Ping implements netstack.GICMPHandler. Takes ownership of msg. Nb: to send icmp pings, root access is required; and so, send "unprivileged" icmp pings via udp reqs; which do work on Vanilla Android, because ping_group_range is set to 0 2147483647 ref: cs.android.com/android/platform/superproject/+/m
(msg []byte, source, target netip.AddrPort)
source not stored for this graph (policy: none)
nothing calls this directly
no test coverage detected