf-usenix93.ps.Z. + +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/386, NetBSD, and FreeBSD. DEC OSF/1 +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. + +Problems, bugs, questions, desirable enhancements, source code +contributions, etc., should be sent to the email address +"libpcap@ee.lbl.gov". + + - Steve McCanne + Craig Leres + Van Jacobson |