[Bug 204593] Add a sysctl to enable display of IPv4 ICMP handling in the kernel

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=204593

Andrey V. Elsukov <ae at FreeBSD.org> changed:

           What    |Removed                     |Added
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                 CC|                            |ae at FreeBSD.org

--- Comment #1 from Andrey V. Elsukov <ae at FreeBSD.org> ---
(In reply to Hellmuth Michaelis from comment #0)
> Currently it only possible to follow IPv4 ICMP handling in/of the kernel by
> recompiling the kernel and adding a define for "ICMPPRINTFS" to enable
> kernel console messages for ICMP handling in /usr/src/sys/netinet/ip_icmp.c.

You can get the most of these printfs using dtrace fbt probes.
To get more, I prefer add ICMP_PROBE() dtrace probe, similar to that we have
for IP, UDP and TCP.

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