I'm not sure why it's using rt_src here, but there are relevant cases that
your description doesn't cover. For example, what happens if the source
is not set in the original packet? Does NAT affect this?
You quote RFC text for ICMP echo and the case where the receiving machine
is the final destination, but you're modifying code that is used for all
ICMP
types and used for ICMP errors generated when acting as an intermediate
router.
In ordinary cases, and certainly with ICMP echo when the source is set in
the original packet and no rewriting is going on (and the address is not
spoofed),
using the original source as the destination is fine. But have you tested
or
considered the other cases?
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