mptcp: send out MP_FAIL when data checksum fails

When a bad checksum is detected, set the send_mp_fail flag to send out the MP_FAIL option. Add a new function mptcp_has_another_subflow() to check whether there's only a single subflow. When multiple subflows are in use, close the affected subflow with a RST that includes an MP_FAIL option and discard the data with the bad checksum. Set the sk_state of the subsocket to TCP_CLOSE, then the flag MPTCP_WORK_CLOSE_SUBFLOW will be set in subflow_sched_work_if_closed, and the subflow will be closed. When a single subfow is in use, temporarily handled by sending MP_FAIL with a RST too. Reviewed-by: Mat Martineau <[email protected]> Signed-off-by: Geliang Tang <[email protected]>
multipath-tcp · Aug 4, 2021 · cce924a · cce924a
1 parent 0277f2a
commit cce924a
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diff --git a/net/mptcp/protocol.h b/net/mptcp/protocol.h
@@ -614,6 +614,19 @@ static inline void mptcp_subflow_tcp_fallback(struct sock *sk,
 	inet_csk(sk)->icsk_af_ops = ctx->icsk_af_ops;
 }
 
+static inline bool mptcp_has_another_subflow(struct sock *ssk)
+{
+	struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(ssk), *tmp;
+	struct mptcp_sock *msk = mptcp_sk(subflow->conn);
+
+	mptcp_for_each_subflow(msk, tmp) {
+		if (tmp != subflow)
+			return true;
+	}
+
+	return false;
+}
+
 void __init mptcp_proto_init(void);
 #if IS_ENABLED(CONFIG_MPTCP_IPV6)
 int __init mptcp_proto_v6_init(void);

diff --git a/net/mptcp/subflow.c b/net/mptcp/subflow.c
@@ -910,6 +910,7 @@ static enum mapping_status validate_data_csum(struct sock *ssk, struct sk_buff *
 	csum = csum_partial(&header, sizeof(header), subflow->map_data_csum);
 	if (unlikely(csum_fold(csum))) {
 		MPTCP_INC_STATS(sock_net(ssk), MPTCP_MIB_DATACSUMERR);
+		subflow->send_mp_fail = 1;
 		return subflow->mp_join ? MAPPING_INVALID : MAPPING_DUMMY;
 	}
 
@@ -1157,6 +1158,20 @@ static bool subflow_check_data_avail(struct sock *ssk)
 
 fallback:
 	/* RFC 8684 section 3.7. */
+	if (subflow->send_mp_fail) {
+		if (mptcp_has_another_subflow(ssk)) {
+			while ((skb = skb_peek(&ssk->sk_receive_queue)))
+				sk_eat_skb(ssk, skb);
+		}
+		ssk->sk_err = EBADMSG;
+		tcp_set_state(ssk, TCP_CLOSE);
+		subflow->reset_transient = 0;
+		subflow->reset_reason = MPTCP_RST_EMIDDLEBOX;
+		tcp_send_active_reset(ssk, GFP_ATOMIC);
+		WRITE_ONCE(subflow->data_avail, 0);
+		return true;
+	}
+
 	if (subflow->mp_join || subflow->fully_established) {
 		/* fatal protocol error, close the socket.
 		 * subflow_error_report() will introduce the appropriate barriers