[Bug 194758] New: Need an API to obtain original destination port of locally forwarded UDP packet

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=194758

            Bug ID: 194758
           Summary: Need an API to obtain original destination port of
                    locally forwarded UDP packet
           Product: Base System
           Version: 10.0-RELEASE
          Hardware: Any
                OS: Any
            Status: Needs Triage
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: hoomanfazaeli at gmail.com

For UDP packets forwarded to a local daemon with a rule like below:

ipfw add 10 fwd localhost,7000 udp from any to any in recv em1

The daemon may obtain the original destination address of forwarded packets
using recvmsg(2) and IP_RECVDSTADDR socket option. However, there is no
API to obtain the original destination _port_.

One possible solution is to add a new socket option, say IP_RECVDSTSOADDR.
If set on a datagram socket, ip_savecontorl/ip6_savecontrol_v4 would record 
the datagram's destination address and port as a 'sockaddr_in[6]' structure.

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