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Message-Id: <cover.1721733730.git.jchapman@katalix.com>
Date: Tue, 23 Jul 2024 14:51:28 +0100
From: James Chapman <jchapman@...alix.com>
To: netdev@...r.kernel.org
Cc: davem@...emloft.net,
edumazet@...gle.com,
kuba@...nel.org,
pabeni@...hat.com,
dsahern@...nel.org,
tparkin@...alix.com
Subject: [RFC PATCH 00/15] l2tp: simplify tunnel and session cleanup
This series simplifies and improves l2tp tunnel and session cleanup.
* refactor l2tp management code to not use the tunnel socket's
sk_user_data. This allows the tunnel and its socket to be closed
and freed without sequencing the two using the socket's sk_destruct
hook.
* export ip_flush_pending_frames and use it when closing l2tp_ip
sockets.
* move the work of closing all sessions in the tunnel to the work
queue so that sessions are deleted using the same codepath whether
they are closed by user API request or their parent tunnel is
closing.
* refactor l2tp_ppp to have session lifetimes managed by the
session's refcount such that the session holds a ref on its pppox
socket while it references it. Previously the pppox socket held a
ref on the session, which complicated session delete by having to
go through the socket destructor.
* free sessions and pppox sockets by rcu.
* fix a possible tunnel refcount underflow.
* avoid using rcu_barrier in net exit handler.
James Chapman (15):
l2tp: lookup tunnel from socket without using sk_user_data
ipv4: export ip_flush_pending_frames
l2tp: have l2tp_ip_destroy_sock use ip_flush_pending_frames
l2tp: don't use tunnel socket sk_user_data in ppp procfs output
l2tp: don't set sk_user_data in tunnel socket
l2tp: remove unused tunnel magic field
l2tp: simplify tunnel and socket cleanup
l2tp: delete sessions using work queue
l2tp: free sessions using rcu
l2tp: refactor ppp socket/session relationship
l2tp: prevent possible tunnel refcount underflow
l2tp: use rcu list add/del when updating lists
l2tp: add idr consistency check in session_register
l2tp: cleanup eth/ppp pseudowire setup code
l2tp: use pre_exit pernet hook to avoid rcu_barrier
net/ipv4/ip_output.c | 1 +
net/l2tp/l2tp_core.c | 199 ++++++++++++++++++++++------------------
net/l2tp/l2tp_core.h | 14 +--
net/l2tp/l2tp_eth.c | 2 +-
net/l2tp/l2tp_ip.c | 13 ++-
net/l2tp/l2tp_ip6.c | 7 +-
net/l2tp/l2tp_netlink.c | 4 +-
net/l2tp/l2tp_ppp.c | 107 ++++++++++-----------
8 files changed, 179 insertions(+), 168 deletions(-)
--
2.34.1
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