netdev - [PATCH net-next v2 10/13] mptcp: try to push pending data on snd una updates

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

Message-Id: <fddd06ca7375d53a9294efa195856a2439fb106c.1605199807.git.pabeni@redhat.com>
Date:   Thu, 12 Nov 2020 18:45:30 +0100
From:   Paolo Abeni <pabeni@...hat.com>
To:     netdev@...r.kernel.org
Cc:     Eric Dumazet <edumazet@...gle.com>, mptcp@...ts.01.org,
        Jakub Kicinski <kuba@...nel.org>
Subject: [PATCH net-next v2 10/13] mptcp: try to push pending data on snd una updates

After the previous patch we may end-up with unsent data
in the write buffer. If such buffer is full, the writer
will block for unlimited time.

We need to trigger the MPTCP xmit path even for the
subflow rx path, on MPTCP snd_una updates.

Keep things simple and just schedule the work queue if
needed.

Signed-off-by: Paolo Abeni <pabeni@...hat.com>
---
 net/mptcp/protocol.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/net/mptcp/protocol.c b/net/mptcp/protocol.c
index eae457dc7061..86b4b6e2afbc 100644
--- a/net/mptcp/protocol.c
+++ b/net/mptcp/protocol.c
@@ -731,6 +731,7 @@ void mptcp_data_acked(struct sock *sk)
 	mptcp_reset_timer(sk);
 
 	if ((!test_bit(MPTCP_SEND_SPACE, &mptcp_sk(sk)->flags) ||
+	     mptcp_send_head(sk) ||
 	     (inet_sk_state_load(sk) != TCP_ESTABLISHED)))
 		mptcp_schedule_work(sk);
 }
@@ -1835,6 +1836,8 @@ static void mptcp_worker(struct work_struct *work)
 		__mptcp_close_subflow(msk);
 
 	__mptcp_move_skbs(msk);
+	if (mptcp_send_head(sk))
+		mptcp_push_pending(sk, 0);
 
 	if (msk->pm.status)
 		pm_work(msk);
-- 
2.26.2