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authorVlad Yasevich <vladislav.yasevich@hp.com>2007-12-16 14:05:45 -0800
committerDavid S. Miller <davem@davemloft.net>2007-12-16 14:05:45 -0800
commitef5d4cf2f9aae4e09883d2d664e367a16b47d857 (patch)
treeb6e83cf4f8b975c8bec0045c8a74d11496524f10 /net/sctp/ulpqueue.c
parent215f7b08f2a142ec19f4bd3d6de263e68b877955 (diff)
[SCTP]: Flush fragment queue when exiting partial delivery.
At the end of partial delivery, we may have complete messages sitting on the fragment queue. These messages are stuck there until a new fragment arrives. This can comletely stall a given association. When clearing partial delivery state, flush any complete messages from the fragment queue and send them on their way up. Signed-off-by: Vlad Yasevich <vladislav.yasevich@hp.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/sctp/ulpqueue.c')
-rw-r--r--net/sctp/ulpqueue.c33
1 files changed, 33 insertions, 0 deletions
diff --git a/net/sctp/ulpqueue.c b/net/sctp/ulpqueue.c
index 4908041ffb3..1733fa29a50 100644
--- a/net/sctp/ulpqueue.c
+++ b/net/sctp/ulpqueue.c
@@ -53,6 +53,7 @@ static struct sctp_ulpevent * sctp_ulpq_reasm(struct sctp_ulpq *ulpq,
struct sctp_ulpevent *);
static struct sctp_ulpevent * sctp_ulpq_order(struct sctp_ulpq *,
struct sctp_ulpevent *);
+static void sctp_ulpq_reasm_drain(struct sctp_ulpq *ulpq);
/* 1st Level Abstractions */
@@ -190,6 +191,7 @@ static void sctp_ulpq_set_pd(struct sctp_ulpq *ulpq)
static int sctp_ulpq_clear_pd(struct sctp_ulpq *ulpq)
{
ulpq->pd_mode = 0;
+ sctp_ulpq_reasm_drain(ulpq);
return sctp_clear_pd(ulpq->asoc->base.sk, ulpq->asoc);
}
@@ -699,6 +701,37 @@ void sctp_ulpq_reasm_flushtsn(struct sctp_ulpq *ulpq, __u32 fwd_tsn)
}
}
+/*
+ * Drain the reassembly queue. If we just cleared parted delivery, it
+ * is possible that the reassembly queue will contain already reassembled
+ * messages. Retrieve any such messages and give them to the user.
+ */
+static void sctp_ulpq_reasm_drain(struct sctp_ulpq *ulpq)
+{
+ struct sctp_ulpevent *event = NULL;
+ struct sk_buff_head temp;
+
+ if (skb_queue_empty(&ulpq->reasm))
+ return;
+
+ while ((event = sctp_ulpq_retrieve_reassembled(ulpq)) != NULL) {
+ /* Do ordering if needed. */
+ if ((event) && (event->msg_flags & MSG_EOR)){
+ skb_queue_head_init(&temp);
+ __skb_queue_tail(&temp, sctp_event2skb(event));
+
+ event = sctp_ulpq_order(ulpq, event);
+ }
+
+ /* Send event to the ULP. 'event' is the
+ * sctp_ulpevent for very first SKB on the temp' list.
+ */
+ if (event)
+ sctp_ulpq_tail_event(ulpq, event);
+ }
+}
+
+
/* Helper function to gather skbs that have possibly become
* ordered by an an incoming chunk.
*/