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Lubomir Rintel 3655f788d3 lib/namespace: avoid double-mounting a /sys
This partly reverts 8f0807023d, bringing
back the umount(/sys) attempt.

In a LXC container we're unable to umount the sysfs instance, nor mount
a read-write one. We still are able to create a new read-only instance.

Nevertheless, it still makes sense to attempt the umount() even though
the sysfs is mounted read-only. Otherwise we may end up attempting to
mount a sysfs with the same flags as is already mounted, resulting in
an EBUSY error (meaning "Already mounted").

Perhaps this is not a very likely scenario in real world, but we hit
it in NetworkManager test suite and makes netns_switch() somewhat more
robust. It also fixes the case, when /sys wasn't mounted at all.

Signed-off-by: Lubomir Rintel <lkundrak@v3.sk>
Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
2018-07-27 13:40:12 -07:00
bash-completion tc: bash-completion: add missing 'classid' keyword 2017-12-12 12:11:37 -08:00
bridge bridge: fix typo in hairpin error message 2018-04-09 11:17:50 -07:00
devlink devlink: CTRL_ATTR_FAMILY_ID is a u16 2018-07-23 13:44:36 -07:00
doc/actions doc: drop old ip command documentation 2017-09-29 10:51:02 -07:00
etc/iproute2 iproute2: Add support for a few routing protocols 2018-06-11 11:18:30 -07:00
examples SPDX license identifiers 2017-11-24 12:21:35 -08:00
genl SPDX license identifiers 2017-11-24 12:21:35 -08:00
include uapi: fix tcp.h repair 2018-07-23 13:47:22 -07:00
ip ip/address: fix bracketing in help message 2018-07-27 13:26:21 -07:00
lib lib/namespace: avoid double-mounting a /sys 2018-07-27 13:40:12 -07:00
man man: Fix typos on tc-cbs 2018-07-07 09:57:45 -07:00
misc ss: remove non-functional slabinfo 2018-05-09 13:57:08 -07:00
netem SPDX license identifiers 2017-11-24 12:21:35 -08:00
rdma rdam: uapi update ib_user_verbs.h 2018-07-23 13:49:20 -07:00
schema bridge: add json schema for bridge fdb show 2016-07-20 12:02:02 -07:00
tc tc: Do not use addattr_nest_compat on mqprio and netem 2018-07-19 15:50:07 -07:00
testsuite tests: make sure rand_dev suffix has 6 chars 2018-01-10 08:29:51 -08:00
tipc Merge ../iproute2-next 2018-06-08 10:27:04 -07:00
.gitignore Remove leftovers from removed Latex documentation 2018-02-13 16:43:19 -08:00
COPYING Update address of FSF in license 2008-03-08 13:31:03 -08:00
Makefile Allow to configure /var/run/netns directory 2018-05-23 15:16:53 -07:00
README README: update libdb build dependency information 2018-05-01 19:29:03 -07:00
README.decnet Decnet documentation update 2005-06-13 18:47:56 +00:00
README.devel README: update location of git repositories, remove broken info link 2018-02-13 16:42:51 -08:00
README.distribution README cleanup's 2012-01-03 15:04:55 -08:00
README.iproute2+tc tc, bpf: finalize eBPF support for cls and act front-end 2015-04-10 13:31:19 -07:00
README.lnstat Rename: misc/README.lnstat -> README.lnstat 2004-10-19 20:24:47 +00:00
configure Drop capabilities if not running ip exec vrf with libcap 2018-03-27 11:48:23 -07:00

README

This is a set of utilities for Linux networking.

Information:
    https://wiki.linuxfoundation.org/networking/iproute2

Download:
    http://www.kernel.org/pub/linux/utils/net/iproute2/

Stable version repository:
    git://git.kernel.org/pub/scm/network/iproute2/iproute2.git

Development repository:
    git://git.kernel.org/pub/scm/network/iproute2/iproute2-next.git

How to compile this.
--------------------
1. libdbm

arpd needs to have the berkeleydb development libraries. For Debian
users this is the package with a name like libdbX.X-dev.
DBM_INCLUDE points to the directory with db_185.h which
is the include file used by arpd to get to the old format Berkeley
database routines.  Often this is in the db-devel package.

2. make

The makefile will automatically build a config.mk file which
contains definitions of libraries that may or may not be available
on the system such as: ATM, ELF, MNL, and SELINUX.

3. To make documentation, cd to doc/ directory , then
   look at start of Makefile and set correct values for
   PAGESIZE=a4		, ie: a4 , letter ...	(string)
   PAGESPERPAGE=2	, ie: 1 , 2 ...		(numeric)
   and make there. It assumes, that latex, dvips and psnup
   are in your path.

4. This package includes matching sanitized kernel headers because
   the build environment may not have up to date versions. See Makefile
   if you have special requirements and need to point at different
   kernel include files.

Stephen Hemminger
stephen@networkplumber.org

Alexey Kuznetsov
kuznet@ms2.inr.ac.ru