Beyond Linux® From Scratch (systemd Edition) - Version 11.3

Chapter 17. Networking Libraries

libnl-3.7.0

Introduction to libnl

The libnl suite is a collection of libraries providing APIs to netlink protocol based Linux kernel interfaces.

This package is known to build and work properly using an LFS 11.3 platform.

Package Information

Optional Download

User Notes: https://wiki.linuxfromscratch.org/blfs/wiki/libnl

Installation of libnl

Install libnl by running the following commands: 

./configure --prefix=/usr     \
            --sysconfdir=/etc \
            --disable-static  &&
make

This package does not come with a working test suite.

Now, as the root user: 

make install

If you wish to install the API documentation, as the root user: 

mkdir -vp /usr/share/doc/libnl-3.7.0 &&
tar -xf ../libnl-doc-3.7.0.tar.gz --strip-components=1 --no-same-owner \
    -C  /usr/share/doc/libnl-3.7.0

Command Explanations

--disable-static: This switch prevents installation of static versions of the libraries.

--disable-cli: Use this parameter if you don't want to install cli tools provided by the package.

Contents

Installed Programs: genl-ctrl-list, idiag-socket-details, nl-class-add, nl-class-delete, nl-classid-lookup, nl-class-list, nl-cls-add, nl-cls-delete, nl-cls-list, nl-link-list, nl-pktloc-lookup, nl-qdisc-add, nl-qdisc-delete, nl-qdisc-list, and 48 other helper programs with nl- and nf- prefixes
Installed Libraries: libnl-3.so, libnl-cli-3.so, libnl-genl-3.so, libnl-idiag-3.so, libnl-nf-3.so, libnl-route-3.so, libnl-xfrm-3.so, and cli modules under /usr/lib/libnl/cli tree
Installed Directories: /etc/libnl, /usr/include/libnl3, /usr/lib/libnl, and /usr/share/doc/libnl-3.7.0

Short Descriptions

genl-ctrl-list

queries the Generic Netlink controller in the kernel and prints a list of all registered Generic Netlink families including the version of the interface that has been registered

nl-class-add

adds, updates, or replaces Traffic Classes

nl-class-delete

deletes Traffic Classes

nl-classid-lookup

is used to resolve qdisc/class names to classid values and vice versa

nl-class-list

lists Traffic Classes

nl-cls-add

adds a classifier

nl-cls-delete

deletes a classifier

nl-cls-list

lists classifiers

nl-link-list

dumps link attributes

nl-pktloc-lookup

allows the lookup of packet location definitions

nl-qdisc-add

adds queueing disciplines (qdiscs) in the kernel

nl-qdisc-delete

deletes queueing disciplines (qdiscs) in the kernel

nl-qdisc-list

lists queueing disciplines (qdiscs) in the kernel

libnl*-3.so

These libraries contain API functions used to access Netlink interfaces in Linux kernel