netdev - [RFC PATCH 0/2] net: introduce per netns packet type chains

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-ID: <cover.1741957452.git.pabeni@redhat.com>
Date: Fri, 14 Mar 2025 14:04:59 +0100
From: Paolo Abeni <pabeni@...hat.com>
To: netdev@...r.kernel.org
Cc: Andrew Lunn <andrew+netdev@...n.ch>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Simon Horman <horms@...nel.org>,
	Jonathan Corbet <corbet@....net>
Subject: [RFC PATCH 0/2] net: introduce per netns packet type chains

The stack uses shared lists between all the network namespace to store
all the packet taps not bound to any device.

As a consequence, creating such taps in any namespace affects the
performances in all the network namespaces.

Patch 1 addresses the issue introducing new per network namespace packet
type chains, while patch 2 try to minimize the impact of such addition.

The hotdata implications are IMHO not trivial ence the RFC tag; I
suspect patch 2 being the most controversial. As such a possible
alternative is also presented.

Any feedback welcome!

Paolo Abeni (2):
  net: introduce per netns packet chains
  net: hotdata optimization for netns ptypes

 .../networking/net_cachelines/net_device.rst  |  2 +
 include/linux/netdevice.h                     |  9 +-
 include/net/hotdata.h                         |  1 -
 include/net/net_namespace.h                   |  3 +
 net/core/dev.c                                | 82 +++++++++++++++----
 net/core/hotdata.c                            |  1 -
 net/core/net-procfs.c                         | 16 ++--
 net/core/net_namespace.c                      |  2 +
 8 files changed, 86 insertions(+), 30 deletions(-)

-- 
2.48.1