icmp echo disable (or dont answer pings)

[Steven Johnson]

Hi,

I've posted this before, but it seems to have been missed, because it
was in a message with other info.

We need to be able to prevent all ping's being echoed in my application,
it's an end user security requirement.

I've added a feature to the network stack to allow this to be toggled by
the application (using a sysctl).  Patch is attached for comments.

This patch is against 4.6.99.3

Steven J
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