sctp: add support for the process of unordered idata

Unordered idata process is more complicated than unordered data:

 - It has to add mid into sctp_stream_out to save the next mid value,
   which is separated from ordered idata's.

 - To support pd for unordered idata, another mid and pd_mode need to
   be added to save the message id and pd state in sctp_stream_in.

 - To make  unordered idata reasm easier, it adds a new event queue
   to save frags for idata.

The patch mostly adds the samilar reasm functions for unordered idata
as ordered idata's, and also adjusts some other codes on assign_mid,
abort_pd and ulpevent_data for idata.

Signed-off-by: Xin Long <lucien.xin@gmail.com>
Acked-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Acked-by: Neil Horman <nhorman@tuxdriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 5 insertions, 0 deletions

diff --git a/net/sctp/ulpqueue.c b/net/sctp/ulpqueue.c
index dd53daab4a25..97fae53310e0 100644
--- a/net/sctp/ulpqueue.c
+++ b/net/sctp/ulpqueue.c
@@ -60,6 +60,7 @@ struct sctp_ulpq *sctp_ulpq_init(struct sctp_ulpq *ulpq,
 
         ulpq->asoc = asoc;
         skb_queue_head_init(&ulpq->reasm);
+        skb_queue_head_init(&ulpq->reasm_uo);
         skb_queue_head_init(&ulpq->lobby);
         ulpq->pd_mode  = 0;
 
@@ -83,6 +84,10 @@ void sctp_ulpq_flush(struct sctp_ulpq *ulpq)
                 sctp_ulpevent_free(event);
         }
 
+        while ((skb = __skb_dequeue(&ulpq->reasm_uo)) != NULL) {
+                event = sctp_skb2event(skb);
+                sctp_ulpevent_free(event);
+        }
 }
 
 /* Dispose of a ulpqueue.  */