IO::Socket->sockopt is used to retrieve a socket option.

In the new 2.4 Linux, there is a new socket option in the netfilter code, called SO_ORIGINAL_DST. We use this to find the original socket destination once the socket has gone through the NAT code. netfilter_ipv4.h defines that value as SO_ORIGINAL_DST = 80.

If I try $socket->sockopt(80), I get $! = "Protocol not available". So I tried to modify Socket-1.5, and added a simple entry for SO_ORIGINAL_DST, but I then got: 
Your vendor has not defined Socket macro SO_ORIGINAL_DST, used at ./pr
+oxy.pl line 14

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How do I add this new socket option so that both IO::Socket and perl recognize it as valid and return the right value ?

Originally posted as a Categorized Question.

In reply to How do I *add* a socket option ? by Q-Bert

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