tree 909ed75c500d0ac422738781f84a819c933703c5
parent 57cca05af1e20fdc65b55be52c042c234f86c866
author Herbert Xu <herbert@gondor.apana.org.au> 1134544597 -0800
committer David S. Miller <davem@sunset.davemloft.net> 1136322641 -0800

[IP]: Simplify and consolidate MSG_PEEK error handling

When a packet is obtained from skb_recv_datagram with MSG_PEEK enabled
it is left on the socket receive queue.  This means that when we detect
a checksum error we have to be careful when trying to free the packet
as someone could have dequeued it in the time being.

Currently this delicate logic is duplicated three times between UDPv4,
UDPv6 and RAWv6.  This patch moves them into a one place and simplifies
the code somewhat.

This is based on a suggestion by Eric Dumazet.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>