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27 March 2024, 02:37:15 UTC
Revision beb39db59d14990e401e235faf66a6b9b31240b0 authored by Eric Dumazet on 30 May 2015, 16:16:53 UTC, committed by David S. Miller on 01 June 2015, 04:42:18 UTC 
udp: fix behavior of wrong checksums
 
We have two problems in UDP stack related to bogus checksums :

1) We return -EAGAIN to application even if receive queue is not empty.
   This breaks applications using edge trigger epoll()

2) Under UDP flood, we can loop forever without yielding to other
   processes, potentially hanging the host, especially on non SMP.

This patch is an attempt to make things better.

We might in the future add extra support for rt applications
wanting to better control time spent doing a recv() in a hostile
environment. For example we could validate checksums before queuing
packets in socket receive queue.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Willem de Bruijn <willemb@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
1 parent 9eb0a5d
History
Tip revision: beb39db59d14990e401e235faf66a6b9b31240b0 authored by Eric Dumazet on 30 May 2015, 16:16:53 UTC
udp: fix behavior of wrong checksums
Tip revision: beb39db
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