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mptcp: safety check before fallback

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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>
This commit is contained in:
Matthieu Baerts (NGI0) 2025-02-24 19:11:52 +01:00 • committed by Jakub Kicinski
parent 8668860b0a
commit db75a16813
1 changed files with 2 additions and 0 deletions
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2
net/mptcp/protocol.h
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@ -1199,6 +1199,8 @@ 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);
}