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Date:   Mon, 11 Mar 2019 20:09:36 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     netdev@...r.kernel.org
CC:     marcelo.leitner@...il.com, lucien.xin@...il.com,
        nhorman@...driver.com
Subject: [PATCH RFC v4 4/5] sctp: Make sctp_enqueue_event tak an skb list.


Pass this, instead of an event.  Then everything trickles down and we
always have events a non-empty list.

Then we needs a list creating stub to place into .enqueue_event for sctp_stream_interleave_1.

Signed-off-by: David S. Miller <davem@...emloft.net>
---
 net/sctp/stream_interleave.c | 49 ++++++++++++++++++++++++++----------
 net/sctp/ulpqueue.c          |  5 ++--
 2 files changed, 39 insertions(+), 15 deletions(-)

diff --git a/net/sctp/stream_interleave.c b/net/sctp/stream_interleave.c
index b6b251b8b3cf..de436ba43186 100644
--- a/net/sctp/stream_interleave.c
+++ b/net/sctp/stream_interleave.c
@@ -484,14 +484,15 @@ static struct sctp_ulpevent *sctp_intl_order(struct sctp_ulpq *ulpq,
 }
 
 static int sctp_enqueue_event(struct sctp_ulpq *ulpq,
-			      struct sctp_ulpevent *event)
+			      struct sk_buff_head *skb_list)
 {
-	struct sk_buff *skb = sctp_event2skb(event);
 	struct sock *sk = ulpq->asoc->base.sk;
 	struct sctp_sock *sp = sctp_sk(sk);
-	struct sk_buff_head *skb_list;
+	struct sctp_ulpevent *event;
+	struct sk_buff *skb;
 
-	skb_list = (struct sk_buff_head *)skb->prev;
+	skb = __skb_peek(skb_list);
+	event = sctp_skb2event(skb);
 
 	if (sk->sk_shutdown & RCV_SHUTDOWN &&
 	    (sk->sk_shutdown & SEND_SHUTDOWN ||
@@ -858,19 +859,24 @@ static int sctp_ulpevent_idata(struct sctp_ulpq *ulpq,
 
 	if (!(event->msg_flags & SCTP_DATA_UNORDERED)) {
 		event = sctp_intl_reasm(ulpq, event);
-		if (event && event->msg_flags & MSG_EOR) {
+		if (event) {
 			skb_queue_head_init(&temp);
 			__skb_queue_tail(&temp, sctp_event2skb(event));
 
-			event = sctp_intl_order(ulpq, event);
+			if (event->msg_flags & MSG_EOR)
+				event = sctp_intl_order(ulpq, event);
 		}
 	} else {
 		event = sctp_intl_reasm_uo(ulpq, event);
+		if (event) {
+			skb_queue_head_init(&temp);
+			__skb_queue_tail(&temp, sctp_event2skb(event));
+		}
 	}
 
 	if (event) {
 		event_eor = (event->msg_flags & MSG_EOR) ? 1 : 0;
-		sctp_enqueue_event(ulpq, event);
+		sctp_enqueue_event(ulpq, &temp);
 	}
 
 	return event_eor;
@@ -944,20 +950,27 @@ static struct sctp_ulpevent *sctp_intl_retrieve_first(struct sctp_ulpq *ulpq)
 static void sctp_intl_start_pd(struct sctp_ulpq *ulpq, gfp_t gfp)
 {
 	struct sctp_ulpevent *event;
+	struct sk_buff_head temp;
 
 	if (!skb_queue_empty(&ulpq->reasm)) {
 		do {
 			event = sctp_intl_retrieve_first(ulpq);
-			if (event)
-				sctp_enqueue_event(ulpq, event);
+			if (event) {
+				skb_queue_head_init(&temp);
+				__skb_queue_tail(&temp, sctp_event2skb(event));
+				sctp_enqueue_event(ulpq, &temp);
+			}
 		} while (event);
 	}
 
 	if (!skb_queue_empty(&ulpq->reasm_uo)) {
 		do {
 			event = sctp_intl_retrieve_first_uo(ulpq);
-			if (event)
-				sctp_enqueue_event(ulpq, event);
+			if (event) {
+				skb_queue_head_init(&temp);
+				__skb_queue_tail(&temp, sctp_event2skb(event));
+				sctp_enqueue_event(ulpq, &temp);
+			}
 		} while (event);
 	}
 }
@@ -1059,7 +1072,7 @@ static void sctp_intl_reap_ordered(struct sctp_ulpq *ulpq, __u16 sid)
 
 	if (event) {
 		sctp_intl_retrieve_ordered(ulpq, event);
-		sctp_enqueue_event(ulpq, event);
+		sctp_enqueue_event(ulpq, &temp);
 	}
 }
 
@@ -1326,6 +1339,16 @@ static struct sctp_stream_interleave sctp_stream_interleave_0 = {
 	.handle_ftsn		= sctp_handle_fwdtsn,
 };
 
+static int do_sctp_enqueue_event(struct sctp_ulpq *ulpq,
+				 struct sctp_ulpevent *event)
+{
+	struct sk_buff_head temp;
+
+	skb_queue_head_init(&temp);
+	__skb_queue_tail(&temp, sctp_event2skb(event));
+	return sctp_enqueue_event(ulpq, &temp);
+}
+
 static struct sctp_stream_interleave sctp_stream_interleave_1 = {
 	.data_chunk_len		= sizeof(struct sctp_idata_chunk),
 	.ftsn_chunk_len		= sizeof(struct sctp_ifwdtsn_chunk),
@@ -1334,7 +1357,7 @@ static struct sctp_stream_interleave sctp_stream_interleave_1 = {
 	.assign_number		= sctp_chunk_assign_mid,
 	.validate_data		= sctp_validate_idata,
 	.ulpevent_data		= sctp_ulpevent_idata,
-	.enqueue_event		= sctp_enqueue_event,
+	.enqueue_event		= do_sctp_enqueue_event,
 	.renege_events		= sctp_renege_events,
 	.start_pd		= sctp_intl_start_pd,
 	.abort_pd		= sctp_intl_abort_pd,
diff --git a/net/sctp/ulpqueue.c b/net/sctp/ulpqueue.c
index b22f558adc49..a698f1a509bf 100644
--- a/net/sctp/ulpqueue.c
+++ b/net/sctp/ulpqueue.c
@@ -116,12 +116,13 @@ int sctp_ulpq_tail_data(struct sctp_ulpq *ulpq, struct sctp_chunk *chunk,
 	event = sctp_ulpq_reasm(ulpq, event);
 
 	/* Do ordering if needed.  */
-	if ((event) && (event->msg_flags & MSG_EOR)) {
+	if (event) {
 		/* Create a temporary list to collect chunks on.  */
 		skb_queue_head_init(&temp);
 		__skb_queue_tail(&temp, sctp_event2skb(event));
 
-		event = sctp_ulpq_order(ulpq, event);
+		if (event->msg_flags & MSG_EOR)
+			event = sctp_ulpq_order(ulpq, event);
 	}
 
 	/* Send event to the ULP.  'event' is the sctp_ulpevent for
-- 
2.20.1

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