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tipc: disallow packet duplicates in link deferred queue

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After the previous commits, we are guaranteed that no packets
of type LINK_PROTOCOL or with illegal sequence numbers will be
attempted added to the link deferred queue. This makes it possible to
make some simplifications to the sorting algorithm in the function
tipc_skb_queue_sorted().

We also alter the function so that it will drop packets if one with
the same seqeunce number is already present in the queue. This is
necessary because we have identified weird packet sequences, involving
duplicate packets, where a legitimate in-sequence packet may advance to
the head of the queue without being detected and de-queued.

Finally, we make this function outline, since it will now be called only
in exceptional cases.

Signed-off-by: Jon Maloy <jon.maloy@ericsson.com>
Acked-by: Ying Xue <ying.xue@windriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jon Paul Maloy
2015-10-15 14:52:43 -04:00
committed by David S. Miller
parent 81204c492b
commit 8306f99a51
3 changed files with 34 additions and 33 deletions
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2
net/tipc/link.c
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@@ -1114,7 +1114,7 @@ int tipc_link_rcv(struct tipc_link *l, struct sk_buff *skb,
/* Defer delivery if sequence gap */
if (unlikely(seqno != rcv_nxt)) {
__tipc_skb_queue_sorted(defq, skb);
__tipc_skb_queue_sorted(defq, seqno, skb);
tipc_link_build_nack_msg(l, xmitq);
break;
}