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: [email protected]
Reporter: [email protected]
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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