From 9c81be0dbc89ccb76ce34c3a88425bf3a0d57ebb Mon Sep 17 00:00:00 2001 From: Geliang Tang Date: Tue, 26 Apr 2022 14:57:14 -0700 Subject: mptcp: add MP_FAIL response support This patch adds a new struct member mp_fail_response_expect in struct mptcp_subflow_context to support MP_FAIL response. In the single subflow with checksum error and contiguous data special case, a MP_FAIL is sent in response to another MP_FAIL. Signed-off-by: Geliang Tang Signed-off-by: Mat Martineau Signed-off-by: David S. Miller --- net/mptcp/pm.c | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-) (limited to 'net/mptcp/pm.c') diff --git a/net/mptcp/pm.c b/net/mptcp/pm.c index 5c36870d3420..971e843a304c 100644 --- a/net/mptcp/pm.c +++ b/net/mptcp/pm.c @@ -290,8 +290,16 @@ void mptcp_pm_mp_fail_received(struct sock *sk, u64 fail_seq) pr_debug("fail_seq=%llu", fail_seq); - if (!mptcp_has_another_subflow(sk) && READ_ONCE(msk->allow_infinite_fallback)) + if (mptcp_has_another_subflow(sk) || !READ_ONCE(msk->allow_infinite_fallback)) + return; + + if (!READ_ONCE(subflow->mp_fail_response_expect)) { + pr_debug("send MP_FAIL response and infinite map"); + + subflow->send_mp_fail = 1; + MPTCP_INC_STATS(sock_net(sk), MPTCP_MIB_MPFAILTX); subflow->send_infinite_map = 1; + } } /* path manager helpers */ -- cgit v1.2.3