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Lahav Schlesinger f760bff328 ipmonitor: Fix recvmsg with ancillary data 
A successful call to recvmsg() causes msg.msg_controllen to contain the length
of the received ancillary data. However, the current code in the 'ip' utility
doesn't reset this value after each recvmsg().

This means that if a call to recvmsg() doesn't have ancillary data, then
'msg.msg_controllen' will be set to 0, causing future recvmsg() which do
contain ancillary data to get MSG_CTRUNC set in msg.msg_flags.

This fixes 'ip monitor' running with the all-nsid option - With this option the
kernel passes the nsid as ancillary data. If while 'ip monitor' is running an
even on the current netns is received, then no ancillary data will be sent,
causing 'msg.msg_controllen' to be set to 0, which causes 'ip monitor' to
indefinitely print "[nsid current]" instead of the real nsid.

Fixes: 449b824ad1 ("ipmonitor: allows to monitor in several netns")
Cc: Nicolas Dichtel <nicolas.dichtel@6wind.com>
Signed-off-by: Lahav Schlesinger <lschlesinger@drivenets.com>
Acked-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>
Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
 		2021-07-17 11:13:36 -07:00
bash-completion devlink: add support for port params get/set 2021-02-11 09:21:24 -07:00
bridge bridge: vlan: dump port only if there are any vlans 2021-04-26 02:32:46 +00:00
dcb dcb: fix memory leak 2021-05-06 14:48:02 +00:00
devlink Merge branch 'main' into next 2021-07-01 14:29:42 +00:00
doc/actions doc: remove trailing whitespace 2018-12-19 12:02:38 -08:00
etc/iproute2 Add Open/R to rt_protos 2021-03-30 03:04:09 +00:00
examples/bpf examples/bpf: add bpf examples with BTF defined maps 2020-11-24 22:14:08 -07:00
genl genl: ctrl: print op -> policy idx mapping 2020-10-11 20:10:09 -06:00
include uapi: headers update 2021-07-17 11:12:47 -07:00
ip ip route: ignore ENOENT during save if RT_TABLE_MAIN is being dumped 2021-07-07 07:32:56 -07:00
lib ipmonitor: Fix recvmsg with ancillary data 2021-07-17 11:13:36 -07:00
man man8/ip-tunnel.8: fix typo, 'encaplim' is not a valid option 2021-07-15 09:31:51 -07:00
misc Merge git://git.kernel.org/pub/scm/network/iproute2/iproute2-next 2021-02-23 23:03:42 -08:00
netem doc: remove trailing whitespace 2018-12-19 12:02:38 -08:00
rdma rdma: Add copy-on-fork to get sys command 2021-05-03 14:43:13 +00:00
schema bridge: add json schema for bridge fdb show 2016-07-20 12:02:02 -07:00
tc tc: pedit: add decrement operation 2021-06-26 04:45:19 +00:00
testsuite testsuite: Add mpls packet matching tests for tc flower 2020-12-16 04:14:26 +00:00
tipc tipc: bail out if key is abnormally long 2021-05-09 22:08:47 +00:00
vdpa vdpa: add .gitignore 2021-02-23 23:12:14 -08:00
.clang-format clang-format: add configuration file 2019-01-17 13:38:23 -08:00
.gitignore Remove leftovers from removed Latex documentation 2018-02-13 16:43:19 -08:00
.mailmap mailmap: map David's mail address 2019-05-15 09:50:42 -07:00
COPYING Update address of FSF in license 2008-03-08 13:31:03 -08:00
Makefile config.mk: Rerun configure when it is newer than config.mk 2021-05-17 02:13:56 +00:00
README README: remove doc instructions 2021-03-20 09:29:02 -07:00
README.devel README: update location of git repositories, remove broken info link 2018-02-13 16:42:51 -08:00
configure configure: convert LIBBPF environment variables to command-line options 2021-06-03 03:25:59 +00:00

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. include/uapi

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