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[SCTP]: Flush fragment queue when exiting partial delivery.

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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>
This commit is contained in:
Vlad Yasevich 2007-12-16 14:05:45 -08:00 committed by David S. Miller
parent 215f7b08f2
commit ef5d4cf2f9
1 changed files with 33 additions and 0 deletions
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33
net/sctp/ulpqueue.c
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@ -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.
*/