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mptcp: safety check before fallback

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[ Upstream commit db75a16813aabae3b78c06b1b99f5e314c1f55d3 ]

Recently, some fallback have been initiated, while the connection was
not supposed to fallback.

Add a safety check with a warning to detect when an wrong attempt to
fallback is being done. This should help detecting any future issues
quicker.

Acked-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Matthieu Baerts (NGI0) <matttbe@kernel.org>
Link: https://patch.msgid.link/20250224-net-mptcp-misc-fixes-v1-3-f550f636b435@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Matthieu Baerts (NGI0)
2025-02-24 19:11:52 +01:00
committed by Greg Kroah-Hartman
parent 452382b273
commit 3c6e077b2a
1 changed files with 2 additions and 0 deletions
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2
net/mptcp/protocol.h
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@@ -981,6 +981,8 @@ static inline void __mptcp_do_fallback(struct mptcp_sock *msk)
pr_debug("TCP fallback already done (msk=%p)\n", msk);
return;
}
if (WARN_ON_ONCE(!READ_ONCE(msk->allow_infinite_fallback)))
return;
set_bit(MPTCP_FALLBACK_DONE, &msk->flags);
}