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Message-ID: <20241107133004.7469-1-shaw.leon@gmail.com>
Date: Thu, 7 Nov 2024 21:29:55 +0800
From: Xiao Liang <shaw.leon@...il.com>
To: netdev@...r.kernel.org,
linux-kselftest@...r.kernel.org,
Kuniyuki Iwashima <kuniyu@...zon.com>,
Jakub Kicinski <kuba@...nel.org>
Cc: "David S. Miller" <davem@...emloft.net>,
David Ahern <dsahern@...nel.org>,
Eric Dumazet <edumazet@...gle.com>,
Paolo Abeni <pabeni@...hat.com>,
Ido Schimmel <idosch@...dia.com>,
Andrew Lunn <andrew+netdev@...n.ch>,
Simon Horman <horms@...nel.org>,
Donald Hunter <donald.hunter@...il.com>,
Shuah Khan <shuah@...nel.org>,
Jiri Pirko <jiri@...nulli.us>,
Hangbin Liu <liuhangbin@...il.com>
Subject: [PATCH net-next v2 0/8] net: Improve netns handling in RTNL and ip_tunnel
This patch series includes some netns-related improvements and fixes for
RTNL and ip_tunnel, to make link creation more intuitive:
- Creating link in another net namespace doesn't conflict with link names
in current one.
- Add a flag in rtnl_ops, to avoid netns change when link-netns is present
if possible.
- When creating ip tunnel (e.g. GRE) in another netns, use current as
link-netns if not specified explicitly.
So that
# modprobe ip_gre netns_atomic=1
# ip link add netns ns1 link-netns ns2 tun0 type gre ...
will create tun0 in ns1, rather than create it in ns2 and move to ns1.
And don't conflict with another interface named "tun0" in current netns.
---
v2:
- Check NLM_F_EXCL to ensure only link creation is affected.
- Add self tests for link name/ifindex conflict and notifications
in different netns.
- Changes in dummy driver and ynl in order to add the test case.
v1:
link: https://lore.kernel.org/all/20241023023146.372653-1-shaw.leon@gmail.com/
Xiao Liang (8):
rtnetlink: Lookup device in target netns when creating link
rtnetlink: Add netns_atomic flag in rtnl_link_ops
net: ip_tunnel: Build flow in underlay net namespace
net: ip_tunnel: Add source netns support for newlink
net: ip_gre: Add netns_atomic module parameter
net: dummy: Set netns_atomic in rtnl ops for testing
tools/net/ynl: Add retry limit for async notification
selftests: net: Add two test cases for link netns
drivers/net/dummy.c | 1 +
include/net/ip_tunnels.h | 3 ++
include/net/rtnetlink.h | 3 ++
net/core/rtnetlink.c | 17 +++++--
net/ipv4/ip_gre.c | 15 +++++-
net/ipv4/ip_tunnel.c | 27 +++++++----
tools/net/ynl/lib/ynl.py | 7 ++-
tools/testing/selftests/net/Makefile | 1 +
tools/testing/selftests/net/netns-name.sh | 10 ++++
tools/testing/selftests/net/netns_atomic.py | 54 +++++++++++++++++++++
10 files changed, 121 insertions(+), 17 deletions(-)
create mode 100755 tools/testing/selftests/net/netns_atomic.py
--
2.47.0
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